Optical lens, camera module and terminal equipment

Abstract

The embodiment of the invention relates to the field of camera shooting, and provides an optical lens, a camera shooting module and terminal equipment. The optical lens has six lens elements with refractive power, from the object side to the image side: the first lens element with negative refractive power having a convex object-side surface and a concave image-side surface near the optical axis, respectively; the second lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The third lens has positive refractive power, and the object side surface and the image side surface of the third lens are respectively a concave surface and a convex surface near the optical axis; a fourth lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; a fifth lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; the sixth lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. The FOV and the FNO of the optical lens meet the following conditions: 170deg < = FOV < = 200deg, and 1 < = FNO < = 1.4. The optical lens provided by the invention can meet the requirements of a large field of view and high light flux.

Description

Technical Field

[0001] This application relates to the field of photography, and more particularly to an optical lens, a camera module, and a terminal device. Background Technology

[0002] As a perception component of autonomous driving systems, the performance requirements of automotive optical lenses are continuously upgrading with technological advancements. Currently, automotive optical lenses have limitations in field of view coverage and struggle to guarantee sufficient light transmission in low-light environments such as dusk and night, leading to decreased image quality. Therefore, developing optical lenses that combine a large field of view with high light transmission has become an urgent industry need. Summary of the Invention

[0003] This application provides an optical lens, a camera module, and a terminal device to meet the requirements of a large field of view and high light transmission, which is beneficial to improving the imaging quality of the optical lens.

[0004] In a first aspect, embodiments of this application provide an optical lens comprising six refractive lenses, arranged sequentially along the optical axis from the object side to the image side: a first lens having negative refractive power, wherein 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; a second lens having negative refractive power, wherein the image side of the second lens is concave near the optical axis; a third lens having positive refractive power, wherein the object side of the third lens is concave near the optical axis, and the image side of the third lens is convex near the optical axis; a fourth lens having positive refractive power, wherein the object side of the fourth lens is convex near the optical axis; a fifth lens having positive refractive power, wherein the object side of the fifth lens is convex near the optical axis; and a sixth lens having positive refractive power, wherein the object side of the sixth lens is convex near the optical axis, and the image side of the sixth lens is convex near the optical axis. The optical lens satisfies the following relationships: 170deg≤FOV≤200deg, 1≤FNO≤1.4. Wherein, FOV is the maximum field of view of the optical lens, and FNO is the aperture number of the optical lens.

[0005] In this embodiment, the first lens with negative refractive power, paired with a convex object-side surface near the optical axis and a concave image-side surface near the optical axis, can make the change in the angle of incident light rays more gradual, avoiding excessive aberrations caused by overly strong refraction changes. It also helps to increase the field of view of the optical lens and improve its relative illumination. The second lens with negative refractive power, paired with a concave image-side surface near the optical axis, can initially correct the astigmatism of the optical lens and effectively control the direction of light rays. The third lens with positive refractive power, paired with a concave object-side surface near the optical axis and a convex image-side surface near the optical axis, can smoothly guide the light rays diverging from the second lens into the fourth lens. The fourth lens with positive refractive power, paired with a convex object-side surface near the optical axis, helps to suppress the light rays, allowing more light to enter the image-side lens and improving the illumination of the optical lens. The fifth lens with positive refractive power, paired with a convex object-side surface near the optical axis, helps to further converge the light rays passing through the fourth lens, ensuring that the beam converges towards the image plane. The sixth lens, which has positive refractive power, is paired with the object-side and image-side surfaces that are convex near the optical axis. This allows the light rays from the object-side end of the sixth lens to be converged, so that the light rays are projected smoothly onto the imaging surface. This helps to balance the distortion produced by the front lens group, especially to correct barrel distortion.

[0006] In this embodiment, when the maximum field of view (FOV) of the optical lens satisfies the above-mentioned relationship, the optical lens can have a large field of view, which is beneficial for the optical lens to acquire subject information within a larger angle, thus meeting the requirement of a large field of view. When the aperture number (FNO) of the optical lens satisfies the above-mentioned relationship, the optical lens can have a large light transmission, which can improve the exposure efficiency of the optical lens in low-light conditions (such as dusk, night, etc.) while ensuring good resolution and improving the image quality of the optical lens. By controlling the maximum field of view (FOV) and aperture number (FNO) of the optical lens within the above-mentioned range, the optical lens can meet the requirement of a large field of view and also ensure sufficient light transmission under low-light conditions, thereby improving the image quality of the optical lens.

[0007] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 25≤TTL / F≤34, 16≤TTL / ImgH≤21, 10≤TTL / BFL≤14. Wherein, TTL is the total optical length of the optical lens, F is the effective focal length of the optical lens, ImgH is half the image height corresponding to the maximum field of view of the optical lens, and BFL is the back focal length of the optical lens.

[0008] In this implementation, limiting the ratio of the total optical length (TTL) to the effective focal length (F) of the optical lens to the range described above helps reduce optical lens aberrations and improves the system modulation transfer function (MTF), thereby achieving higher resolution and image sharpness. Limiting the ratio of the total optical length (TTL) to the half-image height (ImgH) to the range described above allows for a larger image plane and a more compact structure, thus satisfying both high pixel count and miniaturization requirements. Limiting the ratio of the total optical length (TTL) to the back focal length (BFL) to the range described above allows for increasing the back focal length while maintaining miniaturization, which is beneficial for lens assembly. Furthermore, increasing the back focal length helps reduce the energy of ghosting in the center reflections of the lens and filter.

[0009] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 10≤F3 / F≤55, 1.5≤F3 / CT3≤11, 1.5≤F6 / CT6≤2.5. Wherein, F3 is the focal length of the third lens, F is the effective focal length of the optical lens, CT3 is the thickness of the third lens along the optical axis, F6 is the focal length of the sixth lens, and CT6 is the thickness of the sixth lens along the optical axis.

[0010] In this implementation, by appropriately configuring the ratio of the focal length F3 of the third lens L3 to the effective focal length F of the optical lens, excessive spherical aberration introduced by the third lens L3 can be avoided, thus improving the resolving power of the optical lens. By appropriately configuring the ratio of the focal length F3 of the third lens to its thickness CT3 on the optical axis O, the light rays smoothly projected by the second lens are converged, thereby reducing the eccentricity sensitivity of the optical lens and improving its resolution. By appropriately configuring the ratio of the focal length F6 of the sixth lens to its thickness CT6 on the optical axis O, the light rays passing through the fifth lens are further converged, thereby reducing the eccentricity sensitivity of the optical lens and improving its resolution.

[0011] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 5≤R5 / R4≤ 1.5, 2≤R12 / F6≤ 0.5, 5≤R11 / R12≤ 0.5. Wherein, R5 is the radius of curvature of the object side of the third lens at the optical axis, R4 is the radius of curvature of the image side of the second lens at the optical axis, R12 is the radius of curvature of the image side of the sixth lens at the optical axis, F6 is the focal length of the sixth lens, and R11 is the radius of curvature of the object side of the sixth lens at the optical axis.

[0012] In this implementation, the focal length of the lens is directly related to the radii of curvature of its front and rear surfaces. Therefore, the ratio of R5 to R4 affects the curvature of the two adjacent optical surfaces—the object side of the third lens and the image side of the second lens—thus influencing the direction and angle of light deflection at the junction of the second and third lenses. By limiting R5 / R4 to the above range, the light deflection behavior at the junction of the second and third lenses can be made smoother, avoiding the introduction of excessive spherical aberration, coma, and astigmatism. By limiting F12 / R6 to the above range, the curvature of the sixth lens can be controlled, reducing the ghosting rate. Furthermore, the smaller radius of curvature of the image side of the sixth lens at the optical axis is beneficial for wide-angle imaging, suppressing strong beam divergence around the imaging area, suppressing the generation of higher-order aberrations, and improving image quality. By limiting the ratio of the radius of curvature of the object side and the image side of the sixth lens at the optical axis to the range mentioned above, the refractive power of the sixth lens of the optical lens can be uniformly configured, which is beneficial for correcting the distortions and aberrations generated by the first, second, third, fourth and fifth lenses, and improving the resolving power of the optical lens.

[0013] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 1.5 ≤ ∑CT / ∑AT ≤ 4, 1 ≤ CT3 / CT34 ≤ 9, 1 ≤ CT5 / CT6 ≤ 1.5. Wherein, ∑CT is the sum of the thicknesses of each lens along the optical axis, ∑AT is the sum of the air gaps between adjacent lenses from the first to the sixth lens, CT3 is the thickness of the third lens along the optical axis, CT34 is the distance along the optical axis from the image side of the third lens to the object side of the fourth 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.

[0014] In this implementation, by limiting ∑CT / ∑AT to the above range, the thickness and gap of the lens can be balanced, avoiding an excessively long total optical length (TTL) of the optical lens; furthermore, it is beneficial to improve the mechanical stability of the optical lens and reduce the sensitivity of system tolerances (such as eccentricity and tilt tolerances). By limiting the ratio of CT3 to CT34 to the above range, the thickness and gap of the third lens can be balanced, avoiding an excessively long total optical length (TTL) of the optical lens; furthermore, it is beneficial to improve the mechanical stability of the optical lens and reduce the sensitivity of system tolerances (such as eccentricity and tilt tolerances). By limiting the ratio of CT5 to CT6 to the above range, the total thickness of the fifth and sixth lenses can be reduced, which is beneficial for miniaturizing the optical lens design.

[0015] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 1≤SD1 / SD2≤1.75, 0.94≤SD4 / SD5≤1.1, 0.98≤SD10 / SD11≤1.15. Wherein, SD1 is half the maximum effective aperture of the object-side surface of the first lens, SD2 is half the maximum effective aperture of the image-side surface of the first lens, SD4 is half the maximum effective aperture of the image-side surface of the second lens, SD5 is half the maximum effective aperture of the object-side surface of the third lens, SD10 is half the maximum effective aperture of the image-side surface of the fifth lens, and SD11 is half the maximum effective aperture of the object-side surface of the sixth lens.

[0016] In this implementation, by limiting SD1 / SD2 to the above range, the incident angle of light in the first lens can be effectively controlled, which helps suppress aberrations at large field of view and reduces the burden on aberration correction of subsequent lenses. By limiting SD4 / SD5 to the above range, the apertures of the second and third lenses can be made closer, ensuring that light passing through the second lens enters the third lens efficiently; furthermore, it avoids a large difference in aperture between the second and third lenses, reducing the unused space of the optical lens and facilitating its miniaturization. By limiting SD10 / SD11 to the above range, the apertures of the fifth and sixth lenses can be made closer, ensuring that light passing through the fifth lens enters the sixth lens efficiently; furthermore, it avoids a large difference in aperture between the fifth and sixth lenses, reducing the unused space of the optical lens and facilitating its miniaturization.

[0017] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 2≤|SAGS4 / SAGS3|≤60, 3≤CT5 / SAGS9≤5.5, 1.2≤SAGS12 / SAGS11≤115. Wherein, SAGS4 is the sagitta of the edge of the effective optical diameter on the image-side of the second lens, SAGS3 is the sagitta of the edge of the effective optical diameter on the object-side of the second lens, CT5 is the thickness of the fifth lens along the optical axis, SAGS9 is the sagitta of the edge of the effective optical diameter on the object-side of the fifth lens, SAGS12 is the sagitta of the edge of the effective optical diameter on the image-side of the sixth lens, and SAGS11 is the sagitta of the edge of the effective optical diameter on the object-side of the sixth lens.

[0018] In this implementation, limiting |SAGS4 / SAGS3| to the above range helps control the curvature of the image-side and object-side surfaces of the second lens, thereby controlling the aperture of the second lens and facilitating its manufacturing. When |SAGS4 / SAGS3| is below the lower limit of the above relationship, the object-side surface of the second lens is excessively curved, which is detrimental to the surface shape control of the second lens and increases the risk of ghosting. When |SAGS4 / SAGS3| is above the upper limit of the above relationship, the image-side surface of the second lens is excessively curved, which is detrimental to the surface shape control of the second lens and increases the risk of ghosting. Similarly, controlling CT5 / SAGS9 to the above range helps control the curvature of the object-side surface of the fifth lens, thereby controlling the aperture of the fifth lens and facilitating its manufacturing. When the ratio of CT5 to SAGS9 is below the lower limit of the above relationship, the object-side surface of the fifth lens is excessively curved, which is detrimental to the surface shape control of the fifth lens and increases the risk of ghosting. When the ratio of CT5 to SAGS9 exceeds the upper limit of the above relationship, the fifth lens is too thick, which is detrimental to the miniaturization of the optical lens. By limiting SAGS12 / SAGS11 to the above range, it is beneficial to control the curvature of the image-side surface S12 and the object-side surface S11 of the sixth lens, thereby controlling the aperture of the sixth lens and facilitating its manufacturing. When SAGS12 / SAGS11 is below the lower limit of the above relationship, the object-side surface of the sixth lens is too curved, which is detrimental to the surface shape control of the sixth lens and increases the risk of ghosting; when SAGS12 / SAGS11 is above the upper limit of the above relationship, the image-side surface of the sixth lens is too curved, which is detrimental to the surface shape control of the sixth lens and increases the risk of ghosting.

[0019] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 1.5 ≤ ImgH / F ≤ 1.85, 108 deg / mm ≤ FOV / F ≤ 150 deg / mm, 120 deg ≤ FOV / FNO ≤ 185 deg. Where ImgH is half the image height corresponding to the maximum field of view of the optical lens, F is the effective focal length of the optical lens, FOV is the maximum field of view of the optical lens, and FNO is the aperture number of the optical lens.

[0020] In this implementation, by rationally configuring the ratio of the optical lens's half-image height (ImgH) to its effective focal length (F), the optical lens can achieve both a large depth of field and high image sharpness. It also helps to expand the optical lens's field of view, enabling wide-range shooting. By rationally configuring the ratio of the optical lens's FOV to its effective focal length (F), the optical lens can achieve a large field of view and a suitable focal length. By limiting the optical lens's FOV / FNO to the above range, a balance can be achieved between the optical lens's field of view and light transmission, optimizing depth of field, improving optical performance in low light, and reducing distortion.

[0021] 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 simultaneously meet the requirements of a large field of view and high light throughput, which is beneficial for improving the imaging quality of the optical lens.

[0022] 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 with the camera module can simultaneously meet the requirements of a large field of view and high light throughput, which is beneficial to improving imaging quality and ensuring a good user experience for the terminal device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a terminal device in one embodiment of this application; Figure 2 This is a schematic diagram of the camera module in the first embodiment; Figure 3 yes Figure 2 A schematic diagram of the optical lens structure in the diagram; Figure 4 yes Figure 3 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image; Figure 5 This is a schematic diagram of the optical lens in the second embodiment; Figure 6 yes Figure 5The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image; Figure 7 This is a schematic diagram of the optical lens in the third embodiment; Figure 8 yes Figure 7 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image; Figure 9 This is a schematic diagram of the optical lens in the fourth embodiment; Figure 10 yes Figure 9 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image; Figure 11 This is a schematic diagram of the optical lens in the fifth embodiment; Figure 12 yes Figure 11 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image; Figure 13 This is a schematic diagram of the optical lens in the sixth embodiment; Figure 14 yes Figure 13 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image; Figure 15 This is a schematic diagram of the optical lens in the seventh embodiment; Figure 16 yes Figure 15 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image; Figure 17 This is a schematic diagram of the optical lens in the eighth embodiment; Figure 18 yes Figure 17 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image; Figure 19 This is a schematic diagram of the optical lens in the ninth embodiment; Figure 20 yes Figure 19 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical lens in the image; Detailed Implementation For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be explained and described below.

[0024] Refractive power is a quantitative indicator of the ability of parallel light rays to converge or diverge after passing through a lens or optical lens; it is also called refractive power or optical power.

[0025] A lens or lens group with positive refractive power, having a positive focal length, and having the effect of converging light.

[0026] A lens or lens group with negative refractive power has a negative focal length and has the effect of diverging light.

[0027] Focal length, also known as focal length, is a measure of how well light converges or diverges in an optical lens. 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 prime lenses, the position of their optical center remains constant; for optical lenses, changes in the optical center result in changes in the focal length.

[0028] 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.

[0029] The image side is the side on which the image of the object is located, with the lens as the boundary. The surface of the lens closest to the image side is called the image side surface.

[0030] An aperture 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.

[0031] 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.

[0032] 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.

[0033] Back focal length (BFL) refers to the distance from the vertex of the last lens or optical element in an optical lens to the image plane; it is also called the back focal length.

[0034] 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.

[0035] 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.

[0036] Center thickness refers to the thickness of the lens along the optical axis at its optical center point.

[0037] Edge thickness refers to the thickness along the optical axis at the outermost edge of the lens.

[0038] 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 lens.

[0039] The sagittal (S) direction lies within the sagittal plane, which is the plane containing the principal ray and orthogonal to the meridional plane. The sagittal plane intersects the optical axis at the entrance pupil and is perpendicular to the meridional plane.

[0040] 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.

[0041] The focal point is the point where parallel light rays converge after being refracted by a lens or lens group.

[0042] 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.

[0043] 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.

[0044] 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 corresponding to the maximum field of view of the optical lens or half the image height of the imaging surface.

[0045] 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.

[0046] 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.

[0047] Aberrations are the properties of an ideal optical lens in the paraxial region, where 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 the lens rarely intersect perfectly at a single point, but rather deviate from the position of the paraxial image point. These differences are collectively referred to as aberrations.

[0048] Axial chromatic 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 happens 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.

[0049] 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. Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical lens 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 and the Gaussian image plane after passing through the lens in different fields of view 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.

[0050] 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.

[0051] 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.

[0052] Astigmatism occurs because the object point is not on the optical axis of the lens, causing the emitted beam of light to be tilted at an angle to the optical axis. After refraction by the lens, the convergence points of the meridional and sagittal beams are not at the same point. In other words, the beam cannot be focused at a single point, resulting in an unclear image and thus astigmatism. The meridional and sagittal beams are the names of the beams within two perpendicular planes of a rotationally symmetric optical lens.

[0053] 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 central 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.

[0054] Ghosting is the formation of a virtual image or light spot on the imaging plane after light is reflected or scattered multiple times between optical components such as lenses and sensors. It usually appears as a bright spot, halo, or colored stripe that is symmetrical or repeating with the original image, and is commonly seen in backlit shooting or scenes with strong light sources.

[0055] 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.

[0056] 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 lens, leading to asymmetric aberrations such as coma and astigmatism, which directly affect the imaging resolution.

[0057] Illuminance refers to the amount of visible light received per unit area, used to quantify the intensity of illumination on an object's surface.

[0058] The modulation transfer function (MTF) is a core quantitative indicator for evaluating the imaging quality of an optical imaging system. It objectively reflects the system's resolution and contrast characteristics by analyzing its ability to transmit information at different spatial frequencies.

[0059] This application provides a terminal device, which includes, but is not limited to, automobiles (including gasoline vehicles, electric vehicles, and hybrid vehicles), mobile phones, robot vacuum cleaners, tablet computers, 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.

[0060] like Figure 1As shown, in one embodiment, the terminal device 100 may be, for example, a car. The terminal device 100 may include a main body 10a and a camera module 200 disposed on the main body 10a. Components in the terminal device 100 other than the camera module 200 may be collectively referred to as the main body 10a.

[0061] like Figure 1 As shown, for example, the main body 10a may include a front end 101, a rear end 103, and rearview mirrors 102, etc. The camera module 200 may be a surround-view camera module, and there may be four camera modules 200, which may be located below the front end 101, the rear end 103, and the rearview mirrors 102 on both sides of the vehicle, respectively, to achieve 360° panoramic shooting outside the vehicle.

[0062] Understandable Figure 1 The structure, size, number, and position of the camera module 200 shown are merely illustrative and are not intended to limit this embodiment. For example, in another embodiment, there may be one, two, three, or more camera modules 200, and the position of the camera modules 200 can be determined according to product requirements.

[0063] like Figure 1 As shown, for example, the camera module 200 can be an infrared camera module. Infrared light has stronger penetrating power than visible light and is not dependent on ambient light, thus improving the imaging quality of the camera module 200 when the terminal device 100 is in a dark environment such as nighttime, fog, haze, rain, snow, or sandstorm. In another embodiment, the camera module 200 can also be a visible light camera module.

[0064] Understandable Figure 1 The terminal device 100 shown is only an illustrative example. In another embodiment, the terminal device 100 may also be an obstacle-avoiding smart device such as a robot vacuum cleaner, or an electronic device with shooting function such as a mobile phone, tablet computer, or camera.

[0065] 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 image light from the subject onto the surface of the photosensitive chip 201, and the photosensitive chip 201 is used to convert the optical image into an electrical signal.

[0066] Figure 3 for Figure 2 A structural schematic diagram of the optical lens 300. (Combined with...) Figure 2 and Figure 3As shown, the optical lens 300 has six 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, and lens L6. During imaging, light rays enter the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 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 sixth lens L6.

[0067] like Figure 3 As shown, the first lens L1 has negative 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. Here, near the optical axis O refers to the area on a lens surface immediately adjacent to the optical axis O. This configuration allows for a more gradual change in the angle of refraction of incident light, preventing excessive aberrations caused by overly strong refraction changes. It also helps to increase the field of view of the optical lens 300 and improve its relative illumination.

[0068] like Figure 3 As shown, the second lens L2 has negative refractive power, and the image-side surface S4 of the second lens L2 is concave near the optical axis. With this configuration, the astigmatism of the optical lens 300 can be initially corrected, while effectively controlling the direction of light.

[0069] like Figure 3 As shown, the third lens L3 has positive refractive power. 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 convex near the optical axis O. With the above arrangement, the light rays diverged by the second lens L2 can smoothly enter the fourth lens L4.

[0070] like Figure 3 As shown, the fourth lens L4 has positive refractive power, and the object-side surface S7 of the fourth lens L4 is convex near the optical axis O. This configuration helps to suppress light rays, allowing more light to enter the image-side lens and improving the illumination of the optical lens 300.

[0071] like Figure 3 As shown, the fifth lens L5 has positive refractive power, and the object-side surface S9 of the fifth lens L5 is convex near the optical axis O. This configuration helps to further converge the light rays passing through the fourth lens L4, ensuring that the beam converges towards the image plane.

[0072] like Figure 3As shown, the sixth lens L6 can have positive refractive power, and both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are convex near the optical axis O. With this configuration, the light rays from the object-side end of the sixth lens L6 can be converged, allowing the light to be smoothly projected onto the imaging plane IMG, which helps to balance the distortion produced by the front lens group, especially correcting barrel distortion.

[0073] refer to Figure 1 and Figure 3 As shown, when the optical lens 300 is applied to terminal devices such as automobiles, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 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 meet low-temperature requirements. Clear imaging at 40 °C and high temperatures of 105 °C. In another embodiment, among the multiple lenses of the optical lens 300, some lenses may be made of glass and some lenses may be made of plastic, thereby ensuring that while reducing the impact of temperature on the lenses to achieve better image quality, the manufacturing cost and weight of the optical lens 300 can also be reduced.

[0074] refer to Figure 3 As shown, when the optical lens 300 is applied to terminal devices such as mobile phones and tablets, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 can be plastic to reduce the overall weight of the optical lens 300.

[0075] refer to Figure 3As shown, in one embodiment, the sixth lens L6 can be an aspherical lens, while the first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5 can all be spherical lenses. Spherical lenses are characterized by simple manufacturing processes and low production costs. Aspherical lenses allow for more flexible designs on the object-side or image-side of the lens, enabling the lens to effectively address issues such as unclear imaging, distorted field of view, or narrow field of view even with a smaller and thinner size, thus shortening the length of the optical lens 300. Through a combination of spherical and aspherical lenses, not only is the manufacturability of each lens improved, facilitating surface design, but the object-side or image-side of the lens also allows for more flexible designs. This enables each lens to effectively address issues such as unclear imaging, distorted field of view, or narrow field of view even with a smaller and thinner size, and the optical lens 300 can achieve good image quality without requiring an excessive number of lenses, further shortening the length of the optical lens 300. It is understood that, in another embodiment, the surfaces of each lens in the optical lens 300 can be spherical, aspherical, or any combination of spherical and aspherical surfaces, and can be selected according to actual needs. Therefore, no specific limitation is made in this embodiment.

[0076] 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 any two lenses, or on the object side of the first lens L1; this embodiment does not limit this.

[0077] like Figure 3As shown, in one embodiment, the optical lens 300 may further include an infrared filter (IR), which may be disposed between the sixth lens L6 and the imaging surface IMG of the optical lens 300. For example, the IR filter may be an infrared bandpass filter, allowing infrared light to pass through and reflecting visible light to achieve 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. In another embodiment, the IR filter may be an infrared cutoff filter, filtering out infrared light and allowing visible light to pass through, making the image more consistent with the visual experience of the human eye, thereby improving 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.

[0078] 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.

[0079] In this embodiment, the maximum field of view (FOV) of the optical lens 300 satisfies the relationship: 170deg≤FOV≤200deg. When the optical lens 300 satisfies the above relationship, the optical lens 300 can have a large field of view, which is beneficial for the optical lens 300 to acquire subject information within a larger angle, thus enabling the optical lens 300 to meet the requirement of a large field of view. In this embodiment, the aperture number FNO of the optical lens 300 satisfies the relationship: 1≤FNO≤1.4. When the optical lens 300 satisfies the above relationship, the optical lens 300 can have a large light transmission capacity, which can improve the exposure efficiency of the optical lens 300 under low light conditions (such as dusk, night, etc.) while ensuring good resolution and improving the imaging quality of the optical lens 300.

[0080] In this embodiment of the application, by controlling the maximum field of view (FOV) and aperture number (FNO) of the optical lens 300 within the above range, the optical lens 300 can meet the requirements of a large field of view and ensure sufficient light transmission under low light conditions, thereby improving the imaging quality of the optical lens 300.

[0081] In some embodiments, the total optical length (TTL) and effective focal length (F) of the optical lens 300 can satisfy the relationship: 25 ≤ TTL / F ≤ 34. 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, it is beneficial to reduce the aberrations of the optical lens 300 and to improve the system modulation transfer function (MTF), thereby achieving higher resolution and image sharpness of the optical lens 300.

[0082] In some embodiments, the total optical length (TTL) and half-image height (ImgH) of the optical lens 300 can satisfy the relationship: 16 ≤ TTL / ImgH ≤ 21. By limiting the ratio of the total optical length (TTL) and half-image height (ImgH) of the optical lens 300 to the above range, the image plane of the optical lens 300 can be made larger and the structure more compact, thereby enabling the optical lens 300 to meet both the requirements of high pixel count and miniaturization.

[0083] In some embodiments, the total optical length (TTL) and back focal length (BFL) of the optical lens 300 can satisfy the relationship: 10 ≤ TTL / BFL ≤ 14. By limiting the ratio of the total optical length (TTL) to the back focal length (BFL) of the optical lens 300 to the above range, the back focal length of the optical lens 300 can be increased while achieving miniaturization, which is beneficial for the assembly of the optical lens 300; furthermore, increasing the back focal length helps to reduce the energy of ghosting in the center reflections of the lens and filter.

[0084] 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: 10 ≤ F3 / F ≤ 55. When the optical lens 300 satisfies the above relationship, by reasonably configuring the ratio of the focal length F3 of the third lens L3 to the effective focal length F of the optical lens 300, excessive spherical aberration introduced by the third lens L3 can be avoided, thereby improving the resolving power of the optical lens 300.

[0085] In some embodiments, the focal length F3 of the third lens L3 and the thickness CT3 of the third lens L3 on the optical axis O can satisfy the relationship: 1.5 ≤ F3 / CT3 ≤ 11. When the optical lens 300 satisfies the above relationship, by reasonably configuring the ratio of the focal length F3 of the third lens L3 to the thickness CT3 of the third lens L3 on the optical axis O, the light rays smoothly projected by the second lens L2 are converged, thereby reducing the eccentricity sensitivity of the optical lens 300 and improving the resolution of the optical lens 300.

[0086] In some embodiments, the focal length F6 of the sixth lens L6 and its thickness CT6 on the optical axis O can satisfy the relationship: 1.5 ≤ F6 / CT6 ≤ 2.5. When the optical lens 300 satisfies the above relationship, by reasonably configuring the ratio of the focal length F6 of the sixth lens L6 to its thickness CT6 on the optical axis O, the light rays passing through the fifth lens L5 are further converged, thereby reducing the eccentricity sensitivity of the optical lens 300 and improving its resolution.

[0087] In some embodiments, the radius of curvature R5 of the object-side surface S5 of the third lens L3 at the optical axis O and the radius of curvature R4 of the image-side surface S4 of the second lens L2 at the optical axis O can satisfy the following relationship: 5≤R5 / R4≤ 1.5. The focal length of a lens is directly related to the radii of curvature of its front and rear surfaces. Therefore, the ratio of R5 to R4 affects the curvature of the object-side surface S5 of the third lens L3 and the image-side surface S4 of the second lens L2, which in turn affects the direction and angle of light deflection at the junction of the second lens L2 and the third lens L3. By limiting R5 / R4 to the range described above, the deflection behavior of light at the junction of the second and third lenses can be made smoother, avoiding the introduction of excessive spherical aberration, coma, and astigmatism.

[0088] In some embodiments, the radius of curvature R12 of the image-side surface S12 of the sixth lens L6 at the optical axis O and the focal length F6 of the sixth lens L6 can satisfy the following relationship: 2≤R12 / F6≤ 0.5. By limiting F12 / R6 to the above range, the curvature of the sixth lens L6 can be controlled, reducing the ghosting rate; and the smaller radius of curvature of the image side S4 of the sixth lens L6 at the optical axis O is beneficial for wide-angle imaging, suppressing the strong divergence of the beam around the imaging area, suppressing the generation of higher-order aberrations, and improving image quality.

[0089] In some embodiments, the radius of curvature R11 of the object side surface S11 of the sixth lens L6 at the optical axis O and the radius of curvature R12 of the image side surface S12 of the sixth lens L6 at the optical axis O can satisfy the following relationship: 5≤R11 / R12≤ 0.5. By limiting the ratio of the radius of curvature of the object side surface S11 and the image side surface S12 of the sixth lens L6 at the optical axis O 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 correcting the distortion and aberrations generated by the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5, and improving the resolving power of the optical lens 300.

[0090] In some embodiments, the sum of the thicknesses ∑CT of each lens of the optical lens 300 along the optical axis O, and the sum of the air gaps between adjacent lenses from the first to the sixth lens, ∑AT, can satisfy the relationship: 1.5 ≤ ∑CT / ∑AT ≤ 4. By limiting ∑CT / ∑AT to the above range, the thickness and gaps of the lenses can be balanced, avoiding an excessively long total optical length (TTL) of the optical lens 300; furthermore, it is beneficial to improve the mechanical stability of the optical lens 300 and reduce the sensitivity of system tolerances (e.g., eccentricity tolerance and tilt tolerance).

[0091] In some embodiments, the thickness CT3 of the third lens L3 on the optical axis O, and the distance from the image side S6 of the third lens L3 to the object side S7 of the fourth lens L4 on the optical axis O, can satisfy the relationship: 1≤CT3 / CT34≤9. By limiting the ratio of CT3 to CT34 to the above range, the thickness and gap of the third lens L3 can be balanced, avoiding an excessively long total optical length (TTL) of the optical lens 300; furthermore, it is beneficial to improve the mechanical stability of the optical lens 300 and reduce the sensitivity of system tolerances (such as eccentricity tolerance and tilt tolerance).

[0092] 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: 1≤CT5 / CT6≤1.5. By limiting the ratio of CT5 and 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 miniaturizing the optical lens 300.

[0093] In some embodiments, half the maximum effective aperture SD1 of the object-side surface S1 of the first lens L1 and half the maximum effective aperture SD2 of the image-side surface S2 of the first lens L1 can satisfy the relationship: 1 ≤ SD1 / SD2 ≤ 1.75. By limiting SD1 / SD2 to the above range, the incident angle of light on the first lens L1 can be effectively controlled, which is beneficial to suppressing aberrations at large field of view and reducing the burden of aberration correction for subsequent lenses.

[0094] In some embodiments, half of the maximum effective aperture SD4 of the image-side surface S4 of the second lens L2 and half of the maximum effective aperture SD5 of the object-side surface S5 of the third lens L3 can satisfy the relationship: 0.94≤SD4 / SD5≤1.1. With this arrangement, the apertures of the second lens L2 and the third lens L3 can be made relatively close, ensuring that light passing through the second lens L2 efficiently enters the third lens L3; furthermore, it avoids excessive difference in aperture between the second lens L2 and the third lens L3, reducing the unused space of the optical lens 300 and facilitating its miniaturization.

[0095] In some embodiments, half the maximum effective aperture SD10 of the image-side surface S10 of the fifth lens L5 and half the maximum effective aperture SD11 of the object-side surface S11 of the sixth lens L6 can satisfy the relationship: 0.98≤SD10 / SD11≤1.15. With this configuration, the apertures of the fifth lens L5 and the sixth lens L6 can be made relatively close, ensuring that light passing through the fifth lens L5 efficiently enters the sixth lens L6; furthermore, it avoids excessive differences in aperture between the fifth lens L5 and the sixth lens L6, reducing the unused space of the optical lens 300 and facilitating its miniaturization.

[0096] In some embodiments, the sagitta of the effective optical diameter edge SAGS4 of the image-side surface S4 of the second lens L2 and the sagitta of the effective optical diameter edge SAGS3 of the object-side surface S3 of the second lens L2 can satisfy the relationship: 2≤|SAGS4 / SAGS3|≤60. By limiting |SAGS4 / SAGS3| to the above range, it is beneficial to control the curvature of the image-side surface S4 and the object-side surface S3 of the second lens L2, thereby controlling the aperture of the second lens L2 and facilitating the manufacturing of the second lens L2. When |SAGS4 / SAGS3| is lower than the lower limit of the above relationship, the object-side surface S3 of the second lens L2 is too curved, which is not conducive to the surface shape control of the second lens L2 and increases the risk of ghosting; when |SAGS4 / SAGS3| is higher than the upper limit of the above relationship, the image-side surface S4 of the second lens L2 is too curved, which is not conducive to the surface shape control of the second lens L2 and increases the risk of ghosting.

[0097] In some embodiments, the thickness CT5 of the fifth lens L5 on the optical axis O and the sagitta SAGS9 of the effective optical diameter edge of the object-side surface S9 of the fifth lens L5 can satisfy the relationship: 3≤CT5 / SAGS9≤5.5. By controlling CT5 / SAGS9 within the above range, it is beneficial to control the curvature of the object-side surface S9 of the fifth lens L5, thereby controlling the aperture of the fifth lens L5 and facilitating the manufacturing of the fifth lens L5. When the ratio of CT5 to SAGS9 is lower than the lower limit of the above relationship, the object-side surface S9 of the fifth lens L5 is too curved, which is not conducive to the surface shape control of the fifth lens L5 and increases the risk of ghosting; when the ratio of CT5 to SAGS9 exceeds the upper limit of the above relationship, the fifth lens L5 is too thick, which is not conducive to the miniaturization of the optical lens 300.

[0098] In some embodiments, the sagitta of the effective optical diameter edge SAGS12 of the image-side surface S12 of the sixth lens L6 and the sagitta of the effective optical diameter edge SAGS11 of the object-side surface S11 of the sixth lens L6 can satisfy the relationship: 1.2 ≤ SAGS12 / SAGS11 ≤ 115. By limiting SAGS12 / SAGS11 to the above range, it is beneficial to control the curvature of the image-side surface S12 and the object-side surface S11 of the sixth lens L6, thereby controlling the aperture of the sixth lens L6 and facilitating the manufacturing of the sixth lens L6. When SAGS12 / SAGS11 is lower than the lower limit of the above relationship, the object-side surface S11 of the sixth lens L6 is too curved, which is not conducive to the surface shape control of the sixth lens L6 and increases the risk of ghosting; when SAGS12 / SAGS11 is higher than the upper limit of the above relationship, the image-side surface S12 of the sixth lens L6 is too curved, which is not conducive to the surface shape control of the sixth lens L6 and increases the risk of ghosting.

[0099] In some embodiments, the ratio of half the image height ImgH corresponding to the maximum field of view of the optical lens 300 to the effective focal length F can satisfy the following relationship: 1.5 ≤ ImgH / F ≤ 1.85. When the optical lens 300 satisfies the above relationship, the ratio of the half image height ImgH to the effective focal length F of the optical lens 300 can be reasonably configured, which is beneficial for the optical lens 300 to meet the requirements of high image sharpness while having a large depth of field; at the same time, it is also beneficial to expand the field of view of the optical lens 300 and realize wide-range shooting.

[0100] In some embodiments, the maximum field of view (FOV) and effective focal length (F) of the optical lens 300 can satisfy the relationship: 108deg / mm ≤ FOV / F ≤ 150deg / mm. When the optical lens 300 satisfies the above relationship, the ratio of FOV to effective focal length (F) of the optical lens 300 can be reasonably configured, which is beneficial for the optical lens 300 to have a larger field of view and a suitable focal length.

[0101] In some embodiments, the maximum field of view (FOV) of the optical lens 300 and the aperture number (FNO) can satisfy the relationship: 120deg ≤ FOV / FNO ≤ 185deg. By limiting the FOV / FNO of the optical lens 300 to the above range, the optical lens 300 can achieve a balance between field of view and light transmission, optimize depth of field, improve optical performance in low light, and reduce distortion.

[0102] 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 following relationship: 10≤F1 / F≤ 5. When the optical lens 300 satisfies the above relationship, by reasonably configuring the ratio of the focal length F1 of the first lens L1 to the effective focal length F of the optical lens 300, excessive spherical aberration introduced by the first lens L1 can be avoided and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0103] 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 following relationship: 5≤F2 / F≤ 3. When the optical lens 300 satisfies the above relationship, by reasonably configuring the ratio of the focal length F2 of the second lens L2 to the effective focal length F of the optical lens 300, excessive spherical aberration introduced by the second lens L2 can be avoided and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0104] 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: 14 ≤ F4 / F ≤ 120. When the optical lens 300 satisfies the above relationship, by reasonably configuring the ratio of the focal length F4 of the fourth lens L4 to the effective focal length F of the optical lens 300, 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.

[0105] 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: 9 ≤ F5 / F ≤ 12. When the optical lens 300 satisfies the above relationship, by reasonably configuring the ratio of the focal length F5 of the fifth lens L5 to the effective focal length F of the optical lens 300, excessive spherical aberration introduced by the fifth lens L5 can be avoided and aberrations can be effectively corrected, thereby improving the resolving power of the optical lens 300.

[0106] 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: 5.5 ≤ F6 / F ≤ 7. When the optical lens 300 satisfies the above relationship, by reasonably configuring the ratio of the focal length F6 of the sixth lens L6 to the effective focal length F of the optical lens 300, 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.

[0107] In some embodiments, the radius of curvature R1 of the object-side surface S1 of the first lens L1 at the optical axis O and the radius of curvature R2 of the image-side surface S2 of the first lens L1 at the optical axis O can satisfy the relationship: 1.8 ≤ R1 / R2 ≤ 3. By setting it as described above, the shapes of the object-side surface S1 and the image-side surface S2 of the first lens L1 can be reasonably restricted, which is beneficial for controlling the light path and reducing the off-axis aberrations of the optical lens 300.

[0108] In some embodiments, the radius of curvature R3 of the object-side surface S3 of the second lens L2 at the optical axis O and the radius of curvature R4 of the image-side surface S4 of the second lens L2 at the optical axis O can satisfy the relationship: 3≤|R3 / R4|≤85. By setting it as described above, the shapes of the object-side surface S3 and the image-side surface S4 of the second lens L2 can be reasonably restricted, which is beneficial for controlling the light path and reducing the off-axis aberrations of the optical lens 300.

[0109] In some embodiments, the radius of curvature R5 of the object-side surface S5 of the third lens L3 at the optical axis O and the radius of curvature R6 of the image-side surface S6 of the third lens L3 at the optical axis O can satisfy the relationship: 0.9≤R5 / R6≤2. By setting it as described above, the shapes of the object-side surface S5 and the image-side surface S6 of the third lens L3 can be reasonably limited, which is beneficial for controlling the light path and reducing the off-axis aberrations of the optical lens 300.

[0110] In some embodiments, the radius of curvature R8 of the image-side surface S8 of the fourth lens L4 at the optical axis O and the radius of curvature R7 of the object-side surface S7 of the fourth lens L4 at the optical axis O can satisfy the relationship: 1.5 ≤ R8 / R7 ≤ 22. By setting it as described above, the shapes of the object-side surface S7 and the image-side surface S8 of the fourth lens L4 can be reasonably limited, which is beneficial for controlling the light path and reducing the off-axis aberrations of the optical lens 300.

[0111] In some embodiments, the radius of curvature R10 of the image-side surface S10 of the fifth lens L5 at the optical axis O and the radius of curvature R9 of the object-side surface S9 of the fifth lens L5 at the optical axis O can satisfy the relationship: 3≤R10 / R9≤45. By setting it as described above, the shapes of the object-side surface S9 and the image-side surface S10 of the fifth lens L5 can be reasonably limited, which is beneficial for controlling the light path and reducing the off-axis aberrations of the optical lens 300.

[0112] The optical lens 300 of this embodiment will be described in detail below with reference to specific parameters.

[0113] First Embodiment 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 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 negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has positive refractive power.

[0114] like Figure 3 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 concave near the optical axis O, and the image-side surface S6 of the third lens L3 is convex near the optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex near the optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex near the optical axis O; and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both convex near the optical axis O.

[0115] In Table 1a, the Y-radius refers to the radius of curvature of the object-side or image-side surface at the optical axis O for the corresponding surface number. 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 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 refers to 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 1a are all mm, and the reference wavelength for the refractive index, Abbe number, and focal length of each lens in Table 1a is 920 nm.

[0116] The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0117] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, c is the curvature of the vertex of the aspherical surface, c = 1 / Y, Y is the radius of curvature (i.e., the paraxial curvature c is the reciprocal of the radius of Y in Table 1a), r is the distance from any point on the aspherical surface to the optical axis O, k is the conic constant, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula.

[0118] In the first embodiment, the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both aspherical surfaces. Table 1b gives the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical surface in the first embodiment.

[0119] Table 1a: Partial parameters of the optical lens in the first embodiment.

[0120] Table 1b shows the surface profile parameters of each aspherical surface of the optical lens in the first embodiment.

[0121] 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 960 nm, 940 nm, and 920 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.

[0122] Figure 4 Figure (B) illustrates the astigmatism curve of the optical lens 300 in the first embodiment at a wavelength of 940 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.

[0123] Figure 4 Figure (C) illustrates the distortion curve of the optical lens 300 in the first embodiment at a wavelength of 940 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.

[0124] Second Embodiment like Figure 5As shown, in the second 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 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 negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has positive refractive power.

[0125] like Figure 5 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 concave near the optical axis O, and the image-side surface S6 of the third lens L3 is convex near the optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex near the optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex near the optical axis O; and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both convex near the optical axis O.

[0126] Table 2a shows some parameters of the optical lens 300 in the second embodiment. The meaning of each parameter is referred to in Table 1a, and will not be repeated here.

[0127] In the second embodiment, both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are aspherical surfaces. Table 2b lists the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in the second embodiment. The surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0128] Table 2a: Partial parameters of the optical lens in the second embodiment.

[0129] Table 2b shows the surface profile parameters of each aspherical surface of the optical lens in the second embodiment.

[0130] 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 6The 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.

[0131] Third Embodiment like Figure 7 As 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 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 negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has positive refractive power.

[0132] like Figure 7 As shown, in the third embodiment, 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 concave near the optical axis O, and the image-side surface S6 of the third lens L3 is convex near the optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex near the optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex near the optical axis O; and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both convex near the optical axis O.

[0133] Table 3a shows some parameters of the optical lens 300 in the third embodiment. The meaning of each parameter is referred to in Table 1a, and will not be repeated here.

[0134] In the third embodiment, both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are aspherical surfaces. Table 3b lists the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in the third embodiment. The surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0135] Table 3a: Partial parameters of the optical lens in the third embodiment.

[0136] Table 3b shows the surface profile parameters of each aspherical surface of the optical lens in the third embodiment.

[0137] Please see Figure 8 ,from Figure 8 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 all well controlled, thus the optical lens 300 of the third embodiment has good imaging quality. Furthermore, regarding... Figure 8 (A) Figure 8 (B) and Figure 8 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.

[0138] Fourth embodiment 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 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 negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has positive refractive power.

[0139] like Figure 9 As shown, in the fourth embodiment, 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 concave near the optical axis O, and the image-side surface S6 of the third lens L3 is convex near the optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex near the optical axis O; the object-side surface S9 of the fifth lens L5 is convex near the optical axis O, and the image-side surface S10 of the fifth lens L5 is concave near the optical axis O; the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both convex near the optical axis O.

[0140] Table 4a shows some parameters of the optical lens 300 in the fourth embodiment. The meaning of each parameter is referred to in Table 1a, and will not be repeated here.

[0141] In the fourth embodiment, both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are aspherical surfaces. Table 4b lists the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in the fourth embodiment. The surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0142] Table 4a. Partial parameters of the optical lens in the fourth embodiment.

[0143] Table 4b: Surface shape parameters of each aspherical surface of the optical lens in the fourth embodiment.

[0144] 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 10 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.

[0145] Fifth Embodiment like Figure 11 As 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 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 negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has positive refractive power.

[0146] like Figure 10 As shown, in the fifth embodiment, 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 and the image-side surface S4 of the second lens L2 are both concave 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 convex near the optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex near the optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex near the optical axis O; and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both convex near the optical axis O.

[0147] Table 5a shows some parameters of the optical lens 300 in the fifth embodiment. The meaning of each parameter is referred to in Table 1a, and will not be repeated here.

[0148] In the fifth embodiment, both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are aspherical surfaces. Table 5b lists the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in the fifth embodiment. The surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0149] Table 5a Partial parameters of the optical lens in the fifth embodiment

[0150] Table 5b: Surface shape parameters of each aspherical surface of the optical lens in the fifth embodiment.

[0151] Please see Figure 12 ,from Figure 12 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 fifth embodiment has good imaging quality. Furthermore, regarding... Figure 12 (A) Figure 10 (B) and Figure 10 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.

[0152] Sixth Embodiment 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 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 negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has positive refractive power.

[0153] like Figure 13As shown, in the sixth embodiment, 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 concave near the optical axis O, and the image-side surface S6 of the third lens L3 is convex near the optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex near the optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex near the optical axis O; and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both convex near the optical axis O.

[0154] Table 6a shows some parameters of the optical lens 300 in the sixth embodiment. The meaning of each parameter is referred to in Table 1a, and will not be repeated here.

[0155] In the sixth embodiment, both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are aspherical surfaces. Table 6b lists the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in the sixth embodiment. The surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0156] Table 6a. Partial parameters of the optical lens in the sixth embodiment.

[0157] Table 6b: Surface shape parameters of each aspherical surface of the optical lens in the sixth embodiment.

[0158] Please see Figure 14 ,from Figure 14 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 all well controlled, thus the optical lens 300 of the sixth embodiment has good imaging quality. Furthermore, regarding... Figure 14 (A) Figure 14 (B) and Figure 14 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.

[0159] Seventh Embodiment like Figure 15As 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 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 negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has positive refractive power.

[0160] like Figure 15 As shown, in the seventh embodiment, 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 concave near the optical axis O, and the image-side surface S6 of the third lens L3 is convex near the optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex near the optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex near the optical axis O; and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both convex near the optical axis O.

[0161] Table 7a shows some parameters of the optical lens 300 in the seventh embodiment. The meaning of each parameter is referred to in Table 1a, and will not be repeated here.

[0162] In the seventh embodiment, both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are aspherical surfaces. Table 7b lists the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in the seventh embodiment. The surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0163] Table 7a Partial parameters of the optical lens in the seventh embodiment

[0164] Table 7b: Surface shape parameters of each aspherical surface of the optical lens in the seventh embodiment.

[0165] Please see Figure 16 ,from Figure 16 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 all well controlled, thus the optical lens 300 of the seventh embodiment has good imaging quality. Furthermore, regarding... Figure 16 (A) Figure 16 (B) and Figure 16 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.

[0166] Eighth embodiment like Figure 17 As shown, in the eighth 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 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 negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has positive refractive power.

[0167] like Figure 17 As shown, in the eighth embodiment, 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 concave near the optical axis O, and the image-side surface S6 of the third lens L3 is convex near the optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex near the optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex near the optical axis O; and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both convex near the optical axis O.

[0168] Table 8a shows some parameters of the optical lens 300 in the eighth embodiment. The meaning of each parameter is referred to in Table 1a, and will not be repeated here.

[0169] In the eighth embodiment, both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are aspherical. Table 8b lists the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in the eighth embodiment. The surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0170] Table 8a Partial parameters of the optical lens in the eighth embodiment

[0171] Table 8b: Surface shape parameters of each aspherical surface of the optical lens in the eighth embodiment.

[0172] Please see Figure 18 ,from Figure 18 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 all well controlled, thus the optical lens 300 of the eighth embodiment has good imaging quality. Furthermore, regarding... Figure 18 (A) Figure 18 (B) and Figure 18 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.

[0173] Ninth Embodiment like Figure 19 As shown, in the ninth 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 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 negative refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has positive refractive power.

[0174] like Figure 19 As shown, in the ninth embodiment, 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 concave near the optical axis O, and the image-side surface S6 of the third lens L3 is convex 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 and the image-side surface S10 of the fifth lens L5 are both convex near the optical axis O; and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both convex near the optical axis O.

[0175] Table 9a shows some parameters of the optical lens 300 in the ninth embodiment. The meaning of each parameter is referred to in Table 1a, and will not be repeated here.

[0176] In the ninth embodiment, both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are aspherical. Table 9b lists the conic constant k and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in the ninth embodiment. The surface shape of each aspherical surface can be defined by the formula given in the first embodiment.

[0177] Table 9a: Partial parameters of the optical lens in the ninth embodiment

[0178] Table 9b: Surface shape parameters of each aspherical surface of the optical lens in the ninth embodiment.

[0179] Please see Figure 20 ,from Figure 20 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 ninth embodiment has good imaging quality. Furthermore, regarding... Figure 20 (A) Figure 20 (B) and Figure 20 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.

[0180] Table 10 illustrates the values ​​of FOV, FNO, TTL / F, TTL / ImgH, TTL / BFL, F3 / F, F3 / CT3, F6 / CT6, R5 / R4, R12 / F6, R11 / R12, ∑CT / ∑AT, CT3 / CT34, CT5 / CT6, SD1 / SD2, SD4 / SD5, SD10 / SD11, |SAGS4 / SAGS3|, CT5 / SAGS9, SAGS12 / SAGS11, ImgH / F, FOV / F, FOV / FNO, F1 / F, F2 / F, F4 / F, F5 / F, F6 / F, R1 / R2, |R3 / R4|, R5 / R6, R8 / R7, and R10 / R9 in the optical lenses 300 of the first to ninth embodiments. These values ​​all satisfy the relationships described above.

[0181] Table 10. Partial parameters of the optical lenses in the first to ninth embodiments.

[0182] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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 six lenses with refractive power, comprising in order from the object side to the image side along the optical axis: a first lens with negative refractive power, the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis; a second lens with negative refractive power, the image side surface of the second lens is concave at the near optical axis; a third lens with positive refractive power, the object side surface of the third lens is concave at the near optical axis, and the image side surface of the third lens is convex at the near optical axis; a fourth lens with positive refractive power, the object side surface of the fourth lens is convex at the near optical axis; a fifth lens with positive refractive power, the object side surface of the fifth lens is convex at the near optical axis; a sixth lens with positive refractive power, the object side surface of the sixth lens is convex at the near optical axis, and the image side surface of the sixth lens is convex at the near optical axis; the optical lens satisfies the following relationship: 170deg ≤ FOV ≤ 200deg, 1 ≤ FNO ≤ 1.4; wherein FOV is the maximum field of view angle of the optical lens, and FNO is the aperture number of the optical lens.

2. The optical lens according to claim 1, characterized in that, the optical lens satisfies the following relationship: 25 ≤ TTL / F ≤ 34, and / or, 16 ≤ TTL / ImgH ≤ 21, and / or, 10 ≤ TTL / BFL ≤ 14; 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 image height corresponding to the maximum field of view angle of the optical lens, and BFL is the back focal length of the optical lens.

3. The optical lens according to claim 1, characterized in that, the optical lens satisfies the following relationship: 10 ≤ F3 / F ≤ 55, and / or, 1.5 ≤ F3 / CT3 ≤ 11, and / or, 1.5 ≤ F6 / CT6 ≤ 2.5; wherein F3 is the focal length of the third lens, F is the effective focal length of the optical lens, CT3 is the thickness of the third lens on the optical axis, F6 is the focal length of the sixth lens, 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: 5 < R5 / R4 < 7 1.5, and / or, 2 < R12 / F6 < 4 0.5, and / or, 5 < R11 / R12 < 7 0.5; wherein R5 is the radius of curvature of the object side surface of the third lens at the optical axis, R4 is the radius of curvature of the image side surface of the second lens at the optical axis, R12 is the radius of curvature of the image side surface of the sixth lens at the optical axis, F6 is the focal length of the sixth lens, and R11 is the radius of curvature of the object side surface of the sixth lens at the optical axis.

5. The optical lens according to claim 1, characterized in that, the optical lens satisfies the following relationship: 1.5 ≤ ∑CT / ∑AT ≤ 4, and / or, 1 ≤ CT3 / CT34 ≤ 9, and / or, 1 ≤ CT5 / CT6 ≤ 1.5; Wherein, ∑CT is the sum of thickness of each lens on the optical axis, ∑AT is the sum of air gap between adjacent two lenses of the first lens to the sixth lens, CT3 is the thickness of the third lens on the optical axis, CT34 is the distance from the image side surface of the third lens to the object side surface of the fourth lens on the optical axis, 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.

6. The optical lens according to claim 1, wherein the optical lens satisfies the following relationship: 1≤SD1 / SD2≤1.75, and / or, 0.94≤SD4 / SD5≤1.1, and / or, 0.98≤SD10 / SD11≤1.15; wherein, SD1 is half of the maximum effective aperture of the object side surface of the first lens, SD2 is half of the maximum effective aperture of the image side surface of the first lens, SD4 is half of the maximum effective aperture of the image side surface of the second lens, SD5 is half of the maximum effective aperture of the object side surface of the third lens, SD10 is half of the maximum effective aperture of the image side surface of the fifth lens, and SD11 is half of the maximum effective aperture of the object side surface of the sixth lens.

7. The optical lens according to claim 1, wherein the optical lens satisfies the following relationship: 2≤|SAGS4 / SAGS3|≤60, and / or, 3≤CT5 / SAGS9≤5.5, and / or, 1.2≤SAGS12 / SAGS11≤115; wherein, SAGS4 is the sag of the edge of the optical effective diameter of the image side surface of the second lens, SAGS3 is the sag of the edge of the optical effective diameter of the object side surface of the second lens, CT5 is the thickness of the fifth lens on the optical axis, SAGS9 is the sag of the edge of the optical effective diameter of the object side surface of the fifth lens, SAGS12 is the sag of the edge of the optical effective diameter of the image side surface of the sixth lens, and SAGS11 is the sag of the edge of the optical effective diameter of the object side surface of the sixth lens.

8. The optical lens according to any one of claims 1-7, wherein the optical lens satisfies the following relationship: 1.5≤ImgH / F≤1.85, and / or, 108deg / mm≤FOV / F≤150deg / mm, and / or, 120deg≤FOV / FNO≤185deg; wherein, ImgH is half of the image height corresponding to the maximum field of view angle of the optical lens, and F is the effective focal length of the optical lens. The camera module of claim 9 is arranged in the main body. The camera module of claim 9 is arranged in the main body. ​ 9. An image capture module, comprising: The camera module includes a photosensitive chip and the camera module of claim 1 8, the photosensitive chip is disposed on the image side of the optical lens.

10. A terminal device, comprising: ​

Images