Optical lens, camera module and terminal device

Abstract

Embodiments of the present application provide an optical lens, a camera module and a terminal device. The optical lens comprises, in order from the object side to the image side: a first lens having positive refractive power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; a second lens having positive refractive power, the object side surface of which is a convex surface; a third lens having negative refractive power, the image side surface of which is a concave surface; a fourth lens having negative refractive power, the image side surface of which is a concave surface; a fifth lens having positive refractive power, both the object side surface and the image side surface of which are convex surfaces; a sixth lens having refractive power; a seventh lens having refractive power; an eighth lens having refractive power, the image side surface of which is a convex surface; and a ninth lens having refractive power, the image side surface of which is a convex surface. The optical lens satisfies the relationship: 18deg≤FOV≤26deg, 1.5≤FNO≤1.7. The optical lens of the embodiments of the present application can expand the field of view while meeting the long focal length, and ensure sufficient light quantity in low light conditions, thereby improving the imaging effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of camera, in particular to an optical lens, a camera module and a terminal device. BACKGROUND

[0002] With the development of Advanced Driver Assistance Systems (ADAS) and automatic driving technology, the demand for long-focus vehicle-mounted lenses with long-distance detection capability is increasing to meet the requirements of identifying long-distance targets (such as vehicles, pedestrians, traffic signs, etc.).

[0003] However, the existing long-focus vehicle-mounted lenses have the problem of relatively narrow field of view range, which limits the observation angle in the horizontal and vertical directions, and easily causes safety hazards; in addition, the light throughput is insufficient, and the imaging effect is poor in low-illumination environments (such as night, tunnels, rainy and foggy weather, etc.). Therefore, it is an urgent problem to improve the field of view range and light throughput of long-focus vehicle-mounted lenses. SUMMARY

[0004] The embodiments of the present application provide an optical lens, a camera module and a terminal device, which can have a large field of view angle while meeting the long-focus requirement, and ensure sufficient light throughput in low-light conditions to improve the imaging effect.

[0005] In a first aspect, the embodiments of the present application provide an optical lens, which has nine lenses with refractive power, and comprises, in order from the object side to the image side along the optical axis: a first lens with positive refractive power, the object side surface of the first lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis; a second lens with positive refractive power, the object side surface of the second lens is convex near the optical axis; a third lens with negative refractive power, the image side surface of the third lens is concave near the optical axis; a fourth lens with negative refractive power, the image side surface of the fourth lens is concave near the optical axis; a fifth lens with positive refractive power, the object side surface of the fifth lens is convex near the optical axis, and the image side surface of the fifth lens is convex near the optical axis; a sixth lens with refractive power; a seventh lens with refractive power; an eighth lens with refractive power, the image side surface of the eighth lens is convex near the optical axis; and a ninth lens with refractive power, the image side surface of the ninth lens is convex near the optical axis. The optical lens satisfies the relationship: 18deg≤FOV≤26deg, 1.5≤FNO≤1.7; wherein FOV is the maximum field of view angle of the optical lens, and FNO is the aperture number of the optical lens.

[0006] In the embodiment, the first lens with positive refractive power is matched with an object side surface being convex at the near optical axis and an image side surface being concave at the near optical axis, which is beneficial to converge light and correct aberration. The second lens with positive refractive power is matched with an object side surface being convex at the near optical axis, which is beneficial to further converge light passing through the first lens. The third lens with negative refractive power is matched with an image side surface being concave at the near optical axis, which is beneficial to diverge light excessively converged by the first lens and the second lens, prevent light beam from being focused too early, thereby indirectly lengthening the physical length of the optical system to meet the long focus requirement; the third lens can also compensate for the field curvature and spherical aberration generated by the front group, and adjust the propagation angle of the chief ray through light divergence, thereby reducing the astigmatism and distortion of the edge field of view. The fourth lens with negative refractive power is matched with an image side surface being concave at the near optical axis, which can further suppress the residual aberration of the third lens, enhance the divergence effect, disperse the edge light of the light beam, reduce the negative impact of the field curvature, and adjust the angle of light incident to the fifth lens. The fifth lens with positive refractive power is matched with an object side surface being convex at the near optical axis and an image side surface being convex at the near optical axis, which is beneficial to ensure that the light beam converges toward the image plane, and the symmetrical convex structure of the fifth lens helps to balance the distortion generated by the front group of lenses, especially corrects the barrel distortion and the pincushion distortion, and improves the global correction ability of the system to spherical aberration through refractive power reversal. The eighth lens with refractive power is matched with an image side surface being convex at the near optical axis, which can adjust the angle of the chief ray incident to the image plane, and is beneficial to eliminate the field curvature and distortion of the optical lens. The ninth lens with refractive power is matched with an image side surface being convex at the near optical axis, which is beneficial to control light to arrive at the image plane at a nearly vertical angle, thereby reducing the influence of aberration on the edge image quality.

[0007] In the embodiment, by satisfying the above relationship formula for the maximum field of view FOV of the optical lens, the optical lens can meet the long focus characteristic while having a larger field of view, which is beneficial to increase the field of view range of the optical lens. By satisfying the above relationship formula for the F number FNO of the optical lens, the optical lens can have a larger light quantity, can improve the exposure efficiency of the optical lens under weak light conditions (such as night, tunnel, rainy and foggy weather, etc.), while ensuring good resolution of the optical lens, and improving the imaging quality of the optical lens. Therefore, the scheme of the embodiment can not only meet the long focus while expanding the field of view range, but also ensure sufficient light quantity under weak light conditions, which is beneficial to improve the imaging quality of the optical lens.

[0008] In an implementation form of the first aspect, the optical lens satisfies one or more of the following relationship formulas: 1.1≤TTL / F≤1.55, 4.3≤F / ImgH≤6.1, 10.5 deg≤FOV / FNO≤17 deg. Wherein, TTL is the total optical length of the optical lens, F is the effective focal length of the optical lens, ImgH is half of the maximum field of view angle corresponding to the image height of the optical lens, FOV is the maximum field of view angle of the optical lens, and FNO is the F number of the optical lens.

[0009] In this implementation, by limiting TTL / F to the above range, the optical lens can meet the characteristics of a telephoto lens; by limiting F / ImgH to the above range, the optical lens can meet the requirements of high image sharpness while having a large depth of field; by limiting FOV / FNO to the above range, the optical lens can achieve a balance between field of view and light transmission, optimize depth of field, improve optical performance in low light, and reduce distortion.

[0010] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 6.5≤F1 / CT1≤11.5, 1.9≤F5 / CT5≤6.8, 0.8≤CT5 / CT6≤6. Wherein, F1 is the focal length of the first lens, CT1 is the thickness of the first lens along the optical axis, F5 is the focal length of the fifth lens, CT5 is the thickness of the fifth lens along the optical axis, and CT6 is the thickness of the sixth lens along the optical axis.

[0011] In this implementation, by limiting F1 / CT1 to the above range, the aberrations caused by the first lens can be reduced while ensuring sufficient focal length; by limiting F5 / CT5 to the above range, the system aberrations of the optical lens can be corrected while ensuring sufficient focal length; by limiting CT5 / CT6 to the above range, the total thickness of the fifth and sixth lenses can be reduced, which is beneficial to the miniaturization of the optical lens.

[0012] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 0.8≤|(R11-R12) / (R11+R12)|≤11, -1.7≤R9 / R10≤-0.3, 2.4≤|R18 / R17|≤4. Wherein, R11 is the radius of curvature of the object-side surface of the sixth lens at the optical axis, R12 is the radius of curvature of the image-side surface of the sixth lens at the optical axis, R9 is the radius of curvature of the object-side surface of the fifth lens at the optical axis, R10 is the radius of curvature of the image-side surface of the fifth lens at the optical axis, R17 is the radius of curvature of the object-side surface of the ninth lens at the optical axis, and R18 is the radius of curvature of the image-side surface of the ninth lens at the optical axis.

[0013] In this implementation, limiting |(R11-R12) / (R11+R12)| to the above range helps to reasonably control the curvature radii of the object-side and image-side surfaces of the sixth lens at the optical axis, thereby effectively controlling the shape of the sixth lens and allowing it to refract incident light more gently, avoiding increased aberrations. Below the lower limit of the relation, the curvature radii of the object-side and image-side surfaces of the sixth lens differ too much at the optical axis, resulting in an overly flat object-side or image-side surface, weakening the refraction of incident light and hindering control of the total optical length (TTL). Above the upper limit of the relation, the curvature radii of the object-side and image-side surfaces of the sixth lens differ too little at the optical axis, leading to excessive bending of light by the sixth lens and a tendency to reflect light with other lenses, producing ghosting. Limiting R9 / R10 to the above range allows for a uniform refractive power distribution of the fifth lens in the optical lens, which helps reduce field astigmatism and distortion. By limiting |R18 / R17| to the above range, the refractive power of the ninth lens of the optical lens can be uniformly configured, which helps to reduce field astigmatism and distortion of the optical lens.

[0014] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 0.95≤|F23 / F|≤20, -14≤R16 / F≤-0.5, 0.9≤|F / F9|≤2.1. Wherein, F23 is the combined focal length of the second and third lenses, F is the effective focal length of the optical lens, R16 is the radius of curvature of the image-side surface of the eighth lens at the optical axis, and F9 is the focal length of the ninth lens.

[0015] In this implementation, by limiting |F23 / F| to the above range, excessive spherical aberration introduced by the second and third lenses can be avoided, thus improving the resolving power of the optical lens; by limiting R16 / F to the above range, it can be ensured that the light converges smoothly to the sensor target surface, making the structure of the optical lens more compact; by limiting |F / F9| to the above range, astigmatism and chromatic aberration of the optical lens can be reduced, while the edge thickness of the ninth lens L9 can be reduced to make the structure of the optical lens more compact.

[0016] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 1.1≤CT1 / SAGS1≤2, 0.29≤CT3 / ET3≤0.75, 0.45≤CT9 / ET9≤1.5. Wherein, CT1 is the thickness of the first lens along the optical axis, SAGS1 is the sagitta of the edge of the effective optical diameter on the object side of the first lens, CT3 is the thickness of the third lens along the optical axis, ET3 is the distance from the maximum effective aperture on the object side of the third lens to the maximum effective aperture on the image side of the third lens along the optical axis, CT9 is the thickness of the ninth lens along the optical axis, and ET9 is the distance from the maximum effective aperture on the object side of the ninth lens to the maximum effective aperture on the image side of the ninth lens along the optical axis.

[0017] In this implementation, limiting CT1 / SAGS1 to the above range helps control the curvature of the object-side surface of the first lens, thereby controlling the aperture of the first lens and facilitating its manufacturing. When the ratio of CT1 to SAGS1 is lower than the lower limit of the above formula, the object-side surface of the first lens is excessively curved, which is detrimental to the surface shape control of the first lens and increases the risk of ghosting. When the ratio of CT1 to SAGS1 exceeds the upper limit of the above formula, the first lens is too thick, which is detrimental to the miniaturization of the optical lens. By limiting CT3 / ET3 to the above range, the ratio of the center thickness to the edge thickness of the third lens can be reasonably controlled, resulting in a reasonable overall thickness of the third lens, which is beneficial for achieving miniaturized optical lens design. By limiting CT9 / ET9 to the above range, the ratio of the center thickness to the edge thickness of the ninth lens can be reasonably controlled, resulting in a reasonable overall thickness of the ninth lens, which is beneficial for achieving miniaturized optical lens design.

[0018] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 1.55≤SD1 / ImgH≤1.95, 9.7≤TTL / BFL≤15.7, 0.8≤SD12 / SD13≤1.1. Wherein, SD1 is half the maximum effective aperture of the object-side surface of the first lens, ImgH is half the image height corresponding to the maximum field of view of the optical lens, TTL is the total optical length of the optical lens, BFL is the back focal length of the optical lens, SD12 is half the maximum effective aperture of the image-side surface of the sixth lens, and SD13 is half the maximum effective aperture of the object-side surface of the seventh lens.

[0019] In this implementation, by limiting SD1 / ImgH to the above range, the optical lens can meet the requirements of adapting to a large imaging surface, while also taking into account the miniaturization design of the side of the optical lens away from the imaging surface; by limiting TTL / BFL to the above range, the optical lens can meet the telephoto characteristics while making the structure of the optical lens more compact; by limiting SD12 / SD13 to the above range, the sensitivity of system tolerances (such as eccentricity tolerance and tilt tolerance) can be reduced, which can help improve the resolution of the optical lens.

[0020] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 6.4 ≤ TTL / ImgH ≤ 6.9, 7.7 ≤ TTL / CT max ≤9.2, 4.6≤CT max / CT min ≤5.9. Where TTL is the total optical length of the optical lens, ImgH is half the image height corresponding to the maximum field of view of the optical lens, and CT... max CT represents the maximum thickness of the first to ninth lenses along the optical axis. min It represents the minimum thickness of the first to ninth lenses along the optical axis.

[0021] In this implementation, by limiting TTL / ImgH to the above range, the optical lens can meet both the requirements of high pixel count and miniaturization; by limiting TTL / CT... max Limiting it to the above range is beneficial for achieving miniaturization of optical lenses and synergistic optimization of optical performance; by using CT... max / CT min Limiting the lens thickness to the above range allows for a reasonable distribution of lens thickness, which helps reduce aberrations in optical lenses.

[0022] Secondly, embodiments of this application provide a camera module, including a photosensitive chip and any of the aforementioned optical lenses, with the photosensitive chip disposed on the image side of the optical lens. In this embodiment, the camera module having any of the aforementioned optical lenses can expand the field of view while satisfying telephoto characteristics, and ensure sufficient light transmission under low-light conditions, thereby improving imaging performance.

[0023] Thirdly, embodiments of this application provide a terminal device, including a main body and a camera module provided in the second aspect of this application, wherein the camera module is disposed on the main body. In this embodiment, the terminal device having the camera module can expand the field of view while satisfying the telephoto characteristics, and ensure sufficient light transmission under low light conditions, thereby improving the imaging effect and enhancing the user experience. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the structure of a terminal device in one embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the camera module in the first embodiment;

[0026] Figure 3 yes Figure 2 A schematic diagram of the optical lens structure in the diagram;

[0027] Figure 4 yes Figure 3 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image;

[0028] Figure 5 This is a schematic diagram of the optical lens in the second embodiment;

[0029] Figure 6 yes Figure 5 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image;

[0030] Figure 7 This is a schematic diagram of the optical lens in the third embodiment;

[0031] Figure 8 yes Figure 7 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image;

[0032] Figure 9 This is a schematic diagram of the optical lens in the fourth embodiment;

[0033] Figure 10 yes Figure 9 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image;

[0034] Figure 11 This is a schematic diagram of the optical lens in the fifth embodiment;

[0035] Figure 12 yes Figure 11 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image;

[0036] Figure 13 This is a schematic diagram of the optical lens in the sixth embodiment;

[0037] Figure 14 yes Figure 13 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image;

[0038] Figure 15 This is a schematic diagram of the optical lens in the seventh embodiment;

[0039] Figure 16 yes Figure 15 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image. Detailed Implementation

[0040] For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be explained and described below.

[0041] Refractive power is a quantitative measure of the ability of parallel light rays to converge or diverge after passing through a lens or optical system; it is also known as refractive power or optical power.

[0042] A lens or lens group with positive refractive power, having a positive focal length, and having the effect of converging light.

[0043] A lens or lens group with negative refractive power has a negative focal length and has the effect of diverging light.

[0044] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical system. It refers to the perpendicular distance from the optical center of a lens or lens group to the focal plane when a distant object is projected into a sharp image. From a practical perspective, it can be understood as the distance from the center of the lens to the focal plane when the object is at infinity. For fixed-focus lenses, the position of their optical center remains constant; for optical lenses, changes in the optical center result in changes in the focal length.

[0045] The object side is defined by the lens; the side where the object is located is called the object side, and the surface of the lens closest to the object side is called the object side surface.

[0046] The image side is the side on which the image of the subject is located, with the lens as the boundary. The surface of the lens closest to the image side is called the image side surface.

[0047] A diaphragm is a device used to control the amount of light passing through the lens and entering the sensor inside the camera body; it is usually located inside the lens.

[0048] Aperture number, also known as F-number (FNO), is a relative value derived from the lens's focal length and entrance pupil diameter (the reciprocal of the relative aperture). A smaller aperture number allows more light to pass through in the same unit of time. A larger aperture number results in a shallower depth of field, blurring the background in the photograph, similar to the effect of an optical lens.

[0049] Total Track Length (TTL) refers to the total length along the optical axis from the surface of the lens closest to the object to the imaging plane.

[0050] Back focal length (BFL) refers to the distance from the vertex of the surface of the last lens or optical element in an optical system to the image plane; it is also called the back focal distance.

[0051] The imaging plane is located on the image side of all lenses in an optical lens, and is the surface on which light rays pass through each lens in the optical lens in sequence to form an image.

[0052] The optical axis is a vertical axis that passes through the center of a lens. The lens optical axis is the axis that passes through the centers of each lens in the lens.

[0053] The meridian direction (Tangential, T) lies within the meridian plane, which is a plane formed by the principal ray from an off-axis object point and the optical axis of the optical system.

[0054] The sagittal direction (S) lies within the sagittal plane, which is a plane that contains the principal ray and is orthogonal to the meridional plane. The sagittal plane intersects the optical axis at the entrance pupil and is perpendicular to the meridional plane.

[0055] Sagittal height is a parameter used in optical lens design to describe the geometric characteristics of a lens surface. The sagittal height of a point on a lens surface is the distance from that point to the intersection of that surface and the optical axis along the optical axis.

[0056] The focal point is the point where parallel light rays converge after being refracted by a lens or lens group.

[0057] The Abbe number, also known as the dispersion coefficient, is the ratio of the difference in refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0058] The Chief Ray Angle (CRA) is a key parameter that measures the maximum angle at which light rays strike a sensor pixel; it can also be called the principal ray angle.

[0059] The field of view (FOV) in optical instruments is the angle between the two edges of the lens, representing the maximum range through which the image of the target object can pass through the lens. The size of the FOV determines the field of view of the optical instrument; a larger FOV results in a wider field of view but a lower optical magnification.

[0060] Half-image height (ImgH) represents half the diagonal length of the effective pixel area on the image sensor, which is also half the image height of the imaging surface.

[0061] The effective optical diameter refers to the diameter of the area within an optical element (such as a lens or prism) that actually participates in imaging or light transmission. It reflects the maximum physical diameter of a light beam that is not obstructed by mechanical structures when passing through the optical element.

[0062] Effective aperture refers to the ratio of the diameter of the front lens beam (or the lens diameter) to the focal length when the lens is opened to its maximum aperture; it is the reciprocal of the aperture number. The maximum effective aperture indicates the maximum light-gathering capability of an optical lens.

[0063] Aberrations are the properties of an ideal optical system in the paraxial region. Paraxial rays emitted from a point on an object intersect the image plane at a single point (i.e., the paraxial image point). However, in reality, rays passing through different apertures of a lens rarely intersect perfectly at a single point. Instead, they deviate from the position of the paraxial image point. These differences are collectively referred to as aberrations.

[0064] Longitudinal spherical aberration, also known as longitudinal chromatic aberration, positional chromatic aberration, or axial aberration, occurs when a beam of light parallel to the optical axis converges at different positions after passing through a lens. This aberration is called positional chromatic aberration or axial chromatic aberration. This is because the lens images different wavelengths of light at different positions, causing the image-side focal planes of different colors of light to not coincide, resulting in the dispersion of polychromatic light.

[0065] Lateral chromatic aberration is a color separation phenomenon caused by the different magnification of light of different wavelengths on the image plane. It manifests as colored fringing (such as blue or red fringing) at the edges of the image.

[0066] Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical system relative to the object itself. Distortion occurs due to the spherical aberration of the aperture. The height of the intersection point between the principal ray from different fields of view and the Gaussian image plane is not equal to the ideal image height; this difference is the distortion. Therefore, distortion only changes the imaging position of an off-axis object point on the ideal plane, causing a distortion in the image shape, but it does not affect the image's sharpness.

[0067] Barrel distortion is characterized by outward bulging and bending of the image edges, while the central area is relatively normal or slightly convex, with the overall shape resembling the cross-section of a wooden barrel.

[0068] Pillow-shaped distortion is characterized by the inward contraction and depression of the image edges, with the central area being flat or slightly concave, and the overall shape resembling a pillow.

[0069] Astigmatism occurs because the object point is not on the optical axis of the optical system, and the emitted beam of light has an angle with the optical axis. After refraction by a lens, the convergence points of the meridional and sagittal beams are not at the same point. That is, the beam cannot be focused on a single point, resulting in an unclear image, hence astigmatism. The meridional and sagittal beams are the names of beams in two perpendicular planes within a rotationally symmetric optical system.

[0070] Field curvature refers to the difference in optical axis between the position of the sharpest image point after rays from the off-center field of view pass through an optical lens assembly and the position of the sharpest image point in the center field of view. When a lens has field curvature, the intersection of the entire beam does not coincide with the ideal image point. Although a sharp image point can be obtained at each specific point, the entire image plane is a curved surface.

[0071] Ghosting is the formation of a virtual image or spot of light on the imaging plane after light is reflected or scattered multiple times between optical components such as lenses and sensors. It usually appears as bright spots, halos, or colored stripes that are symmetrical or repeating with the original image, and is commonly seen in backlit shooting or scenes with strong light sources.

[0072] Eccentricity tolerance refers to the amount of parallel offset between the optical axis and the mechanical axis of an optical element, usually measured in micrometers (μm) or millimeters (mm). For example, the clearance between the outer diameter of a lens and the inner diameter of the lens barrel can cause eccentricity.

[0073] Tilt tolerance refers to the angular deviation between the optical axis and the mechanical axis, usually expressed in arcminutes (') or microradians (μrad). Tilt tolerance, along with the eccentricity tolerance mentioned above, will disrupt the coaxiality of the optical system, leading to asymmetric aberrations such as coma and astigmatism, which directly affect imaging resolution.

[0074] A Camera Monitor System (CMS) is an in-vehicle system that completely replaces traditional optical rearview mirrors. The camera is installed on the upper front of the vehicle, near the traditional rearview mirror.

[0075] This application provides a terminal device, which includes, but is not limited to, automobiles (including fuel vehicles, electric vehicles, and hybrid vehicles), monitors, mobile phones, tablets, laptops, wearable devices, augmented reality (AR) glasses, AR helmets, virtual reality (VR) glasses, VR helmets, laptop computers, personal digital assistants (PDAs), or cameras and other devices with camera functions.

[0076] like Figure 1As shown, in one embodiment, the terminal device 100 can be, for example, a car. The terminal device 100 can include a main body 101 and a camera module 200, which can be a CMS electronic exterior rearview camera, for example, located in the position of a traditional rearview mirror.

[0077] Understandable Figure 1 The structure, size, number, and position of the camera module 200 shown are merely illustrative and not intended to limit this embodiment. In another embodiment, the camera module 200 may also be a side rearview camera, a front view camera, etc., and the camera module 200 may be located below a traditional rearview mirror or at the front of the vehicle, etc.

[0078] Figure 2 This is a schematic diagram of the structure of a camera module 200 in one embodiment. Figure 2 As shown, the camera module 200 may include a photosensitive chip 201 and an optical lens 300, with the photosensitive chip 201 disposed on the image side of the optical lens 300. The optical lens 300 is used to receive the light signal of the subject and project it onto the photosensitive chip 201, which is used to convert the light signal corresponding to the subject into an image signal.

[0079] Figure 3 for Figure 2 A structural schematic diagram of the optical lens 300. (Combined with...) Figure 2 and Figure 3 As shown, the optical lens 300 has nine refractive lenses, arranged sequentially from the object side to the image side along the optical axis O: lens L1, lens L2, lens L3, lens L4, lens L5, lens L6, lens L7, lens L8, and lens L9. During imaging, light rays enter the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, eighth lens L8, and ninth lens L9 sequentially from the object side of the first lens L1, and are finally imaged onto the image plane (IMG) of the optical lens 300. The image plane IMG can be located on the side of the photosensitive chip 201 in the camera module 200 facing the ninth lens L9.

[0080] like Figure 3 As shown, the first lens L1 has positive refractive power. The object-side surface S1 of the first lens L1 is convex near the optical axis O, and the image-side surface S2 of the first lens L1 is concave near the optical axis O. This configuration facilitates light convergence and aberration correction.

[0081] like Figure 3As shown, the second lens L2 has positive refractive power, and the object-side surface S3 of the second lens L2 is convex near the optical axis O. This configuration facilitates further focusing of the light rays passing through the first lens L1 into the third lens L3. The image-side surface S4 of the second lens L2 can be concave, convex, or flat near the optical axis O; this embodiment does not impose any limitations on this.

[0082] like Figure 3 As shown, the third lens L3 has negative refractive power, and the image-side surface S6 of the third lens L3 is concave near the optical axis O. The negative refractive power of the third lens L3 helps to diverge the excessively converged light rays from the first two positive lenses, preventing the beam from focusing too early, thereby indirectly lengthening the physical length of the optical system to meet the requirements of telephoto lenses. The concave design of the image-side surface of the third lens L3 can compensate for the field curvature and spherical aberration generated by the first group, and at the same time, it can adjust the propagation angle of the principal ray by diverging the light rays, reducing astigmatism and distortion in the edge field of view. The object-side surface S5 of the third lens L3 can be concave, convex, or flat near the optical axis O; this embodiment does not limit this.

[0083] like Figure 3 As shown, the second lens L2, which has positive refractive power, can be cemented with the third lens L3, which has negative refractive power, to form a cemented doublet lens. This is beneficial for reducing chromatic aberration and correcting spherical aberration of the optical lens 300, thereby improving the resolution of the optical lens 300. In another embodiment, the second lens L2 and the third lens L3 can also be independent lenses.

[0084] like Figure 3 As shown, the fourth lens L4 has negative refractive power, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis O. With this configuration, the residual aberration of the third lens L3 can be further suppressed; by enhancing the divergence effect, the edge rays of the beam are dispersed, reducing the negative impact of field curvature, while simultaneously adjusting the angle at which light is incident on the fifth lens L5. The object-side surface S7 of the fourth lens L4 can be concave, convex, or flat near the optical axis O; this embodiment does not limit this.

[0085] like Figure 3 As shown, the fifth lens L5 has positive refractive power, and both the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are convex near the optical axis O. This configuration facilitates the reconvergence of light rays diverged by the fourth lens L4, ensuring the beam converges towards the image plane. Its symmetrical convex structure helps balance the distortion produced by the front lenses, especially correcting barrel or pincushion distortion, while also enhancing the system's global correction capability for spherical aberration through refractive power reversal.

[0086] like Figure 3As shown, the sixth lens L6 can have negative refractive power, which is beneficial for eliminating chromatic aberration in the optical lens 300. In another embodiment, the sixth lens L6 can also have positive refractive power for fine-tuning the focusing position. The object-side surface S11 of the sixth lens L6 can be concave, convex, or flat near the optical axis O, and the image-side surface S12 of the sixth lens L6 can be concave, convex, or flat near the optical axis O; this embodiment does not limit this.

[0087] like Figure 3 As shown, the fifth lens L5, which has positive refractive power, can be cemented with the sixth lens L6, which has negative refractive power, to form a cemented doublet lens. This is beneficial for reducing chromatic aberration and correcting spherical aberration of the optical lens 300, thereby improving the resolution of the optical lens 300. In another embodiment, the fifth lens L5 and the sixth lens L6 can also be independent lenses.

[0088] like Figure 3 As shown, the seventh lens L7 can have negative refractive power, which is beneficial for eliminating chromatic aberration in the optical lens 300. In another embodiment, the seventh lens L7 can also have positive refractive power for fine-tuning the focus position. The object-side surface S13 of the seventh lens L7 can be concave, convex, or flat near the optical axis O, and the image-side surface S14 of the seventh lens L7 can be concave, convex, or flat near the optical axis O; this embodiment does not limit this.

[0089] like Figure 3 As shown, the refractive power of the eighth lens L8 can be determined as needed, for example, it can be positive refractive power. The image-side surface S16 of the eighth lens L8 is convex at the near-optical axis O. With the above settings, the angle at which the principal ray is incident on the image plane can be adjusted, which helps to eliminate field curvature and distortion of the optical lens 300.

[0090] like Figure 3 As shown, the seventh lens L7, which has negative refractive power, can be cemented with the eighth lens L8, which has positive refractive power, to form a cemented doublet lens. This is beneficial for reducing chromatic aberration and correcting spherical aberration of the optical lens 300, thereby improving the resolution of the optical lens 300. In another embodiment, the seventh lens L7 and the eighth lens L8 can also be independent lenses.

[0091] like Figure 3 As shown, the refractive power of the ninth lens L9 can be determined as needed, for example, it can be a negative refractive power. The image-side surface of the ninth lens L9 is convex at the near-optical axis O. With the above settings, it is beneficial to control the light to arrive at the image plane at a near-vertical angle, reduce the impact of aberrations on edge image quality, and thus improve the imaging quality of the optical lens 300.

[0092] refer to Figure 1 and Figure 3As shown, the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, and ninth lens L9 can all be made of glass. This allows the optical lens 300 to have good optical performance while reducing the impact of temperature on the lenses. The optical lens 300 can achieve clear imaging in environments ranging from -40°C to 105°C. In another embodiment, some lenses of the optical lens 300 can be made of glass, while others can be made of plastic. This ensures that while reducing the impact of temperature on the lenses to achieve good image quality, it also reduces the manufacturing cost and weight of the optical lens 300. In another embodiment, the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, and ninth lens L9 can be made of plastic to reduce the overall weight of the optical lens 300.

[0093] refer to Figure 3 As shown, in one embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 can all be spherical lenses. Spherical lenses have the advantages of simple manufacturing process and low production cost, which is beneficial for the large-scale mass production of the optical lens 300. It is understood that, in another embodiment, the surface of each lens in the optical lens 300 can be all spherical, all aspherical, or any combination of spherical and aspherical surfaces, which can be selected according to actual needs, and therefore is not specifically limited in this embodiment.

[0094] like Figure 3 As shown, in one embodiment, the optical lens 300 may further include an aperture stop STO, which may be an aperture stop and / or a field stop. For example, the aperture stop STO may be an aperture stop, or a field stop, or both an aperture stop and a field stop. The aperture stop STO can be used to adjust the amount of light transmitted by the optical lens 300. The position of the aperture stop STO can be determined according to product needs, for example, it may be located between the third lens L3 and the fourth lens L4. In another embodiment, the aperture stop STO may be located between the sixth lens L6 and the seventh lens L7, or between any two adjacent lenses, or on the object side of the first lens L1; this embodiment does not limit this.

[0095] like Figure 3As shown, in one embodiment, the optical lens 300 may further include an infrared filter (IR), which may be disposed between the ninth lens L9 and the imaging surface IMG of the optical lens 300. For example, the IR filter may be an infrared cut-off filter to filter out infrared light, allowing visible light to pass through, making the image more consistent with the visual experience of the human eye, thereby improving image quality. In another embodiment, the IR filter may be an infrared bandpass filter to allow infrared light to pass through and reflect visible light, thereby achieving infrared imaging of the optical lens 300, enabling the optical lens 300 to image in low-light environments or special application scenarios and obtain better image quality. It is understood that the IR filter may be made of plastic, optical glass with a coating, or other materials, and can be selected according to actual needs; this embodiment does not impose specific limitations. In another embodiment, the optical lens 300 may not include an IR filter.

[0096] Combination Figure 2 and Figure 3 As shown, in one embodiment, the optical lens 300 may further include a protective glass (CG). The protective glass CG can be disposed between the filter IR and the imaging surface IMG of the optical lens 300, thereby protecting and dustproofing the photosensitive chip 201. The protective glass CG can be made of plastic, optical glass with a coating, or other materials, and can be selected according to actual needs. This embodiment does not impose specific limitations. It is understood that the protective glass CG can be part of the optical lens 300 or can be removed from the optical lens 300, but when the protective glass CG is removed, the total optical length (TTL) of the optical lens 300 remains unchanged.

[0097] In this embodiment, the maximum field of view (FOV) of the optical lens 300 satisfies the relationship: 18deg≤FOV≤26deg. When the optical lens 300 satisfies the above relationship, it can meet the characteristics of a telephoto lens and has a large field of view, which is beneficial to increasing the field of view range of the optical lens 300.

[0098] In this embodiment, the aperture number FNO of the optical lens 300 satisfies the relationship: 1.5 ≤ FNO ≤ 1.7. When the optical lens 300 satisfies the above relationship, the optical lens 300 has a large light transmission capacity, which can improve the exposure efficiency of the optical lens 300 under low light conditions (such as at night, in tunnels, rainy or foggy weather, etc.), while ensuring good resolution and improving the imaging quality of the optical lens 300.

[0099] By controlling the field of view (FOV) and aperture number (FNO) of the optical lens 300 within the aforementioned range, this embodiment enables the optical lens 300 to expand the field of view while satisfying the telephoto requirement, and also ensures sufficient light transmission under low-light conditions, which is beneficial to improving the imaging quality of the optical lens 300.

[0100] In some embodiments, the total optical length (TTL) of the optical lens 300 and the effective focal length (F) of the optical lens 300 can satisfy the relationship: 1.1 ≤ TTL / F ≤ 1.55. By limiting the ratio of the total optical length (TTL) to the effective focal length (F) of the optical lens 300 to the above range, the optical lens 300 can meet the characteristics of a telephoto lens.

[0101] In some embodiments, the effective focal length F of the optical lens 300 and half the image height ImgH corresponding to the maximum field of view of the optical lens 300 can satisfy the relationship: 4.3 ≤ F / ImgH ≤ 6.1. By limiting F / ImgH to the above range, it is beneficial for the optical lens to meet the requirements of high image sharpness while having a large depth of field.

[0102] In some embodiments, the maximum field of view (FOV) of the optical lens 300 and the aperture number (FNO) of the optical lens 300 can satisfy the following relationship: 10.5deg ≤ FOV / FNO ≤ 17deg. By limiting FOV / FNO to the above range, the optical lens can achieve a balance between field of view and light transmission, optimize depth of field, improve optical performance in low light, and reduce distortion.

[0103] In some embodiments, the focal length F1 of the first lens L1 and the thickness CT1 of the first lens L1 on the optical axis O can satisfy the relationship: 6.5 ≤ F1 / CT1 ≤ 11.5. By limiting F1 / CT1 to the above range, the aberrations introduced by the first lens L1 can be reduced while ensuring sufficient focal length.

[0104] In some embodiments, the focal length F1 of the first lens L1 and the thickness CT1 of the first lens L1 on the optical axis O can satisfy the relationship: 1.9 ≤ F5 / CT5 ≤ 6.8. By limiting F5 / CT5 to the above range, system aberrations of the optical lens 300 can be corrected while ensuring sufficient focal length.

[0105] In some embodiments, the thickness CT5 of the fifth lens L5 on the optical axis O and the thickness CT6 of the sixth lens L6 on the optical axis O can satisfy the relationship: 0.8 ≤ CT5 / CT6 ≤ 6. By limiting CT5 / CT6 to the above range, the total thickness of the fifth lens L5 and the sixth lens L6 can be reduced, which is beneficial for the miniaturization of the optical lens 300.

[0106] In some embodiments, the radius of curvature R11 of the object-side surface S11 of the sixth lens L6 at the optical axis and the radius of curvature R12 of the image-side surface S12 of the sixth lens L6 at the optical axis can satisfy the relationship: 0.8≤|(R11-R12) / (R11+R12)|≤11. When the optical lens 300 satisfies the above relationship, it is beneficial to reasonably control the radii of curvature of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 at the optical axis, thereby effectively controlling the shape of the sixth lens L6, allowing the sixth lens L6 to refract incident light more gently, and avoiding increased aberrations. If the curvature of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 at the optical axis O differs too much, the object-side surface S11 or the image-side surface S12 of the sixth lens L6 is too flat, the refraction of the incident light by the sixth lens L6 is weakened, which is not conducive to controlling the total optical length TTL; if the curvature of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 at the optical axis O differs too little, the bending of the light by the sixth lens L6 is too large, and it is easy to produce ghosting by reflecting with other lenses.

[0107] In some embodiments, the radius of curvature R9 of the object-side surface S9 of the fifth lens L5 at the optical axis and the radius of curvature R10 of the image-side surface S10 of the fifth lens L5 at the optical axis can satisfy the relationship: -1.7 ≤ R9 / R10 ≤ -0.3. By limiting R9 / R10 to the above range, the refractive power of the fifth lens L5 of the optical lens 300 can be uniformly configured, which is beneficial to reducing field astigmatism and distortion of the optical lens 300.

[0108] In some embodiments, the radius of curvature R18 of the image-side surface S18 of the ninth lens L9 at the optical axis and the radius of curvature R17 of the object-side surface S17 of the ninth lens L9 at the optical axis can satisfy the relationship: 2.4 ≤ |R18 / R17| ≤ 4. By limiting |R18 / R17| to the above range, the refractive power of the ninth lens L9 of the optical lens 300 can be uniformly configured, which is beneficial to reducing field astigmatism and distortion of the optical lens 300.

[0109] In some embodiments, the combined focal length F23 of the second lens L2 and the third lens L3, and the effective focal length F of the optical lens 300, can satisfy the relationship: 0.95 ≤ |F23 / F| ≤ 20. By limiting |F23 / F| to the above range, excessive spherical aberration introduced by the second lens L2 and the third lens L3 can be avoided, thereby improving the resolving power of the optical lens 300.

[0110] In some embodiments, the radius of curvature R16 of the image-side surface S16 of the eighth lens L8 at the optical axis and the effective focal length F of the optical lens 300 can satisfy the relationship: -14≤R16 / F≤-0.5. By limiting R16 / F to the above range, it can be ensured that the light converges smoothly to the sensor target surface, making the structure of the optical lens 300 more compact.

[0111] In some embodiments, the focal length F9 of the ninth lens L9 and the effective focal length F of the optical lens 300 can satisfy the relationship: 0.9 ≤ |F / F9| ≤ 2.1. By limiting |F / F9| to the above range, astigmatism and chromatic aberration of the optical lens 300 can be reduced, while the edge thickness of the ninth lens L9 can be reduced to make the structure of the optical lens 300 more compact.

[0112] In some embodiments, the thickness of the first lens L1 along the optical axis O and the sagitta SAGS1 of the effective optical diameter edge of the object-side surface S1 of the first lens L1 can satisfy the relationship: 1.1 ≤ CT1 / SAGS1 ≤ 2. Limiting CT1 / SAGS1 to the above range helps control the curvature of the object-side surface S1 of the first lens L1, thereby controlling the aperture of the first lens L1 and facilitating its manufacturing. When the ratio of CT1 to SAGS1 is lower than the lower limit of the above relationship, the object-side surface S1 of the first lens L1 is too curved, which is detrimental to the surface shape control of the first lens L1 and increases the risk of ghosting. When the ratio of CT1 to SAGS1 exceeds the upper limit of the above relationship, the first lens L1 is too thick, which is detrimental to the miniaturization of the optical lens 300.

[0113] In some embodiments, the thickness of the third lens L3 along the optical axis O, and the distance from the maximum effective aperture of the object side S5 of the third lens L3 to the maximum effective aperture of the image side S6 of the third lens L3 along the optical axis O (i.e., the edge thickness of the lens), can satisfy the relationship: 0.29≤CT3 / ET3≤0.75. By limiting CT3 / ET3 to the above range, the ratio of the center thickness to the edge thickness of the third lens L3 can be reasonably controlled, thereby making the overall thickness of the third lens L3 reasonable and facilitating the miniaturization design of the optical lens 300.

[0114] In some embodiments, the thickness of the ninth lens L9 along the optical axis O, and the distance from the maximum effective aperture of the object-side surface S17 of the ninth lens L9 to the maximum effective aperture of the image-side surface S18 of the ninth lens L9 along the optical axis O, can satisfy the relationship: 0.45≤CT9 / ET9≤1.5. By limiting CT9 / ET9 to the above range, the ratio of the center thickness to the edge thickness of the ninth lens L9 can be reasonably controlled, thereby making the overall thickness of the ninth lens L9 reasonable and facilitating the miniaturization design of the optical lens 300.

[0115] In some embodiments, half the maximum effective aperture of the object side surface S1 of the first lens L1, and half the image height ImgH corresponding to the maximum field of view of the optical lens 300, can satisfy the relationship: 1.55≤SD1 / ImgH≤1.95. By limiting SD1 / ImgH to the above range, the optical lens 300 can meet the requirements of adapting to a large imaging surface IMG, while also taking into account the miniaturization design of the side of the optical lens 300 away from the imaging surface.

[0116] In some embodiments, the total optical length (TTL) of the optical lens 300 and the back focal length (BFL) of the optical lens can satisfy the relationship: 9.7 ≤ TTL / BFL ≤ 15.7. By limiting TTL / BFL to the above range, it is beneficial for the optical lens 300 to have a more compact structure while satisfying the telephoto characteristics.

[0117] In some embodiments, half the maximum effective aperture SD12 of the image-side surface S12 of the sixth lens L6 and half the maximum effective aperture SD13 of the object-side surface S13 of the seventh lens L7 can satisfy the relationship: 0.8 ≤ SD12 / SD13 ≤ 1.1. By limiting SD12 / SD13 to the above range, it is beneficial to reduce the sensitivity of system tolerances (e.g., eccentricity tolerance and tilt tolerance) and to improve the resolution of the optical lens 300.

[0118] In some embodiments, the total optical length (TTL) of the optical lens 300 and half the image height (ImgH) corresponding to the maximum field of view of the optical lens 300 can satisfy the relationship: 6.4 ≤ TTL / ImgH ≤ 6.9. By limiting TTL / ImgH to the above range, the optical lens 300 can meet both the requirements of high pixel count and miniaturization.

[0119] In some embodiments, the total optical length TTL of the optical lens 300 is equal to the maximum thickness CT of the first lens L1 to the ninth lens L9 of the optical lens 300 along the optical axis O. max It can satisfy the relation: 7.7≤TTL / CT max ≤9.2. By using TTL / CT max Limiting it to the above range is beneficial for achieving miniaturization of the optical lens 300 and synergistic optimization of its optical performance.

[0120] In some embodiments, the maximum thickness CT of the first lens L1 to the ninth lens L9 of the optical lens 300 on the optical axis O is... max The minimum thickness CT of the first lens L1 to the ninth lens L9 of optical lens 300 on the optical axis O. min It can satisfy the relation: 4.6≤CT max / CTmin ≤5.9. By using CT max / CT min Limiting the lens thickness to the above range allows for a reasonable distribution of lens thickness, which helps reduce aberrations in the optical lens.

[0121] In some embodiments, the focal length F1 of the first lens L1 and the effective focal length F of the optical lens 300 can satisfy the relationship: 0.9 ≤ F1 / F ≤ 1.2. By limiting F1 / F to the above range, excessive spherical aberration can be avoided by the first lens L1, and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0122] In some embodiments, the focal length F2 of the second lens L2 and the effective focal length F of the optical lens 300 can satisfy the relationship: 0.5 ≤ F2 / F ≤ 1.1. By limiting F2 / F to the above range, excessive spherical aberration can be avoided by the second lens L2, and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0123] In some embodiments, the focal length F3 of the third lens L3 and the effective focal length F of the optical lens 300 can satisfy the relationship: -2.6 ≤ F3 / F ≤ -0.35. By limiting F3 / F to the above range, excessive spherical aberration introduced by the third lens L3 can be avoided and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0124] In some embodiments, the focal length F4 of the fourth lens L4 and the effective focal length F of the optical lens 300 can satisfy the relationship: -1.5 ≤ F4 / F ≤ -0.35. By limiting F4 / F to the above range, excessive spherical aberration introduced by the fourth lens L4 can be avoided and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0125] In some embodiments, the focal length F5 of the fifth lens L5 and the effective focal length F of the optical lens 300 can satisfy the relationship: 0.3 ≤ F5 / F ≤ 0.7. By limiting F5 / F to the above range, excessive spherical aberration can be avoided by the fifth lens L5, and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0126] In some embodiments, the focal length F6 of the sixth lens L6 and the effective focal length F of the optical lens 300 can satisfy the relationship: 0.2 ≤ |F6 / F| ≤ 1.1. By limiting |F6 / F| to the above range, excessive spherical aberration introduced by the sixth lens L6 can be avoided and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0127] In some embodiments, the focal length F7 of the seventh lens L7 and the effective focal length F of the optical lens 300 can satisfy the relationship: 0.25 ≤ |F7 / F| ≤ 2.6. By limiting |F7 / F| to the above range, excessive spherical aberration introduced by the seventh lens L7 can be avoided and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0128] In some embodiments, the focal length F8 of the eighth lens L8 and the effective focal length F of the optical lens 300 can satisfy the relationship: 0.27 ≤ |F8 / F| ≤ 1.65. By limiting |F8 / F| to the above range, excessive spherical aberration introduced by the eighth lens L8 can be avoided and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0129] In some embodiments, the radius of curvature R2 of the image-side surface S2 of the first lens L1 at the optical axis and the radius of curvature R1 of the object-side surface S1 of the first lens L1 at the optical axis can satisfy the relationship: 2.5 ≤ R2 / R1 ≤ 17.5. By limiting R2 / R1 to the above range, the refractive power of the first lens L1 of the optical lens 300 can be uniformly configured, which is beneficial to reducing field astigmatism and distortion of the optical lens.

[0130] In some embodiments, the radius of curvature R4 of the image-side surface S4 of the second lens L2 at the optical axis and the radius of curvature R3 of the object-side surface S3 of the second lens L2 at the optical axis can satisfy the relationship: 4 ≤ |R4 / R3| ≤ 175. By limiting |R4 / R3| to the above range, the refractive power of the second lens L2 of the optical lens 300 can be uniformly configured, which is beneficial to reducing field astigmatism and distortion of the optical lens.

[0131] In some embodiments, the radius of curvature R5 of the object-side surface S5 of the third lens L3 at the optical axis and the radius of curvature R6 of the image-side surface S6 of the third lens L3 at the optical axis can satisfy the relationship: 2.5 ≤ |R5 / R6| ≤ 95. By limiting |R5 / R6| to the above range, the refractive power of the third lens L3 of the optical lens 300 can be uniformly configured, which is beneficial to reducing field astigmatism and distortion of the optical lens.

[0132] In some embodiments, the radius of curvature R7 of the object-side surface S7 of the fourth lens L4 at the optical axis and the radius of curvature R8 of the image-side surface S8 of the fourth lens L4 at the optical axis can satisfy the relationship: 0.45≤|R7 / R8|≤5.7. By limiting |R7 / R8| to the above range, the refractive power of the fourth lens L4 of the optical lens 300 can be uniformly configured, which is beneficial to reducing field astigmatism and distortion of the optical lens.

[0133] In some embodiments, the radius of curvature R11 of the object-side surface S11 of the sixth lens L6 at the optical axis and the radius of curvature R12 of the image-side surface S12 of the sixth lens L6 at the optical axis can satisfy the relationship: 0.2 ≤ |R11 / R12| ≤ 12. By limiting |R11 / R12| to the above range, the refractive power of the sixth lens L6 of the optical lens 300 can be uniformly configured, which is beneficial to reducing field astigmatism and distortion of the optical lens.

[0134] In some embodiments, the radius of curvature R13 of the object-side surface S13 of the seventh lens L7 at the optical axis and the radius of curvature R14 of the image-side surface S14 of the seventh lens L7 at the optical axis can satisfy the relationship: 0.5 ≤ |R13 / R14| ≤ 3.8. By limiting |R13 / R14| to the above range, the refractive power of the seventh lens L7 of the optical lens 300 can be uniformly configured, which is beneficial to reducing field astigmatism and distortion of the optical lens.

[0135] In some embodiments, the radius of curvature R16 of the image-side surface S16 of the eighth lens L8 at the optical axis and the radius of curvature R15 of the object-side surface S15 of the eighth lens L8 at the optical axis can satisfy the relationship: 1.6 ≤ |R16 / R15| ≤ 14.5. By limiting |R16 / R15| to the above range, the refractive power of the eighth lens L8 of the optical lens 300 can be uniformly configured, which is beneficial to reducing field astigmatism and distortion of the optical lens.

[0136] The optical lens 300 of this embodiment will be described in detail below with reference to specific parameters.

[0137] First Embodiment

[0138] like Figure 3 As shown, in the first embodiment, the optical lens 300 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a filter IR, and a protective glass CG, arranged sequentially along the optical axis O from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has negative refractive power, the eighth lens L8 has positive refractive power, and the ninth lens L9 has negative refractive power.

[0139] like Figure 3 As shown, in the first embodiment, the aperture STO is located between the third lens L3 and the fourth lens L4.

[0140] like Figure 3As shown, the object-side surface S1 of the first lens L1 is convex near the optical axis O, and the image-side surface S2 of the first lens L1 is concave near the optical axis O; the object-side surface S3 of the second lens L2 is convex near the optical axis O, and the image-side surface S4 of the second lens L2 is convex near the optical axis O; the object-side surface S5 of the third lens L3 is concave near the optical axis O, and the image-side surface S6 of the third lens L3 is concave near the optical axis O; the object-side surface S7 of the fourth lens L4 is convex near the optical axis O, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis O; the object-side surface S9 of the fifth lens L5 is convex near the optical axis O, and the fifth lens... The image-side surface S10 of lens L5 is convex near the optical axis O; the object-side surface S11 of the sixth lens L6 is concave near the optical axis O, and the image-side surface S12 of the sixth lens L6 is concave near the optical axis O; the object-side surface S13 of the seventh lens L7 is convex near the optical axis O, and the image-side surface S14 of the seventh lens L7 is concave near the optical axis O; the object-side surface S15 of the eighth lens L8 is convex near the optical axis O, and the image-side surface S16 of the eighth lens L8 is convex near the optical axis O; the object-side surface S17 of the ninth lens L9 is concave near the optical axis O, and the image-side surface S18 of the ninth lens L9 is convex near the optical axis O.

[0141] In Table 1, the Y-radius refers to the radius of curvature of the object-side or image-side surface of the corresponding facet at the optical axis O. The first value in the "Thickness" parameter column for a lens is its thickness along the optical axis O, i.e., the center thickness of the lens; the second value is the distance from the image-side surface of the lens to the rear surface along the optical axis O. The value for the aperture stop STO in the "Thickness" parameter column is the distance from the aperture stop STO to the vertex of the rear surface (the vertex being the intersection of the surface and the optical axis O) along the optical axis O. It is understood that the units for the Y-radius, thickness, and focal length in Table 1 are all mm, and the reference wavelength for the refractive index, Abbe number, and focal length of each lens in Table 1 is 558 nm.

[0142]

[0143] Table 1. Partial parameters of the optical lens in the first embodiment.

[0144] Figure 4 The imaging quality of the optical lens 300 in the first embodiment was characterized. Figure 4 Figure (A) illustrates the longitudinal spherical aberration curves of the optical lens 300 in the first embodiment at wavelengths of 661 nm, 614 nm, 558 nm, 502 nm, 455 nm, 435 nm, and 415 nm. The horizontal axis represents the focus shift in mm, and the vertical axis represents the normalized field of view. Figure 4 As shown in (A), the spherical aberration value of the optical lens 300 in the first embodiment is better, indicating that the imaging quality of the optical lens 300 in this embodiment is better.

[0145] Figure 4 Figure (B) illustrates the astigmatism curve of the optical lens 300 in the first embodiment at a wavelength of 558 nm. The horizontal axis represents the focus shift in mm, and the vertical axis represents the field of view in degrees. In the astigmatism curve, T represents the curvature of the imaging plane IMG in the meridional direction, and S represents the curvature of the imaging plane IMG in the sagittal direction. Figure 4 As shown in (B) in the figure, the astigmatism of the optical lens 300 is well compensated at this wavelength.

[0146] Figure 4 (C) in the diagram illustrates the distortion curve of the optical lens 300 in the first embodiment at a wavelength of 558 nm. The horizontal axis represents distortion in %, and the vertical axis represents the field of view in degrees. Figure 4 As shown in (C), at this wavelength, the distortion of the optical lens 300 is well corrected.

[0147] Second Embodiment

[0148] like Figure 5 As shown, in the second embodiment, the optical lens 300 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, an aperture stop STO, a seventh lens L7, an eighth lens L8, a ninth lens L9, a filter IR, and a protective glass CG, arranged sequentially along the optical axis O from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has negative refractive power, the eighth lens L8 has positive refractive power, and the ninth lens L9 has negative refractive power.

[0149] like Figure 5As shown, the object-side surface S1 of the first lens L1 is convex near the optical axis O, and the image-side surface S2 of the first lens L1 is concave near the optical axis O; the object-side surface S3 of the second lens L2 is convex near the optical axis O, and the image-side surface S4 of the second lens L2 is convex near the optical axis O; the object-side surface S5 of the third lens L3 is concave near the optical axis O, and the image-side surface S6 of the third lens L3 is concave near the optical axis O; the object-side surface S7 of the fourth lens L4 is convex near the optical axis O, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis O; the object-side surface S9 of the fifth lens L5 is convex near the optical axis O, and the fifth lens... The image-side surface S10 of lens L5 is convex near the optical axis O; the object-side surface S11 of the sixth lens L6 is concave near the optical axis O, and the image-side surface S12 of the sixth lens L6 is concave near the optical axis O; the object-side surface S13 of the seventh lens L7 is convex near the optical axis O, and the image-side surface S14 of the seventh lens L7 is concave near the optical axis O; the object-side surface S15 of the eighth lens L8 is convex near the optical axis O, and the image-side surface S16 of the eighth lens L8 is convex near the optical axis O; the object-side surface S17 of the ninth lens L9 is concave near the optical axis O, and the image-side surface S18 of the ninth lens L9 is convex near the optical axis O.

[0150] Table 2 shows some parameters of the optical lens 300 in the second embodiment. The meaning of each parameter is referred to in Table 1 and will not be repeated here.

[0151]

[0152] Table 2 shows some parameters of the optical lens in the second embodiment.

[0153] Please see Figure 6 ,from Figure 6 As can be seen from (A) the spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the spherical aberration, astigmatism, and distortion of the optical lens 300 are well controlled, thus the optical lens 300 of the second embodiment has good imaging quality. Furthermore, regarding... Figure 6 (A) Figure 6 (B) and Figure 6 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 4 (A) Figure 4 (B) Figure 4 The content described in (C) will not be repeated here.

[0154] Third Embodiment

[0155] like Figure 7As shown, in the third embodiment, the optical lens 300 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a filter IR, arranged sequentially along the optical axis O from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, the eighth lens L8 has negative refractive power, and the ninth lens L9 has positive refractive power.

[0156] like Figure 7 As shown, the object-side surface S1 of the first lens L1 is convex near the optical axis O, and the image-side surface S2 of the first lens L1 is concave near the optical axis O; the object-side surface S3 of the second lens L2 is convex near the optical axis O, and the image-side surface S4 of the second lens L2 is convex near the optical axis O; the object-side surface S5 of the third lens L3 is concave near the optical axis O, and the image-side surface S6 of the third lens L3 is concave near the optical axis O; the object-side surface S7 of the fourth lens L4 is concave near the optical axis O, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis O; the object-side surface S9 of the fifth lens L5 is convex near the optical axis O, and the fifth lens... The image-side surface S10 of lens L5 is convex near the optical axis O; the object-side surface S11 of the sixth lens L6 is convex near the optical axis O, and the image-side surface S12 of the sixth lens L6 is concave near the optical axis O; the object-side surface S13 of the seventh lens L7 is convex near the optical axis O, and the image-side surface S14 of the seventh lens L7 is convex near the optical axis O; the object-side surface S15 of the eighth lens L8 is concave near the optical axis O, and the image-side surface S16 of the eighth lens L8 is convex near the optical axis O; the object-side surface S17 of the ninth lens L9 is convex near the optical axis O, and the image-side surface S18 of the ninth lens L9 is convex near the optical axis O.

[0157] In Table 3, the Y-radius refers to the radius of curvature of the object-side or image-side surface of the corresponding surface number at optical axis O. The first value in the "Thickness" parameter column for a lens is its thickness along optical axis O, and the second value is the distance from the image-side surface of the lens to the rear surface along optical axis O. The value for the aperture stop STO in the "Thickness" parameter column is the distance from the aperture stop STO to the vertex of the rear surface (the vertex being the intersection of the surface and optical axis O) along optical axis O. It is understood that the units for the Y-radius, thickness, and focal length in Table 3 are all mm, and the reference wavelength for the refractive index, Abbe number, and focal length of each lens in Table 3 is 546 nm.

[0158]

[0159] Table 3 shows some parameters of the optical lens in the third embodiment.

[0160] Figure 8 The imaging quality of the optical lens 300 in the third embodiment was characterized. Figure 8 Figure (A) illustrates the longitudinal spherical aberration curves of the optical lens 300 in the third embodiment at wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 436 nm. The horizontal axis represents the focus shift in mm, and the vertical axis represents the normalized field of view. Figure 8 As shown in (A), the spherical aberration value of the optical lens 300 in the third embodiment is better, indicating that the imaging quality of the optical lens 300 in this embodiment is better.

[0161] Figure 8 Figure (B) illustrates the astigmatism curve of the optical lens 300 in the third embodiment at a wavelength of 546 nm. The horizontal axis represents the focus shift in mm, and the vertical axis represents the field of view in degrees. In the astigmatism curve, T represents the curvature of the imaging plane IMG in the meridional direction, and S represents the curvature of the imaging plane IMG in the sagittal direction. Figure 8 As shown in (B) in the figure, the astigmatism of the optical lens 300 is well compensated at this wavelength.

[0162] Figure 8 Figure (C) illustrates the distortion curve of the optical lens 300 in the third embodiment at a wavelength of 546 nm. The horizontal axis represents distortion in %, and the vertical axis represents the field of view in degrees. Figure 9 As shown in (C), at this wavelength, the distortion of the optical lens 300 is well corrected.

[0163] Fourth embodiment

[0164] like Figure 9 As shown, in the fourth embodiment, the optical lens 300 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a filter IR, arranged sequentially along the optical axis O from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, the eighth lens L8 has negative refractive power, and the ninth lens L9 has negative refractive power.

[0165] like Figure 10As shown, the object-side surface S1 of the first lens L1 is convex near the optical axis O, and the image-side surface S2 of the first lens L1 is concave near the optical axis O; the object-side surface S3 of the second lens L2 is convex near the optical axis O, and the image-side surface S4 of the second lens L2 is concave near the optical axis O; the object-side surface S5 of the third lens L3 is convex near the optical axis O, and the image-side surface S6 of the third lens L3 is concave near the optical axis O; the object-side surface S7 of the fourth lens L4 is convex near the optical axis O, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis O; the object-side surface S9 of the fifth lens L5 is convex near the optical axis O, and the fifth lens... The image-side surface S10 of lens L5 is convex near the optical axis O; the object-side surface S11 of the sixth lens L6 is concave near the optical axis O, and the image-side surface S12 of the sixth lens L6 is concave near the optical axis O; the object-side surface S13 of the seventh lens L7 is convex near the optical axis O, and the image-side surface S14 of the seventh lens L7 is convex near the optical axis O; the object-side surface S15 of the eighth lens L8 is concave near the optical axis O, and the image-side surface S16 of the eighth lens L8 is convex near the optical axis O; the object-side surface S17 of the ninth lens L9 is concave near the optical axis O, and the image-side surface S18 of the ninth lens L9 is convex near the optical axis O.

[0166] Table 4 shows some parameters of the optical lens 300 in the fourth embodiment. The meaning of each parameter is referred to in Table 1 and will not be repeated here.

[0167]

[0168]

[0169] Table 4 shows some parameters of the optical lens in the fourth embodiment.

[0170] Please see Figure 10 ,from Figure 10 As can be seen from (A) the spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the spherical aberration, astigmatism, and distortion of the optical lens 300 are well controlled, thus the optical lens 300 of the fourth embodiment has good imaging quality. Furthermore, regarding... Figure 10 (A) Figure 10 (B) and Figure 4 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 4 (A) Figure 4 (B) Figure 11 The content described in (C) will not be repeated here.

[0171] Fifth embodiment

[0172] like Figure 11As shown, in the fifth embodiment, the optical lens 300 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a filter IR, arranged sequentially along the optical axis O from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has negative refractive power, the eighth lens L8 has positive refractive power, and the ninth lens L9 has negative refractive power.

[0173] like Figure 12 As shown, the object-side surface S1 of the first lens L1 is convex near the optical axis O, and the image-side surface S2 of the first lens L1 is concave near the optical axis O; the object-side surface S3 of the second lens L2 is convex near the optical axis O, and the image-side surface S4 of the second lens L2 is concave near the optical axis O; the object-side surface S5 of the third lens L3 is convex near the optical axis O, and the image-side surface S6 of the third lens L3 is concave near the optical axis O; the object-side surface S7 of the fourth lens L4 is convex near the optical axis O, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis O; the object-side surface S9 of the fifth lens L5 is convex near the optical axis O, and the fifth lens... The image-side surface S10 of lens L5 is convex near the optical axis O; the object-side surface S11 of the sixth lens L6 is concave near the optical axis O, and the image-side surface S12 of the sixth lens L6 is concave near the optical axis O; the object-side surface S13 of the seventh lens L7 is convex near the optical axis O, and the image-side surface S14 of the seventh lens L7 is concave near the optical axis O; the object-side surface S15 of the eighth lens L8 is convex near the optical axis O, and the image-side surface S16 of the eighth lens L8 is convex near the optical axis O; the object-side surface S17 of the ninth lens L9 is concave near the optical axis O, and the image-side surface S18 of the ninth lens L9 is convex near the optical axis O.

[0174] Table 5 shows some parameters of the optical lens 300 in the fifth embodiment. The meaning of each parameter is referred to in Table 1 and will not be repeated here.

[0175]

[0176]

[0177] Table 5 shows some parameters of the optical lens in the fifth embodiment.

[0178] Please see Figure 12 ,from Figure 12As can be seen from (A) the spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the spherical aberration, astigmatism, and distortion of the optical lens 300 are well controlled, thus the optical lens 300 of the fifth embodiment has good imaging quality. Furthermore, regarding... Figure 12 (A) Figure 12 (B) and Figure 4 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 4 (A) Figure 4 (B) Figure 13 The content described in (C) will not be repeated here.

[0179] Sixth Embodiment

[0180] like Figure 13 As shown, in the sixth embodiment, the optical lens 300 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a filter IR, and a protective glass CG, arranged sequentially along the optical axis O from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, the eighth lens L8 has negative refractive power, and the ninth lens L9 has negative refractive power.

[0181] like Figure 14 As shown, the object-side surface S1 of the first lens L1 is convex near the optical axis O, and the image-side surface S2 of the first lens L1 is concave near the optical axis O; the object-side surface S3 of the second lens L2 is convex near the optical axis O, and the image-side surface S4 of the second lens L2 is convex near the optical axis O; the object-side surface S5 of the third lens L3 is concave near the optical axis O, and the image-side surface S6 of the third lens L3 is concave near the optical axis O; the object-side surface S7 of the fourth lens L4 is convex near the optical axis O, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis O; the object-side surface S9 of the fifth lens L5 is convex near the optical axis O, and the fifth lens... The image-side surface S10 of lens L5 is convex near the optical axis O; the object-side surface S11 of the sixth lens L6 is concave near the optical axis O, and the image-side surface S12 of the sixth lens L6 is concave near the optical axis O; the object-side surface S13 of the seventh lens L7 is convex near the optical axis O, and the image-side surface S14 of the seventh lens L7 is convex near the optical axis O; the object-side surface S15 of the eighth lens L8 is concave near the optical axis O, and the image-side surface S16 of the eighth lens L8 is convex near the optical axis O; the object-side surface S17 of the ninth lens L9 is concave near the optical axis O, and the image-side surface S18 of the ninth lens L9 is convex near the optical axis O.

[0182] Table 6 shows some parameters of the optical lens 300 in the sixth embodiment. The meaning of each parameter is referred to in Table 1 and will not be repeated here.

[0183]

[0184]

[0185] Table 6 shows some parameters of the optical lens in the sixth embodiment.

[0186] Figure 14 The imaging quality of the optical lens 300 in the sixth embodiment was characterized. Figure 14 Figure (A) illustrates the longitudinal spherical aberration curves of the optical lens 300 in the sixth embodiment at wavelengths of 661 nm, 614 nm, 558 nm, 502 nm, and 455 nm. The horizontal axis represents the focus shift in mm, and the vertical axis represents the normalized field of view. Figure 14 As shown in (A), the spherical aberration value of the optical lens 300 in the sixth embodiment is better, indicating that the imaging quality of the optical lens 300 in this embodiment is better.

[0187] Figure 14 Figure (B) illustrates the astigmatism curve of the optical lens 300 in the sixth embodiment at a wavelength of 558 nm. The horizontal axis represents the focus shift in mm, and the vertical axis represents the field of view in degrees. In the astigmatism curve, T represents the curvature of the imaging plane IMG in the meridional direction, and S represents the curvature of the imaging plane IMG in the sagittal direction. Figure 14 As shown in (B) in the figure, the astigmatism of the optical lens 300 is well compensated at this wavelength.

[0188] Figure 15 Figure (C) illustrates the distortion curve of the optical lens 300 in the sixth embodiment at a wavelength of 558 nm. The horizontal axis represents distortion in %, and the vertical axis represents the field of view in degrees. Figure 15 As shown in (C), at this wavelength, the distortion of the optical lens 300 is well corrected.

[0189] Seventh Embodiment

[0190] like Figure 16As shown, in the seventh embodiment, the optical lens 300 includes a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a filter IR, and a protective glass CG, arranged sequentially along the optical axis O from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has positive refractive power, the seventh lens L7 has negative refractive power, the eighth lens L8 has positive refractive power, and the ninth lens L9 has negative refractive power.

[0191] like Figure 16 As shown, the object-side surface S1 of the first lens L1 is convex near the optical axis O, and the image-side surface S2 of the first lens L1 is concave near the optical axis O; the object-side surface S3 of the second lens L2 is convex near the optical axis O, and the image-side surface S4 of the second lens L2 is convex near the optical axis O; the object-side surface S5 of the third lens L3 is concave near the optical axis O, and the image-side surface S6 of the third lens L3 is concave near the optical axis O; the object-side surface S7 of the fourth lens L4 is concave near the optical axis O, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis O; the object-side surface S9 of the fifth lens L5 is convex near the optical axis O, and the fifth lens... The image-side surface S10 of lens L5 is convex near the optical axis O; the object-side surface S11 of the sixth lens L6 is convex near the optical axis O, and the image-side surface S12 of the sixth lens L6 is convex near the optical axis O; the object-side surface S13 of the seventh lens L7 is concave near the optical axis O, and the image-side surface S14 of the seventh lens L7 is convex near the optical axis O; the object-side surface S15 of the eighth lens L8 is convex near the optical axis O, and the image-side surface S16 of the eighth lens L8 is convex near the optical axis O; the object-side surface S17 of the ninth lens L9 is concave near the optical axis O, and the image-side surface S18 of the ninth lens L9 is convex near the optical axis O.

[0192] Table 7 shows some parameters of the optical lens 300 in the seventh embodiment. The meaning of each parameter is referred to in Table 1 and will not be repeated here.

[0193]

[0194]

[0195] Table 7. Partial parameters of the optical lens in the seventh embodiment.

[0196] Please see Figure 16 ,from Figure 16As can be seen from (A) the spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the spherical aberration, astigmatism, and distortion of the optical lens 300 are all well controlled, thus the optical lens 300 of the seventh embodiment has good imaging quality. Furthermore, regarding... Figure 16 (A) Figure 4 (B) and Figure 4 The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 4 (A) ​ (B) ​ The content described in (C) will not be repeated here.

[0197] Table 8 illustrates the FOV, FNO, TTL / F, F / ImgH, FOV / FNO, F1 / CT1, F5 / CT5, CT5 / CT6, |(R11-R12) / (R11+R12)|, R9 / R10, |R18 / R17|, |F23 / F|, R16 / F, |F / F9|, CT1 / SAGS1, CT3 / ET3, CT9 / ET9, SD1 / ImgH, TTL / BFL, SD12 / SD13, TTL / ImgH, TTL / CT in the optical lenses 300 of the first to seventh embodiments. max CT scan max / CT min The values ​​of F1 / F, F2 / F, F3 / F, F4 / F, F5 / F, |F6 / F|, |F7 / F|, |F8 / F|, R2 / R1, |R4 / R3|, |R5 / R6|, |R7 / R8|, |R11 / R12|, |R13 / R14|, and |R16 / R15|. All these values ​​satisfy the relationships described above.

[0198]

[0199]

[0200] Table 8. Partial parameters of the optical lenses in the first to seventh embodiments.

[0201] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.

[0202] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Features specified as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0203] The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," "top," and "bottom," are only for reference to the directions in the accompanying drawings. These directional terms are used to better and more clearly explain and understand the embodiments of this application, and are not intended to explicitly or implicitly suggest that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, etc., and therefore should not be construed as limiting the embodiments of this application.

[0204] In the description of the embodiments in this application, unless otherwise stated, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0205] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical lens, characterized in that, There are nine refractive lenses in total, arranged sequentially from the object side to the image side along the optical axis: The first lens has positive refractive power. The object side of the first lens is convex near the optical axis, and the image side of the first lens is concave near the optical axis. The second lens has positive refractive power, and the object side of the second lens is convex near the optical axis; The third lens has negative refractive power, and the image-side surface of the third lens is concave near the optical axis. The fourth lens has negative refractive power, and the image-side surface of the fourth lens is concave near the optical axis; The fifth lens has positive refractive power. The object-side surface of the fifth lens is convex near the optical axis, and the image-side surface of the fifth lens is convex near the optical axis. The sixth lens has refractive power; The seventh lens has refractive power; The eighth lens has refractive power, and the image-side surface of the eighth lens is convex near the optical axis; The ninth lens has refractive power, and the image-side surface of the ninth lens is convex near the optical axis; The optical lens satisfies the following relationship: 18deg≤FOV≤26deg, 1.5≤FNO≤1.7, 1.1≤TTL / F≤1.55, 6.4≤TTL / ImgH≤6.9; Wherein, FOV is the maximum field of view of the optical lens, FNO is the aperture number of the optical lens, TTL is the total optical length of the optical lens, F is the effective focal length of the optical lens, and ImgH is half the image height corresponding to the maximum field of view of the optical lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 4.3 ≤ F / ImgH ≤ 6.1, and / or, 10.5deg≤FOV / FNO≤17deg; Where F is the effective focal length of the optical lens, and ImgH is half the image height corresponding to the maximum field of view of the optical lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 6.5 ≤ F1 / CT1 ≤ 11.5, and / or, 1.9≤F5 / CT5≤6.8, and / or, 0.8≤CT5 / CT6≤6; Wherein, F1 is the focal length of the first lens, CT1 is the thickness of the first lens on the optical axis, F5 is the focal length of the fifth lens, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 0.8≤|(R11-R12) / (R11+R12)|≤11, and / or, -1.7≤R9 / R10≤-0.3, and / or, 2.4≤|R18 / R17|≤4; Wherein, R11 is the radius of curvature of the object side of the sixth lens at the optical axis, R12 is the radius of curvature of the image side of the sixth lens at the optical axis, R9 is the radius of curvature of the object side of the fifth lens at the optical axis, R10 is the radius of curvature of the image side of the fifth lens at the optical axis, R17 is the radius of curvature of the object side of the ninth lens at the optical axis, and R18 is the radius of curvature of the image side of the ninth lens at the optical axis.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 0.95≤|F23 / F|≤20, and / or, -14≤R16 / F≤-0.5, and / or, 0.9 ≤ |F / F9| ≤ 2.1; Wherein, F23 is the combined focal length of the second lens and the third lens, F is the effective focal length of the optical lens, R16 is the radius of curvature of the image side of the eighth lens at the optical axis, and F9 is the focal length of the ninth lens.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 1.1≤CT1 / SAGS1≤2, and / or, 0.29≤CT3 / ET3≤0.75, and / or, 0.45≤CT9 / ET9≤1.5; Wherein, CT1 is the thickness of the first lens on the optical axis, SAGS1 is the sagitta of the edge of the effective optical diameter on the object side of the first lens, CT3 is the thickness of the third lens on the optical axis, ET3 is the distance from the maximum effective aperture on the object side of the third lens to the maximum effective aperture on the image side of the third lens along the optical axis, CT9 is the thickness of the ninth lens on the optical axis, and ET9 is the distance from the maximum effective aperture on the object side of the ninth lens to the maximum effective aperture on the image side of the ninth lens along the optical axis.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relationship: 1.55 ≤ SD1 / ImgH ≤ 1.95, and / or, 9.7 ≤ TTL / BFL ≤ 15.7, and / or 0.8 ≤ SD12 / SD13 ≤ 1.1; Wherein, SD1 is half of the maximum effective aperture of the object side of the first lens, ImgH is half of the image height corresponding to the maximum field of view of the optical lens, TTL is the total optical length of the optical lens, BFL is the back focal length of the optical lens, SD12 is half of the maximum effective aperture of the image side of the sixth lens, and SD13 is half of the maximum effective aperture of the object side of the seventh lens.

8. The optical lens according to any one of claims 1-7, characterized in that, The optical lens satisfies the following relationship: 7.7≤TTL / CT max ≤9.2, and / or, 4.6≤CT max / CT min ≤5.9; Where TTL is the total optical length of the optical lens, and CT is the total optical length of the optical lens. max CT is the maximum thickness of the first lens to the ninth lens along the optical axis. min It is the minimum thickness of the first lens to the ninth lens along the optical axis.

9. A camera module, characterized in that, The camera module includes a photosensitive chip and an optical lens according to any one of claims 1-8, wherein the photosensitive chip is disposed on the image side of the optical lens.

10. A terminal device, characterized in that, It includes a main body and the camera module as described in claim 9, wherein the camera module is disposed on the main body.

Images