Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative optical power, wherein the object side surface of the second lens is a concave surface near the optical axis, and the image side surface of the second lens is a concave surface; a third lens with negative optical power, wherein the object side surface and the image side surface of the third lens are both concave surfaces; a fourth lens with positive optical power, wherein the object side surface and the image side surface of the fourth lens are both convex surfaces; a fifth lens with negative optical power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; a sixth lens with positive optical power, wherein the object side surface and the image side surface of the sixth lens are both convex surfaces; and a seventh lens with negative optical power, wherein the image side surface of the seventh lens is a concave surface near the optical axis; and 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 the condition: 0.1<(R3+R4) / (R3‑R4)<0.8. The optical lens provided by the application can improve the imaging quality of the optical lens, reduce aberration and improve the imaging quality of the optical lens.

Description

Technical Field

[0001] This invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Technology

[0002] As the market demands for panoramic camera lenses continue to rise, panoramic lenses are being widely used, and the pursuit of imaging effects for panoramic lenses is becoming more diversified. They require not only high-definition image quality but also a wider field of view to record more information. These factors have led to wider-angle high-definition imaging lenses receiving more attention.

[0003] Wide-angle lenses generally suffer from significant distortion, resulting in poor edge imaging. Furthermore, their shorter effective focal length leads to substantial compression and distortion of peripheral light. While wide-angle lenses offer a unique perspective and a sense of immersion, they severely distort backgrounds with varying angles. Therefore, overcoming the distortion inherent in wide-angle lenses remains a challenge. Chip development has also diverged in two directions: one is large-area chips, which offer high light throughput and are well-suited for high-quality image processing. Under the same lighting conditions, they capture more light information, resulting in better image quality and allowing for greater post-processing. However, this comes at the cost of larger product size and weight. The other direction is chip miniaturization, which lowers cost but results in lower image clarity. The technical challenge lies in enabling wide-angle lenses to possess the advantages of a wide angle and low distortion, while also being compatible with large-area imaging chips to achieve high-definition imaging. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an optical lens with the advantage of excellent image quality.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An optical lens comprises seven lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0007] The first lens with negative optical power has a convex object side and a concave image side.

[0008] A second lens with negative optical power has an object-side surface that is concave near the optical axis and an image-side surface that is concave.

[0009] A third lens with negative optical power has concave object-side and image-side surfaces;

[0010] The fourth lens with positive optical power has convex surfaces on both its object side and image side.

[0011] The fifth lens with negative optical power has a convex object side and a concave image side.

[0012] The sixth lens with positive optical power, both its object side and image side are convex;

[0013] The seventh lens with negative optical power, its image side is concave near the optical axis;

[0014] Wherein, the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 0.1 < (R3 + R4) / (R3 - R4) < 0.8.

[0015] Further preferably, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.7 < TTL / IH < 3.4.

[0016] Further preferably, the maximum field angle FOV of the optical lens, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 55° < (FOV × f) / IH < 70°.

[0017] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -18 < f3 / f < -4.5.

[0018] Further preferably, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -6.2 < f7 / f < -2.5.

[0019] Further preferably, the effective focal length f of the optical lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: -1.6 < f123 / f < -0.8; the effective focal length f of the optical lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 1.5 < f4567 / f < 2.3.

[0020] Further preferably, the effective focal length f of the optical lens and the curvature radius R3 of the object side of the second lens satisfy: -9.6 < R3 / f < -4.1; the effective focal length f of the optical lens and the curvature radius R4 of the image side of the second lens satisfy: 2.4 < R4 / f < 3.2.

[0021] Further preferably, the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: -6 < R5 / R6 < -0.8.

[0022] Further preferably, the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 0 < (R9 - R10) / (R9 + R10) < 0.5.

[0023] Further preferably, the sagittal height Sag3 of the object-side clear aperture of the second lens and the object-side clear aperture d3 of the second lens satisfy: 0 < Sag3 / d3 < 0.3; the sagittal height Sag4 of the image-side clear aperture of the second lens and the image-side clear aperture d4 of the second lens satisfy: 0.3 < Sag4 / d4 < 0.6.

[0024] The optical lens provided by the present invention uses seven lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power distributions, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, enabling the lens to have one or more advantages such as an ultra-large field angle, a small volume, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0026] Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 2 is a field curvature curve graph of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 3 is an F-Theta distortion curve graph of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 4 is an axial aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 5 is a lateral chromatic aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 6 is an MTF curve graph of the optical lens in Embodiment 1 of the present invention.

[0032] Figure 7 is a relative illumination curve graph of the optical lens in Embodiment 1 of the present invention.

[0033] Figure 8 is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 9 is a field curvature curve graph of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 10 is an F-Theta distortion curve graph of the optical lens in Embodiment 2 of the present invention.

[0036] Figure 11This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0037] Figure 12 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0038] Figure 13 This is the MTF curve of the optical lens in Embodiment 2 of the present invention.

[0039] Figure 14 This is a relative illumination curve of the optical lens in Embodiment 2 of the present invention.

[0040] Figure 15 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0041] Figure 16 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0042] Figure 17 This is the F-Theta distortion curve of the optical lens in Embodiment 3 of the present invention.

[0043] Figure 18 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0044] Figure 19 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0045] Figure 20 This is an MTF curve of the optical lens in Embodiment 3 of the present invention.

[0046] Figure 21 This is a relative illumination curve of the optical lens in Embodiment 3 of the present invention.

[0047] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0048] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0049] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0050] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0051] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0052] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0053] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] The optical lens of this invention comprises seven lenses, arranged sequentially along the optical axis from the object side to the imaging plane: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens.

[0056] In some embodiments, the first lens may have a negative optical power, with its object side being convex and its image side being concave. The second lens may have a negative optical power, with its object side being concave near the optical axis and its image side being concave. The third lens may have a negative optical power, with both its object side and image side being concave. The fourth lens may have a positive optical power, with both its object side and image side being convex. The fifth lens may have a negative optical power, with its object side being convex and its image side being concave. The sixth lens may have a positive optical power, with both its object side and image side being convex. The seventh lens may have a negative optical power, with its object side being either concave or convex and its image side being concave near the optical axis.

[0057] In some embodiments, the optical lens may further include an aperture, and the aperture may be located between the third lens and the fourth lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the imaging. When the aperture is located between the third lens and the fourth lens, it is convenient for the correction of aperture aberration.

[0058] 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.

[0059] In some embodiments, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: 0.1 < (R3 + R4) / (R3 - R4) < 0.8. Meeting the above range is beneficial to the smooth trend of light rays and reduces the pressure of aberration correction for the rear lenses of the optical lens. More specifically, 0.25 < (R3 + R4) / (R3 - R4) < 0.52.

[0060] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.7 < TTL / IH < 3.4. Meeting the above range is beneficial to achieving the balance between the volume of the optical lens and the image plane. More specifically, 2.94 < TTL / IH < 3.24.

[0061] In some embodiments, the maximum field angle FOV of the optical lens, the effective focal length f of the optical lens, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 55° < (FOV × f) / IH < 70°. Meeting the above range limits the field angle, focal length, and image height of the optical lens within a reasonable range, which helps to balance the large field angle and the image plane and improve the overall structural stability of the lens. More specifically, 59.17° < (FOV × f) / IH < 65.72°.

[0062] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -18 < f3 / f < -4.5. Meeting the above range and defining that the third lens has an appropriate negative optical power helps to share the negative refractive power of the front lens, reduce the generation of higher-order aberrations, and facilitate the subsequent lenses to improve the imaging quality. More specifically, -16.39 < f3 / f < -5.04.

[0063] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -6.2 < f7 / f < -2.5. Meeting the above range can make the seventh lens have a negative optical power, which is beneficial to increasing the imaging area and field angle of the optical lens and improving the imaging quality of the optical lens. More specifically, -5.68 < f7 / f < -2.73.

[0064] In some embodiments, the effective focal length f of the optical lens and the combined focal length f123 of the first, second, and third lenses satisfy: -1.6 < f123 / f < -0.8; the effective focal length f of the optical lens and the combined focal length f4567 of the fourth, fifth, sixth, and seventh lenses satisfy: 1.5 < f4567 / f < 2.3. Meeting the above range, by reasonably setting the focal lengths of the lens groups before and after the aperture, it is beneficial to reduce the spherical aberration and field curvature generated by the front lens group of the optical lens, and at the same time enable the rear lens group to better balance the distortion and astigmatism generated by the front lens group, improving the imaging quality of the optical lens. More specifically, -1.46 < f123 / f < -0.92; 1.64 < f4567 / f < 2.08.

[0065] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: -9.6 < R3 / f < -4.1; the radius of curvature R4 of the image side surface of the second lens and the effective focal length f of the optical lens satisfy: 2.4 < R4 / f < 3.2. Meeting the above range, by reasonably setting the shape of the object side surface of the second lens, it is beneficial to converge light, balance the aberrations brought by the first lens, reduce the difficulty of distortion correction, make the image in the edge field of view of the lens undistorted, and improve the imaging quality of the optical system. More specifically, -8.89 < R3 / f < -4.57; 2.69 < R4 / f < 2.91.

[0066] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: -6 < R5 / R6 < -0.8. Meeting the above range and reasonably defining the shape of the third lens can control the third lens to have an appropriate surface shape, make the light trend reasonable, and improve the imaging quality. More specifically, -5.55 < R5 / R6 < -0.93.

[0067] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 0 < (R9 - R10) / (R9 + R10) < 0.5. Meeting the above range can reduce spherical aberration while increasing the relative illumination of the marginal field of view. More specifically, 0.09 < (R9 - R10) / (R9 + R10) < 0.34.

[0068] In some embodiments, the sagittal height Sag3 of the clear aperture of the object side surface of the second lens and the clear aperture diameter d3 of the object side surface of the second lens satisfy: 0 < Sag3 / d3 < 0.3; the sagittal height Sag4 of the clear aperture of the image side surface of the second lens and the clear aperture diameter d4 of the image side surface of the second lens satisfy: 0.3 < Sag4 / d4 < 0.6. Meeting the above range helps to control the trend of light rays in the marginal field of view and highlight the detailed information of the central field of view of the optical lens. More specifically, 0 < Sag3 / d3 < 0.21; 0.39 < Sag4 / d4 < 0.46.

[0069] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 4.8 < IH / EPD < 6.1. Meeting the above range can increase the width of the light beam entering the optical lens, improve the brightness of the optical lens at the image plane, and avoid vignetting. More specifically, 5.47 < IH / EPD < 6.09.

[0070] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle satisfy: 2.7 < IH / f < 3.7. Meeting the above range can reasonably control the relationship between the image height and the focal length, which helps the optical lens to achieve high pixel characteristics. More specifically, 3.03 < IH / f < 3.39.

[0071] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL satisfy: 0.75 < BFL / f < 0.95. Meeting the above range can make the lens have an appropriate back focus, which is beneficial to the assembly of the module, reduces interference, and improves the production yield. More specifically, 0.83 < BFL / f < 0.89.

[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -6 < f1 / f < -4.3. Meeting the above range can make the first lens have a negative optical power, which is beneficial to reducing the inclination angle of the incident light rays, and is beneficial to collecting as much marginal field light as possible into the rear optical lens to achieve large-angle light collection. More specifically, -5.47 < f1 / f < -4.72.

[0073] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -4.4 < f2 / f < -2.8. Meeting the above range and defining that the second lens has an appropriate negative optical power helps to share the negative refractive power of the front lens, reduce the generation of higher-order aberrations, and facilitate the subsequent lenses to improve the imaging quality. More specifically, -4.02 < f2 / f < -3.1.

[0074] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2.5 < f4 / f < 3.6. Meeting the above range can effectively converge light rays, correct the aberrations generated by the front lens, and improve the overall imaging quality. More specifically, 2.82 < f4 / f < 3.3.

[0075] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -23 < f5 / f < -4.2. Meeting the above range can make the fifth lens have a negative optical power, which is beneficial to increasing the imaging area and the field angle of the optical lens and improving the imaging quality of the optical lens. More specifically, -20.74 < f5 / f < -4.74.

[0076] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.6 < f6 / f < 2. Meeting the above range can make the sixth lens have a positive optical power, improve the light converging ability of the optical lens, balance the aberrations of the optical lens, and improve the imaging quality of the optical lens. More specifically, 1.78 < f6 / f < 1.87.

[0077] In some embodiments, the effective focal length f of the optical lens and the curvature radius R5 of the object side surface of the third lens satisfy: -24.8 < R5 / f < -18.7; the effective focal length f of the optical lens and the curvature radius R6 of the image side surface of the third lens satisfy: 3.5 < R6 / f < 24.3. Meeting the above range and reasonably controlling the surface shapes of the object side and the image side of the third lens helps to balance the higher-order aberrations of the front lens and at the same time reduce the difficulty of aberration correction for the rear lens. More specifically, -22.67 < R5 / f < -20.69; 3.91 < R6 / f < 22.13.

[0078] In some embodiments, the focal length f2 of the second lens and the curvature radius R3 of the object side surface of the second lens satisfy: 1.3 < R3 / f2 < 2.5; the focal length f2 of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: -1 < R4 / f2 < -0.6. Meeting the above conditions, by reasonably setting the surface shape of the second lens, the incident light can be further diverged, which is beneficial to increasing the field angle of the system. While increasing the field angle, it reduces the difficulty of distortion correction for the edge field of view, making the lens have less distortion and improving the overall imaging quality. More specifically, 1.46 < R3 / f2 < 2.23; -0.88 < R4 / f2 < -0.71.

[0079] In some embodiments, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: |(R5 + R6) / (R5 - R6)| < 0.8. Meeting the above range, reasonably limiting the shapes of the object side surface and the image side surface of the third lens can control the third lens to have an appropriate surface shape, make the light trend reasonable, and improve the imaging quality. More specifically, -0.04 < (R5 + R6) / (R5 - R6) < 0.7.

[0080] In some embodiments, the clear aperture d1 of the object side surface of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: -0.65 < d1 / IH / Tan(FOV / 2) < -0.45. Meeting the above range can balance the relationship between the front port diameter, the field angle, and the image plane size of the optical lens, which is beneficial to miniaturization. More specifically, -0.6 < d1 / IH / Tan(FOV / 2) < -0.49. ;

[0081] In some embodiments, the focal length f3 of the third lens and the distance CT34 along the optical axis between the third lens and the fourth lens satisfy: -38.7 < f3 / CT34 < -11.6. Meeting the above range can make the light deflection gentle, reduce the sensitivity of the system, which is beneficial to reducing the astigmatism, distortion, and chromatic aberration of the optical imaging system and improving the resolution power. More specifically, -35.17 < f3 / CT34 < -12.84.

[0082] In some embodiments, the optical lens satisfies the conditional expressions: 1.2 mm < f < 1.6 mm, 190° < FOV < 210°, 0.7 mm < EPD < 0.85 mm, 13 mm < TTL < 14 mm, 1.6 < Fno < 2, 4 mm < IH < 5 mm, 29° < CRA < 34°, 1.1 mm < BFL < 1.3 mm, where 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, TTL represents the total optical length of the optical lens, Fno represents the f-number of the optical lens, IH represents the image height corresponding to the maximum field of view angle of the optical lens, CRA represents the chief ray angle of incidence at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least the characteristics of a large field of view angle, a small volume, a relatively large image plane, and a large aperture. More specifically, 1.35 mm < f < 1.43 mm, 199° < FOV < 201°, 0.7 mm < EPD < 0.85 mm, 13.56 mm < TTL < 13.63 mm, 1.7 < Fno < 1.9, 4.1 mm < IH < 4.7 mm, 31.6° < CRA < 32°, 1.15 mm < BFL < 1.25 mm.

[0083] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. Additionally, when the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The first lens and the fourth lens in the optical lens provided by the present invention are made of glass lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are all made of plastic lenses. Adopting a glass-plastic hybrid structure can improve the thermal stability performance.

[0084] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth 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 second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens of the present invention adopt spherical lenses, and the first lens and the fourth lens adopt spherical lenses.

[0085] In various embodiments of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0086]

[0087] Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, F, G, and H are the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively.

[0088] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0089] Example 1

[0090] Please see Figure 1 The diagram shown is a structural schematic of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens includes, in sequence along the optical axis from the object side to the imaging plane: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0091] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0092] The second lens L2 has negative optical power, and its object side S3 is concave near the optical axis, while its image side S4 is concave.

[0093] The third lens L3 has negative optical power, and its object side S5 and image side S6 are both concave.

[0094] The fourth lens L4 has positive optical power, and both its object-side surface S7 and image-side surface S8 are convex.

[0095] The fifth lens L5 has negative optical power, with its object side S9 being convex and its image side S10 being concave.

[0096] The sixth lens L6 has positive optical power, and both its object-side surface S11 and image-side surface S12 are convex.

[0097] The seventh lens L7 has negative optical power, its object side S13 is concave, and its image side S14 is concave near the optical axis.

[0098] The object-side surface S15 and the image-side surface S16 of filter G1 are both planar.

[0099] The imaging plane S17 is a plane.

[0100] The second, third, fifth, sixth, and seventh lenses are made of plastic aspherical lenses, while the first and fourth lenses are made of glass spherical lenses.

[0101] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0102] Table 1-1

[0103]

[0104]

[0105] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0106] Table 1-2

[0107] Face number K B C D E F G H S3 2.69E+00 2.14E-02 -1.99E-03 1.10E-04 4.23E-06 -4.42E-07 -4.22E-08 4.37E-09 S4 1.21E+00 1.62E-02 6.80E-04 1.75E-03 -8.46E-04 7.18E-05 6.05E-05 -1.27E-05 S5 8.10E+01 -2.44E-02 1.35E-03 -6.50E-04 8.15E-05 -5.22E-06 1.04E-05 -1.34E-06 S6 3.11E+00 -6.09E-03 3.31E-03 -1.32E-03 8.87E-04 -2.91E-04 5.49E-05 -2.67E-06 S9 -4.46E+00 -5.83E-02 1.41E-02 -5.37E-03 1.21E-03 2.59E-05 -2.71E-04 6.70E-05 S10 -2.37E+00 -4.36E-02 2.07E-02 -6.02E-03 1.07E-03 -2.03E-04 -4.01E-05 7.85E-06 S11 -4.05E-01 -1.35E-02 3.74E-03 -2.39E-04 -3.70E-04 9.25E-06 2.77E-05 4.97E-06 S12 -5.00E-02 1.37E-02 -7.39E-03 3.18E-03 -1.07E-03 3.59E-05 6.89E-05 1.72E-05 S13 1.51E+02 -6.77E-02 9.81E-03 -2.92E-03 -4.52E-04 1.90E-04 4.40E-05 -3.83E-06 S14 -1.05E+01 -3.80E-02 9.70E-03 -1.76E-03 -9.66E-05 6.52E-05 -1.91E-06 -9.69E-07

[0108] In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, transverse chromatic aberration curve, MTF curve, and relative illumination curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown.

[0109] Figure 2 The field curvature curve of Example 1 is shown, which represents the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.02 mm, indicating that the optical lens can effectively correct the field curvature.

[0110] Figure 3 The F-Theta distortion curve of Example 1 is shown, which represents the distortion of light of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the distortion of the optical lens is controlled within ±15%, indicating that the optical lens can effectively correct distortion.

[0111] Figure 4 The diagram shows the axial aberration curve of the optical lens 100 in this embodiment, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the axial aberration offset is controlled within ±0.02 mm, indicating that the optical lens can effectively correct axial aberration.

[0112] Figure 5 The diagram shows the transverse chromatic aberration curve of the optical lens 100 in this embodiment. It represents the chromatic aberration of each wavelength relative to the center wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±4 μm, indicating that the optical lens can effectively correct chromatic aberration.

[0113] Figure 6 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. As can be seen from the figure, the MTF value of this example is above 0.3 throughout the entire field of view. Within the range of 0–200 lp / mm, the MTF curve decreases smoothly and uniformly from the center to the edge of the field of view, exhibiting good imaging quality and good detail resolution at both low and high frequencies.

[0114] Figure 7 The relative illumination curves for Example 1 are shown, representing the relative illumination values ​​at different field-of-view angles on the imaging plane. The horizontal axis represents the half-field angle (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 60% at the maximum half-field angle, indicating that the optical lens has good relative illumination.

[0115] Example 2

[0116] Please see Figure 8 The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1. The main difference is that the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0117] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0118] Table 2-1

[0119]

[0120]

[0121] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0122] Table 2-2

[0123] Face number K B C D E F G H S3 2.69E+00 2.14E-02 -1.99E-03 1.10E-04 4.23E-06 -4.41E-07 -4.21E-08 4.38E-09 S4 1.21E+00 1.61E-02 5.91E-04 1.73E-03 -8.52E-04 7.09E-05 6.04E-05 -1.27E-05 S5 8.10E+01 -2.43E-02 1.37E-03 -6.49E-04 8.15E-05 -5.21E-06 1.04E-05 -1.32E-06 S6 3.11E+00 -6.09E-03 3.33E-03 -1.32E-03 8.85E-04 -2.93E-04 5.28E-05 -3.92E-06 S9 2.22E+116 -5.83E-02 1.40E-02 -5.39E-03 1.19E-03 1.94E-05 -2.74E-04 6.62E-05 S10 -2.37E+00 -4.36E-02 2.06E-02 -6.03E-03 1.06E-03 -2.06E-04 -4.30E-05 5.35E-06 S11 -4.05E-01 -1.33E-02 3.85E-03 -2.24E-04 -3.50E-04 9.90E-06 2.84E-05 5.48E-06 S12 -5.00E-02 1.37E-02 -7.40E-03 3.18E-03 -1.07E-03 3.97E-05 7.16E-05 1.89E-05 S13 1.51E+02 -6.77E-02 9.79E-03 -2.90E-03 -4.35E-04 2.02E-04 4.55E-05 -3.98E-06 S14 -1.05E+01 -3.79E-02 9.73E-03 -1.75E-03 -9.55E-05 6.55E-05 -1.84E-06 -9.39E-07

[0124] In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, transverse chromatic aberration curve, MTF curve, and relative illumination curve of the optical lens 200 are respectively as follows: Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 , Figure 14 As shown.

[0125] from Figure 9 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.03mm, indicating that the optical lens can effectively correct the field curvature.

[0126] from Figure 10 As can be seen, the distortion of the optical lens is controlled within ±4%, indicating that the optical lens can effectively correct distortion.

[0127] from Figure 11 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0128] from Figure 12 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±5μm, indicating that the optical lens can correct chromatic aberration well.

[0129] from Figure 13 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 200 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0130] from Figure 14 As can be seen, the relative illumination value of the optical lens is still greater than 60% at the maximum half field of view, indicating that the optical lens has good relative illumination.

[0131] Example 3

[0132] Please see Figure 15 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1. The main difference is that the object side surface S13 of the seventh lens L7 is convex near the optical axis; the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0133] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0134] Table 3-1

[0135]

[0136] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0137] Table 3-2

[0138] Face number K B C D E F G H S3 2.69E+00 2.14E-02 -1.99E-03 1.10E-04 4.20E-06 -4.42E-07 -4.21E-08 4.37E-09 S4 1.21E+00 1.61E-02 5.91E-04 1.72E-03 -8.53E-04 7.09E-05 6.04E-05 -1.27E-05 S5 8.10E+01 -2.43E-02 1.37E-03 -6.49E-04 8.15E-05 -5.21E-06 1.04E-05 -1.32E-06 S6 3.11E+00 -6.09E-03 3.33E-03 -1.32E-03 8.85E-04 -2.93E-04 5.28E-05 -3.92E-06 S9 -4.53E+00 -5.86E-02 1.40E-02 -5.42E-03 1.19E-03 2.76E-05 -2.64E-04 7.06E-05 S10 -2.37E+00 -4.37E-02 2.06E-02 -6.04E-03 1.08E-03 -1.94E-04 -3.87E-05 3.13E-06 S11 -3.88E-01 -1.32E-02 3.95E-03 -1.92E-04 -3.40E-04 -4.53E-07 2.75E-05 6.50E-06 S12 -4.45E-02 1.35E-02 -7.37E-03 3.21E-03 -1.06E-03 4.32E-05 7.33E-05 2.00E-05 S13 1.44E+02 -6.77E-02 9.50E-03 -3.01E-03 -4.52E-04 2.12E-04 6.20E-05 -3.08E-06 S14 -9.96E+00 -3.85E-02 9.75E-03 -1.76E-03 -9.64E-05 6.59E-05 -1.56E-06 -8.25E-07

[0139] In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, transverse chromatic aberration curve, MTF curve, and relative illumination curve of the optical lens 300 are respectively as follows: Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 , Figure 21 As shown.

[0140] from Figure 16 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.02mm, indicating that the optical lens can effectively correct the field curvature.

[0141] from Figure 17 As can be seen, the distortion of the optical lens is controlled within ±10%, indicating that the optical lens can effectively correct distortion.

[0142] from Figure 18 As can be seen, the axial aberration offset is controlled within ±0.01mm, indicating that the optical lens can effectively correct axial aberration.

[0143] from Figure 19 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±4μm, indicating that the optical lens can correct chromatic aberration well.

[0144] from Figure 20 As can be seen, the MTF value of this embodiment is above 0.3 throughout the entire field of view. In the range of 0 to 200 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0145] from Figure 21 As can be seen, the relative illumination value of the optical lens is still greater than 60% at the maximum half field of view, indicating that the optical lens has good relative illumination.

[0146] Please refer to Table 4 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0147] Table 4

[0148] Parameters and conditional expressions Example 1 Example 2 Example 3 f(mm) 1.42 1.36 1.38 FOV (°) 200.00 200.00 200.00 EPD (mm) 0.79 0.76 0.77 TTL(mm) 13.62 13.57 13.57 Fno 1.80 1.80 1.80 IH(mm) 4.40 4.60 4.20 CRA(°) 31.90 31.67 31.79 BFL (mm) 1.19 1.19 1.19 TTL / IH 3.10 2.95 3.23 IH / EPD 5.60 6.08 5.48 IH / f 3.11 3.38 3.04 BFL / f 0.84 0.88 0.86 (FOV×f) / IH(°) 64.32 59.18 65.71 f1 / f -5.23 -5.46 -4.73 f2 / f -3.11 -3.24 -4.01 f3 / f -5.05 -7.11 -16.38 f4 / f 3.29 2.83 3.21 f5 / f -20.73 -8.11 -4.75 f6 / f 1.79 1.86 1.83 f7 / f -2.74 -5.67 -3.63 f123 / f -0.93 -1.10 -1.45 f4567 / f 1.65 1.71 2.07 R3 / f -4.58 -4.77 -8.88 R4 / f 2.70 2.81 2.90 R5 / f -21.73 -22.66 -20.70 R6 / f 3.92 5.88 22.12 R5 / R6 -5.54 -3.85 -0.94 R3 / f2 1.47 1.47 2.22 R4 / f2 -0.87 -0.87 -0.72 (R9-R10) / (R9+R10) 0.10 0.16 0.33 (R3+R4) / (R3-R4) 0.26 0.26 0.51 (R5+R6) / (R5-R6) 0.69 0.59 -0.03 Sag3 / d3 0.02 0.01 0.20 Sag4 / d4 0.43 0.40 0.45 d1 / (IH / 2) / tan(FOV / 2) -0.53 -0.50 -0.59 f3 / CT34 -12.85 -15.04 -35.16

[0149] In summary, the optical lens provided by the present invention uses seven lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as ultra-wide field of view, small size, and high imaging quality.

[0150] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0151] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens comprising seven lenses, characterized in that, It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, whose object side is convex and whose image side is concave; A second lens with a negative optical power, whose object side is concave near the optical axis and whose image side is concave; A third lens with a negative optical power, whose object side and image side are both concave; A fourth lens with a positive optical power, whose object side and image side are both convex; A fifth lens with a negative optical power, whose object side is convex and whose image side is concave; A sixth lens with a positive optical power, whose object side and image side are both convex; A seventh lens with a negative optical power, whose image side is concave near the optical axis; Among them, the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 0.1 < (R3 + R4) / (R3 - R4) < 0.

8.

2. The optical lens according to claim 1, characterized in that, The overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.7 < TTL / IH < 3.

4.

3. The optical lens according to claim 1, characterized in that, The maximum field angle FOV of the optical lens, the effective focal length f of the optical lens, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 55° < (FOV × f) / IH < 70°.

4. The optical lens according to claim 1, characterized in that, The focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -18 < f3 / f < -4.

5.

5. The optical lens according to claim 1, characterized in that, The focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -6.2 < f7 / f < -2.

5.

6. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the combined focal length f123 of the first lens, the second lens, and the third lens satisfy: -1.6 < f123 / f < -0.8; the effective focal length f of the optical lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens satisfy: 1.5 < f4567 / f < 2.

3.

7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the curvature radius R3 of the object side of the second lens satisfy: -9.6 < R3 / f < -4.1; the effective focal length f of the optical lens and the curvature radius R4 of the image side of the second lens satisfy: 2.4 < R4 / f < 3.

2.

8. The optical lens according to claim 1, characterized in that, The curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: -6 < R5 / R6 < -0.

8.

9. The optical lens according to claim 1, characterized in that, The curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 0 < (R9 - R10) / (R9 + R10) < 0.

5.

10. The optical lens according to claim 1, characterized in that, The sagittal height Sag3 of the clear aperture of the object side of the second lens and the clear aperture diameter d3 of the object side of the second lens satisfy: 0 < Sag3 / d3 < 0.3; the sagittal height Sag4 of the clear aperture of the image side of the second lens and the clear aperture diameter d4 of the image side of the second lens satisfy: 0.3 < Sag4 / d4 < 0.6.

Images