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 image side surface of the sixth lens is a concave surface; and the object side surface of the seventh lens is a convex surface near the optical axis, 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 rapidly spread in modern video conferences. With the miniaturization of various electronic devices, the demand for miniaturization of optical lenses installed in electronic devices is becoming increasingly intense. However, traditional optical lenses used in video conferences often have a large volume and can no longer meet the requirements of miniaturization of electronic devices. Moreover, the imaging quality of traditional optical lenses is poor, especially the quality of images and videos taken in dim environments is poor, which cannot meet the requirements of high-definition imaging in video conferences. How to make the imaging lens for video conferences take into account miniaturization and high image quality has become a difficult problem to be solved urgently at present. Summary of the Invention

[0003] Aiming at 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 successively 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 image side surface of which is concave; A seventh lens with a positive optical power, the object side surface of which is convex near the optical axis and the image side surface of which is concave near the optical axis; Wherein, the combined focal length f12 of the first lens and the second lens and the combined focal length f37 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 4 < f12 / f37 < 6.5.

[0005] Further preferably, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 1.1 < TTL / IH < 1.3.

[0006] Further preferably, the total optical length TTL of the optical lens, the maximum field of view FOV of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 3.5 < (TTL × tan(FOV / 2)) / (IH / 2) < 3.8.

[0007] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f3 / f < 0.9.

[0008] Further preferably, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: 5.4 < f12 / f < 8.2.

[0009] Further preferably, the curvature radius R1 of the object side surface of the first lens and the sagitta SAGX11 corresponding to the maximum clear aperture radius at the object side end of the first lens satisfy: 2.3 < R1 / SAGX11 < 3.

[0010] Further preferably, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the distance CT12 between the first lens and the second lens on the optical axis, and the distance CT23 between the second lens and the third lens on the optical axis satisfy: 1.4 < (CT1 + CT2 + CT3) / (CT12 + CT23) < 1.7.

[0011] Further preferably, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 4.8 < (R1 + R2) / (R1 - R2) < 6.2.

[0012] Further preferably, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 5.5 < (R3 + R4) / (R3 - R4) < 6.2.

[0013] Further preferably, the focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: -5.7 < f1 / (R1 + R2) < -4.

[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 matched with a large target surface chip, which is beneficial to improving the lens resolution and the detail restoration degree of the image; it enables the lens to 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. 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 description of the embodiments in conjunction with the following drawings, wherein: Figure 1 FIG. is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0016] Figure 2 FIG. is an astigmatism curve diagram of the optical lens in Embodiment 1 of the present invention.

[0017] Figure 3 FIG. is an axial aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

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

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

[0020] Figure 6 FIG. is an astigmatism curve diagram of the optical lens in Embodiment 2 of the present invention.

[0021] Figure 7 FIG. is an axial aberration curve diagram of the optical lens in Embodiment 2 of the present invention.

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

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

[0024] Figure 10 FIG. is an astigmatism curve diagram of the optical lens in Embodiment 3 of the present invention.

[0025] Figure 11 FIG. is an axial aberration curve diagram of the optical lens in Embodiment 3 of the present invention.

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

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

[0028] Figure 14 FIG. is an astigmatism curve diagram of the optical lens in Embodiment 4 of the present invention.

[0029] Figure 15 FIG. is an axial aberration curve diagram of the optical lens in Embodiment 4 of the present invention.

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

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

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

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

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

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

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

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

[0038] Figure 24 This is the lateral chromatic aberration curve graph 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, 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 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 features. 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 clarity, the thickness, dimensions, and shapes of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0043] In this text, 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 to be 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 "comprising", "comprising of", "having", "containing" and / or "containing of", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when 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 an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used in this text shall have the same meaning as commonly understood by those 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) shall 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 in this text.

[0046] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will detail this application with reference to the drawings and in combination 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 focal power, with its object side being convex and its image side being concave. The second lens may have a positive focal power, with its object side being concave and its image side being convex. The third lens may have a positive focal power, with its object side being convex and its image side being convex. The fourth lens may have a negative focal power, with its object side being either concave or convex and its image side being either concave or convex. The fifth lens may have a positive focal power, with its object side being either concave or convex and its image side being either concave or convex. The sixth lens may have a negative focal power, with its object side being either concave or convex and its image side being concave. The seventh lens may have a positive focal power, with its object side being convex near the optical axis and its image side being concave near the optical axis.

[0049] In some embodiments, the optical lens may further include a diaphragm, which 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, which may be disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0051] In some embodiments, the combined focal length f12 of the first lens and the second lens and the combined focal length f37 of the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens satisfy: 4 < f12 / f37 < 6.5. Meeting the above conditional formula is beneficial to ensuring that a large-angle light beam passes through the first lens and the second lens and enters the diaphragm, beneficial to reducing the aberration of the edge field of view, improving the imaging quality, enabling the optical lens to have a certain large field of view angle, and enhancing the image plane brightness of the optical lens; at the same time, it is beneficial to controlling the height of the outgoing light beam of the optical lens to reduce the aberration of the optical lens and the outer diameter of each lens, meeting the requirements of miniaturized design.

[0052] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 1.1 < TTL / IH < 1.3. Meeting the above conditional formula and reasonably configuring the overall optical length of the optical lens and the true image height corresponding to the maximum field of view angle can effectively shorten the overall optical length of the optical lens while ensuring that the optical lens has a high pixel count, enabling the optical lens to meet the requirements of miniaturization while having a high imaging quality.

[0053] In some embodiments, the total optical length TTL of the optical lens, the maximum field of view FOV of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 3.5 < (TTL × tan(FOV / 2)) / (IH / 2) < 3.8. Satisfying the above conditional formula can effectively balance the requirements of the image height and the total optical length of the optical lens, effectively limit the length of the optical lens, and facilitate the miniaturization of the optical lens; at the same time, by controlling the maximum field of view of the optical lens and the true image height corresponding to the maximum field of view, the optical distortion of the optical lens can be controlled, and the overall resolution can be improved.

[0054] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.7 < f3 / f < 0.9. Satisfying the above conditional formula, by setting the third lens with a positive optical power and defining the ratio of the focal length of the third lens to the effective focal length of the optical lens, it is beneficial to adjust the light path from the first lens and the second lens, so that the optical lens has the characteristics of a certain large field of view, low sensitivity, and miniaturization.

[0055] In some embodiments, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: 5.4 < f12 / f < 8.2. Satisfying the above conditional formula, the combined focal length of the first lens and the second lens is controlled within a reasonable range, which is beneficial to ensuring that the optical lens meets a certain field of view and has a long focal length characteristic; at the same time, it can also prevent the incident light beam from being greatly deflected, reduce the aberration generated by the first lens and the second lens, improve the imaging resolution of the optical lens, and thus obtain high-quality imaging.

[0056] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the sagitta SAGX11 corresponding to the maximum clear aperture at the object side end of the first lens satisfy: 2.3 < R1 / SAGX11 < 3. Satisfying the above conditional formula can control the ratio relationship between the curvature radius of the object side surface of the first lens and the sagitta at the maximum effective aperture, provide a negative refractive power for the optical lens, so as to capture the light rays entering the optical lens at large angles and expand the field of view range of the optical lens.

[0057] In some embodiments, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the distance CT12 between the first lens and the second lens on the optical axis, and the distance CT23 between the second lens and the third lens on the optical axis satisfy: 1.4 < (CT1 + CT2 + CT3) / (CT12 + CT23) < 1.7. Satisfying the above conditional formula can effectively control the deflection of the marginal large field of view light rays, improve the relative illumination of the optical lens, and can also effectively control the reasonable distribution of the first three lenses in space, ensure that the optical lens has better assemblability, and improve the production yield.

[0058] In some embodiments, 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: 4.8 < (R1 + R2) / (R1 - R2) < 6.2. By satisfying the above conditional formula, by reasonably defining the shapes of the object side surface and the image side surface of the first lens, the distortion generated by the first lens can be reduced, the difficulty of distortion correction of subsequent lenses can be reduced, and it helps to improve the imaging quality.

[0059] In some embodiments, 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: 5.5 < (R3 + R4) / (R3 - R4) < 6.2. By satisfying the above conditional formula, the object side surface and the image side surface of the second lens can be made close to a concentric circle structure, the ability of the second lens to converge light can be reduced, and the function of smoothly transitioning light can be achieved.

[0060] In some embodiments, the focal length f1 of the first lens, 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: -5.7 < f1 / (R1 + R2) < -4. By satisfying the above conditional formula, the surface shapes of the object side surface and the image side surface of the first lens can be constrained, which is beneficial to reducing the bending degree of light at the image side surface of the first lens, 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 while the optical lens has a large field of view, the astigmatism is not too large, and thus the excellent imaging quality of the optical lens is ensured.

[0061] In some embodiments, the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 50° ≤ FOV / Fno ≤ 58°. By satisfying the above conditional formula, it can ensure that the optical lens meets a certain large field of view angle, reduce the influence of off-axis aberration on the system, and at the same time ensure the improvement of the imaging surface brightness, thereby improving the imaging quality.

[0062] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.9 < IH / f < 2.2. By satisfying the above conditional formula, the imaging quality and miniaturization requirements of the optical lens are ensured.

[0063] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -6 < f4 / f < -1. By satisfying the above conditional formula, as the intermediate 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 that it can be used to correct the chromatic aberration of the optical lens, and at the same time 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.

[0064] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -2.5 < f6 / f < -1.5. By satisfying the above conditional formula, the sixth lens is set as a negative lens, thereby providing a negative refractive power for the optical lens, which is beneficial to correcting the aberration of the optical lens and improving the imaging quality of the optical lens.

[0065] In some embodiments, the clear aperture semi-diameter CSD11 at the object side end of the first lens and the clear aperture semi-diameter CSD71 at the object side end of the seventh lens satisfy: 0.9 < CSD11 / CSD71 < 1.2. By satisfying the above conditional formula, the optical lens can have a smaller aperture size, which is convenient for being mounted on a thin and light electronic device; at the same time, it ensures that the optical lens can collect light at a large angle, realize imaging with a large field of view angle of the optical lens, increase the imaging area of the optical lens, and improve the imaging quality.

[0066] In some embodiments, the central thickness CT1 of the first lens on the optical axis and the edge thickness ET1 of the first lens satisfy: 0.85 < CT1 / ET1 < 1.1. By satisfying the above conditional formula, by controlling the central thickness and the edge thickness of the first lens within a certain range, the aberration generated by the optical lens can be effectively balanced, and at the same time, it is also beneficial to the field curvature adjustment in engineering production, which is further beneficial to improving the imaging quality of the optical lens.

[0067] In some embodiments, the optical lens satisfies the conditional formula: 11.5 mm < TTL < 12.5 mm; 4.6 mm < f < 5.1 mm; 110° < FOV < 130°; 2.2 mm < EPD < 2.5 mm; 1.9 < Fno < 2.3; 9.5 mm < IH < 11 mm; 2 mm < CSD11 < 3.8 mm; 2 mm < CSD12 < 3 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 semi-diameter at the object side end of the first lens, and CSD12 represents the clear aperture semi-diameter at the image side end of the first lens. By satisfying the above conditions, it shows that the optical lens provided by the embodiments of the present invention has at least one or more advantages among miniaturization, large aperture, small aperture, large field of view angle, high pixel, and large image height characteristics.

[0068] 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 makes the structure of the lens relatively compact, and can better achieve the balance between the miniaturization of the lens and high image quality.

[0069] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better 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.

[0070] 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 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, H are the coefficients of the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order curved surfaces respectively.

[0071] 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 somewhat different. For specific differences, please refer to the parameter tables of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any 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 all included in the protection scope of the present invention.

[0072] Embodiment 1 Please refer to Figure 1 , which shows a schematic structural diagram of the 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.

[0073] Among them, the first lens L1 has a negative optical power, its object side S1 is convex, and its image side S2 is concave; The second lens L2 has a positive optical power, its object side S3 is concave, and its image side S4 is convex; The third lens L3 has a positive optical power, its object side S5 is convex, and its image side S6 is convex; The fourth lens L4 has a negative optical power, its object side S7 is convex near the optical axis, and its image side S8 is concave; The fifth lens L5 has a positive optical power, its object side S9 is concave, and its image side S10 is convex near the optical axis; The sixth lens L6 has a negative optical power, its object side S11 is convex, and its image side S12 is concave; The seventh lens L7 has a positive optical 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.

[0074] 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.

[0075] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0076] 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.

[0077] 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.

[0078] Figure 2 The astigmatism curve graph of Embodiment 1 is shown, 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.

[0079] Figure 3The axial aberration curve of Embodiment 1 is shown, which represents the aberration on the optical axis at the imaging plane for each wavelength. 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 ±0.02 mm, indicating that the optical lens 100 can correct the axial aberration well.

[0080] Figure 4 The lateral chromatic aberration curve of Embodiment 1 is shown, which represents the chromatic aberration at different image heights on the imaging plane for each wavelength relative to the central wavelength (0.555 μm). The horizontal axis represents the lateral chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the field angle. It can be seen from the figure that the lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within -1 μm to 2 μm, indicating that the optical lens 100 can correct the chromatic aberration of each field extremely well.

[0081] 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 a concave surface; the image side surface S8 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0082] The relevant parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0083] 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.

[0084] Table 2-2 In this embodiment, the astigmatism curve, axial aberration curve, and lateral chromatic aberration curve of the optical lens 200 are respectively as shown in Figure 6 , Figure 7 , Figure 8 .

[0085] It can be seen from Figure 6 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 correct the astigmatism well.

[0086] It can be seen from Figure 7 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.

[0087] It can be seen from Figure 8It can be seen that the vertical chromatic aberration between 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.

[0088] 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 object side surface S11 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0089] The relevant parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0090] 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.

[0091] Table 3-2 In this embodiment, the astigmatism curve diagram, axial aberration curve diagram, and vertical chromatic aberration curve diagram of the optical lens 300 are respectively as Figure 10 , Figure 11 , Figure 12 shown.

[0092] 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 to 0.3 mm, indicating that the optical lens 300 can well correct astigmatism.

[0093] From Figure 11 it can be seen that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 300 can preferably correct the axial aberration.

[0094] From Figure 12 it can be seen that the vertical chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 300 can excellently correct the chromatic aberration of each field of view.

[0095] 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 optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0096] The relevant parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0097] 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.

[0098] 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.

[0099] 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 well correct astigmatism.

[0100] 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 better correct the axial aberration.

[0101] 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 excellently correct the chromatic aberration of each field of view.

[0102] 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: 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 S11 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0103] The relevant parameters of each lens in the optical lens 500 in Embodiment 5 are shown in Table 5-1.

[0104] 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.

[0105] 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 follows Figure 18 , Figure 19 , Figure 20 shown.

[0106] From Figure 18 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 500 can well correct astigmatism.

[0107] 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 better correct the axial aberration.

[0108] 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 excellently correct the chromatic aberration of each field of view.

[0109] Embodiment 6 Please refer to Figure 21 , which shows the structural schematic diagram of the optical lens 600 provided in Embodiment 6 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 object side surface S9 of the fifth lens L5 is convex; the object side surface S11 of the sixth lens L6 is concave; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0110] The relevant parameters of each lens in the optical lens 600 in Embodiment 6 are shown in Table 6-1.

[0111] Table 6-1 The surface type parameters of the aspherical lens of the optical lens 600 in Embodiment 6 are shown in Table 6-2.

[0112] 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 follows Figure 22 , Figure 23 , Figure 24 shown.

[0113] From Figure 22 it can be seen that the astigmatism between the meridional image plane and the sagittal image plane is controlled within ±0.2 mm, indicating that the optical lens 600 can well correct astigmatism.

[0114] From Figure 23As can be seen, the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 600 can correct the axial aberration well.

[0115] As can be seen from Figure 24 it that the lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±3 μm, indicating that the optical lens 600 can excellently correct the chromatic aberration of each field of view.

[0116] Please refer to Table 7 for the optical characteristics corresponding to the above embodiments, including the effective focal length f, 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 expression in each embodiment.

[0117] 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 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.

[0118] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present 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.

[0119] The above-described 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 element having negative optical power, whose image side surface is concave; The seventh lens element has positive refractive power, and its object side surface is convex at the near optical axis, and its image side surface is concave at the near optical axis; The combined focal length f12 of the first lens and the second lens and the combined focal length f37 of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy the following: <f12 / f37<6.5。 2. The optical lens according to claim 1, characterized in that: The total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.1 <TTL / IH<1.3。 3. The optical lens according to claim 1, characterized in that: The total optical length TTL of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 3.5<(TTL×tan(FOV / 2)) / (IH / 2)<3.

8.

4. The optical lens according to claim 1, characterized in that: The focal length f3 of the third lens satisfies the effective focal length f of the optical lens: 0.7 <f3 / f<0.9。 5. The optical lens according to claim 1, characterized in that: The combined focal length f12 of the first lens and the second lens satisfies the effective focal length f of the optical lens: 5.4 <f12 / f<8.2。 6. The optical lens according to claim 1, characterized in that: The radius of curvature R1 of the object side of the first lens and the vector height SAGX11 corresponding to the maximum light semi-aperture of the object side end of the first lens satisfy: 2.3 <R1 / SAGX11<3。 7. The optical lens according to claim 1, characterized in that: The center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the distance CT12 between the first lens and the second lens on the optical axis, and the distance CT23 between the second lens and the third lens on the optical axis satisfy: 1.4<(CT1+CT2+CT3) / (CT12+CT23)<1.

7.

8. The optical lens according to claim 1, characterized in that: A curvature radius R1 of the object side surface of the first lens and a curvature radius R2 of the image side surface of the first lens satisfy: 4.8<(R1+R2) / (R1-R2)<6.

2.

9. The optical lens according to claim 1, characterized in that: A curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 5.5<(R3+R4) / (R3-R4)<6.

2.

10. The optical lens according to claim 1, characterized in that: The focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: -5.7 <f1 / (R1+R2)<-4。

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