Optical lens

Abstract

The application provides an optical lens, which has ten lenses with optical power, and sequentially comprises, along an optical axis from an object side to an imaging surface, a first lens with negative optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; a second lens with negative optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; a third lens with optical power, whose object side surface is a concave surface and whose image side surface is a convex surface; a fourth lens with negative optical power, whose object side surface is a concave surface and whose image side surface is a convex surface; a fifth lens with positive optical power; a sixth lens with optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; a seventh lens with positive optical power, whose object side surface is a convex surface; an eighth lens with positive optical power; a ninth lens with negative optical power; and a tenth lens with positive optical power. 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] In the field of modern motion capture, high-performance portable optical systems are a core requirement. Currently, most action camera lenses on the market employ large-aperture, ultra-wide-angle designs to adapt to high-speed motion scenes and extreme environments. However, these traditional optical structures generally suffer from reduced image quality in low-light conditions and insufficient dynamic range. Simultaneously, the increased field of view makes aberration correction difficult, further degrading image quality; and existing lenses have relatively small imaging surfaces, making it difficult to meet market demands. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an optical lens with the advantage of excellent image quality.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] An optical lens comprising ten lenses with optical power, arranged sequentially along the optical axis from the object side to the imaging plane:

[0006] The first lens with negative optical power has a convex object side and a concave image side.

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

[0008] A third lens with optical power has a concave object side and a convex image side.

[0009] The fourth lens with negative optical power has a concave object side and a convex image side.

[0010] A fifth lens with positive optical power;

[0011] The sixth lens, which has optical power, has a convex object-side surface and a concave image-side surface.

[0012] The seventh lens, which has positive optical power, has a convex object-side surface;

[0013] The eighth lens, which has positive optical power, has a convex image-side surface;

[0014] The ninth lens has negative optical power and its object side is concave.

[0015] The tenth lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0016] The true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half-field angle of the optical lens satisfy: 1 < (IH / 2) / (f×θ) < 1.2.

[0017] Further preferably, the optical lens satisfies one or more of the following conditional expressions: The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6 < TTL / f < 7; 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: 1.9 < TTL / IH < 2.2.

[0018] Further preferably, the optical lens satisfies one or more of the following conditional expressions: The maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 55° < FOV / Fno < 60°; 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: 8.5 < IH / EPD < 9.5.

[0019] Further preferably, the optical lens satisfies one or more of the following conditional expressions: The true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 3 < IH / f < 3.4; The half clear aperture d1 of the object side 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: 0.15 < d1 / (IH / 2) / tan(FOV / 2) < 0.19; The true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half-field angle of the optical lens satisfy: 1.11 < (IH / 2) / (f×θ) < 1.15.

[0020] Further preferably, the optical lens satisfies one or more of the following conditional expressions: The total optical length TTL of the optical 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: 9 < 180°×TTL / (IH / 2) / (FOV / 2) < 9.5; The effective focal length f of the optical 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: 45° < f×FOV / IH < 55°.

[0021] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -11 < f1 / f < -3.5; the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -2.9 < f2 / f < -1.6; the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 4.2 < |f3 / f| < 105; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -3.3 < f4 / f < -2.6; the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 3.6 < f5 / f < 9; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 5.2 < |f6 / f| < 55; the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.2 < f7 / f < 1.7; the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: 1 < f8 / f < 1.2; the focal length f9 of the ninth lens and the effective focal length f of the optical lens satisfy: -1 < f9 / f < -0.75; the focal length f10 of the tenth lens and the effective focal length f of the optical lens satisfy: 1.4 < f10 / f < 1.9.

[0022] Further preferably, an aperture is provided between the fifth lens and the sixth lens; the optical lens satisfies one or more of the following conditional expressions: the combined focal length fa of the lenses in front of the aperture and the effective focal length f of the optical lens satisfy: -1.8 < fa / f < -1.1; the combined focal length fb of the lenses behind the aperture and the effective focal length f of the optical lens satisfy: 1.7 < fb / f < 2.3; the combined focal length fa of the lenses in front of the aperture and the combined focal length fb of the lenses behind the aperture satisfy: -0.95 < fa / fb < -0.5; the focal length f1 of the first lens and the focal length f10 of the tenth lens satisfy: -7.5 < f1 / f10 < -2.1.

[0023] Further preferably, the sixth lens and the seventh lens form a cemented lens group with positive optical power; the eighth lens and the ninth lens form a cemented lens group with negative optical power; the optical lens satisfies one or more of the following conditional expressions: the combined focal length f glue1 of the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 1.3 < f glue1 / f < 2.2; the combined focal length f glue2 of the eighth lens and the ninth lens and the effective focal length f of the optical lens satisfy: -6 < f glue2 / f < -2.2; the combined focal length f glue1 of the sixth lens and the seventh lens and the combined focal length f glue2 of the eighth lens and the ninth lens satisfy: -0.65 < f glue1 / f glue2 < -0.3.

[0024] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the minimum focal length f_pos_min among all the lenses with positive optical power and the maximum focal length f_neg_max among all the lenses with negative optical power satisfy: -1.5 < f_pos_min / f_neg_max < -1; the maximum focal length f_pos_max among all the lenses with positive optical power and the minimum focal length f_neg_min among all the lenses with negative optical power satisfy: -3.4 < f_pos_max / f_neg_min < -0.45; the maximum central thickness CT_max among the first lens to the tenth lens and the minimum central thickness CT_min among the first lens to the tenth lens satisfy: 9 < CT_max / CT_min < 25.

[0025] Further preferably, the optical lens satisfies one or more of the following conditional expressions: the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -0.8 < f4 / f5 < -0.3; the focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy: 1 < f7 / f8 < 1.6; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 1.6 < f1 / f2 < 6.5; the focal length f9 of the ninth lens and the focal length f10 of the tenth lens satisfy: -0.65 < f9 / f10 < -0.45.

[0026] The optical lens provided by the present invention uses ten 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, improve the imaging quality of the optical lens, and make the lens have one or more advantages such as miniaturization, large field angle, large image plane, high pixel, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0028] Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 2 is a graph of F-Theta distortion of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 3 is a graph of axial aberration of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 4 is a graph of MTF of the optical lens in Embodiment 1 of the present invention.

[0032] Figure 5This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0033] Figure 6 This is the F-Theta distortion curve of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 7 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 8 This is the MTF curve of the optical lens in Embodiment 2 of the present invention.

[0036] Figure 9 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0037] Figure 10 This is the F-Theta distortion curve of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 11 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 12 This is an MTF curve of the optical lens in Embodiment 3 of the present invention.

[0040] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The optical lens of this invention has ten lenses with optical power, 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, seventh lens, eighth lens, ninth lens, and tenth lens.

[0049] 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 convex and its image side being concave. The third lens may have a positive or negative optical power, with its object side being concave and its image side being convex. The fourth lens may have a negative optical power, with its object side being concave and its image side being convex. The fifth lens may have a positive optical 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 positive or negative optical power, with its object side being convex and its image side being concave. The seventh lens may have a positive optical power, with its object side being convex and its image side being either concave or convex. The eighth lens may have a positive optical power, with its object side being either concave or convex and its image side being convex. The ninth lens may have a negative optical power, with its object side being concave and its image side being either concave or convex. The tenth lens may have a positive optical power, with its object side being convex and its image side being convex.

[0050] In some embodiments, the optical lens may further include an aperture, which may be located between the fifth lens and the sixth lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the imaging.

[0051] In some embodiments, the optical lens may further include a filter, which is disposed between the tenth lens and the imaging surface. The filter is used to filter out interfering light and prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0052] In some embodiments, the sixth lens and the seventh lens may be glued together to form a glued lens group with a positive optical power, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens. In some embodiments, the combined focal length f_glue1 of the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 1.3 < f_glue1 / f < 2.2. More specifically, 1.39 < f_glue1 / f < 2.06.

[0053] In some embodiments, the eighth lens and the ninth lens can be glued together to form a cemented lens group with a negative optical power, which can effectively correct the chromatic aberration of the optical lens, reduce the decentration sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens. It can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens. In some embodiments, the combined focal length f_ce2 of the eighth lens and the ninth lens and the effective focal length f of the optical lens satisfy: -6 < f_ce2 / f < -2.2; the combined focal length f_ce1 of the sixth lens and the seventh lens and the combined focal length f_ce2 of the eighth lens and the ninth lens satisfy: -0.65 < f_ce1 / f_ce2 < -0.3. More specifically, -5.69 < f_ce2 / f < -2.35; -0.6 < f_ce1 / f_ce2 < -0.32.

[0054] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half-field angle of the optical lens satisfy: 1 < (IH / 2) / (f×θ) < 1.2. Satisfying the above range can make the lens have a small distortion value and provide a high-definition imaging effect. More specifically, 1.11 < (IH / 2) / (f×θ) < 1.15.

[0055] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6 < TTL / f < 7. Satisfying the above range can effectively limit the length of the lens and is conducive to the miniaturization of the optical lens. More specifically, 6.45 < TTL / f < 6.66.

[0056] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.9 < TTL / IH < 2.2. Satisfying the above range ensures that the lens has a larger image plane under the same overall length, can match a larger-size imaging chip to achieve high-definition imaging, and can better achieve the balance between the small overall length and the large image plane of the lens. More specifically, 2.05 < TTL / IH < 2.09.

[0057] In some embodiments, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 55° < FOV / Fno < 60°. Satisfying the above range limits the optical lens to have an appropriate field angle and aperture value, can collect light at a large angle, and obtain good imaging quality. More specifically, 57.2° < FOV / Fno < 57.22°.

[0058] 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: 8.5 < IH / EPD < 9.5. Meeting the above range can increase the width of the light beam entering the optical lens, improve the brightness at the image plane of the optical lens, and avoid the generation of vignetting. More specifically, 8.76 < IH / EPD < 8.97.

[0059] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 3 < IH / f < 3.4. Meeting the above range and controlling the image height and focal length of the optical lens within a reasonable range contribute to the optical lens having the characteristic of a large image plane and improving the imaging quality. More specifically, 3.12 < IH / f < 3.21.

[0060] In some embodiments, the clear aperture radius 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: 0.15 < d1 / (IH / 2) / tan(FOV / 2) < 0.19. Meeting the above range can ensure the balance between the size of the optical lens, the field angle, and the image plane.

[0061] In some embodiments, the overall optical length TTL of the optical 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: 9 < 180°×TTL / (IH / 2) / (FOV / 2) < 9.5. Meeting the above range can achieve a balance among the image height, focal length, and overall optical length, and improve the imaging quality of the optical lens. More specifically, 9.26 < 180°×TTL / (IH / 2) / (FOV / 2) < 9.36.

[0062] In some embodiments, the effective focal length f of the optical 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: 45° < f×FOV / IH < 55°. Meeting the above conditional formula, by reasonably restricting the relationship among the focal length, field angle, and image height of the optical lens, it is beneficial to achieve the balance between the field angle of the optical lens and large target surface imaging, and better meet the usage requirements of high image quality shooting of the optical lens. More specifically, 50.06° < f×FOV / IH < 51.13°.

[0063] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -11 < f1 / f < -3.5. Meeting the above range, the first lens has an appropriate negative focal length, which is beneficial to expanding the field angle of the optical lens. More specifically, -10.14 < f1 / f < -3.8.

[0064] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -2.9 < f2 / f < -1.6. When within the above range, and the second lens is also a negative lens, it can further diverge light and increase the field angle of the imaging system. More specifically, -2.71 < f2 / f < -1.7.

[0065] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 4.2 < |f3 / f| < 105. When within the above range, it is beneficial for the smooth transition of light, facilitating the correction of astigmatism and field curvature, improving the imaging quality of the optical lens, and ensuring the stability of the optical system. More specifically, 4.5 < |f3 / f| < 99.4.

[0066] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -3.3 < f4 / f < -2.6. When within the above range, various aberrations of the optical lens can be fully corrected, the resolution can be improved, and high resolution can be achieved. More specifically, -3.11 < f4 / f < -2.84.

[0067] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 3.6 < f5 / f < 9. When within the above range, it is beneficial for the smooth transition of light, facilitating the correction of astigmatism and field curvature, improving the imaging quality of the optical lens, and ensuring the stability of the optical system. More specifically, 4.05 < f5 / f < 8.19.

[0068] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 5.2 < |f6 / f| < 55; the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.2 < f7 / f < 1.7. When within the above range, the optical path difference between different fields can be adjusted, the resolution can be improved, it is beneficial for light to enter the rear lens smoothly, further the field curvature can be reduced, and the off-axis point aberration of the optical lens can be corrected. More specifically, 5.69 < |f6 / f| < 51.79; 1.27 < f7 / f < 1.6.

[0069] In some embodiments, the focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: 1 < f8 / f < 1.2; the focal length f9 of the ninth lens and the effective focal length f of the optical lens satisfy: -1 < f9 / f < -0.75. When within the above range, the cooperation of the eighth lens with positive optical power and the ninth lens with negative optical power can adjust the optical path difference between different fields, improve the resolution, it is beneficial for light to enter the rear lens smoothly, further the field curvature can be reduced, and the off-axis point aberration of the optical lens can be corrected. More specifically, 1.03 < f8 / f < 1.17; -0.94 < f9 / f < -0.79.

[0070] In some embodiments, the focal length f10 of the tenth lens and the effective focal length f of the optical lens satisfy: 1.4 < f10 / f < 1.9. The tenth lens satisfying the above conditions helps to reasonably collect light, ensure the light transmission amount, improve the relative illuminance, and enhance the brightness of the optical lens at the image plane. More specifically, 1.45 < f10 / f < 1.84.

[0071] In some embodiments, the combined focal length fa of the lenses located in front of the aperture and the effective focal length f of the optical lens satisfy: -1.8 < fa / f < -1.1; the combined focal length fb of the lenses located behind the aperture and the effective focal length f of the optical lens satisfy: 1.7 < fb / f < 2.3; the combined focal length fa of the lenses located in front of the aperture and the combined focal length fb of the lenses located behind the aperture satisfy: -0.95 < fa / fb < -0.5. Satisfying the above ranges and reasonably setting the focal length relationship of the lens groups before and after the aperture can reduce the correction difficulty of the aberration of the optical lens and improve the imaging quality of the optical lens. More specifically, -1.73 < fa / f < -1.12; 1.79 < fb / f < 2.12; -0.89 < fa / fb < -0.56.

[0072] In some embodiments, the focal length f1 of the first lens and the focal length f10 of the tenth lens satisfy: -7.5 < f1 / f10 < -2.1. Satisfying the above range, by reasonably setting the focal length relationship of the first and last lenses in the lens, while ensuring that as much light as possible enters the system, the area of light entering the imaging plane is increased, which is beneficial to achieving large image plane imaging of the lens, while increasing the light input amount and improving the relative illuminance of the system. More specifically, -6.97 < f1 / f10 < -2.34.

[0073] In some embodiments, the minimum focal length f_pos_min among all the lenses with positive optical power and the maximum focal length f_neg_max among all the lenses with negative optical power satisfy: -1.5 < f_pos_min / f_neg_max < -1; the maximum focal length f_pos_max among all the lenses with positive optical power and the minimum focal length f_neg_min among all the lenses with negative optical power satisfy: -3.4 < f_pos_max / f_neg_min < -0.45. It can be understood that f_pos_min is the smallest in value among all the lenses with positive optical power and has the greatest influence on the deflection of light rays; f_neg_max is the largest in value among all the lenses with negative optical power and has the greatest influence on the deflection of light rays. f_pos_max is the largest in value among all the lenses with positive optical power and has the smallest influence on the deflection of light rays; f_neg_min is the smallest in value among all the lenses with negative optical power and has the smallest influence on the deflection of light rays. Satisfying the above ranges makes the influence of the lenses on the degree of light ray deflection close, which is beneficial to balancing the aberration of the optical lens. More specifically, -1.4 < f_pos_min / f_neg_max < -1.1; -3.14 < f_pos_max / f_neg_min < -0.51.

[0074] In some embodiments, the maximum central thickness CT_max among the first lens to the tenth lens and the minimum central thickness CT_min among the first lens to the tenth lens satisfy: 9 < CT_max / CT_min < 25. Satisfying the above range can effectively compress the total length of the optical lens and is beneficial to the structural design and production process of the optical lens. More specifically, 9.4 < CT_max / CT_min < 23.63.

[0075] In some embodiments, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -0.8 < f4 / f5 < -0.3; the focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy: 1 < f7 / f8 < 1.6; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 1.6 < f1 / f2 < 6.5; the focal length f9 of the ninth lens and the focal length f10 of the tenth lens satisfy: -0.65 < f9 / f10 < -0.45. Satisfying the above ranges can avoid excessive deflection of light rays and reduce the difficulty of aberration correction. More specifically, -0.77 < f4 / f5 < -0.37; 1.1 < f7 / f8 < 1.53; 1.78 < f1 / f2 < 5.95; -0.59 < f9 / f10 < -0.48.

[0076] In some embodiments, the object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy: 2 < (R1 + R2) / (R1 - R2) < 2.5; the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy: 2.5 < (R3 + R4) / (R3 - R4) < 4.8; the object-side radius of curvature R5 of the third lens and the image-side radius of curvature R6 of the third lens satisfy: 4.2 < |(R5 + R6) / (R5 - R6)| < 15. The first, second, and third lenses are all meniscus negative lenses, collecting as much light as possible from a wide field of view and ensuring smooth entry of light into the rear system, increasing the light transmission of the optical lens and effectively expanding its field of view. More specifically, 2.19 < (R1+R2) / (R1-R2) < 2.37; 2.69 < (R3+R4) / (R3-R4) < 4.46; 4.49 < |(R5+R6) / (R5-R6)| < 14.67.

[0077] In some embodiments, the object-side radius of curvature R7 of the fourth lens and the image-side radius of curvature R8 of the fourth lens satisfy: -2.6 < (R7 + R8) / (R7 - R8) < -1.7. This is beneficial for correcting aberrations and distortions at the edges of the field of view caused by the front lens, resulting in a lens with less distortion and providing high-definition imaging. More specifically, satisfying the above range means -2.41 < (R7 + R8) / (R7 - R8) < -1.8.

[0078] In some embodiments, the object-side radius of curvature R11 of the sixth lens and the image-side radius of curvature R12 of the sixth lens satisfy: 4.4 < |(R11+R12) / (R11-R12)| < 13. Satisfying this range can balance various aberrations generated by the optical lens and improve the imaging quality of the optical lens. More specifically, 4.81 < (R11+R12) / (R11-R12) < 12.02.

[0079] In some embodiments, the radius of curvature R19 of the object side of the tenth lens and the radius of curvature R20 of the image side of the tenth lens satisfy the following condition: 0.2 < (R19 + R20) / (R19 - R20) < 0.4. Meeting this range helps to properly collect light, ensure sufficient light transmission, improve relative illumination, and thus enhance the brightness of the optical lens at the image plane. More specifically, 0.21 < (R19 + R20) / (R19 - R20) < 0.36.

[0080] In some embodiments, the optical lens satisfies the following conditional expressions: 4.8 mm < f < 5.5 mm; 1.7 mm < EPD < 1.9 mm; 32 mm < TTL < 35 mm; 2.6 < Fno < 3; 14° < CRA < 19°; 6 mm < BFL < 7 mm; 150° < FOV < 170°; 15 mm < IH < 17 mm. In the above conditional expressions, f represents the effective focal length 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 aperture value of the optical lens, CRA represents the chief ray angle of incidence at the maximum image height of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field angle of the optical lens, and IH represents the true image height corresponding to the maximum field angle of the optical lens. Meeting the above ranges, the optical lens has at least one or more advantages such as miniaturization, large image plane, large aperture, and large field angle. More specifically, 5.09 mm < f < 5.15 mm; 1.81 mm < EPD < 1.84 mm; 32.95 mm < TTL < 33.96 mm; 2.75 < Fno < 2.85; 15.02° < CRA < 18.04°; 6.12 mm < BFL < 6.9 mm; 160.1° < FOV < 160.3°; 15.97 mm < IH < 16.34 mm. <​​​​​​​​​​​​​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, and F are the fourth, sixth, eighth, tenth, and twelfth order surface coefficients, respectively.

[0086] 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.

[0087] Example 1

[0088] 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, a fourth lens L4, a fifth lens L5, an aperture ST, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, and a filter G1.

[0089] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0090] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0091] The third lens L3 has negative optical power, its object side S5 is concave, and its image side S6 is convex.

[0092] The fourth lens L4 has negative optical power, its object side S7 is concave, and its image side S8 is convex.

[0093] The fifth lens L5 has positive optical power, its object side S9 is convex, and its image side S10 is concave.

[0094] The sixth lens L6 has positive optical power, its object-side surface S11 is convex, and its image-side surface is concave.

[0095] The seventh lens L7 has positive optical power, its object side is convex, and its image side S13 is concave.

[0096] The sixth lens L6 and the seventh lens L7 form a cemented lens group with positive optical power, that is, the cemented surface of the image side of the sixth lens L6 and the object side of the seventh lens L7 is S12.

[0097] The eighth lens L8 has positive optical power, its object side S14 is concave, and its image side is convex.

[0098] The ninth lens L9 has negative optical power, its object side is concave, and its image side S16 is convex.

[0099] The eighth lens L8 and the ninth lens L9 form a cemented lens group with negative optical power, that is, the cemented surface of the image side of the eighth lens L8 and the object side of the ninth lens L9 is S15.

[0100] The tenth lens L10 has positive optical power, its object side S17 is convex, and its image side S18 is convex.

[0101] The object-side surface S19 and the image-side surface S20 of filter G1 are both planar.

[0102] The imaging plane S21 is a plane.

[0103] The first, third, fourth, sixth, seventh, eighth, and ninth lenses are glass spherical lenses, while the second, fifth, and tenth lenses are glass aspherical lenses.

[0104] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0105] Table 1-1

[0106]

[0107] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0108] Table 1-2

[0109]

[0110] In this embodiment, the F-Theta distortion curve, axial aberration curve, and MTF curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 As shown.

[0111] Figure 2 The F-Theta distortion curve of Example 1 is shown, which represents the F-Theta distortion of light at different image heights on the imaging plane. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within 0~20%, indicating that the optical lens can correct distortion well.

[0112] Figure 3 The axial aberration curve of Example 1 is shown, 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 to 0.04 mm, indicating that the optical lens can correct axial aberration well.

[0113] Figure 4 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 0.4 throughout the entire field of view. Within the range of 0–160 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] Example 2

[0115] Please see Figure 5 The diagram shows a schematic of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The optical lens in this embodiment is generally the same as that in Embodiment 1, except that: the third lens L3 has positive optical power; the sixth lens L6 has negative optical power; the object side S9 of the fifth lens L5 is concave; the image side S10 of the fifth lens L5 is convex; the image side S16 of the ninth lens L9 is concave; and the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0116] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0117] Table 2-1

[0118]

[0119] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0120] Table 2-2

[0121]

[0122] In this embodiment, the F-Theta distortion curve, axial aberration curve, and MTF curve of the optical lens 200 are respectively as follows: Figure 6 , Figure 7 , Figure 8 As shown.

[0123] from Figure 6As can be seen, the F-Theta distortion of the optical lens is controlled within 0~30%, indicating that the optical lens can correct distortion well.

[0124] from Figure 7 As can be seen, the axial aberration offset is controlled within -0.04mm to 0.06mm, indicating that the optical lens can effectively correct axial aberration.

[0125] from Figure 8 As can be seen, the MTF value of this embodiment is above 0.28 throughout the entire field of view. In the range of 0 to 160 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.

[0126] Example 3

[0127] Please see Figure 9 The diagram shows a schematic of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The optical lens in this embodiment is generally the same as that in Embodiment 1, except that: the third lens L3 has positive optical power; the image-side surface S10 of the fifth lens L5 is convex; the image-side surface S13 of the seventh lens L7 is convex; the image-side surface S16 of the ninth lens L9 is concave; and the optical parameters such as the radius of curvature, aspherical coefficient, and thickness of each lens surface are different.

[0128] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0129] Table 3-1

[0130]

[0131] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0132] Table 3-2

[0133]

[0134] In this embodiment, the F-Theta distortion curve, axial aberration curve, and MTF curve of the optical lens 300 are respectively as follows: Figure 10 , Figure 11 , Figure 12 As shown.

[0135] from Figure 10 As can be seen, the F-Theta distortion of the optical lens is controlled within 0~20%, indicating that the optical lens can correct distortion well.

[0136] from Figure 11As can be seen, the axial aberration offset is controlled within -0.02mm to 0.04mm, indicating that the optical lens can effectively correct axial aberration.

[0137] from Figure 12 As can be seen, the MTF value of this embodiment is above 0.38 throughout the entire field of view. In the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0138] Please refer to Tables 4-1 and 4-2 for the optical characteristics corresponding to 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.

[0139] Table 4-1

[0140]

[0141] Table 4-2

[0142]

[0143] In summary, the optical lens provided by the present invention uses ten 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 miniaturization, large field of view, large image plane, high pixel count, and high imaging quality.

[0144] 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.

[0145] 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 ten lenses with optical power, 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 convex and whose image side is concave; A third lens with an optical power, whose object side is concave and whose image side is convex; A fourth lens with a negative optical power, whose object side is concave and whose image side is convex; A fifth lens with a positive optical power; A sixth lens with an optical power, whose object side is convex and whose image side is concave; A seventh lens with a positive optical power, whose object side is convex; An eighth lens with a positive optical power, whose image side is convex; A ninth lens with a negative optical power, whose object side is concave; A tenth lens with a positive optical power, whose object side is convex and whose image side is convex; The true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half field angle of the optical lens satisfy: 1 < (IH / 2) / (f×θ) < 1.2; A diaphragm is provided between the fifth lens and the sixth lens; The combined focal length fa of the lenses in front of the diaphragm and the combined focal length fb of the lenses behind the diaphragm satisfy: -0.95 < fa / fb < -0.5; The maximum center thickness CTmax among the first lens to the tenth lens and the minimum center thickness CTmin among the first lens to the tenth lens satisfy: 9 < CTmax / CTmin < 25.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6 < TTL / f < 7; 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: 1.9 < TTL / IH < 2.

2.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: The maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 55° < FOV / Fno < 60°; 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: 8.5 < IH / EPD < 9.

5.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: The true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 3 < IH / f < 3.4; The clear aperture radius d1 of the object side 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: 0.15 < d1 / (IH / 2) / tan(FOV / 2) < 0.19; The true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half field angle of the optical lens satisfy: 1.11 < (IH / 2) / (f×θ) < 1.

15.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: The total optical length TTL of the optical 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: 9 < 180°×TTL / (IH / 2) / (FOV / 2) < 9.5; The effective focal length f of the optical 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: 45° < f×FOV / IH < 55°.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -11 < f1 / f < -3.5; The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -2.9 < f2 / f < -1.6; The focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 4.2 < |f3 / f| < 105; The focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -3.3 < f4 / f < -2.6; The focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 3.6 < f5 / f < 9; The focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 5.2 < |f6 / f| < 55; The focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.2 < f7 / f < 1.7; The focal length f8 of the eighth lens and the effective focal length f of the optical lens satisfy: 1 < f8 / f < 1.2; The focal length f9 of the ninth lens and the effective focal length f of the optical lens satisfy: -1 < f9 / f < -0.75; The focal length f10 of the tenth lens and the effective focal length f of the optical lens satisfy: 1.4 < f10 / f < 1.

9.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: The combined focal length fa of the lenses in front of the aperture and the effective focal length f of the optical lens satisfy: -1.8 < fa / f < -1.1; The combined focal length fb of the lenses behind the aperture and the effective focal length f of the optical lens satisfy: 1.7 < fb / f < 2.3; An aperture is provided between the fifth lens and the sixth lens; The combined focal length fa of the lenses in front of the aperture and the combined focal length fb of the lenses behind the aperture satisfy: -0.89 < fa / fb < -0.56; The focal length f1 of the first lens and the focal length f10 of the tenth lens satisfy: -7.5 < f1 / f10 < -2.

1.

8. The optical lens according to claim 1, characterized in that, The sixth lens and the seventh lens form a cemented lens group with a positive optical power; the eighth lens and the ninth lens form a cemented lens group with a negative optical power; the optical lens satisfies one or more of the following conditional expressions: The combined focal length fc1 of the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 1.3 < fc1 / f < 2.2; The combined focal length fc2 of the eighth lens and the ninth lens and the effective focal length f of the optical lens satisfy: -6 < fc2 / f < -2.2; The combined focal length fc1 of the sixth lens and the seventh lens and the combined focal length fc2 of the eighth lens and the ninth lens satisfy: -0.65 < fc1 / fc2 < -0.

3.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: The minimum focal length fpmin among all the lenses with positive optical power and the maximum focal length fnmax among all the lenses with negative optical power satisfy: -1.5 < fpmin / fnmax < -1; The maximum focal length fpmax among all the lenses with positive optical power and the minimum focal length fnmin among all the lenses with negative optical power satisfy: -3.4 < fpmax / fnmin < -0.45; The maximum central thickness CTmax among the first lens to the tenth lens and the minimum central thickness CTmin among the first lens to the tenth lens satisfy: 9.4 < CTmax / CTmin < 23.

63.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies one or more of the following conditional expressions: The focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -0.8 < f4 / f5 < -0.3; The focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy: 1 < f7 / f8 < 1.6; The focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 1.6 < f1 / f2 < 6.5; The focal length f9 of the ninth lens and the focal length f10 of the tenth lens satisfy: -0.65 < f9 / f10 < -0.45.

Images