Optical lens, camera module and terminal equipment

Abstract

The embodiment of the invention provides an optical lens, a camera module and terminal equipment. From an object side to an image side, the lenses of the optical lens sequentially comprise a first lens with negative refractive power, a second lens with negative refractive power, a third lens with negative refractive power and a fourth lens with negative refractive power, the object side surface and the image side surface of the second lens are concave surfaces; the object side surface and the image side surface of the third lens are convex surfaces; the object side surface and the image side surface of the fourth lens are convex surfaces; the object side surface and the image side surface of the fifth lens are convex surfaces; the object side surface and the image side surface of the sixth lens are concave surfaces; the seventh lens element with positive refractive power has a convex object-side surface and a concave image-side surface. The optical lens meets the relational expression that FOV is larger than or equal to 120 deg and smaller than or equal to 150 deg, and TTL / F is larger than or equal to 6.4 and smaller than or equal to 7.1. The optical lens provided by the embodiment of the invention can meet the requirements of a large view field range and high resolution, and facilitates the improvement of the imaging quality.

Description

Technical Field

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

[0002] As core sensing components for Advanced Driver Assistance Systems (ADAS), automotive optical lenses are facing increasing performance requirements as technology advances. Current automotive optical lenses have limited field of view coverage and low resolution. Therefore, developing optical lenses with both a wide field of view and high resolution has become an urgent industry need. Summary of the Invention

[0003] The embodiments of the present application provide an optical lens, a camera module, and a terminal device to meet the requirements of a large field of view and high resolution, which is conducive to improving the imaging quality of the optical lens.

[0004] In a first aspect, an embodiment of the present application provides an optical lens, comprising seven lenses with refractive power, which include, in order from the object side to the image side along the optical axis: a first lens having negative refractive power, wherein 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 having negative refractive power, wherein the object side surface of the second lens is concave at the near optical axis, and the image side surface of the second lens is concave at the near optical axis; a third lens having positive refractive power, wherein the object side surface of the third lens is convex at the near optical axis, and the image side surface of the third lens is convex at the near optical axis The fourth lens has positive refractive power, and the object-side surface of the fourth lens is convex at the near optical axis, and the image-side surface of the fourth lens is convex at the near optical axis. The fifth lens has positive refractive power, and the object-side surface of the fifth lens is convex at the near optical axis, and the image-side surface of the fifth lens is convex at the near optical axis. The sixth lens has negative refractive power, and the object-side surface of the sixth lens is concave at the near optical axis, and the image-side surface of the sixth lens is concave at the near optical axis. The seventh lens has positive refractive power, and the object-side surface of the seventh lens is convex at the near optical axis, and the image-side surface of the seventh lens is concave at the near optical axis. The optical lens satisfies the following relationship: 120deg≤FOV≤150deg, 6.4≤TTL / F≤7.1. Among them, FOV is the maximum field of view of the optical lens, TTL is the total optical length of the optical lens, and F is the effective focal length of the optical lens.

[0005] In the embodiment of the present application, a first lens element with negative refractive power, coupled with a convex object-side surface and a concave image-side surface near the optical axis, can moderate the angle of the incident light, preventing excessive refraction changes and the resulting aberrations. This can also help increase the field of view and improve the relative illumination of the optical lens. A second lens element with negative refractive power, coupled with concave object-side and image-side surfaces near the optical axis, can initially correct astigmatism in the optical lens while effectively controlling the predominance of light. A third lens element with positive refractive power, coupled with convex object-side and image-side surfaces near the optical axis, can ensure that light diverging from the second lens enters the fourth lens element smoothly. A fourth lens element with positive refractive power, coupled with convex object-side and image-side surfaces near the optical axis, can help suppress light, allowing more light to enter the image-side optical lens and improve the illumination of the optical lens. A fifth lens element with positive refractive power, coupled with convex object-side and image-side surfaces near the optical axis, can further converge light passing through the fourth lens element, ensuring that the light beam converges toward the image plane. Its symmetrical convex surface structure helps balance distortion produced by the front lens group, particularly correcting barrel and pincushion distortion. The negative refractive power of the sixth lens element, combined with concave object-side and image-side surfaces near the optical axis, helps eliminate chromatic aberration. The positive refractive power of the seventh lens element, combined with a convex object-side surface near the optical axis and a concave image-side surface near the optical axis, helps reduce the overall optical length of the lens, thereby facilitating miniaturization.

[0006] In the embodiment of the present application, the FOV of the optical lens satisfies the above-mentioned relationship, which can make the optical lens have a larger field of view, which is beneficial for the optical lens to obtain the subject information within a larger angle, so that the optical lens meets the requirements of a large field of view. The TTL / F of the optical lens satisfies the above-mentioned relationship, which is beneficial to reducing the aberration of the optical lens and improving the modulation transfer function (MTF) of the system, thereby achieving higher resolution and imaging clarity of the optical lens. By controlling the field of view FOV and TTL / F of the optical lens within the above-mentioned range, this embodiment can make the optical lens meet the requirements of a large field of view and high resolution, which is beneficial to improving imaging clarity while achieving wide-angle shooting, thereby improving the imaging quality of the optical lens.

[0007] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 1 ≤ F / ImgH ≤ 1.2, 81 degrees ≤ FOV / FNO ≤ 103 degrees, and 2.5 ≤ ∑CT / ∑AT ≤ 2.8. Wherein, 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, FOV is the maximum field of view of the optical lens, FNO is the aperture number of the optical lens, TTL is the total optical length of the optical lens, ∑CT is the sum of the thicknesses of each lens on the optical axis, and ∑AT is the sum of the air spaces between adjacent lenses among the first to sixth lenses.

[0008] In this implementation, by rationally configuring the ratio of the effective focal length F to the half-image height ImgH of the optical lens, it is beneficial to achieve a wide angular resolution of the optical lens and improve the overall imaging effect of the optical lens. By limiting the FOV / FNO of the optical lens to the above range, the optical lens can achieve a balance between field of view and light throughput, optimize depth of field, improve optical performance in low light conditions, and reduce distortion. By limiting ∑CT / ∑AT to the above range, the thickness and gap of the lens can be balanced, avoiding excessive total optical length (TTL) of the optical lens. This also helps improve the mechanical stability of the optical lens and reduce sensitivity to system tolerances (such as decentering tolerance and tilt tolerance).

[0009] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 1.3≤SD1 / SD14≤1.5, 0.95≤SD6 / SD7≤1.15, and 1.9≤CT4 / ET4≤2.45. Here, SD1 is half the maximum effective aperture of the object-side surface of the first lens element, SD14 is half the maximum effective aperture of the image-side surface of the seventh lens element, SD6 is half the maximum effective aperture of the image-side surface of the third lens element, SD7 is half the maximum effective aperture of the object-side surface of the fourth lens element, CT4 is the thickness of the fourth lens element on the optical axis, and ET4 is the distance from the maximum effective aperture of the object-side surface of the fourth lens element to the maximum effective aperture of the image-side surface of the fourth lens element along the optical axis.

[0010] In this implementation, by limiting SD1 / SD14 to the above range, the aperture of the object side of the first lens can be made larger, which can better control the incident angle of light and reduce spherical aberration; and the smaller aperture of the image side S of the seventh lens can suppress off-axis aberrations (such as coma and astigmatism), thereby achieving aberration balance in the optical lens; in addition, the structure of the optical lens can be made compact, which is conducive to the miniaturization of the optical lens. By limiting SD6 / SD7 to the above range, the apertures of the third lens and the fourth lens can be made closer, which can ensure that the light passing through the third lens and the aperture efficiently enters the fourth lens; and it can avoid that the aperture difference between the third lens and the fourth lens is too large, reducing the ineffective space of the optical lens, which is conducive to the miniaturization of the optical lens. By limiting CT4 / ET4 to the above range, the ratio of the center thickness to the edge thickness of the fourth lens can be reasonably controlled, so that the overall thickness of the fourth lens is reasonable, which is conducive to the miniaturization design of the optical lens.

[0011] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 0.92 ≤ F3 / F4 ≤ 0.96, -10 ≤ F56 / F ≤ -6, and -1 ≤ F2 / R4 ≤ -0.8. Wherein, F3 is the focal length of the third lens element, F4 is the focal length of the fourth lens element, F56 is the combined focal length of the fifth lens element and the sixth lens element, F is the effective focal length of the optical lens element, F2 is the focal length of the second lens element, and R4 is the radius of curvature of the image-side surface of the second lens element at the optical axis.

[0012] In this implementation, by limiting the ratio of the focal lengths of the third lens L3 and the fourth lens L4 to the above range, the focal lengths of the adjacent third and fourth lenses can be made closer, facilitating a smooth transition of light rays to the imaging plane and improving the resolving power of the optical lens. By limiting F56 / F to the above range, excessive spherical aberration introduced by the fifth and sixth lenses can be avoided, thereby improving the resolving power of the optical lens. By limiting F2 / R4 to the above range, the curvature of the second lens can be controlled, reducing the incidence of ghosting. Furthermore, the smaller radius of curvature of the image-side surface of the second lens at the optical axis facilitates wide-angle imaging, suppresses strong divergence of light rays around the imaging area, and suppresses the generation of higher-order aberrations, thereby improving image quality.

[0013] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: -3≤R3 / R4≤-1.8, -1.3≤R8 / R7≤-1.1, and 2.5≤R14 / R13≤3.1. Here, R3 is the radius of curvature of the object side surface of the second lens at the optical axis, R4 is the radius of curvature of the image side surface of the second lens at the optical axis, R8 is the radius of curvature of the image side surface of the fourth lens at the optical axis, R7 is the radius of curvature of the object side surface of the fourth lens at the optical axis, R14 is the radius of curvature of the image side surface of the seventh lens at the optical axis, and R13 is the radius of curvature of the object side surface of the seventh lens at the optical axis.

[0014] In this implementation, by limiting R3 / R4 within the above range, the shapes of the image-side and object-side surfaces of the fourth lens can be reasonably restricted, which is beneficial for controlling light distribution and reducing off-axis aberrations of the optical lens. By limiting R8 / R7 within the above range, the shapes of the image-side and object-side surfaces of the fourth lens can be reasonably restricted, which is beneficial for controlling light distribution and reducing off-axis aberrations of the optical lens. By limiting R14 / R13 within the above range, the shapes of the image-side and object-side surfaces of the seventh lens can be reasonably restricted, which is beneficial for controlling light distribution and reducing off-axis aberrations of the optical lens.

[0015] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: -9.5 ≤ F1 / CT1 ≤ -7.5, 3 ≤ F4 / CT4 ≤ 4, and 4.2 ≤ F7 / CT7 ≤ 5.5, where F1 is the focal length of the first lens element, CT1 is the thickness of the first lens element on the optical axis, F4 is the focal length of the fourth lens element, CT4 is the thickness of the fourth lens element on the optical axis, F7 is the focal length of the seventh lens element, and CT7 is the thickness of the seventh lens element on the optical axis.

[0016] In this implementation, by limiting F1 / CT1 to the above range, incident light entering the optical lens at large angles can be smoothly introduced, thereby expanding the field of view of the optical lens and enabling the optical lens to meet the requirements of a wide field of view. By limiting F4 / CT4 to the above range, the fourth lens can further converge the light projected by the third lens, thereby reducing the optical lens's sensitivity to decentering, which is beneficial for improving the resolution of the optical lens. By limiting F7 / CT7 to the above range, the seventh lens can reconverge the light diverging from the sixth lens, which is beneficial for reducing the total optical length (TTL) of the optical lens and thus facilitating miniaturization of the optical lens.

[0017] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 2.2≤CT3 / CT34≤3.5, 2.6≤CT7 / CT67≤3.1, and 7.5≤TTL / BFL≤9.2. Here, CT3 is the thickness of the third lens element on the optical axis, CT34 is the distance on the optical axis from the image side surface of the third lens element to the object side surface of the fourth lens element, CT7 is the thickness of the seventh lens element on the optical axis, CT67 is the distance on the optical axis from the image side surface of the sixth lens element to the object side surface of the seventh lens element, and BFL is the back focal length of the optical lens.

[0018] In this implementation, by limiting the ratio of CT3 to CT34 within the above range, the thickness and gap of the third lens can be balanced, preventing the total optical length (TTL) of the optical lens from being excessively long. This also helps improve the mechanical stability of the optical lens 300 and reduce sensitivity to system tolerances (such as decentering and tilt tolerances). By limiting the ratio of CT6 to CT67 within the above range, the thickness and gap of the seventh lens can be balanced, preventing the total optical length (TTL) of the optical lens from being excessively long. This also helps improve the mechanical stability of the optical lens and reduce sensitivity to system tolerances (such as decentering and tilt tolerances). By limiting TTL / BFL within the above range, the back focal length of the optical lens can be increased while achieving miniaturization, facilitating assembly of the optical lens. Furthermore, the increased back focal length helps reduce the energy of ghost images reflected from the center of the lens and filter.

[0019] In one implementation of the first aspect, the optical lens satisfies one or more of the following relationships: 1.4 ≤ FNO ≤ 1.47, 6.5 ≤ TTL / ImgH ≤ 8.3, and 2 ≤ F*tan(FOV / 2) / ImgH ≤ 3.8. Wherein, FNO is the aperture number of the optical lens, TTL is the total optical length of the optical lens, ImgH is half the image height corresponding to the maximum field of view angle of the optical lens, F is the effective focal length of the optical lens, and FOV is the maximum field of view angle of the optical lens.

[0020] In this implementation, by ensuring that the aperture number FNO of the optical lens satisfies the above relationship, it is possible to ensure that the optical lens has a large amount of light transmission, improve the exposure efficiency of the optical lens under low light conditions (such as dusk, night, tunnels, rainy and foggy weather, etc.), and at the same time ensure good resolution of the optical lens and improve the imaging quality of the optical lens. By limiting TTL / ImgH to the above range, it is beneficial for the optical lens to meet the requirements of high pixels and large image surface, which is beneficial to improving resolution and thus improving image clarity. By limiting F*tan(FOV / 2) / ImgH to the above range, the optical distortion of the optical lens can be better controlled and the resolution of the optical lens can be improved.

[0021] In a second aspect, embodiments of the present application provide a camera module comprising 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, a camera module comprising any of the aforementioned optical lenses can simultaneously meet the requirements of a large field of view and high resolution, thereby improving the imaging quality of the optical lens.

[0022] In a third aspect, an embodiment of the present application provides a terminal device comprising a main body and the camera module provided in the second aspect of the present application, wherein the camera module is disposed on the main body. In this embodiment, the terminal device having this camera module can simultaneously meet the requirements of a large field of view and high resolution, thereby improving imaging quality and ensuring a good user experience of the terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a terminal device in an embodiment of the present application;

[0024] Figure 2 is a structural diagram of the camera module in the first embodiment;

[0025] Figure 3 yes Figure 2 Schematic diagram of the structure of the optical lens;

[0026] Figure 4 yes Figure 3 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens;

[0027] Figure 5 is a schematic structural diagram of the optical lens in the second embodiment;

[0028] Figure 6 yes Figure 5 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens;

[0029] Figure 7 is a schematic structural diagram of the optical lens in the third embodiment;

[0030] Figure 8 yes Figure 7 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens;

[0031] Figure 9 is a schematic structural diagram of an optical lens in a fourth embodiment;

[0032] Figure 10 yes Figure 9 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens;

[0033] Figure 11 is a schematic structural diagram of an optical lens in a fifth embodiment;

[0034] Figure 12 yes Figure 11 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens;

[0035] Figure 13 is a schematic structural diagram of an optical lens in a sixth embodiment;

[0036] Figure 14 yes Figure 13 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens. DETAILED DESCRIPTION

[0037] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of this application are explained and described below.

[0038] Refractive power is a quantitative indicator of the ability of parallel light to converge or diverge after passing through a lens or optical lens. It is also called refractive power or optical focal length.

[0039] A lens or lens group with positive refractive power has a positive focal length and has the effect of converging light.

[0040] A lens or lens group with negative refractive power has a negative focal length and has the effect of diverging light.

[0041] Focal length, also known as focal length, is a measure of light convergence or divergence in optical lenses. It refers to the vertical distance from the optical center of a lens or lens group to the focal plane, when an object at infinite distance is formed through the lens or lens group. From a practical perspective, it can be understood as the distance from the lens center to the plane when the object is at infinite distance. For fixed-focus lenses, the position of the optical center is fixed; for optical lenses, changes in the optical center result in changes in the lens' focal length.

[0042] The object side is divided by the lens. The side where the object is located is called the object side, and the surface of the lens close to the object side is called the object side.

[0043] The image side, with the lens as the boundary, the side where the image of the object is located is called the image side, and the surface of the lens close to the image side is called the image side.

[0044] The aperture is a device used to control the amount of light that passes through the lens and enters the photosensitive surface inside the camera body. It is usually inside the lens.

[0045] Aperture number, also known as F-number (FNO), is a relative value calculated by dividing the focal length of a lens by the diameter of its entrance pupil (the inverse of the relative aperture). The smaller the aperture number, the more light passes through it per unit time. A larger aperture number reduces the depth of field, blurring the background in photos, similar to the effect of an optical lens.

[0046] Total Track Length (TTL) refers to the total length from the lens surface closest to the object side to the imaging plane on the optical axis.

[0047] Back focal length (BFL) refers to the distance from the last lens or the vertex of the optical element surface to the image plane in an optical lens, also known as the back focal length.

[0048] The imaging plane is located on the image side of all lenses in the optical lens, and is the plane on which the image is formed after the light passes through each lens in the optical lens in sequence.

[0049] The optical axis is an axis that passes vertically through the center of the lens. The optical axis of the lens is the axis that passes through the centers of each lens of the lens.

[0050] Center thickness refers to the thickness of the lens at the optical center point along the optical axis.

[0051] Edge thickness refers to the thickness of the outermost edge of the lens along the optical axis.

[0052] Tangential direction (T): The meridional direction is located in the meridional plane. The meridional plane is a plane formed by the chief ray of the off-axis object point and the optical axis of the optical lens.

[0053] Sagittal direction (S): The sagittal direction lies in the sagittal plane, which is the plane containing the chief ray and is perpendicular to the meridional plane. The sagittal plane intersects the optical axis at the entrance pupil and is perpendicular to the meridional plane.

[0054] Sagittal Height is a parameter that describes the geometric characteristics of the lens surface in optical lens design. The sagittal height of a point on a certain surface of the lens refers to the distance from the point to the intersection of the surface and the optical axis in the direction of the optical axis.

[0055] Focus is the point where parallel light rays converge after being refracted by a lens or group of lenses.

[0056] The Abbe number (Abbe), also known as the dispersion coefficient, is the difference ratio of the refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0057] The Chief Ray Angle (CRA) is a key parameter that measures the maximum angle at which light rays are incident on a sensor pixel, and is also called the principal ray angle.

[0058] In optical instruments, the field of view (FOV) is the angle formed by the two edges of the maximum range through which the image of the measured object can pass through the lens, with the lens as the vertex. The field of view determines the visual range of the optical instrument. The larger the field of view, the greater the field of view and the smaller the optical magnification.

[0059] The half image height ImgH (Image Hight) represents half of the diagonal length of the effective pixel area on the photosensitive chip, that is, half of the image height of the imaging surface.

[0060] Effective Diameter (ED) refers to the diameter of the area in an optical element (such as a lens or prism) that actually participates in imaging or transmitting light. It reflects the maximum physical diameter of a light beam that is not blocked by mechanical structures when passing through the optical element.

[0061] Effective Aperture refers to the ratio of the front mirror beam diameter (or lens diameter) to the focal length when the lens is fully opened. It is the reciprocal of the f-stop number. The maximum effective aperture indicates the maximum light transmission capacity of an optical lens.

[0062] Aberration: The paraxial region of an optical lens has the properties of an ideal optical lens. The paraxial light emitted from a point on the object intersects the image plane at one point (also known as the paraxial image point). However, the light rays that actually pass through the lens with different apertures are unlikely to intersect perfectly at one point. Instead, they have a certain deviation from the position of the paraxial image point. These differences are collectively referred to as aberrations.

[0063] 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 before and after passing through a lens. This aberration is called positional chromatic aberration or axial chromatic aberration. This is because the lens images different wavelengths of light at different positions, causing the focal planes of the different colors of light to not coincide in the final image, resulting in the dispersion of the complex light.

[0064] Lateral chromatic aberration is the 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 edge of the image.

[0065] Distortion, also known as distortion, refers to the degree to which the image formed by an optical lens is distorted relative to the object itself. Distortion is caused by spherical aberration. The height of the intersection of the principal rays of light from different fields of view with the Gaussian image plane after passing through the optical lens is not equal to the ideal image height. The difference between the two is the distortion. Therefore, distortion only changes the image position of off-axis object points on the ideal plane, distorting the image shape but not affecting image clarity.

[0066] Barrel distortion is characterized by the image edges expanding and bending outward, while the central area is relatively normal or slightly convex, and the overall shape resembles the cross-section of a wooden barrel.

[0067] Pincushion distortion is characterized by the image edges shrinking inward and the central area being flat or slightly concave, with the overall shape resembling a pillow.

[0068] Astigmatism occurs when the object point is not on the optical axis of an optical lens. The resulting beam is tilted at an angle to the optical axis. After refraction through the lens, the convergence points of the meridional and sagittal beamlets are not aligned. This means the beam cannot be focused to a single point, resulting in an unclear image. Meridional and sagittal beamlets are the names for beams in two perpendicular planes within a rotationally symmetric optical lens.

[0069] Field curvature describes the difference in the optical axis between the sharpest image point of non-central field rays and the sharpest image point of the central field rays after passing through an optical lens system. When a lens exhibits field curvature, the intersection of the entire light 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.

[0070] Ghosting is a virtual image or light spot formed on the imaging plane after light is reflected or scattered multiple times between optical components such as lenses and sensors. It usually appears as bright spots, halos, or colored streaks that are symmetrical or repeating with the original image. It is common in backlit scenes or scenes with strong light sources.

[0071] Decentering tolerance refers to the parallel offset between the optical axis of an optical component and the mechanical axis, usually measured in microns (μm) or millimeters (mm). For example, the clearance between the outer diameter of a lens and the inner diameter of a lens barrel may cause decentration.

[0072] Tilt tolerance refers to the angular deviation between the optical axis and the mechanical axis, often expressed in arc minutes (') or microradians (μrad). Tilt tolerance, along with the decentration tolerance mentioned above, can disrupt the coaxiality of optical lenses, leading to asymmetric aberrations such as coma and astigmatism, which directly impact imaging resolution.

[0073] Illuminance refers to the visible light flux received per unit area and is used to quantify the intensity of illumination on the surface of an object.

[0074] Modulation Transfer Function (MTF) is the core quantitative indicator for evaluating the imaging quality of optical imaging systems. It objectively reflects the resolution and contrast characteristics of the system by analyzing its ability to transmit information at different spatial frequencies.

[0075] The Camera Monitor System (CMS) is an in-vehicle system that completely replaces traditional optical rearview mirrors. The camera is installed near the traditional rearview mirror on the upper front of the vehicle.

[0076] An embodiment of the present application provides a terminal device, which includes but is not limited to automobiles (including fuel vehicles, electric vehicles and hybrid vehicles, etc.), monitors, mobile phones, tablet computers, laptop computers, 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.

[0077] like Figure 1 As shown, in one embodiment, the terminal device 100 may be, for example, a car. The terminal device 100 may include a main body 101 and a camera module 200. The camera module 200 may be a CMS electronic exterior rearview camera, for example, located where a traditional rearview mirror would be located.

[0078] It is understandable that Figure 1 The structure, size, quantity, and position of the camera module 200 shown are merely illustrative and are not intended to limit this embodiment. In another embodiment, the camera module 200 may be a side rearview camera, a front view camera, or the like, and the camera module 200 may be located below a conventional rearview mirror or at the front of the vehicle.

[0079] Figure 2 FIG. 2 is a structural diagram of a camera module 200 in an embodiment. Figure 2 As shown, the camera module 200 may include a photosensitive chip 201 and an optical lens 300, wherein the photosensitive chip 201 is arranged on the image side of the optical lens 300. The optical lens 300 is used to receive the light signal of the subject and project it to the photosensitive chip 201, and the photosensitive chip 201 is used to convert the light signal corresponding to the subject into an image signal.

[0080] Figure 3 for Figure 2Schematic diagram of the structure of the optical lens 300. Figure 2 and Figure 3 As shown, the optical lens 300 has a total of seven lenses with refractive power, which are the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 from the object side to the image side along the optical axis O. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 in sequence from the object side of the first lens L1, and is finally imaged on the imaging plane (IMG) of the optical lens 300. The imaging plane IMG can be located on the side of the photosensitive chip 201 in the camera module 200 facing the seventh lens L7.

[0081] like Figure 3 As shown, the first lens element L1 has negative refractive power, the object-side surface S1 of the first lens element L1 is convex at the near optical axis O, and the image-side surface S2 of the first lens element L1 is concave at the near optical axis O. This arrangement can make the refraction angle of the incident light change more moderate, avoiding excessive refraction changes that would cause excessive aberrations, and at the same time help increase the field of view of the optical lens element 300 and improve the relative illumination of the optical lens element 300.

[0082] like Figure 3 As shown, the second lens L2 has negative refractive power, and the object-side surface S3 and the image-side surface S4 of the second lens L2 are both concave at the near optical axis. By setting as above, the astigmatism of the optical lens 300 can be preliminarily corrected, while effectively controlling the direction of light.

[0083] like Figure 3 As shown, the third lens L3 has positive refractive power, and both the object-side surface S5 and the image-side surface S6 of the third lens L3 are convex near the optical axis O. By the above arrangement, the light diverged by the second lens L2 can smoothly enter the fourth lens L4.

[0084] like Figure 3 As shown, the fourth lens L4 has positive refractive power, the object-side surface S7 of the fourth lens L4 is convex at the near optical axis O, and the image-side surface S8 of the fourth lens L4 is convex at the near optical axis O. The above arrangement helps to suppress light, allowing more light to enter the optical lens on the image side, thereby improving the illumination of the optical lens 300.

[0085] like Figure 3 As shown, the fifth lens element L5 has positive refractive power, and both its object-side surface S9 and image-side surface S10 are convex near the optical axis O. This arrangement further converges the light rays passing through the fourth lens element L4, ensuring that the beams converge toward the image plane. Its symmetrical convex structure helps balance the distortion produced by the front lens group, particularly correcting barrel and pincushion distortion.

[0086] like Figure 3 As shown, the sixth lens L6 may have negative refractive power, and both the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are concave near the optical axis O. The above arrangement is helpful in eliminating chromatic aberration of the optical lens 300 .

[0087] like Figure 3 As shown, the fifth lens L5 having positive refractive power can be cemented with the sixth lens L6 having negative refractive power to form a doublet lens. This helps reduce chromatic aberration and correct spherical aberration of the optical lens 300, thereby improving the resolution of the optical lens 300, effectively reducing tolerance sensitivity, and enhancing the imaging quality of the optical lens. In another embodiment, the fifth lens L5 and the sixth lens L6 can also be independent lenses.

[0088] like Figure 3 As shown, the seventh lens element L7 may have positive refractive power, the object-side surface S13 of the seventh lens element L7 may be convex at the near optical axis O, and the image-side surface S14 of the seventh lens element L7 may be concave at the near optical axis O. The above arrangement is advantageously used to reduce the total optical length TTL of the optical lens element 300, thereby facilitating miniaturization of the optical lens element 300.

[0089] refer to Figure 1 and Figure 3 As shown, when the optical lens 300 is applied to terminal equipment such as automobiles, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can all be glass, so that the optical lens 300 has good optical effects while reducing the impact of temperature on the above lenses. The optical lens 300 can meet the requirements of clear shooting in environments as low as -40°C and as high as 105°C. In another embodiment, among the multiple lenses of the optical lens 300, some lenses can be made of glass and some lenses can be made of plastic, so as to ensure that while reducing the impact of temperature on the lenses to achieve better imaging quality, it can also reduce the processing cost of the optical lens 300 and reduce the weight of the optical lens 300.

[0090] refer to Figure 3 As shown, when the optical lens 300 is applied to terminal devices such as mobile phones and tablet computers, the material of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be plastic to reduce the overall weight of the optical lens 300.

[0091] refer to Figure 3As shown, in one embodiment, the first lens L1, the fourth lens L4, and the seventh lens L7 may be aspherical lenses, and the second lens L2, the third lens L3, the fifth lens L5, and the sixth lens L6 may all be spherical lenses. Spherical lenses are characterized by simple manufacturing processes and low production costs. Aspherical lenses allow for more flexible design of the object-side or image-side surfaces of the lenses, effectively resolving issues such as unclear imaging, distorted visual field, or a narrow field of view even when the lenses are smaller and thinner, thereby facilitating a reduction in the length of the optical lens 300. The combined design of spherical and aspherical surfaces not only improves the machinability of each lens, facilitating surface design, but also allows for more flexible design of the object-side or image-side surfaces of the lenses, effectively resolving issues such as unclear imaging, distorted visual field, or a narrow field of view even when the lenses are smaller and thinner. Furthermore, the optical lens 300 can achieve good imaging quality without requiring an excessive number of lenses, thus facilitating a reduction in the length of the optical lens 300. It is understandable that, in another embodiment, the surfaces of each lens in the optical lens 300 may all be spherical, all aspherical, or any combination of spherical and aspherical surfaces. The specific selection can be made according to actual needs, so it is not specifically limited in this embodiment.

[0092] like Figure 3 As shown, in one embodiment, the optical lens 300 may further include an aperture STO, which may be an aperture stop and / or a field stop. For example, the aperture STO may be an aperture stop, or the aperture STO may be a field stop, or the aperture STO may be an aperture stop and a field stop. The aperture STO may be used to adjust the amount of light passing through the optical lens 300. The position of the aperture STO may be determined according to product requirements, for example, it may be located between the third lens L3 and the fourth lens L4. In another embodiment, the aperture STO may be located between any two lenses, or on the object side of the first lens L1, which is not limited in this embodiment.

[0093] like Figure 3As shown, in one embodiment, the optical lens 300 may further include an infrared filter (IR), which may be disposed between the seventh lens L7 and the imaging surface IMG of the optical lens 300. Exemplarily, the IR filter may be an infrared cutoff filter to filter out infrared light and pass visible light, making the imaging more consistent with the visual experience of the human eye, thereby improving the imaging quality. In another embodiment, the IR filter may be an infrared bandpass filter to allow infrared light to pass through and reflect 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 imaging quality. It is understandable that the IR filter may be made of plastic, optical glass coating, or other materials for infrared filtering, and may be selected according to actual needs and is not specifically limited in this embodiment. In another embodiment, the optical lens 300 may also not include the IR filter.

[0094] Combine Figure 2 and Figure 3 As shown, in one embodiment, the optical lens 300 may further include a cover glass (CoverGlass, CG), which may 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 cover glass CG may be made of plastic, or may be made of optical glass coating, or may be made of other materials. The selection may be based on actual needs and is not specifically limited in this embodiment. It is understandable that the cover glass CG may be a part of the optical lens 300, or may be removed from the optical lens 300. However, after the cover glass CG is removed, the total optical length TTL of the optical lens 300 remains unchanged.

[0095] In this embodiment, the maximum field of view (FOV) of the optical lens 300 satisfies the relationship: 120 degrees ≤ FOV ≤ 150 degrees. When the optical lens 300 satisfies this relationship, the optical lens 300 can have a larger field of view, which helps the optical lens 300 obtain subject information within a wider angle, thus meeting the requirement of a wide field of view.

[0096] In this embodiment, the total optical length TTL of the optical lens 300 and the effective focal length F of the optical lens 300 can satisfy the relationship: 6.4 ≤ TTL / F ≤ 7.1. Limiting TTL / F to this range helps reduce aberrations in the optical lens 300 and improves the system MTF, thereby achieving higher resolution and imaging clarity for the optical lens 300.

[0097] This embodiment controls the field of view FOV and TTL / F of the optical lens 300 within the above range, so that the optical lens 300 can meet the requirements of both a large field of view and high resolution, which is beneficial for improving imaging clarity while achieving wide-angle shooting, thereby improving the imaging quality of the optical lens 300.

[0098] In some embodiments, the effective focal length F of the optical lens 300 and half the image height ImgH corresponding to the maximum field of view of the optical lens 300 can satisfy the relationship: 1 ≤ F / ImgH ≤ 1.2. Properly configuring the ratio of the effective focal length F of the optical lens to the half image height ImgH facilitates achieving a high angular resolution for the optical lens 300 and improves the overall imaging effect of the optical lens 300.

[0099] In some embodiments, the maximum field of view (FOV) of the optical lens 300 and the aperture number (FNO) of the optical lens 300 can satisfy the relationship: 81 degrees ≤ FOV / FNO ≤ 103 degrees. By limiting the FOV / FNO of the optical lens to this range, the optical lens can achieve a balance between field of view and light throughput, optimize depth of field, improve optical performance in low light conditions, and reduce distortion.

[0100] In some embodiments, the sum of the thicknesses ∑CT of each lens along the optical axis and the sum of the air spacings ∑AT between adjacent lenses among the first lens L1 through the sixth lens L6 can satisfy the relationship: 2.5 ≤ ∑CT / ∑AT ≤ 2.8. By limiting ∑CT / ∑AT to this range, lens thicknesses and air spacings can be balanced, preventing the total optical length (TTL) of the optical lens system 300 from being excessively long. This also improves the mechanical stability of the optical lens system 300 and reduces sensitivity to system tolerances (e.g., decentering and tilt tolerances).

[0101] In some embodiments, half SD1 of the maximum effective aperture of the object-side surface S1 of the first lens L1 and half SD14 of the maximum effective aperture of the image-side surface S14 of the seventh lens L7 can satisfy the relationship: 1.3 ≤ SD1 / SD14 ≤ 1.5. By configuring as described above, the aperture of the object-side surface S1 of the first lens L1 can be made larger, enabling better control of the incident angle of light and reducing spherical aberration. The smaller aperture of the image-side surface S14 of the seventh lens L7 can suppress off-axis aberrations (such as coma and astigmatism), thereby achieving aberration balance in the optical lens. Furthermore, this can make the structure of the optical lens 300 compact, facilitating miniaturization of the optical lens 300.

[0102] In some embodiments, half SD6 of the maximum effective aperture of the image-side surface S6 of the third lens element L3 and half the maximum effective aperture of the object-side surface S7 of the fourth lens element L4 can satisfy the relationship: 0.95 ≤ SD6 / SD7 ≤ 1.15. This arrangement allows the apertures of the third lens element L3 and the fourth lens element L4 to be relatively close, ensuring that light passing through the third lens element L3 and the aperture stop STO efficiently enters the fourth lens element L4. Furthermore, this prevents a significant difference in the apertures of the third lens element L3 and the fourth lens element L4, reducing the dead space within the optical lens element 300 and facilitating miniaturization of the optical lens element 300.

[0103] In some embodiments, the thickness of the fourth lens element L4 along the optical axis O (i.e., the center thickness of the fourth lens element L4) and the distance from the maximum effective aperture of the object-side surface S7 of the fourth lens element L4 to the maximum effective aperture of the image-side surface S8 of the fourth lens element L4 along the optical axis O (i.e., the edge thickness of the fourth lens element L4) may satisfy the relationship: 1.9 ≤ CT4 / ET4 ≤ 2.45. By limiting CT4 / ET4 to this range, the ratio of the center thickness to the edge thickness of the fourth lens element can be reasonably controlled, thereby ensuring a reasonable overall thickness of the fourth lens element, which facilitates the miniaturization of the optical lens design.

[0104] In some embodiments, the focal length F4 of the third lens element L3 and the focal length F4 of the fourth lens element L4 may satisfy the relationship: 0.92 ≤ F3 / F4 ≤ 0.96. By limiting the ratio of the focal lengths of the third lens element L3 and the fourth lens element L4 to the above range, the focal lengths of adjacent third lens elements L3 and fourth lens elements L4 can be relatively close, facilitating a smooth transition of light rays to the imaging plane IMG and improving the resolution of the optical lens system 300.

[0105] In some embodiments, the combined focal length F56 of the fifth lens element L5 and the sixth lens element L6, together with the effective focal length F of the optical lens system 300, may satisfy the relationship: -10 ≤ F56 / F ≤ -6. By limiting F56 / F to this range, excessive spherical aberration introduced by the fifth lens element L5 and the sixth lens element L6 can be avoided, thereby improving the resolving power of the optical lens system 300.

[0106] In some embodiments, the focal length F2 of the second lens element L2 and the radius of curvature R4 of the image-side surface S4 of the second lens element L2 at the optical axis O may satisfy the relationship: -1 ≤ F2 / R4 ≤ -0.8. By limiting F2 / R4 to this range, the curvature of the second lens element L2 can be controlled, reducing the incidence of ghosting. Furthermore, the smaller radius of curvature of the image-side surface S4 of the second lens element L2 at the optical axis O facilitates widening of the viewing angle, suppresses strong divergence of light beams around the imaging area, and reduces the generation of high-order aberrations, thereby improving image quality.

[0107] In some embodiments, the radius of curvature R3 of the object-side surface S3 of the second lens element L2 at the optical axis O and the radius of curvature R4 of the image-side surface S4 of the second lens element L2 at the optical axis O may satisfy the relationship: -3 ≤ R3 / R4 ≤ -1.8. This configuration can reasonably constrain the shapes of the object-side surface S3 and image-side surface S4 of the second lens element L2, facilitating control of light distribution and reducing off-axis aberrations of the optical lens system 300.

[0108] In some embodiments, the radius of curvature R8 of the image-side surface S8 of the fourth lens element L4 at the optical axis O and the radius of curvature R7 of the object-side surface S7 of the fourth lens element L4 at the optical axis O may satisfy the relationship: -1.3 ≤ R8 / R7 ≤ -1.1. This configuration can reasonably restrict the shapes of the image-side surface S8 and the object-side surface S7 of the fourth lens element L4, facilitating control of light distribution and reducing off-axis aberrations of the optical lens system 300.

[0109] In some embodiments, the radius of curvature R14 of the image-side surface S14 of the seventh lens element L7 at the optical axis O and the radius of curvature R13 of the object-side surface S13 of the seventh lens element L7 at the optical axis O may satisfy the relationship: 2.5 ≤ R14 / R13 ≤ 3.1. This configuration can reasonably limit the shapes of the image-side surface S14 and the object-side surface S13 of the seventh lens element L7, facilitating control of light distribution and reducing off-axis aberrations of the optical lens system 300.

[0110] In some embodiments, the focal length F1 of the first lens element L1 and its thickness along the optical axis O (i.e., the center thickness of the first lens element L1) can satisfy the relationship: -9.5 ≤ F1 / CT1 ≤ -7.5. By limiting F1 / CT1 to this range, incident light at wide angles can be smoothly transmitted into the optical lens 300, thereby expanding the field of view of the optical lens 300 and meeting the requirements of a wide field of view.

[0111] In some embodiments, the focal length F4 of the fourth lens element L4 and its thickness along the optical axis O (i.e., the center thickness of the fourth lens element L4) may satisfy the relationship: 3 ≤ F4 / CT4 ≤ 4. By limiting F4 / CT4 to this range, the fourth lens element L4 can further converge light projected by the third lens element L3, thereby reducing the decentering sensitivity of the optical lens system 300 and improving the resolution of the optical lens system 300.

[0112] In some embodiments, the focal length F7 of the seventh lens element L7 and its thickness along the optical axis O (i.e., the center thickness of the seventh lens element L7) may satisfy the relationship: 4.2 ≤ F7 / CT7 ≤ 5.5. By limiting F7 / CT7 to this range, the seventh lens element L7 can converge light rays diverged by the sixth lens element L6, thereby reducing the total optical length (TTL) of the optical lens system 300 and facilitating miniaturization of the optical lens system 300.

[0113] In some embodiments, the thickness of the third lens L3 along the optical axis O (i.e., the center thickness of the third lens L3) and the distance along the optical axis O from the image-side surface S6 of the third lens L3 to the object-side surface S7 of the fourth lens L4 (i.e., the gap between the third lens L3 and the fourth lens L4 at the optical axis O) can satisfy the relationship: 2.2 ≤ CT3 / CT34 ≤ 3.5. By limiting the ratio of CT3 to CT34 within this range, the thickness of the third lens L3 and the gap can be balanced, preventing the total optical length (TTL) of the optical lens 300 from being excessively long. This also helps improve the mechanical stability of the optical lens 300 and reduce sensitivity to system tolerances (e.g., decentering and tilt tolerances).

[0114] In some embodiments, the thickness of the seventh lens element L7 along the optical axis O and the distance from the image-side surface S12 of the sixth lens element L6 to the object-side surface S13 of the seventh lens element L7 along the optical axis O (i.e., the gap between the sixth lens element L6 and the seventh lens element L7 along the optical axis O) may satisfy the relationship: 2.6 ≤ CT7 / CT67 ≤ 3.1. By limiting the ratio of CT6 to CT67 within this range, the thickness of the seventh lens element L7 and the gap can be balanced, preventing the total optical length (TTL) of the optical lens system 300 from being excessively long. Furthermore, this improves the mechanical stability of the optical lens system 300 and reduces sensitivity to system tolerances (e.g., decentering and tilt tolerances).

[0115] In some embodiments, the total optical length (TTL) and back focal length (BFL) of the optical lens 300 can satisfy the relationship: 7.5 ≤ TTL / BFL ≤ 9.2. By limiting TTL / BFL to this range, the back focal length of the optical lens 300 can be increased while miniaturizing the optical lens 300, facilitating assembly of the optical lens 300. Furthermore, the increased back focal length helps reduce the energy of ghost images reflected from the center of the lens and the IR filter.

[0116] In some embodiments, the aperture number of the optical lens 300 can satisfy the relationship: 1.4 ≤ FNO ≤ 1.47. By ensuring that the aperture number FNO of the optical lens 300 satisfies this relationship, the optical lens 300 can have a large light throughput, improving the exposure efficiency of the optical lens 300 in low-light conditions (such as dusk, night, tunnels, rainy and foggy weather, etc.), while also ensuring good resolution of the optical lens 300 and improving the imaging quality of the optical lens 300.

[0117] In some embodiments, the total optical length (TTL) of the optical lens 300 and half of the image height (ImgH) corresponding to the maximum field of view of the optical lens 300 can satisfy the relationship: 6.5 ≤ TTL / ImgH ≤ 8.3. Limiting TTL / ImgH to this range helps the optical lens 300 meet the requirements of high pixel count and a large image area, thereby improving resolution and thereby enhancing image clarity.

[0118] In some embodiments, the effective focal length F of the optical lens 300, the maximum field of view (FOV) of the optical lens 300, and half the image height corresponding to the maximum field of view of the optical lens 300 can satisfy the relationship: 2 ≤ F * tan(FOV / 2) / ImgH ≤ 3.8. This arrangement effectively controls optical distortion of the optical lens 300 and improves the resolution of the optical lens 300.

[0119] In some embodiments, half the image height ImgH corresponding to the maximum field of view of the optical lens 300, the maximum field of view FOV of the optical lens 300, and the effective focal length F of the optical lens 300 can satisfy the relationship: -0.994 ≤ (ImgH - FOV*F) / (FOV*F) ≤ -0.993. This arrangement ensures that while the field of view FOV of the optical lens 300 and the size of the imaging surface IMG remain unchanged, the focal length of the optical lens 300 can be increased, thereby highlighting the imaging effect of the central area of ​​the imaging surface IMG of the lens.

[0120] In some embodiments, half SD14 of the maximum effective aperture of the image-side surface S14 of the seventh lens element L7, the back focal length BFL of the optical lens element 300, and half the image height corresponding to the maximum field angle of the optical lens element 300, ImgH, may satisfy the relationship: 3.6 ≤ SD14 * BFL / ImgH ≤ 3.9. This arrangement allows the back focal length of the optical lens element 300 to be controlled while maintaining the size of the imaging surface IMG and the image height, thereby facilitating the realization of a smaller chief ray angle.

[0121] In some embodiments, the Abbe number VD5 of the fifth lens element L5, the Abbe number VD6 of the sixth lens element L6, and the combined focal length F56 of the fifth lens element L5 and the sixth lens element L6 can satisfy the relationship: -1.9 ≤ (VD5 VD6) / F56 ≤ -1.2. This arrangement effectively corrects chromatic aberration of the optical lens system 300, restores color fidelity, and improves image quality.

[0122] In some embodiments, the focal length F1 of the first lens L1 and the effective focal length F of the optical lens 300 may satisfy the relationship: -2.5 ≤ F1 / F ≤ -2.2. When the optical lens 300 satisfies this relationship, by properly 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, aberrations can be effectively corrected, and the resolving power of the optical lens 300 can be improved.

[0123] In some embodiments, the focal length F2 of the second lens L2 and the effective focal length F of the optical lens 300 may satisfy the relationship: -1.8 ≤ F2 / F ≤ -1.5. When the optical lens 300 satisfies this relationship, by properly 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, aberrations can be effectively corrected, and the resolving power of the optical lens 300 can be improved.

[0124] In some embodiments, the focal length F3 of the third lens L3 and the effective focal length F of the optical lens 300 may satisfy the relationship: 2.2 ≤ F3 / F ≤ 2.3. When the optical lens 300 satisfies this relationship, by properly 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 resolution of the optical lens 300.

[0125] In some embodiments, the focal length F4 of the fourth lens element L4 and the effective focal length F of the optical lens system 300 may satisfy the relationship: 2.3 ≤ F4 / F ≤ 2.45. When the optical lens system 300 satisfies this relationship, by properly adjusting the ratio of the focal length F4 of the fourth lens element L4 to the effective focal length F of the optical lens system 300, excessive spherical aberration introduced by the fourth lens element L4 can be avoided, thereby improving the resolution of the optical lens system 300.

[0126] In some embodiments, the focal length F5 of the fifth lens element L5 and the effective focal length F of the optical lens system 300 may satisfy the relationship: 1.95 ≤ F5 / F ≤ 2.2. When the optical lens system 300 satisfies this relationship, by properly configuring the ratio of the focal length F5 of the fifth lens element L5 to the effective focal length F of the optical lens system 300, excessive spherical aberration introduced by the fifth lens element L5 can be avoided, thereby improving the resolution of the optical lens system 300.

[0127] In some embodiments, the focal length F6 of the sixth lens element L6 and the effective focal length F of the optical lens system 300 may satisfy the relationship: -1.5 ≤ F6 / F ≤ -1.3. When the optical lens system 300 satisfies this relationship, by properly configuring the ratio of the focal length F6 of the sixth lens element L6 to the effective focal length F of the optical lens system 300, excessive spherical aberration introduced by the sixth lens element L6 can be avoided, aberrations can be effectively corrected, and the resolving power of the optical lens system 300 can be improved.

[0128] In some embodiments, the focal length F7 of the seventh lens element L7 and the effective focal length F of the optical lens system 300 may satisfy the relationship: 3.2 ≤ F7 / F ≤ 3.8. When the optical lens system 300 satisfies this relationship, by properly adjusting the ratio of the focal length F7 of the seventh lens element L7 to the effective focal length F of the optical lens system 300, excessive spherical aberration introduced by the seventh lens element L7 can be avoided, thereby improving the resolution of the optical lens system 300.

[0129] In some embodiments, the focal length F2 of the second lens element L2 and its thickness along the optical axis O (i.e., the center thickness of the second lens element L2) may satisfy the relationship: -12 ≤ F2 / CT2 ≤ -8. By limiting F2 / CT2 to this range, aberrations of the optical lens 300 can be corrected, thereby improving the resolution of the optical lens 300.

[0130] In some embodiments, the focal length F3 of the third lens element L3 and its thickness along the optical axis O (i.e., the center thickness of the second lens element L2) may satisfy the relationship: 1.3 ≤ F3 / CT3 ≤ 1.9. By limiting F3 / CT3 to this range, light can be smoothly directed into the fourth lens element L4.

[0131] In some embodiments, the focal length F5 of the fifth lens element L5 and its thickness along the optical axis O (i.e., the central thickness of the fifth lens element L5) may satisfy the relationship: 2.6 ≤ F5 / CT5 ≤ 3.3. By limiting F5 / CT5 to this range, the fifth lens element L5 can further converge light projected by the fourth lens element L4, thereby reducing the decentering sensitivity of the optical lens 300 and improving the resolution of the optical lens.

[0132] In some embodiments, the focal length F6 of the sixth lens element L6 and its thickness along the optical axis O (i.e., the central thickness of the sixth lens element L6) can satisfy the relationship: -11 ≤ F6 / CT6 ≤ -3.5. By limiting F6 / CT6 to this range, the sixth lens element L6 can effectively correct aberrations caused by light deflected by the various lens elements on the object side, thereby improving the resolving power of the optical lens system 300.

[0133] The optical lens 300 of this embodiment will be described in detail below with reference to specific parameters.

[0134] First embodiment

[0135] 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 STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter IR, and a cover glass CG, which are arranged in order from the object side to the image side along the optical axis O. 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, the sixth lens L6 has negative refractive power, and the seventh lens L7 has positive refractive power.

[0136] like Figure 3 As shown, the object-side surface S1 of the first lens L1 is convex at the near optical axis O, and the image-side surface S2 of the first lens L1 is concave at the near optical axis O; the object-side surface S3 and the image-side surface S4 of the second lens L2 are both concave at the near optical axis O; the object-side surface S5 and the image-side surface S6 of the third lens L3 are both convex at the near optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex at the near optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex at the near optical axis O; the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both concave at the near optical axis O; the object-side surface S13 of the seventh lens L7 is convex at the near optical axis O, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis O.

[0137] The Y radius in Table 1a is the radius of curvature of the object-side or image-side surface of the corresponding surface number at optical axis O. The first value in the "Thickness" column for a lens is the thickness of the lens along 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 of the lens along optical axis O. The value in the "Thickness" column for the aperture STO is the distance from the aperture STO to the vertex of the rear surface (the vertex refers to the intersection of the surface with the optical axis O) along optical axis O. It should be understood that the units of the Y radius, thickness, and focal length in Table 1a are all in mm, and the reference wavelength for the refractive index, Abbe number, and focal length of each lens in Table 1a is 453 nm.

[0138] The surface shape of each aspheric lens can be defined using, but not limited to, the following aspheric formula:

[0139]

[0140] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, c is the curvature of the aspheric vertex, c = 1 / Y, Y is the radius of curvature (i.e., the paraxial curvature c is the reciprocal of the Y radius in Table 1), r is the distance from any point on the aspheric surface to the optical axis O, k is the cone constant, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula.

[0141] In the first embodiment, both the object-side surface S1 and the image-side surface S2 of the first lens element L1 are aspherical surfaces, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspherical surfaces, and both the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspherical surfaces. Table 1b lists the conic constant k and the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the various aspherical surfaces in the first embodiment.

[0142]

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

[0144]

[0145] Table 1b Surface parameters of each aspheric surface of the optical lens in the first embodiment

[0146] Figure 4 The imaging quality of the optical lens 300 in the first embodiment is characterized. Figure 4 (A) in FIG. 1 shows the longitudinal spherical aberration curves of the optical lens 300 in the first embodiment at wavelengths of 508 nm, 477 nm, 453 nm, 441 nm, and 414 nm, respectively. The horizontal axis represents the focus offset 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.

[0147] Figure 4 (B) in the figure shows the astigmatism curve of the optical lens 300 in the first embodiment at a wavelength of 453 nm. The horizontal axis represents the focus offset in mm, and the vertical axis represents the field angle in degrees. In the astigmatism curve, T represents the curvature of the imaging surface IMG in the meridional direction, and S represents the curvature of the imaging surface IMG in the sagittal direction. Figure 4 As shown in (B) in FIG. 3 , at this wavelength, the astigmatism of the optical lens 300 is well compensated.

[0148] Figure 4(C) in the figure shows the distortion curve of the optical lens 300 in the first embodiment at a wavelength of 453 nm. The horizontal axis represents the distortion in %, and the vertical axis represents the field angle in degrees. Figure 4 As shown in (C) in FIG. 3 , at this wavelength, the distortion of the optical lens 300 is well corrected.

[0149] Second embodiment

[0150] like Figure 5 As shown, in the second embodiment, the optical lens 300 includes a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter IR, and a cover glass CG, which are arranged in order from the object side to the image side along the optical axis O. 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, the sixth lens L6 has negative refractive power, and the seventh lens L7 has positive refractive power.

[0151] like Figure 5 As shown, the object-side surface S1 of the first lens L1 is convex at the near optical axis O, and the image-side surface S2 of the first lens L1 is concave at the near optical axis O; the object-side surface S3 and the image-side surface S4 of the second lens L2 are both concave at the near optical axis O; the object-side surface S5 and the image-side surface S6 of the third lens L3 are both convex at the near optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex at the near optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex at the near optical axis O; the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both concave at the near optical axis O; the object-side surface S13 of the seventh lens L7 is convex at the near optical axis O, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis O.

[0152] The Y radius in Table 2a is the radius of curvature of the object-side or image-side surface of the corresponding surface number at optical axis O. The first value in the "Thickness" column for a lens is the thickness of the lens along 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 of the lens along optical axis O. The value in the "Thickness" column for the aperture STO is the distance from the aperture STO to the vertex of the rear surface (the vertex refers to the intersection of the surface with the optical axis O) along optical axis O. It should be understood that the units of the Y radius, thickness, and focal length in Table 2a are all in mm, and the reference wavelength for the refractive index, Abbe number, and focal length of each lens in Table 1a is 603 nm.

[0153] In the second embodiment, both the object-side surface S1 and the image-side surface S2 of the first lens element L1 are aspherical surfaces, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspherical surfaces, and both the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspherical surfaces. Table 2b lists the conic constant k and the 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 shapes of each aspherical surface can be defined by the formulas given in the first embodiment.

[0154]

[0155]

[0156] Table 2a Partial parameters of the optical lens in the second embodiment

[0157]

[0158] Table 2b Surface parameters of each aspheric surface of the optical lens in the second embodiment

[0159] Figure 6 This characterizes the imaging quality of the optical lens 300 in the second embodiment. Figure 6 (A) in the figure shows the longitudinal spherical aberration curves of the optical lens 300 in the second embodiment at wavelengths of 665 nm, 634 nm, 603 nm, 571 nm and 540 nm, respectively. The horizontal axis represents the focus offset in mm, and the vertical axis represents the normalized field of view. Figure 6 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.

[0160] Figure 6 (B) in the figure shows the astigmatism curve of the optical lens 300 in the second embodiment at a wavelength of 603 nm. The horizontal axis represents the focus offset in mm, and the vertical axis represents the image height in mm. In the astigmatism curve, T represents the curvature of the imaging surface IMG in the meridional direction, and S represents the curvature of the imaging surface IMG in the sagittal direction. Figure 6 As shown in (B) in FIG. 3 , at this wavelength, the astigmatism of the optical lens 300 is well compensated.

[0161] Figure 6 (C) in the figure shows the distortion curve of the optical lens 300 in the second embodiment at a wavelength of 603 nm. The horizontal axis represents the distortion in %, and the vertical axis represents the image height in mm. Figure 6 As shown in (C) in FIG. 3 , at this wavelength, the distortion of the optical lens 300 is well corrected.

[0162] Third embodiment

[0163] 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 STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter IR, and a cover glass CG, which are arranged in order from the object side to the image side along the optical axis O. 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, the sixth lens L6 has negative refractive power, and the seventh lens L7 has positive refractive power.

[0164] like Figure 7 As shown, the object-side surface S1 of the first lens L1 is convex at the near optical axis O, and the image-side surface S2 of the first lens L1 is concave at the near optical axis O; the object-side surface S3 and the image-side surface S4 of the second lens L2 are both concave at the near optical axis O; the object-side surface S5 and the image-side surface S6 of the third lens L3 are both convex at the near optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex at the near optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex at the near optical axis O; the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both concave at the near optical axis O; the object-side surface S13 of the seventh lens L7 is convex at the near optical axis O, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis O.

[0165] Table 3a shows some parameters of the optical lens 300 in the third embodiment. The meaning of each parameter is shown in Table 2a and will not be repeated here.

[0166] In the third embodiment, both the object-side surface S1 and the image-side surface S2 of the first lens element L1 are aspherical surfaces, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspherical surfaces, and both the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspherical surfaces. Table 3b lists the conic constant k and the 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 shapes of each aspherical surface can be defined by the formulas given in the first embodiment.

[0167]

[0168] Table 3a Partial parameters of the optical lens in the third embodiment

[0169]

[0170] Table 3b Surface parameters of each aspheric surface of the optical lens in the third embodiment

[0171] See also Figure 8,from Figure 8 As can be seen from the (A) spherical aberration curve, (B) light astigmatism diagram, and (C) distortion curve diagram, the spherical aberration, astigmatism, and distortion of the optical lens 300 are all well controlled, so that the optical lens 300 of the third embodiment has good imaging quality. Figure 8 (A) Figure 8 (B) and Figure 8 The wavelengths corresponding to the curves in (C) can be referred to in the second embodiment. Figure 6 (A) Figure 6 (B) Figure 6 The contents described in (C) will not be repeated here.

[0172] Fourth embodiment

[0173] 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 STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter IR, and a cover glass CG, which are arranged in order from the object side to the image side along the optical axis O. 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, the sixth lens L6 has negative refractive power, and the seventh lens L7 has positive refractive power.

[0174] like Figure 9 As shown, the object-side surface S1 of the first lens L1 is convex at the near optical axis O, and the image-side surface S2 of the first lens L1 is concave at the near optical axis O; the object-side surface S3 and the image-side surface S4 of the second lens L2 are both concave at the near optical axis O; the object-side surface S5 and the image-side surface S6 of the third lens L3 are both convex at the near optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex at the near optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex at the near optical axis O; the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both concave at the near optical axis O; the object-side surface S13 of the seventh lens L7 is convex at the near optical axis O, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis O.

[0175] The Y radius in Table 4a is the radius of curvature of the object-side or image-side surface of the corresponding surface number at optical axis O. The first value in the "Thickness" column for a lens is the thickness of the lens along 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 of the lens along optical axis O. The value in the "Thickness" column for the aperture STO is the distance from the aperture STO to the vertex of the rear surface (the vertex refers to the intersection of the surface with the optical axis O) along optical axis O. It should be understood that the units of the Y radius, thickness, and focal length in Table 4a are all in mm, and the reference wavelength for the refractive index, Abbe number, and focal length of each lens in Table 4a is 540 nm.

[0176] In the fourth embodiment, both the object-side surface S1 and the image-side surface S2 of the first lens element L1 are aspherical surfaces, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspherical surfaces, and both the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspherical surfaces. Table 4b lists the conic constant k and the 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 shapes of each aspherical surface can be defined by the formulas given in the first embodiment.

[0177]

[0178] Table 4a Partial parameters of the optical lens in the fourth embodiment

[0179]

[0180]

[0181] Table 4b Surface parameters of each aspheric surface of the optical lens in the fourth embodiment

[0182] Figure 10 The imaging quality of the optical lens 300 in the fourth embodiment is characterized. Figure 10 (A) in the figure shows the longitudinal spherical aberration curves of the optical lens 300 in the fourth embodiment at wavelengths of 603 nm, 571 nm, 540 nm, 508 nm and 477 nm, respectively. The horizontal axis represents the focus offset in mm, and the vertical axis represents the normalized field of view. Figure 10 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.

[0183] Figure 10(B) in the figure shows the astigmatism curve of the optical lens 300 in the fourth embodiment at a wavelength of 540 nm. The horizontal axis represents the focus offset in mm, and the vertical axis represents the image height in mm. In the astigmatism curve, T represents the curvature of the imaging surface IMG in the meridional direction, and S represents the curvature of the imaging surface IMG in the sagittal direction. Figure 10 As shown in (B) in FIG. 3 , at this wavelength, the astigmatism of the optical lens 300 is well compensated.

[0184] Figure 10 (C) in the figure shows the distortion curve of the optical lens 300 in the fourth embodiment at a wavelength of 540 nm. The horizontal axis represents the distortion in %, and the vertical axis represents the image height in mm. Figure 10 As shown in (C) in FIG. 3 , at this wavelength, the distortion of the optical lens 300 is well corrected.

[0185] Fifth embodiment

[0186] 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, a stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a filter IR, and a cover glass CG, which are arranged in order from the object side to the image side along the optical axis O. 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, the sixth lens L6 has negative refractive power, and the seventh lens L7 has positive refractive power.

[0187] like Figure 11 As shown, the object-side surface S1 of the first lens L1 is convex at the near optical axis O, and the image-side surface S2 of the first lens L1 is concave at the near optical axis O; the object-side surface S3 and the image-side surface S4 of the second lens L2 are both concave at the near optical axis O; the object-side surface S5 and the image-side surface S6 of the third lens L3 are both convex at the near optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex at the near optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex at the near optical axis O; the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both concave at the near optical axis O; the object-side surface S13 of the seventh lens L7 is convex at the near optical axis O, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis O.

[0188] Table 5a shows some parameters of the optical lens 300 in the fifth embodiment. The meaning of each parameter is shown in Table 2a and will not be repeated here.

[0189] In the fifth embodiment, both the object-side surface S1 and the image-side surface S2 of the first lens element L1 are aspherical surfaces, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspherical surfaces, and both the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspherical surfaces. Table 5b lists the conic constant k and the 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 shapes of each aspherical surface can be defined by the formulas given in the first embodiment.

[0190]

[0191]

[0192] Table 5a Partial parameters of the optical lens in the fifth embodiment

[0193]

[0194] Table 5b Surface parameters of each aspheric surface of the optical lens in the fifth embodiment

[0195] See also Figure 12 ,from Figure 12 As can be seen from the (A) spherical aberration curve, (B) light astigmatism diagram, and (C) distortion curve diagram, the spherical aberration, astigmatism, and distortion of the optical lens 300 are all well controlled, so that the optical lens 300 of the fifth embodiment has good imaging quality. Figure 12 (A) Figure 12 (B) and Figure 12 The wavelengths corresponding to the curves in (C) can be referred to in the second embodiment. Figure 6 (A) Figure 6 (B) Figure 6 The contents described in (C) will not be repeated here.

[0196] Sixth embodiment

[0197] 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 STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter IR, and a cover glass CG, arranged in order from the object side to the image side along the optical axis O. 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, the sixth lens L6 has negative refractive power, and the seventh lens L7 has positive refractive power.

[0198] like Figure 13As shown, the object-side surface S1 of the first lens L1 is convex at the near optical axis O, and the image-side surface S2 of the first lens L1 is concave at the near optical axis O; the object-side surface S3 and the image-side surface S4 of the second lens L2 are both concave at the near optical axis O; the object-side surface S5 and the image-side surface S6 of the third lens L3 are both convex at the near optical axis O; the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both convex at the near optical axis O; the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both convex at the near optical axis O; the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are both concave at the near optical axis O; the object-side surface S13 of the seventh lens L7 is convex at the near optical axis O, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis O.

[0199] Table 6a shows some parameters of the optical lens 300 in the sixth embodiment. The meaning of each parameter is shown in Table 2a and will not be repeated here.

[0200] In the sixth embodiment, both the object-side surface S1 and the image-side surface S2 of the first lens element L1 are aspherical surfaces, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are aspherical surfaces, and both the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspherical surfaces. Table 6b lists the conic constant k and the 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 shapes of each aspherical surface can be defined by the formulas given in the first embodiment.

[0201]

[0202] Table 6a Partial parameters of the optical lens in the sixth embodiment

[0203]

[0204] Table 6b Surface parameters of each aspheric surface of the optical lens in the sixth embodiment

[0205] See also Figure 14 ,from Figure 14 As can be seen from the (A) spherical aberration curve, (B) light astigmatism diagram, and (C) distortion curve diagram, the spherical aberration, astigmatism, and distortion of the optical lens 300 are all well controlled, so that the optical lens 300 of the sixth embodiment has good imaging quality. Figure 14 (A) Figure 14 (B) and Figure 14 The wavelengths corresponding to the curves in (C) can be referred to in the second embodiment. Figure 6 (A) Figure 6 (B) Figure 6 The contents described in (C) will not be repeated here.

[0206] Table 7 shows the FOV, TTL / F, F / ImgH, FOV / FNO, ∑CT / ∑AT, SD1 / SD14, SD6 / SD7, CT4 / ET4, F3 / F4, F56 / F, F2 / R2, R3 / R4, R8 / R7, R14 / R13, F1 / CT1, F4 / CT4, F7 / CT7, CT3 / CT34, CT7 / C The values ​​of T67, TTL / BFL, FNO, TTL / ImgH, F*tan(FOV / 2) / ImgH, (ImgH-FOV*F) / (FOV*F), SD14*BFL / ImgH, (VD5-VD6) / F56, F1 / F, F2 / F, F3 / F, F4 / F, F5 / F, F6 / F, F7 / F, F2 / CT2, F3 / CT3, F5 / CT5, and F6 / CT6. All of these values ​​can satisfy the relationship described above.

[0207]

[0208] Table 7 Partial parameters of the optical lenses in the first to sixth embodiments

[0209] In the description of the embodiments of the present application, unless otherwise specified, "plurality" refers to two or more.

[0210] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood to suggest or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Features qualified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0211] The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," "side," "top," and "bottom," are merely references to directions in the accompanying drawings. These directional terms are intended to better and more clearly illustrate and understand the embodiments of this application, and are not intended to explicitly or implicitly indicate that the devices or components referred to must have a specific orientation, be constructed or operate in a specific orientation, and are therefore not to be construed as limiting the embodiments of this application.

[0212] In the description of the embodiments of this application, unless otherwise specified, "and / or" is simply a description of an association relationship between associated objects, indicating that three relationships can exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone.

[0213] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An optical lens, characterized in that: There are seven lenses with refractive power, including the following from the object side to the image side along the optical axis: a first lens having negative refractive power, wherein 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 element having negative refractive power, wherein the object-side surface of the second lens element is concave at the near optical axis, and the image-side surface of the second lens element is concave at the near optical axis; a third lens having positive refractive power, wherein the object-side surface of the third lens is convex at the near optical axis, and the image-side surface of the third lens is convex at the near optical axis; a fourth lens element having positive refractive power, wherein the object-side surface of the fourth lens element is convex at the near optical axis, and the image-side surface of the fourth lens element is convex at the near optical axis; a fifth lens element having positive refractive power, wherein the object-side surface of the fifth lens element is convex at the near optical axis, and the image-side surface of the fifth lens element is convex at the near optical axis; a sixth lens element having negative refractive power, wherein the object-side surface of the sixth lens element is concave near the optical axis, and the image-side surface of the sixth lens element is also concave near the optical axis; a seventh lens element having positive refractive power, wherein the object-side surface of the seventh lens element is convex at the near optical axis, and the image-side surface of the seventh lens element is concave at the near optical axis; The optical lens satisfies the following relationship: 120deg≤FOV≤150deg, 6.4≤TTL / F≤7.1; Wherein, FOV is the maximum field of view of the optical lens, TTL is the total optical length of the optical lens, and F is the effective focal length of the optical lens.

2. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: 1≤F / ImgH≤1.2, and / or, 81deg≤FOV / FNO≤103deg, and / or, 2.5≤∑CT / ∑AT≤2.8; Wherein, ImgH is half of the image height corresponding to the maximum field of view angle of the optical lens, FNO is the aperture number of the optical lens, ∑CT is the sum of the thicknesses of each lens on the optical axis, and ∑AT is the sum of the air gaps between adjacent two lenses from the first lens to the sixth lens.

3. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: 1.3≤SD1 / SD14≤1.5, and / or, 0.95≤SD6 / SD7≤1.15, and / or, 1.9≤CT4 / ET4≤2.45; Among them, SD1 is half of the maximum effective aperture of the object side of the first lens, SD14 is half of the maximum effective aperture of the image side of the seventh lens, SD6 is half of the maximum effective aperture of the image side of the third lens, SD7 is half of the maximum effective aperture of the object side of the fourth lens, CT4 is the thickness of the fourth lens on the optical axis, and ET4 is the distance from the maximum effective aperture of the object side of the fourth lens to the maximum effective aperture of the image side of the fourth lens in the direction of the optical axis.

4. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: 0.92≤F3 / F4≤0.96, and / or, -10≤F56 / F≤-6, and / or, -1≤F2 / R4≤-0.8; Among them, F3 is the focal length of the third lens, F4 is the focal length of the fourth lens, F56 is the combined focal length of the fifth lens and the sixth lens, F2 is the focal length of the second lens, and R4 is the curvature radius of the image side surface of the second lens at the optical axis.

5. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: -3≤R3 / R4≤-1.8, and / or, -1.3≤R8 / R7≤-1.1, and / or, 2.5≤R14 / R13≤3.1; Among them, R3 is the curvature radius of the object side surface of the second lens at the optical axis, R4 is the curvature radius of the image side surface of the second lens at the optical axis, R8 is the curvature radius of the image side surface of the fourth lens at the optical axis, R7 is the curvature radius of the object side surface of the fourth lens at the optical axis, R14 is the curvature radius of the image side surface of the seventh lens at the optical axis, and R13 is the curvature radius of the object side surface of the seventh lens at the optical axis.

6. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: -9.5≤F1 / CT1≤-7.5, and / or, 3≤F4 / CT4≤4, and / or, 4.2≤F7 / CT7≤5.5; Among them, F1 is the focal length of the first lens, CT1 is the thickness of the first lens on the optical axis, F4 is the focal length of the fourth lens, CT4 is the thickness of the fourth lens on the optical axis, F7 is the focal length of the seventh lens, and CT7 is the thickness of the seventh lens on the optical axis.

7. The optical lens according to claim 1, wherein: The optical lens satisfies the following relationship: 2.2≤CT3 / CT34≤3.5, and / or, 2.6≤CT7 / CT67≤3.1, and / or 7.5≤TTL / BFL≤9.2; Among them, 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, CT7 is the thickness of the seventh lens on the optical axis, CT67 is the distance from the image side surface of the sixth lens to the object side surface of the seventh lens on the optical axis, and BFL is the back focal length of the optical lens.

8. The optical lens according to any one of claims 1 to 7, wherein: The optical lens satisfies the following relationship: 1.4≤FNO≤1.47, and / or, 6.5≤TTL / ImgH≤8.3, and / or, 2≤F*tan(FOV / 2) / ImgH≤3.8; Wherein, FNO is the aperture number of the optical lens, and ImgH is half of the image height corresponding to the maximum field angle of the optical lens.

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

10. A terminal device, characterized in that: It comprises a main body and the camera module according to claim 9, wherein the camera module is arranged on the main body.

Images