Optical lens

Abstract

This application discloses an optical lens, which comprises, along the optical axis from the object side to the image side, the following components in sequence: a first lens with negative optical power, having a convex object side and a concave image side; a second lens with negative optical power, having a convex object side and a concave image side; a third lens with negative optical power, having a concave image side; a fourth lens with positive optical power, having a convex object side and a concave image side; a fifth lens with positive optical power, having a convex object side and a convex image side; a sixth lens with positive optical power, having a concave object side and a convex image side; a seventh lens with negative optical power, having a concave object side and a concave image side; an eighth lens with positive optical power, having a convex object side and a convex image side; and a ninth lens with positive optical power, having a concave object side and a convex image side. The combined focal length Fb of the first to fourth lenses and the effective focal length F of the optical lens satisfy: -3.0 ≤ Fb / F ≤ -1.5.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical lens. Background Technology

[0002] With increasing cross-regional collaborative work, video conferencing systems have become an indispensable part of modern productivity. As a crucial component of the image information acquisition subsystem, video conferencing lenses can capture and image data to meet various requirements during meetings, including image quality, clarity, and stability. Throughout their development, video conferencing lenses have undergone continuous iteration and upgrades. Wide field of view, high-definition images, low distortion, and no deformation have become increasingly sought-after features.

[0003] Imaging lenses are indispensable and crucial components in video conferencing, and their image quality determines the upper limit of the video conference image. However, with the increase of the viewing angle, the distortion of existing imaging lenses also increases, resulting in significant distortion of human images. Therefore, designing a lens with a wide field of view and no distortion has become an urgent problem to be solved. Summary of the Invention

[0004] This application provides an optical lens, which comprises, along the optical axis from the object side to the image side, the following 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 convex and the image side is concave; a third lens with negative optical power, wherein the image side is concave; a fourth lens with positive optical power, wherein the object side is convex and the image side is concave; a fifth lens with positive optical power, wherein the object side is convex and the image side is convex; and a sixth lens with positive optical power. The sixth lens has a concave object-side surface and a convex image-side surface; the seventh lens has a negative optical power, with both its object-side and image-side surfaces being concave; the eighth lens has a positive optical power, with both its object-side and image-side surfaces being convex; and the ninth lens has a positive optical power, with both its object-side and image-side surfaces being concave. The combined focal length Fb of the first, second, third, and fourth lenses satisfies the effective focal length F of the optical lens as follows: -3.0 ≤ Fb / F ≤ -1.5.

[0005] In one embodiment, the effective focal length F1 of the first lens and the effective focal length F of the optical lens satisfy: -18.7≤F1 / F≤-12.1.

[0006] In one embodiment, the effective focal length F2 of the second lens and the effective focal length F of the optical lens satisfy: -2.7≤F2 / F≤-2.4.

[0007] In one embodiment, the effective focal length F3 of the third lens and the effective focal length F of the optical lens satisfy: -4.0≤F3 / F≤-3.1.

[0008] In one embodiment, the effective focal length F4 of the fourth lens and the effective focal length F of the optical lens satisfy: 3.0≤F4 / F≤3.7.

[0009] In one embodiment, the effective focal length F5 of the fifth lens and the effective focal length F of the optical lens satisfy: 1.9≤F5 / F≤2.3.

[0010] In one embodiment, the effective focal length F6 of the sixth lens and the effective focal length F of the optical lens satisfy: 2.3≤F6 / F≤6.1.

[0011] In one embodiment, the effective focal length F7 of the seventh lens and the effective focal length F of the optical lens satisfy: -2.0≤F7 / F≤-1.1.

[0012] In one embodiment, the effective focal length F8 of the eighth lens and the effective focal length F of the optical lens satisfy: 2.4≤F8 / F≤3.5.

[0013] In one embodiment, the effective focal length F9 of the ninth lens and the effective focal length F of the optical lens satisfy: 6.8≤F9 / F≤15.7.

[0014] In one embodiment, the combined focal length Fa of the sixth and seventh lenses satisfies the condition that -3.2 ≤ Fa / F ≤ -2.2 with respect to the effective focal length F of the optical lens.

[0015] In one embodiment, the combined focal length Fc of the fifth, sixth, seventh, eighth, and ninth lenses satisfies the effective focal length F of the optical lens: 2.4 ≤ Fc / F ≤ 2.8.

[0016] In one embodiment, the distance BFL from the center of the image side of the ninth lens to the center of the imaging surface of the optical lens satisfies the following condition with respect to the effective focal length F of the optical lens: 1.6 ≤ BFL / F ≤ 1.8.

[0017] In one embodiment, the center thickness D1 of the first lens on the optical axis and the effective focal length F1 of the first lens satisfy: -0.1≤D1 / F1≤0.

[0018] In one embodiment, the effective focal length F3 of the third lens and the radius of curvature R31 of the object side surface of the third lens satisfy: -0.8≤F3 / R31≤0.1.

[0019] In one embodiment, the effective focal length F of the optical lens and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0 ≤ F / TTL ≤ 0.1.

[0020] In one embodiment, the distance D59 from the center of the object side of the fifth lens to the center of the image side of the ninth lens and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy: 0.2≤D59 / TTL≤0.4.

[0021] In another aspect, this application provides an electronic device. This electronic device includes an optical lens according to this application and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0022] This application employs nine lenses. By optimizing the shape, optical power, and related parameters of each lens, the optical lens achieves at least one beneficial effect, such as a large field of view, low distortion, miniaturization, low sensitivity, and high-definition image. Attached Figure Description

[0023] Other features, objects, and advantages of this utility application will become more apparent from the following detailed description of the embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0024] Figure 1 This is a schematic diagram illustrating the structure of an optical lens according to Embodiment 1 of this application;

[0025] Figure 2 To illustrate the distortion curve of the optical lens according to Embodiment 1 of this application;

[0026] Figure 3 To illustrate the structure of the optical lens according to Embodiment 2 of this application;

[0027] Figure 4 To illustrate the distortion curve of the optical lens according to Embodiment 2 of this application;

[0028] Figure 5 To illustrate the structure of the optical lens according to Embodiment 3 of this application;

[0029] Figure 6 To illustrate the distortion curve of the optical lens according to Embodiment 3 of this application;

[0030] Figure 7 This is a schematic diagram illustrating the structure of the optical lens according to Embodiment 4 of this application;

[0031] Figure 8 To illustrate the distortion curve of the optical lens according to Embodiment 4 of this application;

[0032] Figure 9 To illustrate the structural schematic diagram of the optical lens according to Embodiment 5 of this application; and

[0033] Figure 10 To illustrate the distortion curve of the optical lens according to Embodiment 5 of this application. Detailed Implementation

[0034] To facilitate understanding of this application, a more complete description of the application will be provided below with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the 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.

[0035] 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 this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0036] 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.

[0037] 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 side is called the image-side surface of the lens.

[0038] 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.

[0039] 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 a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0040] 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.

[0041] The features, principles and other aspects of this application are described in detail below.

[0042] In an exemplary embodiment, the optical lens includes, for example, nine lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens. These nine lenses are arranged sequentially along the optical axis from the object side to the image side.

[0043] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the image side of the ninth lens. Optionally, the photosensitive element disposed on the image side of the ninth lens may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).

[0044] In an exemplary embodiment, an aperture stop may be provided between the fourth and fifth lenses to limit the light beam and further improve the imaging quality of the optical lens. The aperture stop helps to concentrate the light entering the optical lens, reduce the maximum aperture of the optical lens, and decrease the system's assembly sensitivity. In this embodiment, the aperture stop may be located between the fourth and fifth lenses, near the object side of the fifth lens. However, it should be noted that the location of the aperture stop disclosed herein is merely an example and not a limitation; in alternative embodiments, the aperture stop may be located at other positions as needed.

[0045] In an exemplary embodiment, the sixth lens and the seventh lens form a cemented lens, with the image-side surface of the sixth lens cemented together with the object-side surface of the seventh lens. The cemented lens configuration of the sixth and seventh lenses is advantageous for correcting chromatic aberration and achieving better tolerance sensitivity.

[0046] In an exemplary embodiment, the first lens has negative optical power, with its object-side surface being convex and its image-side surface being concave. The negative optical power and convex object-side surface of the first lens allow it to collect as much light as possible from a large field of view into the rear optical system, effectively increasing light transmission and fixing the direction of large-angle light rays at the edges. Simultaneously, the concave image-side surface of the first lens prevents excessive divergence of object-side light, which is beneficial for controlling the aperture of the rear lenses.

[0047] In an exemplary embodiment, the second lens has negative optical power, with its object-side surface being convex and its image-side surface being concave. The negative optical power and convex object-side surface of the second lens effectively collect light rays entering through the first lens, preventing excessive divergence of the object-side light. Simultaneously, the concave image-side surface of the second lens allows for smoother light rays exiting from the second lens, which is beneficial for controlling the aperture of the rear lens.

[0048] In an exemplary embodiment, the first lens and the second lens are both designed as meniscus lenses with negative optical power. When combined, they can make the outgoing light rays smoother, which is beneficial for achieving small distortion.

[0049] In an exemplary embodiment, the third lens has negative optical power, with its object-side surface being either convex or concave, and its image-side surface being concave. This configuration of the third lens allows it to receive large-angle light rays transmitted from the first and second lenses and then diverge them to the rear lens.

[0050] In an exemplary embodiment, the fourth lens has positive optical power, with its object-side surface being convex and its image-side surface being concave. This configuration of the fourth lens can effectively converge light rays, and together with the third lens having negative optical power, it facilitates the smooth entry of light rays into the rear lenses, thereby improving resolution.

[0051] In an exemplary embodiment, the first four lenses (i.e., the first to the fourth lenses) are all convex on the object side and concave on the image side, which helps to balance the distortion they bring.

[0052] In an exemplary embodiment, the fifth lens has positive optical power, with both its object-side and image-side surfaces being convex. This configuration of the fifth lens facilitates light convergence; simultaneously, the biconvex shape of the fifth lens compresses the angle of the incident light rays, allowing for a smooth transition of light and enabling diverging light rays to smoothly enter the rear, further smoothing the light path and improving image quality.

[0053] In an exemplary embodiment, the sixth lens has positive optical power, with a concave object side and a convex image side. This configuration of the sixth lens facilitates light convergence; designing the sixth lens to have positive optical power, in conjunction with a seventh lens having negative optical power, allows light to enter the rear lenses more smoothly, further reducing field curvature and correcting off-axis point aberrations of the system.

[0054] In an exemplary embodiment, the seventh lens has negative optical power, with both its object-side and image-side surfaces being concave. This configuration of the seventh lens facilitates the collection of incident light rays, enabling smooth light transitions and improving resolution.

[0055] In an exemplary embodiment, the eighth lens has positive optical power, with both its object-side and image-side surfaces being convex. This configuration of the eighth lens can further reduce aberrations, improve image quality, and optimize distortion; at the same time, it allows light to converge effectively and smoothly in the rear, ensuring that the light reaches the imaging plane smoothly and meets imaging requirements.

[0056] In an exemplary embodiment, the ninth lens has positive optical power, with a concave object-side surface and a convex image-side surface. This configuration of the ninth lens facilitates the collection of light incident through the eighth lens, allowing for a smooth transition of light and improving resolution. Designing the image-side surface of the ninth lens as convex makes it less likely for light rays from the imaging plane to return to the imaging plane, thereby reducing the energy of ghost images on the imaging plane and minimizing interference with image quality.

[0057] In an exemplary embodiment, the ninth lens is a freeform surface lens, which can better correct edge distortion and make the distortion value of the entire optical lens as low as 0.5%.

[0058] In an exemplary embodiment, the optical lens according to this application satisfies: -3.0 ≤ Fb / F ≤ -1.5, where Fb is the combined focal length of the first lens, second lens, third lens, and fourth lens, and F is the effective focal length of the optical lens. Satisfying -3.0 ≤ Fb / F ≤ -1.5 helps to balance the various aberrations generated by the first four lenses, reduce distortion, and improve image quality.

[0059] In an exemplary embodiment, the optical lens according to this application can satisfy -18.7≤F1 / F≤-12.1, where F1 is the effective focal length of the first lens and F is the effective focal length of the optical lens. Satisfying -18.7≤F1 / F≤-12.1 can optimize the optical power of the first lens, which is beneficial for light rays with a large field of view to enter the optical lens.

[0060] In an exemplary embodiment, the optical lens according to this application satisfies: -2.7 ≤ F2 / F ≤ -2.4, where F2 is the effective focal length of the second lens and F is the effective focal length of the optical lens. Satisfying -2.7 ≤ F2 / F ≤ -2.4 optimizes the optical power of the second lens, assists the incident light rays to enter the optical lens smoothly, and helps to effectively correct astigmatism and distortion to improve image quality.

[0061] In an exemplary embodiment, the optical lens according to this application satisfies: -4.0 ≤ F3 / F ≤ -3.1, where F3 is the effective focal length of the third lens and F is the effective focal length of the optical lens. Satisfying -4.0 ≤ F3 / F ≤ -3.1 optimizes the optical power of the third lens, assists the incident light rays to enter the optical lens smoothly, and is beneficial to effectively correct astigmatism and distortion to improve image quality.

[0062] In an exemplary embodiment, the optical lens according to this application satisfies: 3.0 ≤ F4 / F ≤ 3.7, where F4 is the effective focal length of the fourth lens and F is the effective focal length of the optical lens. Satisfying 3.0 ≤ F4 / F ≤ 3.7 is beneficial for light convergence, allowing divergent light rays entering the system to smoothly enter the rear optical system, resulting in a smoother overall optical path, optimized aberrations, and improved resolution.

[0063] In an exemplary embodiment, the optical lens according to this application satisfies: 1.9 ≤ F5 / F ≤ 2.3, where F5 is the effective focal length of the fifth lens and F is the effective focal length of the optical lens. Satisfying 1.9 ≤ F5 / F ≤ 2.3 allows control over the light path between the fourth and sixth lenses, reducing aberrations caused by large-angle light rays entering through the fourth lens, while also making the inter-lens structure more compact, which is beneficial for miniaturization.

[0064] In an exemplary embodiment, the optical lens according to this application satisfies: 2.3 ≤ F6 / F ≤ 6.1, where F6 is the effective focal length of the sixth lens and F is the effective focal length of the optical lens. Satisfying 2.3 ≤ F6 / F ≤ 6.1 helps the light to transition smoothly, which is beneficial for correcting chromatic aberration and improving image quality.

[0065] In an exemplary embodiment, the optical lens according to this application satisfies: -2.0 ≤ F7 / F ≤ -1.1, where f6 is the focal length of the sixth lens and f is the total focal length of the optical lens. Satisfying -2.0 ≤ F7 / F ≤ -1.1 helps the light to transition smoothly, which is beneficial for correcting chromatic aberration and improving image quality.

[0066] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 2.4 ≤ F8 / F ≤ 3.5, where F8 is the effective focal length of the eighth lens and F is the effective focal length of the optical lens. Satisfying 2.4 ≤ F8 / F ≤ 3.5 facilitates the smooth entry of more light into the rear optical system, thereby improving illumination.

[0067] In an exemplary embodiment, the optical lens according to this application satisfies: 6.8 ≤ F9 / F ≤ 15.7, where F is the effective focal length of the optical lens and R1 is the radius of curvature of the object-side surface of the first lens. Satisfying 6.8 ≤ F9 / F ≤ 15.7 controls the focal length of the ninth lens within a certain range, which is beneficial for achieving rapid focusing of light onto the imaging plane, avoiding upward beams of light, reducing the rear aperture, and simultaneously improving light collection and ensuring sufficient light transmission.

[0068] In an exemplary embodiment, the optical lens according to this application satisfies: -3.2 ≤ Fa / F ≤ -2.2, where Fa is the combined focal length of the sixth and seventh lenses, and F is the effective focal length of the optical lens. Satisfying -3.2 ≤ Fa / F ≤ -2.2 allows for the reduction of aberrations caused by large-angle light rays entering through the fifth lens by controlling the light path between the fifth and eighth lenses; simultaneously, the arrangement of the sixth and seventh lenses as a cemented lens helps correct chromatic aberration.

[0069] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 2.4 ≤ Fc / F ≤ 2.8, where Fc is the combined focal length of the fifth, sixth, seventh, eighth, and ninth lenses, and F is the effective focal length of the optical lens. Satisfying 2.4 ≤ Fc / F ≤ 2.8 ensures that light passing through the rear lens group transitions smoothly to the imaging plane, reducing sensitivity.

[0070] In an exemplary embodiment, the optical lens according to this application satisfies: 1.6 ≤ BFL / F ≤ 1.8, where BFL is the distance from the center of the image-side surface of the ninth lens to the center of the imaging surface of the optical lens, and F is the effective focal length of the optical lens. Satisfying 1.6 ≤ BFL / F ≤ 1.8 enables the optical lens to have a long back focal length while achieving miniaturization, and also helps to reduce the energy of ghost images generated by reflections from the center of the optical lens and the filter.

[0071] In an exemplary embodiment, the optical lens according to this application satisfies: -0.1≤D1 / F1≤0, where D1 is the center thickness of the first lens on the optical axis, and F1 is the effective focal length of the first lens. Satisfying -0.1≤D1 / F1≤0 gives the optical lens the characteristics of a large field of view, low sensitivity, and miniaturization. It also enables better aberration correction and improved image quality.

[0072] In an exemplary embodiment, the optical lens according to this application satisfies: -0.8≤F3 / R31≤0.1, where F3 is the effective focal length of the third lens and R31 is the radius of curvature of the object-side surface of the third lens. Satisfying -0.8≤F3 / R31≤0.1 ensures that the optical lens has the characteristic of small distortion and can effectively reduce the imaging distortion caused by distortion.

[0073] In an exemplary embodiment, the optical lens according to this application satisfies: 0 ≤ F / TTL ≤ 0.1, where TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging surface of the optical lens, and F is the effective focal length of the optical lens. Satisfying 0 ≤ F / TTL ≤ 0.1 can effectively limit the length of the lens, which is beneficial for miniaturization.

[0074] In an exemplary embodiment, the optical lens according to this application satisfies: 0.2≤D59 / TTL≤0.4, where D59 is the distance from the center of the object-side surface of the fifth lens to the center of the image-side surface of the ninth lens, and TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging plane of the optical lens. Satisfying 0.2≤D59 / TTL≤0.4 allows for reasonable control of lens thickness and spacing, resulting in a compact lens structure and facilitating miniaturization.

[0075] In an exemplary embodiment, the optical lens of this application has the characteristic of a large field of view, with a maximum field of view of up to 130°, which is beneficial for the optical lens to achieve wide-angle characteristics, thereby enabling the acquisition of more scene information.

[0076] In an exemplary embodiment, the optical lens of this application satisfies the wide-angle characteristic while achieving a minimum distortion value of 0.5%, ensuring the authenticity of the image.

[0077] In an exemplary embodiment, the optical lens of this application may, as needed, include a filter and / or protective glass disposed between the ninth lens and the imaging surface to filter light of different wavelengths and prevent damage to the image-side elements (e.g., chips) of the optical lens.

[0078] In an exemplary embodiment, the first to ninth lenses can be spherical lenses or aspherical lenses. This application does not specifically limit the number of spherical and aspherical lenses; when image quality is a primary concern, the number of aspherical lenses can be increased, and even all lenses can be aspherical. Aspherical lenses are characterized by a continuously changing curvature from the lens center to the periphery. Unlike spherical lenses, which have a constant curvature from the lens center to the periphery, aspherical lenses have better radius of curvature characteristics, offering advantages in improving distortion aberrations and astigmatism. Using aspherical lenses can eliminate aberrations that occur during imaging as much as possible, thereby improving the image quality of the lens. Optionally, at least one of the object-side and image-side surfaces of each of the first to ninth lenses is an aspherical mirror surface.

[0079] In an exemplary embodiment, the first lens, the fifth lens, the sixth lens, and the seventh lens are spherical lenses; the object-side surface and the image-side surface of each of the second lens, the third lens, the fourth lens, the eighth lens, and the ninth lens are aspherical lenses. Exemplarily, the third lens or the ninth lens in the optical lens of this application is a freeform surface lens.

[0080] The optical lens of this application can employ freeform surface lenses. In wide-angle lenses, due to the limitations of rotationally symmetric lenses in correcting aberrations, distortion increases with the increase of the field of view. However, freeform surface lenses, by increasing the degree of freedom of asymmetry, can better correct aberrations such as distortion, achieving wide-angle and low-distortion performance. This application, through the reasonable design of the freeform surface, combined with its surface shape and materials, ensures that the lens can better correct the system's edge distortion values ​​and balance various aberrations without increasing the number of lens elements or the overall length, while simultaneously meeting the high performance requirements of wide-angle and low-distortion.

[0081] However, those skilled in the art will understand that the number of lenses constituting the lens can be varied to obtain the various results and advantages described in this specification without departing from the technical solutions claimed in this application. For example, although nine lenses are described as an example in the embodiments, the optical lens is not limited to including nine lenses. If desired, the optical lens may also include other numbers of lenses. Specific embodiments of the optical lens applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0082] Example 1

[0083] The following is for reference Figure 1 An optical lens according to Embodiment 1 of this application is described. Figure 1 A schematic diagram of the structure of an optical lens according to Embodiment 1 of this application is shown.

[0084] like Figure 1 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9.

[0085] The first lens L1 has negative optical power, with its object side S1 being convex and its image side S2 being concave.

[0086] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0087] The third lens L3 has negative optical power, with its object side S5 being convex and its image side S6 being concave.

[0088] The fourth lens L4 has positive optical power, with its object side S7 being convex and its image side S8 being concave.

[0089] The fifth lens L5 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0090] The sixth lens L6 has positive optical power, with its object side S12 being concave and its image side S13 being convex.

[0091] The seventh lens L7 has negative optical power, and its object side S13 is concave, and its image side S14 is concave.

[0092] The eighth lens L8 has positive optical power, and its object side S15 is convex, and its image side S16 is convex.

[0093] The ninth lens L9 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex.

[0094] The optical lens may also include an aperture stop STO, which may be positioned between the fourth lens L4 and the fifth lens L5 to improve image quality.

[0095] Optionally, the optical lens may also include a filter CG having an object-side surface S19 and an image-side surface S20 and / or a protective glass (not shown) having both an object-side surface and an image-side surface. The filter CG and / or the protective glass can be used to correct color aberrations, and can also be used to protect the image sensor chip IMA located at the imaging surface. Light from the object passes sequentially through each surface S1 to S20 and is finally imaged onto the imaging surface.

[0096] Table 1-1 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens in the optical lens of Example 1, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0097]

[0098] Table 1-1

[0099] In Example 1, the first, fifth, sixth, and seventh lenses are spherical mirrors. The object-side and image-side surfaces of any one of the second, third, fourth, eighth, and ninth lenses are aspherical. Specifically, the second, third, fourth, and eighth lenses are conventional aspherical lenses, and the surface shape x of each conventional aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0100]

[0101] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface.

[0102] The object-side and image-side surfaces of the ninth lens are freeform surfaces, more specifically, extended polynomial surfaces. The extended polynomial surface type supports a base quadratic aspheric surface plus a polynomial aspheric surface. The surface type sag is defined as:

[0103]

[0104] Where N is the total number of polynomial coefficients in the series, and Ai is the coefficient of the i-th extended polynomial. This polynomial is simply a power series in the x and y directions. The first term is x, then y, followed by x*x, x*y, y*y, and so on. There are 2 terms of degree 1, 3 terms of degree 2, 4 terms of degree 3, and so on, with the highest degree being 20, making the maximum total number of aspherical coefficients of the polynomial 230. The data values ​​at positions such as x and y are divided by a normalized radius to obtain a dimensionless polynomial coefficient.

[0105] Table 1-2 below shows the higher-order term coefficients A4, A6, A8, and A6 that can be used for the conventional aspherical mirrors S3-S8 and S15-S16 in Example 1. 10 A 12 A 14 and A 16 .

[0106] Face number k A4 A6 A8 A10 A12 A14 A16 S3 0.00 4.48E-03 -2.90E-04 1.32E-05 -3.29E-07 3.79E-09 0.00E+00 0.00E+00 S4 -0.91 -2.27E-03 2.25E-03 -4.70E-04 4.06E-05 -1.66E-06 0.00E+00 0.00E+00 S5 1.86 -4.07E-02 8.16E-03 -1.00E-03 6.85E-05 -1.73E-06 -4.21E-08 1.46E-09 S6 0.02 -3.28E-02 1.04E-02 -2.15E-03 8.20E-05 2.37E-05 7.96E-08 -1.12E-07 S7 0.20 7.40E-03 -4.59E-04 -2.81E-04 -6.37E-05 2.02E-05 2.99E-06 -4.25E-07 S8 -8.22 1.76E-02 -3.94E-03 7.03E-03 -7.30E-03 2.94E-03 4.54E-03 -3.60E-03 S15 -5.02 -5.45E-03 2.71E-04 1.77E-05 1.39E-05 7.19E-07 -8.00E-08 -1.49E-08 S16 -0.94 8.85E-04 -1.13E-04 7.33E-05 -9.25E-06 2.71E-06 -1.82E-07 2.16E-08

[0107] Table 1-2 and Table 1-3 below give the coefficients of higher-order terms that can be used in the extended polynomial surface S17 and S18 in Example 1.

[0108] Face number k X4Y0 X2Y2 X0Y4 X6Y0 X4Y2 X2Y4 X0Y6 S17 2.88 -1.06E-01 -2.06E-01 -8.08E-02 9.79E-01 3.03E+00 2.93E+00 9.46E-01 S18 2.58 -1.11E-01 -2.11E-01 -8.52E-02 1.05E+00 3.17E+00 3.01E+00 9.90E-01 Face number X8Y0 X6Y2 X4Y4 X2Y6 X0Y8 X10Y0 X8Y2 X6Y4 S17 -4.67E-02 -2.34E-01 -2.44E-01 -9.83E-03 -2.75E-02 -2.06E-01 -1.07E+00 -1.92E+00 S18 -5.67E-01 -2.14E+00 -3.15E+00 -1.54E+00 -5.13E-01 -5.37E-01 2.55E+00 5.41E+00 Face number X4Y6 X2Y8 X0Y10 S17 -2.56E+00 -1.07E+00 -1.88E-01 S18 4.75E+00 1.86E+00 6.09E-01

[0109] Table 1-3

[0110] In this embodiment, the maximum field of view (FOV) of the optical lens is 130°, and the absolute value of optical distortion is 0.6%. Figure 2 The distortion curve of the optical lens of Embodiment 1 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figure 2 It can be seen that the optical lens given in Example 1 can achieve good imaging quality.

[0111] Example 2

[0112] The following is for reference Figure 3An optical lens according to Embodiment 2 of this application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. Figure 3 A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown.

[0113] like Figure 3 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9.

[0114] The first lens L1 has negative optical power, with its object side S1 being convex and its image side S2 being concave.

[0115] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0116] The third lens L3 has negative optical power, with its object side S5 being convex and its image side S6 being concave.

[0117] The fourth lens L4 has positive optical power, with its object side S7 being convex and its image side S8 being concave.

[0118] The fifth lens L5 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0119] The sixth lens L6 has positive optical power, with its object side S12 being concave and its image side S13 being convex.

[0120] The seventh lens L7 has negative optical power, and its object side S13 is concave, and its image side S14 is concave.

[0121] The eighth lens L8 has positive optical power, and its object side S15 is convex, and its image side S16 is convex.

[0122] The ninth lens L9 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex.

[0123] The optical lens may also include an aperture stop STO, which may be positioned between the fourth lens L4 and the fifth lens L5 to improve image quality.

[0124] Optionally, the optical lens may also include a filter CG having an object-side surface S19 and an image-side surface S20 and / or a protective glass (not shown) having both an object-side surface and an image-side surface. The filter CG and / or the protective glass can be used to correct color aberrations, and can also be used to protect the image sensor chip IMA located at the imaging surface. Light from the object passes sequentially through each surface S1 to S20 and is finally imaged onto the imaging surface.

[0125] Table 2-1 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens in the optical lens of Example 2, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0126]

[0127]

[0128] Table 2-1

[0129] In Example 2, the first, fifth, sixth, and seventh lenses are spherical mirrors. The object-side and image-side surfaces of any one of the second, third, fourth, eighth, and ninth lenses are aspherical. Specifically, the second, third, fourth, and eighth lenses are conventional aspherical lenses, and the ninth lens is a freeform surface, more specifically, an extended polynomial surface. Table 2-2 shows the higher-order coefficients applicable to each conventional aspherical mirror in Example 2, wherein each conventional aspherical surface can be defined by formula (1) given in Example 1 above. Table 2-3 shows the higher-order coefficients applicable to each freeform surface in Example 2, wherein each extended polynomial surface can be defined by formula (2) given in Example 1 above.

[0130] Face number k A4 A6 A8 A10 A12 A14 A16 S3 0.00 5.36E-03 -3.16E-04 1.39E-05 -3.38E-07 3.91E-09 0.00E+00 0.00E+00 S4 -0.89 -2.49E-03 2.34E-03 -4.65E-04 4.13E-05 -1.61E-06 0.00E+00 0.00E+00 S5 3.52 -4.00E-02 8.12E-03 -1.01E-03 6.91E-05 -1.71E-06 -4.69E-08 1.46E-09 S6 -0.21 -3.22E-02 1.04E-02 -2.24E-03 1.09E-04 2.37E-05 7.96E-08 -1.12E-07 S7 0.01 6.30E-03 -7.93E-04 -2.07E-04 -7.88E-05 2.02E-05 2.99E-06 -4.25E-07 S8 -19.53 1.75E-02 -4.22E-03 6.69E-03 -7.24E-03 2.94E-03 4.54E-03 -3.60E-03 S15 -6.21 -3.57E-03 7.67E-04 1.39E-05 7.00E-06 7.19E-07 -8.00E-08 -1.49E-08 S16 0.22 2.00E-04 6.72E-04 2.01E-04 -2.46E-05 2.71E-06 -1.82E-07 2.16E-08

[0131] Table 2-2

[0132] Face number k X4Y0 X2Y2 X0Y4 X6Y0 X4Y2 X2Y4 X0Y6 S17 154.75 -2.62E-01 -5.34E-01 -2.43E-01 2.11E+00 6.50E+00 6.21E+00 2.02E+00 S18 3.24 -2.01E-01 -4.27E-01 -1.75E-01 2.75E+00 8.52E+00 8.04E+00 2.52E+00 Face number X8Y0 X6Y2 X4Y4 X2Y6 X0Y8 X10Y0 X8Y2 X6Y4 S17 -8.77E-01 -3.61E+00 -4.61E+00 -3.20E+00 -6.46E-01 -1.81E-01 -1.09E+00 -8.11E-01 S18 -3.18E+00 -1.19E+01 -1.94E+01 -9.74E+00 -2.49E+00 7.38E+00 3.50E+01 8.10E+01 Face number X4Y6 X2Y8 X0Y10 S17 -5.18E+00 -4.09E-01 1.35E-01 S18 6.72E+01 3.00E+01 9.18E+00

[0133] Table 2-3

[0134] In this embodiment, the maximum field of view (FOV) of the optical lens is 130°, and the absolute value of optical distortion is 0.5%. Figure 4 The distortion curve of the optical lens of Embodiment 2 is shown, representing the distortion magnitude corresponding to different image heights. According to... Figure 4 It can be seen that the optical lens given in Example 2 can achieve good imaging quality.

[0135] Example 3

[0136] The following is for reference Figure 5 An optical lens according to Embodiment 3 of this application is described. Figure 5 A schematic diagram of the structure of an optical lens according to Embodiment 3 of this application is shown.

[0137] like Figure 5As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9.

[0138] The first lens L1 has negative optical power, with its object side S1 being convex and its image side S2 being concave.

[0139] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0140] The third lens L3 has negative optical power, with its object side S5 being convex and its image side S6 being concave.

[0141] The fourth lens L4 has positive optical power, with its object side S7 being convex and its image side S8 being concave.

[0142] The fifth lens L5 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0143] The sixth lens L6 has positive optical power, with its object side S12 being concave and its image side S13 being convex.

[0144] The seventh lens L7 has negative optical power, and its object side S13 is concave, and its image side S14 is concave.

[0145] The eighth lens L8 has positive optical power, and its object side S15 is convex, and its image side S16 is convex.

[0146] The ninth lens L9 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex.

[0147] The optical lens may also include an aperture stop STO, which may be positioned between the fourth lens L4 and the fifth lens L5 to improve image quality.

[0148] Optionally, the optical lens may also include a filter CG having an object-side surface S19 and an image-side surface S20 and / or a protective glass (not shown) having both an object-side surface and an image-side surface. The filter CG and / or the protective glass can be used to correct color aberrations, and can also be used to protect the image sensor chip IMA located at the imaging surface. Light from the object passes sequentially through each surface S1 to S20 and is finally imaged onto the imaging surface.

[0149] Table 3-1 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens in the optical lens of Example 3, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0150]

[0151]

[0152] Table 3-1

[0153] In Example 3, the first, fifth, sixth, and seventh lenses are spherical mirrors. The object-side and image-side surfaces of any one of the second, third, fourth, eighth, and ninth lenses are aspherical. The second, fourth, eighth, and ninth lenses are conventional aspherical lenses. Table 3-2 shows the higher-order coefficients that can be used for each conventional aspherical mirror in Example 3. Each conventional aspherical surface shape can be defined by formula (1) given in Example 1 above. The third lens is a freeform surface, more specifically, a Zernike edge sagitta surface.

[0154] The Zernike edge sag surface is defined by an even-order aspherical surface (supporting planes, spheres, quadric surfaces, and polynomial aspherical surfaces) plus some additional aspherical conditions determined by the Zernike edge coefficients. The surface sag form is:

[0155]

[0156] Where N is the index of the Zernike coefficients in the series, Ai is the coefficient of the i-th Zernike marginal polynomial, r is the radial ray coordinate, and ρ is the normalized radial ray coordinate. These are the coordinates of a ray, expressed in angles.

[0157] Table 3-3 shows the higher-order coefficients that can be used for each Zernike edge elevation surface in Example 3, wherein each Zernike edge elevation surface can be defined by the above formula (3).

[0158] Face number k A4 A6 A8 A10 A12 A14 A16 S3 0.00 4.50E-03 -3.04E-04 1.36E-05 -3.23E-07 3.41E-09 0.00E+00 0.00E+00 S4 -0.87 1.53E-04 1.81E-03 -4.75E-04 4.28E-05 -1.64E-06 0.00E+00 0.00E+00 S7 -0.35 -8.97E-04 7.31E-04 2.35E-04 -1.45E-04 2.02E-05 2.99E-06 -4.25E-07 S8 -20.96 1.95E-02 -3.23E-03 5.00E-03 -5.98E-03 2.94E-03 4.54E-03 -3.60E-03 S15 -5.62 -4.77E-03 3.29E-04 -1.75E-05 1.46E-05 7.20E-07 -8.00E-08 -1.49E-08 S16 -1.03 9.70E-04 -1.83E-04 8.29E-05 -1.50E-05 2.71E-06 -1.82E-07 2.16E-08 S17 4.10 1.40E-04 1.58E-03 -6.15E-05 4.35E-06 -3.88E-07 0.00E+00 0.00E+00 S18 2.05 -7.87E-04 1.68E-03 -1.71E-04 2.09E-05 -7.10E-07 0.00E+00 0.00E+00

[0159] Table 3-2

[0160]

[0161]

[0162] Table 3-3

[0163] In this embodiment, the maximum field of view (FOV) of the optical lens is 130°, and the absolute value of optical distortion is 1.0%. Figure 6 The distortion curve of the optical lens of Embodiment 3 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figure 6 It can be seen that the optical lens given in Example 3 can achieve good imaging quality.

[0164] Example 4

[0165] The following is for reference Figure 7 An optical lens according to Embodiment 4 of this application is described. Figure 7 A schematic diagram of the structure of an optical lens according to Embodiment 4 of this application is shown.

[0166] like Figure 7 As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9.

[0167] The first lens L1 has negative optical power, with its object side S1 being convex and its image side S2 being concave.

[0168] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0169] The third lens L3 has negative optical power, with its object side S5 being convex and its image side S6 being concave.

[0170] The fourth lens L4 has positive optical power, with its object side S7 being convex and its image side S8 being concave.

[0171] The fifth lens L5 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0172] The sixth lens L6 has positive optical power, with its object side S12 being concave and its image side S13 being convex.

[0173] The seventh lens L7 has negative optical power, and its object side S13 is concave, and its image side S14 is concave.

[0174] The eighth lens L8 has positive optical power, and its object side S15 is convex, and its image side S16 is convex.

[0175] The ninth lens L9 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex.

[0176] The optical lens may also include an aperture stop STO, which may be positioned between the fourth lens L4 and the fifth lens L5 to improve image quality.

[0177] Optionally, the optical lens may also include a filter CG having an object-side surface S19 and an image-side surface S20 and / or a protective glass (not shown) having both an object-side surface and an image-side surface. The filter CG and / or the protective glass can be used to correct color aberrations, and can also be used to protect the image sensor chip IMA located at the imaging surface. Light from the object passes sequentially through each surface S1 to S20 and is finally imaged onto the imaging surface.

[0178] Table 4-1 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens in the optical lens of Example 4, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0179]

[0180]

[0181] Table 4-1

[0182] In Example 4, the first, fifth, sixth, and seventh lenses are spherical mirrors. The object-side and image-side surfaces of any one of the second, third, fourth, eighth, and ninth lenses are aspherical. The second, third, fourth, and eighth lenses are conventional aspherical lenses, and the ninth lens is a freeform surface lens, more specifically, a Zernike edge sagitta. Table 4-2 shows the higher-order coefficients that can be used for each conventional aspherical mirror in Example 4, wherein each conventional aspherical surface can be defined by formula (1) given in Example 1 above. Table 4-3 shows the higher-order coefficients that can be used for each Zernike edge sagitta in Example 4, wherein each Zernike edge sagitta can be defined by formula (3) given in Example 3 above.

[0183] Face number k A4 A6 A8 A10 A12 A14 A16 S3 0.00 5.35E-03 -3.14E-04 1.38E-05 -3.37E-07 3.93E-09 0.00E+00 0.00E+00 S4 -0.91 -2.65E-03 2.33E-03 -4.66E-04 4.15E-05 -1.62E-06 0.00E+00 0.00E+00 S5 3.56 -4.00E-02 8.13E-03 -1.01E-03 6.92E-05 -1.71E-06 -4.69E-08 1.46E-09 S6 -0.19 -3.20E-02 1.04E-02 -2.27E-03 1.20E-04 2.37E-05 7.96E-08 -1.12E-07 S7 0.03 6.11E-03 -8.77E-04 -2.03E-04 -7.59E-05 2.02E-05 2.99E-06 -4.25E-07 S8 -17.66 1.75E-02 -4.85E-03 7.60E-03 -7.59E-03 2.94E-03 4.54E-03 -3.60E-03 S15 -5.63 -3.36E-03 7.50E-04 9.89E-06 6.50E-06 7.19E-07 -8.00E-08 -1.49E-08 S16 0.31 -2.74E-04 5.94E-04 2.25E-04 -2.52E-05 2.71E-06 -1.82E-07 2.16E-08

[0184] Table 4-2

[0185]

[0186]

[0187] Table 4-3

[0188] In this embodiment, the maximum field of view (FOV) of the optical lens is 130°, and the absolute value of optical distortion is 0.8%. Figure 8 The distortion curve of the optical lens of Example 4 is shown, representing the distortion magnitude corresponding to different image heights. According to... Figure 8 It can be seen that the optical lens given in Example 4 can achieve good imaging quality.

[0189] Example 5

[0190] The following is for reference Figure 9 An optical lens according to Embodiment 5 of this application is described. Figure 9 A schematic diagram of the structure of an optical lens according to Embodiment 5 of this application is shown.

[0191] like Figure 9As shown, the optical lens includes, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9.

[0192] The first lens L1 has negative optical power, with its object side S1 being convex and its image side S2 being concave.

[0193] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0194] The third lens L3 has negative optical power, and its object side S5 is concave, as is its image side S6.

[0195] The fourth lens L4 has positive optical power, with its object side S7 being convex and its image side S8 being concave.

[0196] The fifth lens L5 has positive optical power, and its object side S10 is convex, and its image side S11 is convex.

[0197] The sixth lens L6 has positive optical power, with its object side S12 being concave and its image side S13 being convex.

[0198] The seventh lens L7 has negative optical power, and its object side S13 is concave, and its image side S14 is concave.

[0199] The eighth lens L8 has positive optical power, and its object side S15 is convex, and its image side S16 is convex.

[0200] The ninth lens L9 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex.

[0201] The optical lens may also include an aperture stop STO, which may be positioned between the fourth lens L4 and the fifth lens L5 to improve image quality.

[0202] Optionally, the optical lens may also include a filter CG having an object-side surface S19 and an image-side surface S20 and / or a protective glass (not shown) having both an object-side surface and an image-side surface. The filter CG and / or the protective glass can be used to correct color aberrations, and can also be used to protect the image sensor chip IMA located at the imaging surface. Light from the object passes sequentially through each surface S1 to S20 and is finally imaged onto the imaging surface.

[0203] Table 5-1 shows the radius of curvature, thickness / distance, refractive index, and Abbe number of each lens in the optical lens of Example 5, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0204]

[0205]

[0206] Table 5-1

[0207] In Example 5, the first, fifth, sixth, and seventh lenses are spherical mirrors. The object-side and image-side surfaces of any one of the second, third, fourth, eighth, and ninth lenses are aspherical. Among them, the second, third, fourth, and eighth lenses are conventional aspherical lenses, and the ninth lens is a freeform surface lens, more specifically, an extended polynomial surface type. Table 5-2 shows the higher-order coefficients that can be used for each conventional aspherical mirror in Example 5, wherein each conventional aspherical surface type can be defined by formula (1) given in Example 1 above. Table 5-3 shows the higher-order coefficients that can be used for each extended polynomial surface type in Example 5, wherein each extended polynomial surface type can be defined by formula (2) given in Example 1 above.

[0208] Face number k A4 A6 A8 A10 A12 A14 A16 S3 0.00 4.50E-03 -3.03E-04 1.36E-05 -3.23E-07 3.44E-09 0.00E+00 0.00E+00 S4 -0.87 -9.17E-05 1.82E-03 -4.75E-04 4.29E-05 -1.63E-06 0.00E+00 0.00E+00 S5 -44.00 -3.39E-02 8.13E-03 -1.03E-03 6.97E-05 -1.69E-06 -4.69E-08 1.46E-09 S6 0.42 -3.56E-02 1.08E-02 -1.33E-03 -4.78E-06 2.37E-05 7.96E-08 -1.12E-07 S7 -0.38 -1.39E-03 7.44E-04 2.55E-04 -1.42E-04 2.02E-05 2.99E-06 -4.25E-07 S8 -18.24 1.99E-02 -3.21E-03 4.71E-03 -5.76E-03 2.94E-03 4.54E-03 -3.60E-03 S15 -5.40 -4.93E-03 2.82E-04 -1.34E-05 1.47E-05 7.19E-07 -8.00E-08 -1.49E-08 S16 -0.99 8.18E-04 -2.54E-04 7.96E-05 -1.39E-05 2.71E-06 -1.82E-07 2.16E-08

[0209] Table 5-2

[0210]

[0211]

[0212] Table 5-3

[0213] In this embodiment, the maximum field of view (FOV) of the optical lens is 130°, and the absolute value of optical distortion is 2.0%. Figure 10 The distortion curve of the optical lens of Embodiment 5 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figure 10 It can be seen that the optical lens given in Example 5 can achieve good imaging quality.

[0214] In summary, Examples 1 to 5 satisfy the relationships shown in Table 6 below.

[0215] Conditional Implementation Examples Example 1 Example 2 Example 3 Example 4 Example 5 -18.7≤F1 / F≤-12.1 -15.532 -12.469 -18.630 -12.241 -18.119 -2.7≤F² / F≤-2.4 -2.426 -2.606 -2.462 -2.524 -2.473 -4.0≤F3 / F≤-3.1 -3.963 -3.617 -3.211 -3.591 -3.195 3.0≤F4 / F≤3.7 3.634 3.078 3.047 3.020 3.023 1.9≤F5 / F≤2.3 1.966 2.221 1.970 2.159 1.967 2.3≤F6 / F≤6.1 2.383 5.618 2.353 6.049 2.350 -2.0≤F7 / F≤-1.1 -1.223 -1.939 -1.191 -1.933 -1.187 2.4 ≤ F8 / F ≤ 3.5 2.700 3.348 2.471 3.214 2.470 6.8 ≤ F9 / F ≤ 15.7 11.362 7.030 15.590 7.270 15.156 -3.2≤Fa / F≤-2.2 -2.409 -3.031 -2.313 -2.851 -2.305 -3.0≤Fb / F≤-1.5 -1.531 -2.945 -1.638 -1.624 -1.623 2.4 ≤ Fc / F ≤ 2.8 2.626 2.546 2.649 2.532 2.659 1.6 ≤ BFL / F ≤ 1.8 1.705 1.705 1.705 1.674 1.705 -0.1≤D1 / F1≤0 -0.032 -0.042 -0.026 -0.041 -0.027 -0.8≤F3 / R31≤0.1 -0.716 -0.618 0.029 -0.612 0.029 0 ≤ F / TTL ≤ 0.1 0.068 0.068 0.068 0.070 0.068 0.2≤D59 / TTL≤0.4 0.342 0.321 0.338 0.321 0.339

[0216] Table 6

[0217] This application also provides an electronic device that may include an optical lens according to the above embodiments of this application and an imaging element for converting an optical image formed by the optical lens into an electrical signal. The electronic device may be a stand-alone electronic device, such as a rangefinder camera, or an imaging module integrated into a rangefinder device. Furthermore, the electronic device may also be a stand-alone imaging device, such as an in-vehicle camera, or an imaging module integrated into a driver assistance system, such as a vehicle-mounted camera.

[0218] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that, The optical lens comprises, along the optical axis from the object side to the image side, the following 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 convex object side and a concave image side. The third lens with negative optical power has a concave image-side surface; The fourth lens with positive optical power has a convex object side and a concave image side. The fifth lens with positive optical power has a convex object-side surface and a convex image-side surface; The sixth lens with positive optical power has a concave object side and a convex image side. The seventh lens with negative optical power has a concave object side and a concave image side. An eighth lens with positive optical power, having a convex object-side surface and a convex image-side surface; and The ninth lens with positive optical power has a concave object side and a convex image side. The optical lens contains nine lenses with optical power. The combined focal length Fb of the first lens, the second lens, the third lens, and the fourth lens satisfies the following condition with respect to the effective focal length F of the optical lens: -3.0 ≤ Fb / F ≤ -1.5; The effective focal length F9 of the ninth lens and the effective focal length F of the optical lens satisfy the following condition: 6.8 ≤ F9 / F ≤ 15.

7.

2. The optical lens according to claim 1, wherein, The effective focal length F1 of the first lens and the effective focal length F of the optical lens satisfy: -18.7≤F1 / F≤-12.

1.

3. The optical lens according to claim 1, wherein, The effective focal length F2 of the second lens and the effective focal length F of the optical lens satisfy: -2.7≤F2 / F≤-2.

4.

4. The optical lens according to claim 1, wherein, The effective focal length F3 of the third lens and the effective focal length F of the optical lens satisfy the following condition: -4.0≤F3 / F≤-3.

1.

5. The optical lens according to claim 1, wherein, The effective focal length F4 of the fourth lens and the effective focal length F of the optical lens satisfy the following condition: 3.0≤F4 / F≤3.

7.

6. The optical lens according to claim 1, wherein, The effective focal length F5 of the fifth lens and the effective focal length F of the optical lens satisfy the following condition: 1.9 ≤ F5 / F ≤ 2.

3.

7. The optical lens according to claim 1, wherein, The effective focal length F6 of the sixth lens and the effective focal length F of the optical lens satisfy the following condition: 2.3≤F6 / F≤6.

1.

8. The optical lens according to claim 1, wherein, The effective focal length F7 of the seventh lens and the effective focal length F of the optical lens satisfy the following condition: -2.0≤F7 / F≤-1.

1.

9. The optical lens according to claim 1, wherein, The effective focal length F8 of the eighth lens and the effective focal length F of the optical lens satisfy the following condition: 2.4≤F8 / F≤3.

5.

10. The optical lens according to any one of claims 1-9, wherein, The combined focal length Fa of the sixth lens and the seventh lens satisfies the following condition with respect to the effective focal length F of the optical lens: -3.2 ≤ Fa / F ≤ -2.

2.

11. The optical lens according to any one of claims 1-9, wherein, The combined focal length Fc of the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens and the effective focal length F of the optical lens satisfy the following condition: 2.4≤Fc / F≤2.

8.

12. The optical lens according to any one of claims 1-9, wherein, The distance BFL from the center of the image side of the ninth lens to the center of the imaging surface of the optical lens satisfies the following condition with respect to the effective focal length F of the optical lens: 1.6 ≤ BFL / F ≤ 1.

8.

13. The optical lens according to any one of claims 1-9, wherein, The center thickness D1 of the first lens on the optical axis and the effective focal length F1 of the first lens satisfy: -0.1≤D1 / F1≤0.

14. The optical lens according to any one of claims 1-9, wherein, The effective focal length F3 of the third lens and the radius of curvature R31 of the object side surface of the third lens satisfy the following condition: -0.8≤F3 / R31≤0.

1.

15. The optical lens according to any one of claims 1-9, wherein, The effective focal length F of the optical lens and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following: 0 ≤ F / TTL ≤ 0.

1.

16. The optical lens according to any one of claims 1-9, wherein, The distance D59 from the center of the object side of the fifth lens to the center of the image side of the ninth lens and the distance TTL from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis satisfy the following condition: 0.2≤D59 / TTL≤0.4.

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