Optical lens

Abstract

The application discloses an optical lens, which comprises, along an optical axis from an object side to an imaging surface, a first lens with negative focal power, the object side of which is a convex surface and the image side is a concave surface; a second lens with negative focal power, the object side of which is a concave surface; a third lens with positive focal power, the image side of which is a convex surface; a fourth lens with positive focal power; a fifth lens with positive focal power, the object side of which is a concave surface and the image side is a convex surface; a sixth lens with positive focal power, the object side of which is a convex surface and the image side is a convex surface; and a seventh lens with negative focal power, the object side of which is a concave surface. The optical lens adopts seven lenses, through specific surface shape setting and reasonable focal power distribution, especially the first and second lenses with negative focal power, so that the optical lens can collect a wide range of light, improve the field of view angle of the optical lens, and effectively improve the edge field of view ratio and the angle resolution of the edge field of view through setting the optical lens with large positive distortion.

Description

Technical Field

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

[0002] As people's demands for driving experience continue to increase, automotive optical lenses are being used more and more in intelligent driving, and the status of automotive optical lenses in the automotive industry is constantly rising.

[0003] Advanced Driver Assistance Systems (ADAS) play a crucial role in intelligent driving. They use various cameras and sensors to collect environmental information to ensure driver safety. Existing ADAS systems require multiple cameras on both sides of the vehicle to achieve view fusion, and suffer from poor image quality at the edges of the field of view, making it difficult to clearly distinguish obstacles. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide an optical lens that has at least the advantages of a large field of view and good edge field of view imaging effect.

[0005] This invention provides an optical lens comprising, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens with negative optical power, wherein the object side is convex and the image side is concave; a second lens with negative optical power, wherein the object side is concave; a third lens with positive optical power, wherein the image side is convex; a fourth lens with positive optical power; a fifth lens with positive optical power, wherein the object side is concave and the image side is convex; a sixth lens with positive optical power, wherein the object side is convex and the image side is convex; and a seventh lens with negative optical power, wherein the object side is concave.

[0006] In some implementations, the maximum field of view (FOV) of the optical lens satisfies: 150° < FOV.

[0007] In some implementations, the aperture value FNO of the optical lens satisfies: 2.0 < FNO < 2.30.

[0008] In some implementations, the incident angle CRA of the principal ray at the maximum field of view of the optical lens on the image plane satisfies: 10° < CRA < 20°.

[0009] In some implementations, the total optical length (TTL) of the optical lens and the effective focal length (f) of the optical lens satisfy the condition: 18.0 < TTL / f < 26.0.

[0010] In some implementations, the total optical length TTL of the optical lens and the image height IH corresponding to the maximum field of view of the optical lens satisfy the following condition: 5.0 < TTL / IH < 6.50.

[0011] In some embodiments, the image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half-field of view of the optical lens satisfy: 1.20 < (IH / 2) / (f×θ). Preferably, the image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half-field of view of the optical lens satisfy: 1.22 ≤ (IH / 2) / (f×θ) < 1.40.

[0012] In some implementations, the maximum field of view (FOV) of the optical lens and the aperture value (FNO) of the optical lens satisfy the following condition: 70° < FOV / FNO < 95°.

[0013] In some implementations, the image height IH corresponding to the maximum field of view of the optical lens satisfies the following condition: 3.2 < IH / f.

[0014] In some implementations, the optical back focal length (BFL) of the optical lens and the effective focal length (f) of the optical lens satisfy the condition: 1.5 < BFL / f.

[0015] In some embodiments, the true image height IHm corresponding to the center field of view of the optical lens (which is half the value of the maximum field of view) satisfies the same condition as the image height IH corresponding to the maximum field of view of the optical lens: IHm / IH < 0.49. Preferably, the true image height IHm corresponding to the center field of view of the optical lens (which is half the value of the maximum field of view) satisfies the same condition as the image height IH corresponding to the maximum field of view of the optical lens: IHm / IH ≤ 0.43.

[0016] In some implementations, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f < -3.0.

[0017] In some implementations, the effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: f2 / f < -3.1.

[0018] In some implementations, the effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 5.2 < f3 / f.

[0019] In some implementations, the effective focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 53.0 < f4 / f.

[0020] In some implementations, the effective focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 3.6 < f5 / f.

[0021] In some implementations, the effective focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 2.7 < f6 / f.

[0022] In some implementations, the effective focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: f7 / f < -2.5.

[0023] In some embodiments, the radius of curvature R3 of the object side of the second lens satisfies the condition R3 / f < -4.0 with respect to the effective focal length f of the optical lens.

[0024] In some implementations, the radius of curvature R6 of the image-side surface of the third lens satisfies the condition R6 / f < -4.2 with respect to the effective focal length f of the optical lens.

[0025] In some implementations, the radius of curvature R9 of the object side of the fifth lens satisfies the condition R9 / f < -54.0 with respect to the effective focal length f of the optical lens.

[0026] In some embodiments, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: 0.5 < (R1 - R2) / (R1 + R2) < 0.95. Preferably, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: 0.57 ≤ (R1 - R2) / (R1 + R2) ≤ 0.90.

[0027] In some embodiments, the radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R11 of the object-side surface of the sixth lens satisfy: (R10-R11) / (R10+R11) < -1.8. Preferably, the radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R11 of the object-side surface of the sixth lens satisfy: -2.85 ≤ (R10-R11) / (R10+R11) ≤ -2.07.

[0028] In some embodiments, the total optical length TTL of the optical lens and the sum of the center thicknesses of the first to seventh lenses along the optical axis, ∑CT, satisfy: 0.5 < ∑CT / TTL < 0.75.

[0029] Compared to existing technologies, the optical lens provided by this invention employs seven lenses with optical power. Through specific surface shape settings and reasonable optical power distribution, especially with the first and second lenses using negative optical power, the optical lens can collect as much light as possible over a wide range, improving the field of view and relative illumination. At the same time, by setting the optical lens to have a large positive distortion, it can effectively increase the proportion of the edge field of view in the entire image plane, improving the angular resolution of the edge field of view. Thus, the optical lens can better meet the usage requirements of automotive lenses. Attached Figure Description

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0031] Figure 1 This is a schematic diagram of the structure of the optical lens in Embodiment 1 of the present invention.

[0032] Figure 2 This is the F-θ distortion curve of the optical lens in Embodiment 1 of the present invention.

[0033] Figure 3 This is an MTF curve of the optical lens in Embodiment 1 of the present invention.

[0034] Figure 4 This is a schematic diagram of the optical lens structure of Embodiment 2 of the present invention.

[0035] Figure 5 This is the F-θ distortion curve of the optical lens in Embodiment 2 of the present invention.

[0036] Figure 6 This is the MTF curve of the optical lens in Embodiment 2 of the present invention.

[0037] Figure 7 This is a schematic diagram of the optical lens structure of Embodiment 3 of the present invention.

[0038] Figure 8 This is the F-θ distortion curve of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 9 This is the MTF curve of the optical lens in Embodiment 3 of the present invention.

[0040] Figure 10 This is a schematic diagram of the optical lens structure of Embodiment 4 of the present invention.

[0041] Figure 11 This is the F-θ distortion curve of the optical lens in Embodiment 4 of the present invention.

[0042] Figure 12 This is the MTF curve of the optical lens in Embodiment 4 of the present invention. Detailed Implementation

[0043] To better understand the invention, various aspects of the invention 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 the invention and are not intended to limit the scope of the invention 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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 the invention, the word "may" is used to mean "one or more embodiments of the invention." And the term "exemplary" is intended to refer to an example or illustration.

[0048] 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 invention 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 defined herein.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] The present invention proposes an optical lens, which comprises, along the optical axis from the object side to the imaging plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, and the optical centers of each lens are located on the same straight line.

[0051] In some embodiments, the first lens is configured to have negative optical power, with the object side being convex and the image side being concave. This allows for the acquisition of as much large-angle incident light as possible, expanding the field of view of the optical lens. At the same time, it can reduce the tendency of light to bend, reduce the difficulty of aberration correction for subsequent lenses, and improve the imaging quality of the optical lens. It can also increase the proportion of the edge field of view in the image and enhance the imaging clarity of the edge field of view.

[0052] In some embodiments, the second lens is configured to have negative optical power and a concave object side, which can make the light more reasonably diverge to the rear lens, reduce the field curvature between different fields of view, and help to raise the height of the outgoing light rays, so as to reduce the overlap of light rays from different fields of view on the rear lens, and enable the rear lens to better correct aberrations between different fields of view.

[0053] In some embodiments, the third lens is configured to have positive optical power and a convex image side, which can converge the light rays passing through the second lens and reduce the light ray height, thereby reducing the aperture of the optical lens and slowing down the light ray turning trend to make it transition smoothly. At the same time, it can balance various aberrations generated by the front lens and improve the overall imaging quality of the optical lens.

[0054] In some implementations, the fourth lens is configured to have positive optical power, which can further converge light and reduce the height of light while reducing the tendency of light to change direction so that the light path transitions smoothly. At the same time, it can balance various aberrations generated by the front lens and improve the overall imaging quality of the optical lens.

[0055] In some embodiments, the fifth lens is configured to have positive optical power, with the object side being concave and the image side being convex. This can further converge light, adjust the optical path difference between different fields of view, and reduce the aperture of the rear group of lenses, so that the light emitted from the fifth lens can smoothly transition to the rear, thereby reducing sensitivity, which is beneficial to reducing aberrations and improving the overall imaging quality of the optical lens.

[0056] In some embodiments, the sixth lens is configured to have positive optical power and a convex object-side surface and an convex image-side surface, while the seventh lens is configured to have negative optical power and a concave object-side surface. The sixth and seventh lenses form a cemented lens, which can adjust the light rays passing through the central and peripheral fields of view of the fifth lens. In particular, it can adjust the angle at which the peripheral field of view rays are incident on the imaging plane so that the main rays are emitted parallel to the imaging plane. This can increase the proportion of the peripheral field of view in the image and enhance the image clarity of the peripheral field of view. At the same time, it can correct various aberrations caused by the front lens and improve the overall imaging quality of the optical lens.

[0057] In some implementations, the aperture stop may be positioned between the third and fourth lenses, and the third or fourth lens has the smallest aperture among all lenses. As the aperture gradually decreases from the object side to the aperture stop, light is gradually converged and confined, which helps reduce stray light and unwanted reflections, thereby improving image sharpness and contrast. After the aperture stop, the aperture gradually increases, which helps ensure that more light reaches the imaging surface, thereby improving image brightness and signal-to-noise ratio. It also helps balance the structure and focal length allocation of the front and rear lens groups.

[0058] In some embodiments, the optical lens may further include a filter disposed between the seventh lens and the imaging surface to filter out interference light and prevent interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0059] In some implementations, the maximum field of view (FOV) of the optical lens satisfies: 150° < FOV. Meeting this range facilitates the achievement of wide-angle characteristics, thereby enabling the acquisition of more scene information and meeting the needs of large-area detection.

[0060] In some implementations, the aperture value FNO of the optical lens satisfies the following condition: 2.0 < FNO < 2.30. Meeting this range is beneficial for achieving large aperture characteristics, ensuring image clarity even in low-light environments or at night.

[0061] In some implementations, the angle of incidence (CRA) of the principal ray at the maximum field of view of the optical lens on the image plane satisfies: 10° < CRA < 20°. Meeting this range allows for a larger tolerance range between the CRA of the optical lens and the CRA of the image sensor, improving the adaptability of the optical lens to the image sensor.

[0062] In some implementations, the total optical length (TTL) of the optical lens and the effective focal length (f) of the optical lens satisfy the condition: 18.0 < TTL / f < 26.0. Meeting this range ensures sufficient space to adjust the lens structure and optimize the imaging effect of the optical lens.

[0063] In some implementations, the total optical length (TTL) of the optical lens and the image height (IH) corresponding to the maximum field of view of the optical lens satisfy the following condition: 5.0 < TTL / IH < 6.50. Meeting this range can effectively balance the requirements of image height and total optical length of the optical lens.

[0064] In some embodiments, the image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half-field of view of the optical lens satisfy: 1.20 < (IH / 2) / (f×θ). Satisfying this range allows for a larger positive F-θ distortion, which is beneficial for achieving the ultra-wide-angle characteristics of the optical lens. Simultaneously, it effectively increases the proportion of the edge field of view of the optical lens in the entire image plane, improving the angular resolution of the edge field of view. Preferably, the image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half-field of view of the optical lens satisfy: 1.22 ≤ (IH / 2) / (f×θ) < 1.40.

[0065] In some implementations, the maximum field of view (FOV) of the optical lens and the aperture value (FNO) of the optical lens satisfy the following condition: 70° < FOV / FNO < 95°. Meeting this range allows for the matching of different aperture sizes, thereby better balancing the relationship between the optical lens's field of view and aperture size.

[0066] In some implementations, the image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy the condition: 3.2 < IH / f. Meeting this range ensures compatibility with chips that support large image surfaces, allowing the optical lens to simultaneously possess both a large field of view and a large image surface.

[0067] In some implementations, the optical back focal length (BFL) of the optical lens and the effective focal length (f) of the optical lens satisfy the condition: 1.5 < BFL / f. Meeting this range achieves a balance between good image quality and an easy-to-assemble optical back focal length, which helps ensure the image quality of the optical lens while avoiding interference between the lens and other components, reducing the difficulty of camera module assembly, and improving production yield.

[0068] In some implementations, the true image height IHm corresponding to the center field of view of the optical lens (which is half the value of the maximum field of view) and the image height IH corresponding to the maximum field of view of the optical lens satisfy the following condition: IHm / IH < 0.49. Meeting this range effectively reduces the proportion of the central field of view imaging range in the overall imaging range, highlighting the proportion of the edge field of view imaging range. Compared to lenses with the same field of view, when matched with a chip of the same size, the edge field of view imaging range accounts for a larger proportion of the overall imaging range, thus obtaining more detail information and better meeting the usage requirements of automotive lenses. Preferably, the true image height IHm corresponding to the center field of view of the optical lens (which is half the value of the maximum field of view) and the image height IH corresponding to the maximum field of view of the optical lens satisfy the following condition: IHm / IH ≤ 0.43.

[0069] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: f1 / f < -3.0. Satisfying this range not only allows light rays with a wide angle of view to enter the optical lens, achieving ultra-wide-angle characteristics, but also helps to control perspective distortion and reduce field curvature by using a larger negative focal length, thereby improving the geometric accuracy of the imaging plane.

[0070] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy the condition: f2 / f < -3.1. Satisfying this range allows some of the negative optical power to be shared by the first lens, which helps to allow light rays with a large field of view to enter the optical lens smoothly, thereby expanding the light-gathering range of the optical lens.

[0071] In some implementations, the effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy the condition: 5.2 < f3 / f. Meeting this range allows for the convergence of light rays while reducing the light deflection angle, resulting in a smoother transition of light path. It also balances various aberrations generated by the front lens, thereby improving the imaging quality of the optical lens.

[0072] In some implementations, the effective focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy the condition: 53.0 < f4 / f. Meeting this range can reduce the light deflection angle to ensure a smooth transition of light path, while also balancing various aberrations generated by the front lens and improving the imaging quality of the optical lens.

[0073] In some embodiments, the effective focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 3.6 < f5 / f. Meeting this range allows for the convergence and adjustment of light rays emitted from the fourth lens, reducing the tendency and degree of convergence of the light rays to transition smoothly. Simultaneously, it balances various aberrations generated by the front lens, improving the overall imaging quality of the optical lens.

[0074] In some embodiments, the effective focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy the condition: 2.7 < f6 / f. Meeting this range allows light to converge, and in conjunction with the negative lens of the seventh lens, it further reduces aberrations while ensuring that the light converges effectively and smoothly at the final point, allowing the light to reach the imaging plane smoothly.

[0075] In some implementations, the effective focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy the condition: f7 / f < -2.5. Meeting this range allows for light divergence, which helps to mitigate the light trajectory at the rear of the lens, achieving a long back focal length (BFL). It also disperses the central and peripheral rays in each field of view, increasing the relative illumination of the optical lens. Simultaneously, it facilitates the correction of aberrations in the peripheral and central rays, achieving high resolution. Furthermore, it ensures that the angle of light rays to the image plane meets the CRA requirement, achieving a small CRA and improving both resolution and illumination.

[0076] In some embodiments, the radius of curvature R3 of the object-side surface of the second lens satisfies the condition R3 / f < -4.0 with respect to the effective focal length f of the optical lens. Satisfying this range reduces the distance of the incident light from the optical axis, which is beneficial for reducing the front aperture of the lens and allowing the light to transition smoothly within the lens.

[0077] In some embodiments, the radius of curvature R6 of the image-side surface of the third lens satisfies the condition R6 / f < -4.2 with respect to the effective focal length f of the optical lens. Meeting this range allows for a reduction in the height of light rays within the lens, enabling miniaturization; it also ensures a smooth light path with minimal light refraction, effectively reducing light energy loss due to reflections between lenses and improving the relative illumination of the optical lens.

[0078] In some embodiments, the radius of curvature R9 of the object-side surface of the fifth lens and the effective focal length f of the optical lens satisfy: R9 / f < -54.0. Meeting this range allows for the reception and divergence of forward light rays. Light rays in the edge field of view will have a longer optical path after passing through the fifth lens than those in the center field of view, altering the light trajectory of the edge field of view. This facilitates defocus correction of edge field of view aberrations and achieves high resolution.

[0079] In some embodiments, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy the following condition: 0.5 < (R1-R2) / (R1+R2) < 0.95. Satisfying this range allows for the rapid divergence of large-angle light rays passing through the object-side surface of the first lens, and enables the collection of light rays with a large field of view into the rear lens, thus facilitating the achievement of a large field of view. Preferably, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy the following condition: 0.57 ≤ (R1-R2) / (R1+R2) ≤ 0.90.

[0080] In some embodiments, the radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R11 of the object-side surface of the sixth lens satisfy: (R10-R11) / (R10+R11) < -1.8. Meeting this range allows for light convergence, which helps reduce the aperture of the rear lens group and ensures a smooth transition of the light emitted from the fifth lens to the rear, thereby reducing sensitivity and improving resolution by minimizing aberrations. Simultaneously, the light emitted from the fifth lens is well received by the sixth lens, reducing light loss in each field of view and improving relative illumination in each field of view. Preferably, the radius of curvature R10 of the image-side surface of the fifth lens and the radius of curvature R11 of the object-side surface of the sixth lens satisfy: -2.85 ≤ (R10-R11) / (R10+R11) ≤ -2.07.

[0081] In some embodiments, the total optical length TTL of the optical lens and the sum of the center thicknesses of the first to seventh lenses along the optical axis, ∑CT, satisfy the condition: 0.5 < ∑CT / TTL < 0.75. Satisfying this range allows for a reduction in the total length of the optical lens, resulting in a more compact structure.

[0082] In one implementation, the first, second, third, fourth, fifth, sixth, and seventh lenses can be made entirely of glass or a combination of glass and plastic, both of which achieve good imaging results. In this application, to improve the image quality of the lens, at least one of the object-side or image-side surfaces of the first, second, third, fourth, and fifth lenses is aspherical. Aspherical lenses are characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike spherical lenses, which have a constant curvature from the lens center to the lens periphery, aspherical lenses have better curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism.

[0083] To achieve better optical performance, the lens employs multiple aspherical lenses, and the shapes of each aspherical surface of the optical lens satisfy the following equation:

[0084]

[0085] 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 A, B, C, D, E, F, and G are the second, fourth, sixth, eighth, tenth, twelfth, and fourteenth 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 shows a schematic of the structure of an optical lens provided in Embodiment 1 of the present invention. The optical lens includes, along the optical axis from the object side to the imaging surface S18, the following components in sequence: 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, a filter G1, and a protective glass G2.

[0089] Among them, the first lens L1 is a spherical lens with negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave; the second lens L2 is an aspherical lens with negative optical power, its object-side surface S3 is concave, and its image-side surface S4 is concave; the third lens L3 is an aspherical lens with positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex; the fourth lens L4 is an aspherical lens with positive optical power, its object-side surface S7 is concave, and its image-side surface S8 is convex; the fifth lens L5 is a spherical lens with positive optical power. The aspherical lens has the following properties: the object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex; the sixth lens L6 is a spherical lens with positive optical power, with both the object-side surface S11 and the image-side surface of the sixth lens being convex; the seventh lens L7 is a spherical lens with negative optical power, with both the object-side surface S13 and the image-side surface S14 of the seventh lens being concave, and the sixth lens L6 and the seventh lens L7 form a cemented lens with a cementing surface S12; the object-side surface S14 and the image-side surface S15 of the filter G1 are both planar; and the object-side surface S16 and the image-side surface S17 of the protective glass G2 are both planar.

[0090] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 1-1.

[0091] Table 1-1

[0092]

[0093]

[0094] The surface coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 1-2.

[0095] Table 1-2

[0096] Face number K A B C S3 -1.56E+00 0.00E+00 6.87E-04 -1.76E-05 S4 -7.30E-01 0.00E+00 -1.21E-03 8.84E-05 S5 8.64E+00 0.00E+00 -9.68E-04 8.43E-05 S6 -4.85E+00 0.00E+00 2.78E-04 -2.64E-04 S7 3.50E+01 0.00E+00 8.72E-03 -1.68E-03 S8 3.35E+01 0.00E+00 2.10E-02 3.22E-03 S9 -6.24E+01 0.00E+00 6.53E-03 2.84E-03 S10 -1.02E+00 0.00E+00 -5.53E-03 -6.46E-04 Face number D E F G S3 1.25E-08 1.32E-09 7.74E-11 -5.61E-13 S4 1.20E-05 4.00E-07 -2.51E-07 -1.97E-09 S5 -1.34E-05 7.81E-07 -2.45E-08 -5.79E-09 S6 2.32E-05 -5.37E-07 -2.14E-07 1.22E-08 S7 6.27E-04 1.40E-03 -6.40E-04 -2.77E-04 S8 -1.94E-04 -1.22E-05 -5.48E-05 -2.10E-05 S9 -1.85E-04 -4.11E-07 -1.09E-05 -6.22E-06 S10 -6.18E-07 -1.39E-05 5.75E-08 -2.94E-08

[0097] Figure 2 The distortion curve of Example 1 is shown, which represents the F-θ distortion at different field-of-view angles 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 value is controlled within the range of +24%, indicating that the optical lens has a large positive distortion.

[0098] Figure 3 The modulation transfer function (MTF) curve of Example 1 is shown, which represents the lens imaging modulation at different spatial frequencies in each field of view. The horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of this example is above 0.2 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.

[0099] Example 2

[0100] Please see Figure 4 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 2 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1 above, except that the curvature radius of each lens surface, the thickness of each lens, the aspherical coefficient of each lens and other parameters are different.

[0101] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 2-1.

[0102] Table 2-1

[0103]

[0104] The surface shape coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 2-2.

[0105] Table 2-2

[0106]

[0107]

[0108] Figure 5 , Figure 6The distortion curve and modulation transfer function (MTF) curve of Example 2 are shown respectively. As can be seen from the figures, the distortion value is controlled within the range of +24%, indicating that the optical lens has significant positive distortion. The MTF value of the optical lens is above 0.3 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, demonstrating good imaging quality and excellent detail resolution at both low and high frequencies.

[0109] Example 3

[0110] Please see Figure 7 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 3 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1 above, except that the curvature radius of each lens surface, the thickness of each lens, the aspherical coefficient of each lens and other parameters are different.

[0111] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 3-1.

[0112] Table 3-1

[0113]

[0114]

[0115] The surface shape coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 3-2.

[0116] Table 3-2

[0117] Face number K A B C S1 4.96E+01 0.00E+00 1.28E-04 -1.15E-07 S2 3.26E-01 0.00E+00 -6.14E-04 4.89E-06 S3 -3.83E+01 0.00E+00 4.05E-04 -4.26E-06 S4 -5.90E-01 0.00E+00 2.73E-03 -8.75E-05 S5 1.00E+02 0.00E+00 -1.52E-03 6.83E-07 S6 -3.29E+00 0.00E+00 -2.91E-04 -9.48E-05 S7 -5.89E+01 0.00E+00 7.58E-03 -2.03E-04 S8 -7.37E+01 0.00E+00 1.20E-02 1.42E-03 S9 -1.00E+02 0.00E+00 3.25E-03 8.21E-04 S10 -1.13E+00 0.00E+00 -2.38E-03 -2.74E-04 Face number D E F G S1 -2.50E-10 4.40E-13 7.37E-15 7.18E-18 S2 5.99E-08 -4.70E-10 -2.29E-11 2.02E-13 S3 1.74E-07 -7.69E-09 -1.78E-10 -1.21E-12 S4 -8.69E-06 6.82E-07 2.09E-07 1.41E-09 S5 -3.82E-06 6.48E-07 4.99E-08 4.57E-09 S6 1.10E-05 -7.70E-07 1.24E-07 2.01E-08 S7 1.62E-04 6.10E-05 -7.44E-05 2.36E-05 S8 6.29E-05 1.43E-05 5.91E-06 4.08E-07 S9 -1.08E-04 -1.12E-06 1.06E-08 8.87E-07 S10 -5.24E-06 -1.84E-06 -3.15E-08 -1.34E-08

[0118] Figure 8 , Figure 9 The distortion curve and modulation transfer function (MTF) curve of Example 3 are shown respectively. As can be seen from the figures, the distortion value is controlled within the range of +30%, indicating that the optical lens has significant positive distortion. The MTF value of the optical lens is above 0.3 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, demonstrating good imaging quality and excellent detail resolution at both low and high frequencies.

[0119] Example 4

[0120] Please see Figure 10 The figure shows a schematic diagram of the structure of the optical lens provided in Embodiment 4 of the present invention. The optical lens in this embodiment is roughly the same as that in Embodiment 1 above, except that the curvature radius of each lens surface, the thickness of each lens, the aspherical coefficient of each lens and other parameters are different.

[0121] Specifically, the design parameters of each lens in the optical lens provided in this embodiment are shown in Table 4-1.

[0122] Table 4-1

[0123]

[0124]

[0125] The surface shape coefficients of each aspherical surface of the optical lens in this embodiment are shown in Table 4-2.

[0126] Table 4-2

[0127] Face number K A B C S1 5.85E-01 0.00E+00 1.87E-04 -2.98E-07 S2 1.52E-02 0.00E+00 -1.52E-03 4.39E-06 S3 -3.80E+00 0.00E+00 1.15E-03 1.84E-05 S4 9.93E+01 0.00E+00 7.94E-04 -9.96E-05 S5 8.30E+01 0.00E+00 -1.60E-03 1.68E-05 S6 -6.02E+00 0.00E+00 2.84E-06 -2.78E-04 S7 4.77E+01 0.00E+00 5.90E-03 -8.59E-04 S8 1.00E+02 0.00E+00 1.30E-02 1.43E-03 S9 6.50E+01 0.00E+00 4.10E-03 1.35E-03 S10 -9.02E-01 0.00E+00 -2.54E-03 -2.32E-04 Face number D E F G S1 -1.12E-09 -3.87E-11 3.81E-13 -6.23E-16 S2 4.77E-06 -8.85E-08 4.57E-10 3.56E-10 S3 -5.02E-07 -5.21E-07 -1.44E-08 -4.39E-09 S4 -8.24E-06 -6.78E-07 -2.43E-07 1.74E-09 S5 2.85E-06 -1.42E-06 1.41E-07 -1.58E-08 S6 -2.40E-05 1.71E-05 1.02E-06 -4.46E-08 S7 2.84E-04 3.56E-04 -1.38E-04 -1.42E-04 S8 -2.08E-05 2.37E-04 -3.64E-05 1.41E-06 S9 -1.20E-05 5.82E-05 2.21E-05 1.27E-05 S10 -1.25E-05 -7.10E-06 3.90E-07 7.18E-08

[0128] Figure 11 , Figure 12 The distortion curve and modulation transfer function (MTF) curve of Example 4 are shown respectively. As can be seen from the figures, the distortion value is controlled within the range of +20%, indicating that the optical lens has significant positive distortion. The MTF value of the optical lens is above 0.2 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, demonstrating good imaging quality and detail resolution at both low and high frequencies.

[0129] Please refer to Table 5, which shows the optical characteristics of the optical lenses provided in the above four embodiments, including the effective focal length f, maximum field of view FOV, pupil diameter EPD, total optical length TTL, aperture value FNO, image height IH corresponding to the maximum field of view, principal ray incident angle CRA, optical back focal length BFL, true image height IHm corresponding to the center field of view (this value is half the value of the maximum field of view), and the values ​​corresponding to each conditional expression in each embodiment.

[0130] Table 5

[0131] Parameters and conditional expressions Example 1 Example 2 Example 3 Example 4 f(mm) 1.21 1.20 1.24 1.25 FOV (°) 190.00 190.00 170.00 160.00 EPD (mm) 0.60 0.59 0.61 0.57 TTL(mm) 29.42 29.31 27.31 26.02 FNO 2.03 2.03 2.03 2.20 IH(mm) 5.06 5.02 4.98 4.28 IHm(mm) 2.15 2.13 2.01 1.84 CRA(°) 18.05 17.92 11.16 11.97 BFL (mm) 2.53 2.52 2.94 2.48 TTL / f 24.24 24.33 21.95 20.80 TTL / IH 5.82 5.84 5.49 6.08 (IH / 2) / (f×θ) 1.26 1.26 1.35 1.22 FOV / FNO(°) 93.60 93.60 83.74 72.73 IH / f 4.17 4.17 4.00 3.42 BFL / f 2.08 2.09 2.36 1.98 IHm / IH 0.42 0.42 0.40 0.43 f1 / f -8.63 -8.38 -7.29 -3.31 f2 / f -3.48 -3.47 -3.94 -8.97 f3 / f 5.90 5.97 5.77 7.52 f4 / f 442.91 830.17 511.33 58.06 f5 / f 4.09 4.16 5.51 4.31 f6 / f 3.52 3.49 2.93 3.07 f7 / f -3.10 -3.13 -2.97 -2.72 (R1-R2) / (R1+R2) 0.57 0.58 0.90 0.87 R3 / f -25.35 -33.62 -40.19 -4.45 R6 / f -6.59 -6.75 -4.68 -5.55 R9 / f -63.31 -64.04 -111.27 -399.57 (R10-R11) / (R10+R11) -2.07 -2.14 -2.85 -2.32 ΣCT / TTL 0.59 0.60 0.53 0.70

[0132] In summary, the optical lens in this embodiment of the invention employs seven lenses with optical power. By rationally allocating the optical power of each lens, rationally matching the surface shape of each lens, rationally setting the thickness of each lens and the spacing between each lens, rationally setting the position of the aperture, and setting the optical lens to have a large positive distortion, a balance of large field of view (maximum FOV of 190°), large aperture (minimum FNO of 2.03), large image plane (maximum IH of 5.06mm) and high pixel count can be achieved, thereby meeting the usage requirements of automotive lenses.

[0133] 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.

[0134] 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 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 the present invention should be determined by the appended claims.

Claims

1. An optical lens comprising seven lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: The first lens with negative optical power has a convex object side and a concave image side. A second lens with negative optical power has a concave object side. The third lens with positive optical power has a convex image-side surface; A fourth lens with positive optical power; The fifth lens with positive optical power has a concave object side and a convex image side. The sixth lens has positive optical power, with both its object-side and image-side surfaces being convex. The seventh lens has negative optical power and its object side is concave. Wherein, the radius of curvature R10 of the image side of the fifth lens and the radius of curvature R11 of the object side of the sixth lens satisfy: -2.85≤(R10-R11) / (R10+R11)<-1.8; The total optical length TTL of the optical lens and the image height IH corresponding to the maximum field of view of the optical lens satisfy the following condition: 5.0 < TTL / IH < 6.

50.

2. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy the following condition: 18.0 < TTL / f < 26.

0.

3. The optical lens according to claim 1, characterized in that, The radius of curvature R10 of the image side of the fifth lens and the radius of curvature R11 of the object side of the sixth lens satisfy: -2.85≤(R10-R11) / (R10+R11)≤-2.07; The total optical length TTL of the optical lens and the image height IH corresponding to the maximum field of view of the optical lens satisfy the following condition: 5.49≤TTL / IH≤6.

08.

4. The optical lens according to claim 1, characterized in that, The image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half field of view of the optical lens satisfy: 1.20<(IH / 2) / (f×θ)≤1.

35.

5. The optical lens according to claim 1, characterized in that, The maximum field of view (FOV) of the optical lens and the aperture value (FNO) of the optical lens satisfy the following condition: 70° < FOV / FNO < 95°.

6. The optical lens according to claim 1, characterized in that, The image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy the following condition: 3.2 < IH / f ≤ 4.

17.

7. The optical lens according to claim 1, characterized in that, The optical back focal length (BFL) of the optical lens and the effective focal length (f) of the optical lens satisfy the following condition: 1.5 < BFL / f ≤ 2.

36.

8. The optical lens according to claim 1, characterized in that, The true image height IHm corresponding to the center field of view of the optical lens and the image height IH corresponding to the maximum field of view of the optical lens satisfy the following condition: 0.4 ≤ IHm / IH < 0.

49.

9. The optical lens according to claim 1, characterized in that, The effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -8.63≤f1 / f<-3.

0.

10. The optical lens according to claim 1, characterized in that, The effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -8.97≤f2 / f<-3.

1.

11. The optical lens according to claim 1, characterized in that, The effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy the following condition: 5.2 < f3 / f ≤ 7.

52.

12. The optical lens according to claim 1, characterized in that, The effective focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 53.0 < f4 / f.

13. The optical lens according to claim 1, characterized in that, The radius of curvature R3 of the object side of the second lens and the effective focal length f of the optical lens satisfy: R3 / f < -4.

0.

14. The optical lens according to claim 1, characterized in that, The radius of curvature R6 of the image side of the third lens and the effective focal length f of the optical lens satisfy: R6 / f < -4.

2.

15. The optical lens according to claim 1, characterized in that, The radius of curvature R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: R9 / f < -54.

0.

16. The optical lens according to claim 1, characterized in that, The radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy: 0.5 < (R1-R2) / (R1+R2) < 0.

95.

17. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the sum of the center thicknesses of the first lens to the seventh lens along the optical axis, ∑CT, satisfy the condition: 0.5 < ∑CT / TTL < 0.75.

Images