Optical lens, camera module and terminal

Abstract

An optical lens (10), a camera module (100) and a terminal (1000). The optical lens (10) comprises at least seven lenses, each lens comprising an object-side surface facing an object side and an image-side surface facing an image side. The at least seven lenses comprise a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6) and a seventh lens (L7) which are sequentially arranged in a direction from the object side to the image side, wherein the first lens (L1) has a positive optical power, the first lens (L1) has a refractive index greater than or equal to 1.6, the sag height at an edge of the image-side surface of the third lens (L3) is greater than 0.3 mm, and the sag height at an edge of the object-side surface of the third lens (L3) is greater than zero. The optical lens (10) can have a good light-ray converging capability, and it can be ensured that the optical lens (10) has both a good imaging capability and a smaller total optical length, thereby facilitating the miniaturization of the optical lens (10). The arrangement of the optical lens (10) on the terminal (1000) facilitates the thinning of the terminal.

Description

Optical lenses, camera modules and terminals

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on January 31, 2024, with application number 202410143365.3 and application name “Optical lens, camera module and terminal”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of lens technology, and in particular to an optical lens, a camera module and a terminal. Background Art

[0003] Portable devices are trending towards thinner designs, and consumers are increasingly demanding higher quality camera images from these devices. To meet these demands, the thickness of camera modules is increasing. Camera module size is often a major factor limiting the thinning of mobile devices, especially when the camera module is configured with a large aperture. The large amount of light entering the optical lens requires a longer light processing path, resulting in a larger camera module. Therefore, balancing the image quality and thickness of the optical lens—developing an optical lens that can accommodate a large aperture and has a smaller body length—has become an unresolved issue in the industry and a key challenge in the thinning of portable devices.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide an optical lens, a camera module, and a terminal to obtain an optical lens with good imaging effects and a smaller optical body length, which is conducive to the thinning development of the terminal.

[0006] In a first aspect, an embodiment of the present application provides an optical lens, comprising at least seven lenses, each lens including an object-side surface facing the object side and an image-side surface facing the image side, the at least seven lenses including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side, wherein the first lens has positive optical power, a refractive index of the first lens is greater than or equal to 1.6, a sagittal height at an edge of the image-side surface of the third lens is greater than 0.3 mm, and a sagittal height at an edge of the object-side surface of the third lens is greater than zero.

[0007] It can be understood that the sag of a lens surface represents the distance between the projection point of any point on the lens surface on the optical axis and the center point of the lens surface. When the projection point of the point is on the image side of the lens surface, the sag of the point is a positive number. When the projection point of the point is on the object side of the lens surface, the sag of the point is a negative number.

[0008] Using a first lens with a refractive index greater than or equal to 1.6 can produce a first lens with excellent light-gathering performance and a small thickness. Furthermore, the third lens having the aforementioned characteristics can further converge light and adjust light aberrations. The optical lens in this embodiment can have excellent light-gathering capabilities, ensuring excellent imaging capabilities while also having a shorter optical body length, facilitating the placement of the optical lens. This can particularly help achieve a thinner terminal when the optical lens is placed in a terminal.

[0009] In some possible implementations, the first lens is made of glass, which has a wider range of refractive index options and can meet the refractive index requirements of the first lens.

[0010] In some possible implementations, all lenses except the first lens are made of resin material. Resin material is easy to mold and process, can meet the refractive requirements of the lens and is easy to mold, and is convenient for manufacturing optical lenses.

[0011] In some possible implementations, the back focal length (BFL) of the optical lens and the total optical length (TTL) of the optical lens satisfy the following relationship: 4 ≤ TTL / BFL ≤ 7. An optical lens satisfying this relationship has a larger back focal length (BFL) and a smaller optical body length (TTL1), resulting in better imaging performance at a larger aperture.

[0012] The above embodiment also allows the optical lens to be suitable for a pop-up camera module. The larger back focal length BFL can reserve space for the movement of the optical lens, allowing the optical lens to move at least part of the distance inside the shell when the camera module is switched to a non-working state, thereby reducing the gap between the optical lens and the photosensitive element, so as to reduce the height of the optical lens protruding from the terminal, which is conducive to achieving a thin design for the terminal using the camera module.

[0013] In some possible implementations, the ratio of the focal length f1 of the first lens in the optical lens to the system focal length f of the optical lens satisfies f1 / f≤1. The first lens having a focal length that satisfies the above relationship can perform a good light-gathering effect, ensuring that the optical lens can better converge light.

[0014] In some possible implementations, the ratio of the focal length f2 of the second lens to the system focal length f of the optical lens satisfies -2≤f2 / f≤0. The second lens satisfying the above relationship can effectively control the propagation direction of light.

[0015] In some possible implementations, the paraxial region of the sixth lens element has positive power and functions to converge light in the paraxial region.

[0016] In some possible implementations, the radius of curvature of the center of the image-side surface of the sixth lens is less than 0, that is, the shape of the center of the image-side surface of the sixth lens is convex, and the sixth lens can achieve good light-focusing effect in the paraxial region.

[0017] In some possible implementations, the paraxial region of the seventh lens element has negative optical power. In this implementation, the paraxial region of the seventh lens element has the function of diverging light, adaptively adjusting the direction of light in the paraxial region of the seventh lens element, and improving imaging quality.

[0018] In some possible embodiments, the radius of curvature at the center of the object-side surface of the seventh lens element is less than 0. The object-side surface of the seventh lens element whose radius of curvature satisfies the above relationship is concave, which can effectively control the direction of light in the paraxial region. Combined with the property of the seventh lens element having negative optical power, it is possible to adjust the position at which light is emitted while diverging light, so that the light can achieve good convergent imaging on the imaging surface.

[0019] In some possible implementations, the system focal length f of the optical lens and the entrance pupil diameter (EPD) of the optical lens may satisfy the following relationship: f / EPD ≤ 1.55. It is understood that the aperture value of the optical lens is equal to the ratio of the system focal length f of the optical lens to the entrance pupil diameter (EPD) of the optical lens. An optical lens that satisfies the above relationship has an aperture value less than 1.55, and the optical lens has a large aperture photography mode, which can better highlight the subject and simplify the image.

[0020] In some possible implementations, the optical lens may satisfy the relationship f / (EPDmax - EPDmin) ≥ 1.6, where EPDmax is the maximum entrance pupil diameter of the optical lens, and EPDmin is the minimum entrance pupil diameter of the optical lens. An optical lens that satisfies this relationship has a variable aperture. Within the adjustable aperture range, the optical lens can provide different depths of field for different scenes, meeting the shooting requirements of multiple scenarios.

[0021] In some possible implementations, the maximum semi-field of view (Semi-FOV) of the optical lens is less than or equal to 43°. The optical lens in this implementation has less optical distortion when used as a primary camera lens, and can provide good imaging effects.

[0022] In some possible implementations, the optical lens's system focal length f and its maximum half-field-of-view (Semi-FOV) satisfy the following relationship: f × tan(Semi-FOV) ≥ 7.5 mm. This optical lens design is suitable for use with photosensitive elements with larger target surfaces, enabling camera modules equipped with this optical lens to have larger target surfaces, thereby improving image brightness and resolution.

[0023] In some possible implementations, the system focal length f of the optical lens and the maximum half field of view Semi-FOV of the optical lens satisfy the relationship of f×tan(Semi-FOV)≥8mm.

[0024] The following uses an optical lens comprising seven lenses as an example to illustrate several specific structural forms of the optical lens. For example, along the direction from the object side to the image side, the seven lenses of the optical lens are respectively the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens.

[0025] Among them, the first lens has positive focal power, the second lens has negative focal power, the third lens has positive focal power, the fourth lens has positive focal power, the fifth lens has negative focal power, the sixth lens has positive focal power, and the seventh lens has negative focal power. The sag of the edge of the image side surface of the third lens satisfies the relationship of sag = 0.48 mm; the system focal length f and the entrance pupil diameter EPD satisfy the relationship of f / EPD = 1.51; the curvature radius R12 of the image side surface of the sixth lens satisfies the relationship of R12 = -3.03; the system focal length f and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin satisfy the relationship of f / (EPDmax-EPDmin) = 2.44; the system focal length f and the maximum half field of view Semi-FOV satisfy the relationship of f×tan(Semi-FOV) = 8.235; the maximum half field of view Semi-FOV satisfies the relationship of Semi-FOV = 41.26°; the focal length f1 of the first lens L1 and the system focal length f satisfy the relationship of f1 / f = 0.825; the focal length f2 of the second lens L2 and the system focal length f satisfy the relationship of f2 / f = -1.452.

[0026] Alternatively, the first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, the fourth lens has positive optical power, the fifth lens has negative optical power, the sixth lens has positive optical power, and the seventh lens has negative optical power. The sag of the edge of the image side surface of the third lens satisfies the relationship of sag = 0.46 mm; the system focal length f and the entrance pupil diameter EPD satisfy the relationship of f / EPD = 1.52; the curvature radius R12 of the image side surface of the sixth lens satisfies the relationship of R12 = -2.93; the system focal length f and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin satisfy the relationship of f / (EPDmax-EPDmin) = 2.46; the system focal length f and the maximum half field of view Semi-FOV satisfy the relationship of f×tan(Semi-FOV) = 8.22; the maximum half field of view Semi-FOV satisfies the relationship of Semi-FOV = 41.2°; the focal length f1 of the first lens and the system focal length f satisfy the relationship of f1 / f = 0.825; the focal length f2 of the second lens and the system focal length f satisfy the relationship of f2 / f = -1.461.

[0027] Alternatively, the first lens has positive optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has negative optical power, the sixth lens has positive optical power, and the seventh lens has negative optical power. The sag of the edge of the image side surface of the third lens satisfies the relationship of sag = 0.412 mm; the system focal length f and the entrance pupil diameter EPD satisfy the relationship of f / EPD = 1.48; the curvature radius R12 of the image side surface of the sixth lens satisfies the relationship of R12 = -3.31; the system focal length f and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin satisfy the relationship of f / (EPDmax-EPDmin) = 2.35; the system focal length f and the maximum half field of view Semi-FOV satisfy the relationship of f×tan(Semi-FOV) = 8.08; the maximum half field of view Semi-FOV satisfies the relationship of Semi-FOV = 41.17°; the focal length f1 of the first lens and the system focal length f satisfy the relationship of f1 / f = 0.8345; the focal length f2 of the second lens and the system focal length f satisfy the relationship of f2 / f = -1.3464.

[0028] Alternatively, the first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, the fourth lens has positive optical power, the fifth lens has negative optical power, the sixth lens has positive optical power, and the seventh lens has negative optical power. The sag of the edge of the image side surface of the third lens satisfies the relationship sag = 0.462 mm; the system focal length f and the entrance pupil diameter EPD satisfy the relationship f / EPD = 1.485; the curvature radius R12 of the image side surface of the sixth lens satisfies the relationship R12 = -2.945; the system focal length f and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin satisfy the relationship f / (EPDmax-EPDmin) = 2.46; the system focal length f and the maximum half field of view Semi-FOV satisfy the relationship f×tan(Semi-FOV) = 8.22; the maximum half field of view Semi-FOV satisfies the relationship Semi-FOV = 41.2°; the focal length f1 of the first lens and the system focal length f satisfy the relationship f1 / f = 0.825; the focal length f2 of the second lens and the system focal length f satisfy the relationship f2 / f = -1.461.

[0029] Alternatively, the first lens has positive optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has negative optical power, the sixth lens has positive optical power, and the seventh lens has negative optical power. The sag of the edge of the image side surface of the third lens satisfies the relationship of sag = 0.3248 mm; the system focal length f and the entrance pupil diameter EPD satisfy the relationship of f / EPD = 1.38; the curvature radius R12 of the image side surface of the sixth lens satisfies the relationship of R12 = -3.315; the system focal length f and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin satisfy the relationship of f / (EPDmax-EPDmin) = 2.285; the system focal length f and the maximum half field of view Semi-FOV satisfy the relationship of f×tan(Semi-FOV) = 7.806; the maximum half field of view Semi-FOV satisfies the relationship of Semi-FOV = 40.56°; the focal length f1 of the first lens and the system focal length f satisfy the relationship of f1 / f = 0.837; the focal length f2 of the second lens and the system focal length f satisfy the relationship of f2 / f = -1.468.

[0030] In a second aspect, the present application further provides a camera module comprising a photosensitive element and an optical lens according to any of the aforementioned possible embodiments, wherein the photosensitive element is located on the image side of the optical lens. The photosensitive element can be used to convert the light signal transmitted by the optical lens into an image signal, and the camera module has good shooting effects.

[0031] In one possible embodiment, the camera module has a first state and a second state. In the first state, the distance between the seventh lens of the optical lens and the photosensitive element is a first distance. In the second state, the distance between the seventh lens of the optical lens and the photosensitive element is a second distance, and the second distance is greater than the first distance.

[0032] The camera module in the above embodiment has a first state close to the photosensitive element and a second state away from the photosensitive element, so that the camera module can be arranged close to the photosensitive element in the first state to have a relatively small height, which is beneficial to the arrangement of the camera module and facilitates the realization of a thin design of the terminal where the camera module is arranged. In the second state, the camera module has a longer back focal length, so that the captured image has better image quality, thereby improving the shooting effect of the system.

[0033] In a third aspect, the present application further provides a terminal comprising an image processor and a camera module according to any of the aforementioned possible embodiments, the image processor being communicatively connected to the camera module, the camera module being configured to acquire image data and input the image data into the image processor, and the image processor being configured to process the image data output therefrom. The terminal has excellent imaging performance and facilitates a thin design. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] FIG1 is a schematic structural diagram of a terminal provided by an exemplary embodiment of the present application;

[0036] FIG2 is a schematic structural diagram of a terminal provided in another exemplary embodiment of the present application;

[0037] FIG3 is a schematic structural diagram of a camera module, an analog-to-digital converter, an image processor, and a memory provided in an exemplary embodiment of the present application;

[0038] FIG4 is a schematic structural diagram of an optical lens provided in the first embodiment of the present application;

[0039] FIG5 is a schematic structural diagram of an optical lens provided in the first embodiment of the present application, wherein lines are used to exemplarily illustrate the propagation path of light in the optical lens;

[0040] FIG6 is a graph showing an axial chromatic aberration curve of the optical lens provided in the first embodiment of the present application;

[0041] FIG7 is a graph showing the optical distortion of the optical lens provided in the first embodiment of the present application;

[0042] FIG8 is a schematic structural diagram of an optical lens provided in a second embodiment of the present application;

[0043] FIG9 is a schematic structural diagram of an optical lens provided in a second embodiment of the present application, wherein lines are used to exemplarily illustrate the propagation path of light in the optical lens;

[0044] FIG10 is a graph showing axial chromatic aberration of the optical lens provided in the second embodiment of the present application;

[0045] FIG11 is a graph showing optical distortion of an optical lens according to a second embodiment of the present application;

[0046] FIG12 is a schematic structural diagram of an optical lens provided in a third embodiment of the present application;

[0047] FIG13 is a schematic structural diagram of an optical lens provided in a third embodiment of the present application, wherein lines are used to exemplarily illustrate the propagation path of light in the optical lens;

[0048] FIG14 is a graph showing axial chromatic aberration of the optical lens provided in the third embodiment of the present application;

[0049] FIG15 is a graph showing optical distortion of an optical lens according to a third embodiment of the present application;

[0050] FIG16 is a schematic structural diagram of an optical lens provided in a fourth embodiment of the present application;

[0051] FIG17 is a schematic structural diagram of an optical lens provided in a fourth embodiment of the present application, wherein lines are used to exemplarily illustrate the propagation path of light in the optical lens;

[0052] FIG18 is a graph showing axial chromatic aberration of the optical lens provided in the fourth embodiment of the present application;

[0053] FIG19 is a graph showing optical distortion of an optical lens according to a fourth embodiment of the present application;

[0054] FIG20 is a schematic structural diagram of an optical lens provided in a fifth embodiment of the present application;

[0055] FIG21 is a schematic structural diagram of an optical lens provided in a fifth embodiment of the present application, wherein lines are used to exemplarily illustrate the propagation path of light in the optical lens;

[0056] FIG22 is a graph showing axial chromatic aberration of the optical lens provided in the fifth embodiment of the present application;

[0057] FIG23 is a graph showing the optical distortion of the optical lens according to the fifth embodiment of the present application. DETAILED DESCRIPTION

[0058] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0059] First, a unified explanation of terms that may be involved in the embodiments of the present invention is given.

[0060] Optical axis: refers to a line of light that passes perpendicularly through the optical center of the lens. When light parallel to the optical axis enters a convex lens, an ideal convex lens should have all the light rays converge at a single point behind the lens. This point where all the light rays converge is the focal point.

[0061] Imaging plane: This refers to the plane where the image of the object is formed after the optical system forms the image. A photosensitive element can be set on the imaging plane to record the image of the object.

[0062] Object side and image side: With the lens as the boundary, the side where the photographed object is located is the object side, and the surface of the lens facing the object side can be called the object side; with the lens as the boundary, the other side opposite to the object side is the image side, and the surface of the lens facing the image side can be called the image side.

[0063] Optical power, positive optical power, negative optical power: Optical power refers to the ability of a lens or a local area of ​​a lens to diverge or converge light; positive optical power can also be called positive refractive power, which means that the lens or a local area of ​​the lens has a positive focal length and the ability to converge light; negative optical power can also be called negative refractive power, which means that the lens or a local area of ​​the lens has a negative focal length and the ability to diverge light.

[0064] Focal length: Also known as focal length, it's a measure of how light converges or diverges. It refers to the distance between the optical center of a lens or lens and the image plane when an object at infinite distance forms a sharp image on the image plane. The focal length of a lens is the distance from the lens's optical center to the image plane. For fixed-focus lenses, the optical center is fixed; for zoom lenses, changes in the optical center result in changes in the lens' focal length.

[0065] Back focal length (BFL): also known as back focal length, is the minimum distance on the optical axis between the lens with optical power and closest to the imaging plane in an optical system and the imaging plane.

[0066] Total track length (TTL): It is the maximum distance between the lens closest to the object and the imaging surface on the optical axis in the optical system.

[0067] Optical body length: This is the maximum distance along the optical axis between the lens closest to the object and the lens closest to the imaging plane. Optical body length is the primary factor in determining the height of an optical lens along the optical axis.

[0068] Aperture: A device used to control the amount of light entering the camera body through the lens, typically located within the lens. The aperture size is typically expressed as an f-stop (F / number). The f-stop is equal to the ratio of the focal length of the optical system to the diameter of the entrance pupil. Aperture values ​​can be expressed as F / 1.2, F / 1.8, F / 2.5, F / 3.0, F / 4.8, or F / 5.0. The smaller the f-stop, the more light enters per unit time. A variable aperture is an aperture whose f-stop value can be adjusted.

[0069] Entrance pupil diameter (EPD) refers to the diameter of the largest beam of light entering the lens perpendicularly from the object side, parallel to the optical axis. The entrance pupil diameter is equal to the ratio of the focal length of the optical system to the aperture value. It is understood that in an optical system with a variable aperture, the entrance pupil diameter varies with the aperture value of the variable aperture. When the aperture value of the variable aperture is the smallest within its variable range, the optical system's entrance pupil diameter is at its maximum; when the aperture value of the variable aperture is the largest within its variable range, the optical system's entrance pupil diameter is at its minimum.

[0070] Field of view (FOV): The angle between the two edges of the maximum range through which the image of the target can pass through the lens, with the lens as the vertex, is called the FOV. The FOV determines the visual range of the optical system. The semi-FOV (semi-FOV) is half the FOV.

[0071] Aperture stop: includes aperture stop and field stop. The aperture stop is used to limit the width of the imaging beam, determine the entrance pupil diameter of the optical system and the solid angle of the light beam, and affect the amount of light entering the optical system; the field stop is used to limit the field of view of the object space that can be imaged by the optical system.

[0072] 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 occurs because the lens images different wavelengths of light at different positions, resulting in the focal planes of the different colors not coinciding with each other, causing the complex colors to disperse and form dispersion.

[0073] Distortion, also known as distortion, refers to the degree to which the image formed by an optical system is distorted relative to the object itself. Distortion is caused by spherical aberration. The height at which the chief rays of light from different fields of view intersect the Gaussian image plane after passing through the optical system 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.

[0074] The following will describe the specific structures of the terminal 1000, the camera module 100 and the optical lens 10 in detail with reference to the relevant drawings.

[0075] As shown in Figure 1, the first aspect of the present application provides a terminal 1000, which can be a mobile phone, tablet computer, laptop computer, video camera, video recorder, camera, smart TV, network monitoring device, somatosensory game console, driving recorder, reversing imaging device, wearable electronic device, small drone, three-dimensional image capture device, or other device with photo or video recording function. Figure 1 is a schematic structural diagram of the terminal 1000 of an embodiment of the present application, in which the terminal 1000 in this embodiment is a mobile phone, wherein the back panel of the terminal 1000 is shown. The embodiment of the present application is described by taking the terminal 1000 as a mobile phone as an example.

[0076] The terminal 1000 may include a camera module 100 and an image processor 300, the image processor 300 is communicatively connected to the camera module 100, the camera module 100 is used to acquire image data and input the image data into the image processor 300, and the image processor 300 is used to process the image data input therein. In actual applications, the terminal 1000 also includes a housing, the camera module 100 and the image processor 300 are both housed inside the housing, the housing is provided with a light hole, and the light incident side of the camera module 100 is arranged opposite to the light hole of the housing. In some embodiments, the communication connection between the camera module 100 and the image processor 300 may include data transmission through electrical connection methods such as wiring, or data transmission may be achieved through coupling and the like. The camera module 100 and the image processor 300 may also achieve communication connection through any other method that can achieve data transmission, and this application does not impose specific restrictions on this.

[0077] The image processor 300 optimizes and processes the digital image signal through a series of mathematical algorithms, ultimately transmitting the processed signal to a display or memory. The image processor 300 can be an image processing chip or a digital signal processing (DSP) chip. Its function is to promptly and quickly transmit data obtained by the camera module 100's photosensitive element to the central processing unit and refresh the photosensitive element. Therefore, the quality of the DSP chip directly affects image quality (e.g., color saturation, clarity, etc.). The image processor 300 can also be integrated into other chips (such as a central processing unit).

[0078] In the embodiment shown in FIG1 , the camera module 100 is disposed on the back of the terminal 1000, serving as the rear camera of the terminal 1000. In some embodiments, the camera module 100 may alternatively be disposed on the front of the terminal 1000, serving as the front camera of the terminal 1000. Both the front and rear cameras can be used for selfies or for the photographer to capture other objects.

[0079] In some embodiments, the terminal 1000 may be provided with a plurality of camera modules 100, where a plurality refers to two or more. Different camera modules 100 may have the same or different structures and performances to meet different camera requirements. For example, in some embodiments, the plurality of camera modules 100 include a zoom camera module or a fixed-focus camera module to respectively realize the functions of zoom shooting and fixed-focus shooting. The plurality of camera modules 100 may all be communicatively connected to the image processor 300, and the plurality of camera modules 100 may selectively cooperate to achieve better shooting effects.

[0080] It should be understood that the installation position of the camera module 100 of the terminal 1000 in the embodiment shown in FIG1 is merely illustrative. In some other embodiments, the camera module 100 may also be installed at other locations on the mobile phone, for example, the camera module 100 may be installed at the upper portion, upper left corner, or upper right corner of the back of the mobile phone. Alternatively, the camera module 100 may not be installed on the main body of the mobile phone, but may be installed on a component that is movable or rotatable relative to the mobile phone, for example, the component may be extended, retracted, or rotated from the main body of the mobile phone, etc. This application does not impose any restrictions on the installation position of the camera module 100.

[0081] As shown in FIG2 , in some embodiments, the terminal 1000 may further include an analog-to-digital converter 200 (also referred to as an A / D converter). The analog-to-digital converter 200 is connected between the camera module 100 and the image processor 300. The analog-to-digital converter 200 is used to convert the signal generated by the camera module 100 into a digital image signal and transmit it to the image processor 300. The image processor 300 then processes the digital image signal and ultimately displays the image or video on a display screen or monitor.

[0082] In some embodiments, the terminal 1000 may further include a memory 400, which is communicatively connected to the image processor 300. The image processor 300 processes the digital image signal and then transfers the image to the memory 400, so that when the image needs to be viewed later, the image can be retrieved from the storage at any time and displayed on the display screen. In some embodiments, the image processor 300 also compresses the processed digital image signal and then stores it in the memory 400 to save space in the memory 400. It will be understood that Figure 2 is only a structural diagram of the terminal 1000 provided in an exemplary embodiment of the present application, and the position structure of the camera module 100, image processor 300, analog-to-digital converter 200, and memory 400 shown therein are only for illustration, and this application does not limit their position and specific structure.

[0083] In a second aspect, an embodiment of the present invention provides a camera module 100, which includes a photosensitive element 20 and an optical lens 10, wherein the photosensitive element 20 is located on the image side of the optical lens 10. As shown in FIG3 , FIG3 shows a schematic structural diagram of the camera module 100 provided in an exemplary embodiment of the present application.

[0084] Referring to FIG3 , based on the above embodiment, the working principle of the camera module 100 is as follows: the light reflected by the object is projected onto the surface of the photosensitive element 20 through the optical lens 10 to generate an optical image. The photosensitive element 20 converts the optical image into an electrical signal to obtain an analog image signal Sig1, and transmits the converted analog image signal Sig1 to the analog-to-digital converter 200, which then converts the converted analog image signal Sig2 to the image processor 300. The image processor 300 can display the digital image signal Sig2 as an image or video on a display screen or monitor. Alternatively, the image processor 300 can process the digital image signal Sig2 and then transmit it to the memory 400, so that the image can be retrieved from the storage at any time and displayed on the display screen when the image needs to be viewed later.

[0085] Specifically, the camera module 100 may further include a circuit board (not shown), the photosensitive element 20 being fixed to the circuit board by bonding or patching, and the analog-to-digital converter 200, the image processor 300, the memory 400, etc. being also connected to the circuit board by bonding or patching, thereby achieving communication connection between the photosensitive element 20, the analog-to-digital converter 200, the image processor 300, the memory 400, etc. through the circuit board. The circuit board may be a flexible printed circuit (FPC) or a printed circuit board (PCB) for transmitting electrical signals, wherein the FPC may be a single-sided flexible board, a double-sided flexible board, a multi-layer flexible board, a rigid-flexible board, or a flexible circuit board with a hybrid structure.

[0086] A photosensitive element is a semiconductor chip with hundreds of thousands to millions of photodiodes on its surface. When exposed to light, they generate an electric charge, which is converted into a digital signal by an analog-to-digital converter chip. A photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS). A CCD is made of a highly sensitive semiconductor material that converts light into an electric charge, which is then converted into a digital signal by an analog-to-digital converter chip. A CCD consists of many photosensitive units, typically measured in millions of pixels. When light strikes the CCD surface, each photosensitive unit reflects the charge on its own component. The signals generated by all the photosensitive units are combined to form a complete image. CMOS primarily utilizes semiconductors made of silicon and germanium, resulting in the coexistence of semiconductors with N (negatively charged) and P (positively charged) polarities on the CMOS chip. The current generated by these two complementary effects is recorded and interpreted as an image by the analog-to-digital converter chip.

[0087] In this embodiment, the terminal 1000 can use a photosensitive element 20 with a large target surface. Taking the terminal 1000 as a mobile phone as an example, the mobile phone in the related art usually uses a photosensitive element with a target surface of 2 / 3 inches or 1 / 1.8 inches, and the mobile phone in the embodiment of the present application can use a photosensitive element 20 with a target surface greater than or equal to 1 inch. Alternatively, it can also be understood that the mobile phone can use a photosensitive element of a SLR camera. Since the photosensitive element 20 in this embodiment has a large target surface and a larger effective photosensitive area, it is beneficial to improve the imaging clarity of the camera module 100 and improve the imaging quality.

[0088] Of course, in other embodiments, the photosensitive element 20 may also use a smaller target surface, and the camera module 100 may select photosensitive elements 20 with target surfaces of different sizes as needed. In embodiments where the terminal 1000 has multiple camera modules 100, different camera modules 100 may use photosensitive elements 20 with target surfaces of different sizes to meet different imaging requirements. In other embodiments, multiple camera modules 100 may also share a single photosensitive element 20, or at least two of the multiple camera modules 100 may share a single photosensitive element.

[0089] In some embodiments, the camera module 100 may further include a driving member (not shown) and a housing. The housing includes a through hole and a receiving space, the through hole is connected to the receiving space, the through hole is arranged relative to the light hole of the housing, and the driving member, the photosensitive element 20 and the optical lens 10 are all accommodated in the receiving space. The photosensitive element 20 is located on the image side of the optical lens 10 and on the imaging surface of the optical lens 10. The driving member is used to drive the components in the optical lens 10 to achieve focusing, and the light incident side of the optical lens 10 is arranged toward the through hole. In other embodiments, the camera module 100 may not have a housing, and the photosensitive element 20 is fixed to a bracket or other structure.

[0090] In some embodiments, the driving member can be used to drive the relevant elements of the optical lens 10 to achieve focus or anti-shake of the optical lens 10 (or camera module 100). The driving member may include one or more driving units, and the driving unit is used to drive the relevant elements of the optical lens 10 to focus and / or optical image stabilization. When the driving member drives the relevant elements of the optical lens 10 to focus, the driving unit drives the relevant elements of the optical lens 10 to move relative to each other to achieve focus. When the driving member drives the relevant elements of the optical lens 10 to anti-shake, the driving unit drives the relevant elements of the optical lens 10 to move or rotate relative to the photosensitive element 20, and / or drives the relevant elements of the optical lens 10 to move or rotate relative to each other to achieve optical image stabilization. Among them, the driving unit can be specifically a driving structure such as a motor or an electric motor.

[0091] Since the total optical length of the optical lens 10 affects the overall height of the camera module 100, and the overall height of the camera module 100 is an important reference indicator for the size design of the terminal 1000, in order to reduce the overall height of the camera module 100, in some embodiments, the driving member can also be used to drive the optical lens 10 away from or closer to the photosensitive element 20 to enable the camera module 100 to have different states. As an exemplary embodiment, the optical lens 10 of the camera module 100 can adopt a pop-up design.

[0092] Exemplarily, the camera module 100 has a first state and a second state. In the first state, the distance between the lens in the optical lens 10 closest to the photosensitive element 20 and the photosensitive element 20 is a first distance. In the second state, the distance between the lens in the optical lens 10 closest to the photosensitive element 20 and the photosensitive element 20 is a second distance, and the second distance is greater than the first distance.

[0093] In the above embodiment, when the camera module 100 is in the first state, the optical lens 10 is arranged close to the photosensitive element 20 and is in a non-pop-up state. The total optical length of the optical lens 10 is relatively small, which is conducive to achieving a thin design for the terminal 1000 using the camera module 100. Taking the terminal 1000 as a mobile phone as an example, when the camera module 100 is in the first state, the camera module 100 is in a non-working state, the optical lens 10 is arranged close to the photosensitive element 20, and the height of the optical lens 10 protruding from the terminal shell is relatively small, which does not restrict the thin design of the terminal 1000, so that the terminal 1000 can have a good light and thin feel. When the camera module 100 needs to be used, the optical lens 10 at least partially extends from the light inlet to the shell to switch the camera module 100 from the first state to the second state. In the second state, the camera module 100 can perform a shooting function. The optical lens 10 is away from the photosensitive element 20, thereby having a relatively long back focus, which can facilitate the focusing or zooming operation of the camera module 100 and help the camera module 100 achieve better shooting effects. In this embodiment, the camera module 100 can drive the optical lens 10 to move by a driving member or a motor to drive the camera module 100 to switch between the first state and the second state. This application does not impose specific limitations on this.

[0094] In some embodiments, the optical lens 10 may further include an infrared filter, which may be disposed at one end of the optical lens 10 facing the image side and between the lens closest to the imaging surface in the optical lens 10 and the imaging surface. The light passing through each lens of the optical lens 10 is irradiated onto the infrared filter, and after being filtered by the infrared filter, is irradiated onto the photosensitive element 20 disposed on the imaging surface. The infrared filter can eliminate unnecessary light projected onto the photosensitive element 20, prevent the photosensitive element 20 from generating false colors or ripples, and thereby improve its effective resolution and color reproduction. In other embodiments, the infrared filter may also be fixed to the circuit board where the photosensitive element 20 is located. Other components included in the camera module 100 will not be described in detail here.

[0095] In other embodiments, an imaging correction element may be further provided on a side of the optical lens 10 close to the imaging surface to achieve an image correction effect (such as bending, etc.).

[0096] The structure of the optical lens 10 and the settings of related optical parameters will be described in detail below with reference to the accompanying drawings.

[0097] As shown in FIG3 , in some embodiments, the present application provides an optical lens 10, which may include at least seven lenses, each lens L including an object-side surface facing the object side and an image-side surface facing the image side, and the at least seven lenses L include a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7, which are arranged in sequence from the object side to the image side, wherein the first lens L1 has positive refractive power, a refractive index of the first lens L1 is greater than 1.6, a sagittal height at an edge of the image-side surface of the third lens L3 is greater than 0.3 mm, and a sagittal height at an edge of the object-side surface of the third lens L3 is greater than zero.

[0098] It is understood that the optical lens 10 is composed of multiple different lenses, and different lens combinations (such as the order of the lenses along the optical path, lens materials, refractive index, shape curvature, etc.) result in different optical performance. The lenses closer to the object side of the optical lens 10 have a greater responsibility for adjusting the optical path and are therefore more important for adjusting the optical effect. The present embodiment imposes restrictions on the optical performance of the first lens L1 and the third lens L3, which are described below in conjunction with specific embodiments.

[0099] First lens L1 has positive focal power, meaning it functions as a light-gathering lens. The refractive index of first lens L1 is greater than 1.6. For example, the refractive index of first lens L1 can be any one of 1.65, 1.75, 1.80, 1.85, 1.90, or 2.0. To meet the refractive index requirements for first lens L1, first lens L1 can be made of glass. In some embodiments, first lens L1 can also be made of other composite materials with a refractive index within the range of 1.6 to 2.0.

[0100] Since the first lens L1 has a focusing effect and the refractive index of the first lens L1 is greater than 1.6, the first lens L1 has a strong ability to converge light. As the lens closest to the object side in the optical lens 10, the first lens L1 can play a good role in adjusting the light path. Compared with the lenses with a refractive index of about 1.55 in conventional technology, the refractive index of the first lens L1 in the embodiment of the present application is higher, so that the first lens L1 can have a smaller axial thickness while having good light converging ability, resulting in a thinner first lens L1 with strong aberration correction ability. The first lens L1 that meets the above refractive index can reduce the axial thickness of the first lens L1 while ensuring the imaging effect, thereby allowing the total optical length of the optical lens 10 to be shortened.

[0101] The sagittal height of a lens surface represents the distance between the projection point of any point on the lens surface on the optical axis and the center point of the lens surface. It can be understood that when the projection point of the point is on the image side of the lens surface, the sagittal height of the point is a positive number. Conversely, when the projection point of the point is on the object side of the lens surface, the sagittal height of the point is a negative number. Referring to Figure 3, the sagittal height at the edge of the image side surface of the third lens L3 is greater than 0.3mm, that is, the distance between the projection point of the edge of the image side surface of the third lens L3 on the optical axis and the center point of the image side surface of the third lens L3 is greater than 0.3mm, and the projection point of the edge of the image side surface of the third lens L3 on the optical axis is located on the image side of the image side surface of the third lens L3. The sagittal height at the edge of the object side surface of the third lens L3 is greater than zero, that is, the projection point of the edge of the object side surface of the third lens L3 on the optical axis is located on the image side of the object side surface of the third lens L3.

[0102] The sag height of the edge of the image-side surface of the third lens element L3 is greater than 0.3 mm. Specifically, the sag height of the edge of the image-side surface of the third lens element L3 can be within the range of 0.3 mm to 0.50 mm, such as 0.32 mm, 0.42 mm, 0.46 mm, or 0.48 mm. Combined with the fact that the sag height of the edge of the object-side surface of the third lens element L3 is greater than zero, the edge region of the third lens element L3 can be limited to being closer to the image side than the paraxial region of the third lens element L3. With this shape, the third lens element L3 can have excellent light converging ability. The edge of the third lens element L3 can adjust and correct the position of light, thereby improving image quality.

[0103] It should be noted that, regardless of whether the third lens L3 has positive or negative optical power, the third lens L3 has good light converging ability. Referring to Figures 4 and 5, Figure 4 shows a schematic structural diagram of the optical lens 10 provided in the first embodiment of the present application, and Figure 5 exemplarily illustrates the propagation path of the light in the optical lens 10 provided in the first embodiment through lines. Among them, the third lens L3 has positive optical power, and the third lens L3 can adjust the exit position and exit angle of the light, thereby correcting the position of the light. Referring to Figures 8 and 9, Figure 8 shows a schematic structural diagram of the optical lens 10 provided in the second embodiment of the present application, and Figure 9 exemplarily illustrates the propagation path of the light in the optical lens 10 provided in the second embodiment through lines, wherein the third lens L3 has negative optical power, and the third lens L3 can adjust the angle of the light, thereby adjusting or correcting the position of the light. 5 and 9 , since the edge region of the third lens L3 is closer to the image side than the paraxial region of the third lens L3, regardless of whether the third lens L3 has positive or negative power, the light on the image side of the third lens L3 is still more concentrated than the light on the object side of the third lens L3. The third lens L3 plays a role in converging the light, making the light more concentrated. The light can reach the desired position in the gap with a shorter distance, which is beneficial to shortening the gap between the third lens L3 and the fourth lens L4, thereby reducing the total optical length of the optical lens 10.

[0104] In the above embodiment, the optical lens 10 has excellent light converging capabilities. The first lens L1 can effectively adjust the optical path. While maintaining excellent light converging capabilities, it also has a small axial thickness, resulting in a thin first lens L1 with strong aberration correction capabilities. The third lens L3 further converges the light and adjusts the phase difference of the light, thereby ensuring that the optical lens 10 has excellent imaging capabilities while having a shorter overall optical length. This facilitates the placement of the optical lens 10, and particularly facilitates the thinning of the terminal 1000 when the optical lens 10 is placed in the terminal 1000.

[0105] In some embodiments, the optical lens 10 can be suitable for large aperture, that is, the optical lens 10 can be used in scenarios with a large amount of light entering. The amount of light entering the aperture is inversely correlated with the aperture value. The smaller the aperture value, the greater the amount of light entering the aperture. The large aperture here may refer to an aperture with an aperture value less than or equal to F / 2.8. For example, the aperture value may be F / 1.8, F / 1.6, F / 1.4, etc. When the optical lens 10 provided in this embodiment is used for photography with a large aperture, the amount of light entering the optical lens 10 is large, and the first lens L1 and the third lens L3 both have good focusing capabilities. Even if the total optical length of the optical lens 10 is small, it can still have a good focusing effect on the incoming light, so that the optical lens 10 has good imaging quality when photographing with a large aperture. The optical lens 10 provided in this application can be suitable for large apertures and maintain good imaging effects, thus having good application prospects.

[0106] The terminal 1000 using the optical lens 10 of the above embodiment can have a large aperture, a small depth of field, and high-quality imaging mode. For example, in an embodiment where the terminal 1000 is a mobile phone, the mobile phone can have a "portrait mode." In this mode, the optical lens 10 can capture images with a large aperture, a small depth of field, and high quality, thus providing the mobile phone with excellent imaging effects and enhancing the user experience.

[0107] It should be noted that the optical power and material of the other lenses not specified in the optical lens 10 described above are not limited. In actual applications, the optical properties of the other lenses can be adaptively adjusted according to the requirements of the optical lens 10. The lenses can be selectively made of plastic, glass, or other composite materials according to optical requirements. Plastic materials can easily produce optical lens structures with various complex shapes, but the range of refractive index options for plastic materials is relatively small. Optical lenses made of glass materials have a wider range of refractive index options, making it easier to obtain thinner but higher-performance glass lenses, but it is not easy to produce optical lens structures with complex shapes. In some embodiments, the lens of the optical lens 10 can also include two or more sub-lenses bonded together, and the materials of the two sub-lenses can be different. By selecting sub-lenses of different materials and bonding them together to form a lens, the Abbe number and refractive index of the lens can be adjusted, which is equivalent to further increasing the range of the refractive index and Abbe number of the lens, making it easier to obtain a thinner and higher-performance lens.

[0108] Based on this, in some embodiments of the present application, the specific application materials of different lenses are reasonably matched according to needs, taking into account production costs, efficiency, and optical effects. In some embodiments, of the at least seven lenses of the optical lens 10, the first lens L1 is made of glass, and the remaining lenses are made of resin materials. This ensures that the first lens L1 has a good focusing effect, and the remaining lenses are made of resin materials. This facilitates the production of complex optical lens structures, achieving different refractive treatments for light and meeting different optical requirements.

[0109] As shown in Figure 3, the back focal length BFL (Back Focal Length) of the optical lens 10 in the embodiment of the present application is the minimum distance between the image side surface of the seventh lens L7 of the optical lens 10 and the imaging surface (the photosensitive element 20 in Figure 3 overlaps with the imaging surface IMA). The total optical length TTL (Total Track Length) of the optical lens 10 is the maximum distance between the object side surface of the first lens L1 and the imaging surface on the optical axis. The optical body length TTL1 of the optical lens 10, that is, the maximum distance between the object side surface of the first lens L1 and the image side surface of the seventh lens L7 on the optical axis, it is understandable that TTL1 is the main factor forming the height of the optical lens 10 along the optical axis direction. The BFL, TTL, and TTL1 appearing in various positions of the present application all have the same meaning and will not be repeated in subsequent occurrences.

[0110] In some embodiments, the back focal length (BFL) of the optical lens 10 and the total optical length (TTL) of the optical lens 10 can satisfy the relationship of 4 ≤ TTL / BFL ≤ 7. The ratio of the total optical length (TTL) to the back focal length (BFL) of conventional optical systems is typically greater than 10, meaning that conventional lens designs have a larger TTL and a smaller BFL. In the embodiments of the present application, the ratio between the total optical length (TTL) and the back focal length (BFL) satisfies the aforementioned relationship, allowing the back focal length (BFL) to account for a larger proportion of the total optical length (TTL) of the optical lens 10, resulting in the optical lens 10 having a larger back focal length (BFL) than conventional optical lenses. In large-aperture shooting scenarios, the optical lens has a large light intake range and a large amount of light, requiring a longer light processing path and a larger back focal length (BFL) to achieve convergent imaging. The optical lens 10 in the embodiments of the present application has a larger back focal length (BFL), which can provide a longer convergent path for light, meeting the light convergence path requirements in large-aperture scenarios. This allows the optical lens 10 to achieve better imaging results when using a larger aperture, reducing imaging issues such as out-of-focus, blur, or distortion. Furthermore, the optical lens 10 in this embodiment has a shorter optical body length TTL1 than a conventional optical lens, which can facilitate the arrangement of the optical lens 10 and help achieve a thinner terminal where the optical lens 10 is arranged.

[0111] The optical lens 10 in the above embodiment has a larger back focal length BFL, and the gap between the image side surface of the seventh lens L7 and the imaging surface is large, which also allows the optical lens 10 to be suitable for a pop-up camera module 100. Specifically, when the pop-up camera module 100 is in the working state, the back focal length BFL of the optical lens 10 is large, which can reserve sufficient gap so that light can form a clear image on the imaging surface, so that the optical lens 10 has good imaging quality. The gap between the image side surface of the seventh lens L7 and the imaging surface can also reserve space for the movement of the optical lens 10. When the camera module 100 is switched to the non-working state, the optical lens 10 can move at least part of the distance toward the inside of the housing, thereby reducing the gap between the optical lens and the photosensitive element 20 to reduce the height of the optical lens 10 protruding from the terminal 1000, which is conducive to achieving a thin design of the terminal 1000 using the camera module 100.

[0112] Based on the above description, it can be seen that the optical lens 10 of the embodiment of the present application has a relatively long back focal length when the camera module 100 is in the pop-up state, thereby facilitating the focusing or zooming operation of the camera module 100, and helping the camera module 100 to achieve better shooting effects. At the same time, the optical lens 10 can also adopt a variable aperture structural design, which can provide different depth of field ranges for different scenes, thereby taking into account the shooting requirements of multiple scenes. In addition, the optical lens 10 is combined with a photosensitive element with a large target surface to achieve better optical quality, thereby helping to improve the imaging quality of the camera module 100.

[0113] In some embodiments, the ratio of the focal length f1 of the first lens L1 in the optical lens system 10 to the system focal length f of the optical lens system 10 satisfies the relationship f1 / f≤1. For example, the ratio of the focal length f1 of the first lens L1 to the system focal length f can be 0.8 or 0.9. It is understood that the first lens L1 has positive refractive power, and the ratio of the focal length f1 of the first lens L1 to the system focal length f of the optical lens system 10 is greater than zero. In the optical lens system 10 that satisfies the above relationship, the focal length f1 of the first lens L1 is greater than zero and less than the system focal length f. This effectively controls the focal length range of the first lens L1, enabling the first lens L1 to perform an effective focusing function and ensuring that the system can better converge light. Furthermore, by controlling the focal length of the first lens L1 in this embodiment, light emitted from the image-side surface of the first lens L1 has good focusing properties. The second lens L2 can be positioned closer to the first lens L1, thereby reducing the gap between the first lens L1 and the second lens L2, which helps to reduce the total optical length (TTL) of the optical lens system 10.

[0114] In some embodiments, the ratio of the focal length f2 of the second lens L2 to the system focal length f of the optical lens 10 satisfies the relationship -2≤f2 / f≤0. For example, the ratio of the focal length f2 of the second lens L2 to the system focal length f can be -1.30, -1.34, -1.4, or -1.46. It is understood that when the ratio of the focal length f2 of the second lens L2 to the system focal length f of the optical lens 10 is less than zero, it can be seen that the second lens L2 has negative optical power, that is, it has the effect of diverging light. When the ratio of the focal length f2 of the second lens L2 to the system focal length f of the optical lens 10 is greater than -2, and the range of the focal length f2 of the second lens L2 is such that the second lens L2 can effectively control the propagation direction of light.

[0115] The side surfaces of each lens in the embodiments of the present application can be spherical or aspherical. Generally speaking, if the center of curvature of any point on the side surface of a lens is located on the image side of the tangent line to that point, the radius of curvature at that point is positive. If the center of curvature of any point on the side surface of a lens is located on the object side of the tangent line to that point, the radius of curvature at that point is negative. Referring to Figure 3, in some embodiments, the radius of curvature of the center of the image side surface of the third lens L3 is less than zero, i.e., the center of the image side surface of the third lens L3 is concave toward the object side.

[0116] In some embodiments, the paraxial region of the sixth lens element L6 has positive optical power. It should be noted that the paraxial region refers to a region on a lens with ideal optical properties. Within this region, the actual optical path calculated for the lens is identical to the ideal optical path calculated using the Gaussian formula. This region is typically located near the optical center of the lens. The paraxial region of the sixth lens element L6 has positive optical power. This positive optical power of the sixth lens element L6 has a light converging effect in the paraxial region, facilitating convergent light and imaging.

[0117] In the above embodiment, the refractive properties of the edge area of ​​the sixth lens L6 for light can be convergent or divergent, and the refractive properties of the edge area of ​​the sixth lens L6 can be adaptively adjusted according to the imaging effect of the optical lens 10, which helps to improve the image quality of the edge field of view of the camera module 100.

[0118] In some embodiments, the radius of curvature of the center of the image-side surface of the sixth lens L6 is less than 0, that is, the shape of the center of the image-side surface of the sixth lens L6 is convex. The sixth lens L6 can effectively control the direction of light in the paraxial region, and adjust the position at which the light is incident on the seventh lens L7 while converging the light, so as to correct phase aberration and achieve better imaging effects.

[0119] In some embodiments, the paraxial region of seventh lens element L7 has negative power, diverging light. In some embodiments, the radius of curvature at the center of the object-side surface of seventh lens element L7 is less than 0, and the object-side surface of seventh lens element L7 is concave. This allows seventh lens L7 to effectively control the direction of light within the internal field of view. Combined with the negative power of seventh lens element L7, this allows it to simultaneously diverge light and adjust the position of light exit, resulting in a well-converged image on the imaging surface.

[0120] In the above embodiment, the refractive properties of the seventh lens L7 for light can be convergent or divergent, and the refractive properties of the edge area of ​​the seventh lens L7 can be adaptively adjusted according to the imaging effect of the optical lens 10, which helps to improve the image quality of the edge field of view of the camera module 100.

[0121] The sixth lens L6 and the seventh lens L7 can also cooperate to correct system spherical aberration, reduce distortion of the peripheral field of view, and correct astigmatism, thereby improving the imaging quality of the optical lens 10.

[0122] In some embodiments, the center of the image-side surface of the sixth lens L6 is convex, and the center of the object-side surface of the seventh lens L7 is concave. As shown in FIG3 , the center of the image-side surface of the sixth lens L6 and the center of the object-side surface of the seventh lens L7 have good shape adaptability, which can reduce the possibility of positional interference between the sixth lens L6 and the seventh lens L7. The relative position arrangement of the sixth lens L6 and the seventh lens L7 can be more flexible, which makes it easier to achieve an arrangement with a small gap between the sixth lens L6 and the seventh lens L7, thereby facilitating a reduction in the length of the optical body of the optical lens 10.

[0123] In some embodiments, the system focal length f of the optical lens 10 and the entrance pupil diameter EPD of the optical lens 10 may satisfy the relationship f / EPD≤1.55. The aperture value is equal to the ratio of the system focal length of the optical lens 10 to the entrance pupil diameter EPD of the optical lens 10. If the aperture value of the optical lens 10 that satisfies the above relationship is less than 1.55, that is, the entrance pupil diameter EPD of the optical lens 10 is large, the optical lens 10 can allow a greater amount of light to enter, and the depth of field of the camera can be shallower. The focus point within the depth of field is clear, while other scenes outside the depth of field are blurred, thereby better highlighting the subject and streamlining the image.

[0124] It is understandable that the optical lens 10 provided in the embodiment of the present application is not only applicable to large aperture, but also that large aperture photography is only an optional working mode thereof. In some embodiments, the optical lens 10 can be provided with an aperture STO, where the aperture STO is specifically an aperture aperture. The aperture value can be adjusted by changing the light-passing diameter of the aperture STO. Different light-passing diameters correspond to different aperture values, that is, to different depths of field, so that the optical lens 10 can be adapted to different shooting scenes. For example, the optical lens 10 can reduce the aperture value in a dark environment to increase the amount of light entering and enhance the image quality. In a bright environment, the optical lens 10 can increase the aperture value to reduce the amount of light entering to avoid overexposure affecting the imaging effect.

[0125] Moreover, when the aperture STO has a large light-transmitting diameter, the aperture value of the optical lens 10 is relatively small, and it has a large aperture characteristic, so the depth of field can be shallowed and the focus point can be clear, while other scenes outside the depth of field range will be blurred, thereby better highlighting the subject and streamlining the picture. In addition, the use of a large aperture also means that the amount of light entering the optical lens 10 per unit time will increase. When the exposure of the picture remains unchanged, the shutter speed can be increased in the large aperture mode. When handheld shooting in insufficient light or dark environments, the increase in shutter speed can reduce the impact of hand shaking on picture clarity, which is conducive to the camera module 100 taking better night scene pictures. When the aperture STO has a small light-transmitting diameter, the aperture value of the optical lens 10 is relatively large, and it has a small aperture characteristic, so that a large depth of field can be obtained, so that the background or foreground outside the focused subject can also remain clear. In addition, the small aperture can reduce the amount of light entering the optical lens 10, which can slow down the shutter speed, thereby helping to make moving objects leave motion traces on the screen. Therefore, the optical lens 10 can also capture scenes such as flowing water, car tracks, star trails, and light painting in the small aperture mode.

[0126] In an embodiment employing a variable aperture, the entrance pupil diameter EPD is equal to the ratio of the focal length of the optical system to the aperture value, EPDmax is the maximum entrance pupil diameter of the optical lens 10, and EPDmin is the minimum entrance pupil diameter of the optical lens 10. It is understood that the entrance pupil diameter EPD varies with the aperture value of the variable aperture. When the aperture value of the variable aperture is the minimum aperture value within the variable range, the entrance pupil diameter corresponding to the minimum aperture value is the maximum entrance pupil diameter EPDmax; when the aperture value of the variable aperture is the maximum aperture value within the variable range, the entrance pupil diameter corresponding to the maximum aperture value is the minimum entrance pupil diameter EPDmin. In some embodiments, the optical lens 10 can satisfy the relationship f / (EPDmax-EPDmin)≥1.6. The aperture value of the optical lens 10 that satisfies the above relationship can be adjusted. Within the adjustable range of the aperture value, the optical system 10 can provide different depths of field ranges for different scenes by adjusting to different aperture values, thereby meeting the shooting requirements of multiple scenes.

[0127] The field of view (FOV) of the optical lens 10 determines its field of view. The semi-FOV (half FOV) is half the FOV. In some embodiments, the maximum semi-FOV (semi-FOV) of the optical lens 10 can be less than or equal to 43°. Within this range, the optical lens 10 can effectively control the range of the system's shooting angle of view, minimizing optical distortion when used as a primary camera, and achieving good imaging results.

[0128] It can be understood that there is a geometric correspondence between the system focal length f of the optical lens 10, the maximum half field of view Semi-FOV of the optical lens 10, and the target surface of the photosensitive element 20. In some embodiments, the system focal length f of the optical lens 10 and the maximum half field of view Semi-FOV of the optical lens 10 satisfy the relationship f×tan(Semi-FOV)≥7.5mm. The camera module 100 in this embodiment has a larger target surface, which is beneficial to improving imaging brightness and resolution.

[0129] In some embodiments, the system focal length f of the optical lens 10 and the maximum half field of view Semi-FOV of the optical lens 10 satisfy the relationship of f×tan(Semi-FOV)≥8 mm.

[0130] The optical lens 10 in the embodiment of the present application can achieve a balance between a large aperture, a large target surface, and a system height, that is, the system focal length f of the optical lens 10 and the entrance pupil diameter EPD of the optical lens 10 can satisfy the relationship of f / EPD≤1.55, and the system focal length f of the optical lens 10 and the maximum half field of view Semi-FOV of the optical lens 10 satisfy the relationship of f×tan(Semi-FOV)≥7.5mm. The optical lens 10 in this embodiment uses a large aperture and a large target surface. Based on the large refractive index of the first lens L1 of the optical lens 10, a first lens L1 with good focusing performance and a small thickness can be obtained. The third lens L3 can further converge the light and adjust the aberration of the light. The optical lens 10 in this embodiment can have good light converging ability, and can ensure that the optical lens 10 has good imaging ability when applied to a large aperture and a large target surface. At the same time, the optical lens 10 has a smaller total optical length. The optical lens 10 is easier to arrange, especially when the optical lens 10 is arranged in the terminal 1000, it can help to achieve a thinner terminal 1000.

[0131] By combining the relationship formulas provided in the above different embodiments, multiple specific embodiments of the present application can be obtained. The imaging effect of the optical lens 10 is described in detail below in conjunction with specific embodiments.

[0132] As shown in FIG4 , in the first embodiment of the present application, arranged in order from the object side to the image side are an aperture stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with negative refractive power, an infrared filter IR, and an imaging surface IMA. Specific design parameters for the first embodiment are as follows.

[0133] The sag of the edge of the image-side surface of the third lens L3 satisfies: sag = 0.48 mm;

[0134] The system focal length f of the optical lens 10 and the entrance pupil diameter EPD of the optical lens 10 satisfy: f / EPD=1.51;

[0135] The curvature radius R12 of the image-side surface of the sixth lens L6 satisfies: R12=-3.03;

[0136] The system focal length f of the optical lens 10 and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin of the optical lens 10 satisfy: f / (EPDmax-EPDmin)=2.44;

[0137] The system focal length f of the optical lens 10 and the maximum half field angle Semi-FOV of the optical lens 10 satisfy: f×tan(Semi-FOV)=8.235;

[0138] The maximum half field of view angle Semi-FOV of the optical lens 10 satisfies: Semi-FOV=41.26°;

[0139] The focal length f1 of the first lens L1 and the system focal length f of the optical lens 10 satisfy: f1 / f=0.825;

[0140] The focal length f2 of the second lens L2 and the system focal length f of the optical lens 10 satisfy: f2 / f=-1.452.

[0141] Based on the design parameters of the first embodiment, basic parameters of the optical lens 10 in the first embodiment are shown in Table 1A below.

[0142] Table 1A: Basic parameters of the optical lens in the first embodiment

[0143] In Table 1A, the maximum image height IH is specifically the diagonal length of the effective pixel area of ​​the imaging surface of the optical lens 10, that is, it represents the diagonal length of the effective pixel area on the photosensitive element 20.

[0144] Based on the design parameters of the first embodiment, the radius of curvature, thickness, refractive index and Abbe coefficient of each lens in the optical lens 10 in the first embodiment are shown in Table 1B below, where thickness refers to the distance from one surface to the next surface along the optical axis, and the Abbe coefficient of a lens is also called the dispersion coefficient, which is the degree of dispersion of an optical material at different wavelengths.

[0145] Table 1B. Curvature radius, thickness, refractive index and Abbe coefficient of each lens in the optical lens.

[0146] In Table 1B above, STO represents the aperture, L1 represents the first lens element, L2 represents the second lens element, L3 represents the third lens element, L4 represents the fourth lens element, L5 represents the fifth lens element, L6 represents the sixth lens element, L7 represents the seventh lens element, and IR represents the infrared filter. S1 represents the object-side surface of the lens; S2 represents the image-side surface of the lens. IMA represents the imaging surface.

[0147] Based on the design parameters of the first embodiment, the conic coefficients and aspheric coefficients of the lenses in the optical lens 10 of the first embodiment are shown in Table 1C below.

[0148] Table 1C. Conic coefficients and aspheric coefficients of each lens in the optical lens.

[0149] In the above Table 1C, STO represents the aperture; L1 represents the first lens; L2 represents the second lens; L3 represents the third lens; L4 represents the fourth lens; L5 represents the fifth lens; L6 represents the sixth lens; L7 represents the seventh lens; S1 represents the object side surface of the lens; S2 represents the image side surface of the lens; Ai represents the i-th order aspheric coefficient, such as A2 represents the 2nd order aspheric coefficient.

[0150] As shown in Table 1C, the first lens L1 to the seventh lens L7 include a total of 14 aspheric surfaces. Based on the conic coefficient K and the i-th order aspheric coefficient Ai provided in Table 1C, the aspheric surface shape of each lens in the first embodiment can be obtained.

[0151] In some embodiments, all even-order aspheric surface types z can be defined using, but not limited to, the following aspheric formula:

[0152] Among them, z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0153] FIG4 shows a schematic structural diagram of the optical lens 10 provided in the first embodiment, wherein the schematic structural diagram of the optical lens 10 is a simulation image obtained by the above-mentioned aspheric formula.

[0154] FIG5 is a schematic structural diagram of the optical lens 10 provided in the first embodiment, wherein lines are used to exemplarily illustrate the light propagation path in the optical lens 10. It should be noted that the illustrated light propagation path is a light propagation path simulated under ideal conditions and is provided only as a reference to assist in understanding the performance of the optical lens 10. It does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0155] Figure 6 shows a graph of axial chromatic aberration for the optical lens 10 provided in the first embodiment. Specifically, Figure 6 shows the axial chromatic aberration curves, also known as spherical aberration curves, for light at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the optical lens 10 provided in the first embodiment. The ordinate represents the normalized pupil coordinate, and the abscissa represents the axial chromatic aberration, with the unit of chromatic aberration being millimeters. As shown in Figure 6 , the axial chromatic aberration for each wavelength in the first embodiment can be controlled within a very small range.

[0156] Figure 7 shows an optical distortion curve for the optical lens 10 provided in the first embodiment. This curve shows the optical distortion of light with a wavelength of 555 nm after passing through the optical lens 10 of the first embodiment, indicating the difference between the actual shape of the light after passing through the optical lens 10 and the ideal shape. The ordinate represents image height, and the abscissa represents the distortion value, which is specifically the ratio (in percentage) between the actual shape and the ideal shape. As shown in Figure 7 , the optical lens 10 in the first embodiment is capable of controlling optical distortion within 3%, a range that is difficult to discern with the naked eye. This means that the optical lens 10 is capable of producing high-quality imaging results.

[0157] Thus, in the first embodiment, the various lenses of the optical lens system 10 perform different refractive functions and cooperate with each other, resulting in an optical lens system 10 having good imaging quality and a shorter total optical length. Specifically, the first lens L1 has a good light-gathering effect and a relatively small axial thickness, the second lens L2 can adjust the light, the third lens L3 can effectively converge the light, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 can effectively correct system spherical aberration, reduce distortion of the peripheral field of view, and correct astigmatism. The sixth lens L6 and the seventh lens L7 have a smaller gap, thereby enabling the optical lens system 10 to achieve good imaging effects. The total optical length (TTL) of the optical lens system 10 is 11.421 mm. The short total optical length of the optical lens system 10 requires less space on the terminal 1000 for placement, facilitating a thinner terminal 1000.

[0158] As shown in FIG8 , in the second embodiment of the present application, arranged in order from the object side to the image side are an aperture stop STO, a first lens element L1 with positive optical power, a second lens element L2 with negative optical power, a third lens element L3 with negative optical power, a fourth lens element L4 with positive optical power, a fifth lens element L5 with negative optical power, a sixth lens element L6 with positive optical power, a seventh lens element L7 with negative optical power, an infrared filter IR, and an imaging surface IMA. The specific design parameters of the second embodiment are as follows. The meanings of the various parameters refer to the relevant descriptions of the first embodiment.

[0159] The sag of the edge of the image-side surface of the third lens L3 satisfies: sag = 0.46 mm;

[0160] The system focal length f of the optical lens 10 and the entrance pupil diameter EPD of the optical lens 10 satisfy: f / EPD=1.52;

[0161] The curvature radius R12 of the image-side surface of the sixth lens L6 satisfies: R12=-2.93;

[0162] The system focal length f of the optical lens 10 and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin of the optical lens 10 satisfy: f / (EPDmax-EPDmin)=2.46;

[0163] The system focal length f of the optical lens 10 and the maximum half field angle Semi-FOV of the optical lens 10 satisfy: f×tan(Semi-FOV)=8.22;

[0164] The maximum half field of view angle Semi-FOV of the optical lens 10 satisfies: Semi-FOV=41.2°;

[0165] The focal length f1 of the first lens L1 and the system focal length f of the optical lens 10 satisfy: f1 / f=0.825;

[0166] The focal length f2 of the second lens L2 and the system focal length f of the optical lens 10 satisfy: f2 / f=-1.461.

[0167] Based on the design parameters of the second embodiment, basic parameters of the optical lens 10 in the second embodiment are shown in Table 2A below.

[0168] Table 2A: Basic parameters of the optical lens in the second embodiment

[0169] Based on the design parameters of the second embodiment, the curvature radius, thickness, refractive index and Abbe coefficient of each lens in the optical lens 10 in the second embodiment are shown in Table 2B below.

[0170] Table 2B. Curvature radius, thickness, refractive index and Abbe coefficient of each lens in the optical lens.

[0171] Based on the design parameters of the second embodiment, the conic coefficient and aspheric coefficient of each lens in the optical lens 10 of the second embodiment are shown in Table 2C below.

[0172] Table 2C. Conic coefficients and aspheric coefficients of each lens in the optical lens.

[0173] As shown in Table 2C, the first lens L1 to the seventh lens L7 include a total of 14 aspheric surfaces. Based on the conic coefficient K and the i-th order aspheric coefficient Ai provided in Table 2C, the aspheric surface shape of each lens in the second embodiment can be obtained.

[0174] In some embodiments, all even-order aspheric surface types z can be defined using, but not limited to, the following aspheric formula:

[0175] Among them, z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0176] FIG8 shows a schematic structural diagram of the optical lens 10 provided in the second embodiment, wherein the schematic structural diagram of the optical lens 10 is a simulation image obtained by the above-mentioned aspheric formula.

[0177] FIG9 is a schematic structural diagram of the optical lens 10 provided in the second embodiment, in which lines are used to exemplarily illustrate the light propagation path in the optical lens 10. It should be noted that the illustrated light propagation path is a light propagation path simulated under ideal conditions and is provided only as a reference to assist in understanding the performance of the optical lens 10. It does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0178] Figure 10 shows a graph of axial chromatic aberration for the optical lens 10 provided in the second embodiment. Specifically, Figure 10 illustrates the axial chromatic aberration curves for light at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the optical lens 10 provided in the second embodiment. The ordinate represents the normalized pupil coordinate, and the abscissa represents the axial chromatic aberration, with the unit of chromatic aberration being millimeters. As shown in Figure 10 , the axial chromatic aberration for each wavelength in the second embodiment can be controlled within a very small range.

[0179] FIG11 shows an optical distortion curve of the optical lens 10 provided in the second embodiment, wherein the optical distortion curve of light having a wavelength of 555 nm after passing through the optical lens 10 of the second embodiment is shown, which is used to represent the difference between the actual shape and the ideal shape of the light after passing through the optical lens 10. The ordinate represents the incident angle of the light. It can be understood that there is a corresponding conversion relationship between the incident angle and the image height, and the ordinate of the optical distortion curve can be selected from the incident angle or the image height; the abscissa represents the distortion value, which is specifically the ratio between the actual shape and the ideal shape (percentage value, unit is %). Referring to FIG11 , the optical lens 10 in the second embodiment can control the optical distortion within 3%. The optical distortion within this range is difficult to discern with the naked eye, that is, the optical lens 10 can achieve a high-quality imaging effect.

[0180] Thus, in the second embodiment, the various lenses of the optical lens 10 perform different refractive functions and cooperate with each other, resulting in an optical lens 10 with good imaging quality and a shorter total optical length. Specifically, the first lens L1 has an excellent light-gathering effect and a relatively small axial thickness, the second lens L2 can adjust the light, the third lens L3 can effectively converge the light, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 can effectively correct system spherical aberration, reduce distortion of the peripheral field of view, and correct astigmatism. A smaller gap is provided between the sixth lens L6 and the seventh lens L7, thereby enabling the optical lens 10 to achieve good imaging effects. The total optical length (TTL) of the optical lens 10 is controlled at 11.44 mm. The short total optical length of the optical lens 10 requires less space on the terminal 1000 for placement, facilitating a thinner terminal 1000.

[0181] As shown in FIG12 , in the third embodiment of the present application, arranged in order from the object side to the image side are an aperture stop STO, a first lens element L1 with positive optical power, a second lens element L2 with negative optical power, a third lens element L3 with positive optical power, a fourth lens element L4 with positive optical power, a fifth lens element L5 with negative optical power, a sixth lens element L6 with positive optical power, a seventh lens element L7 with negative optical power, an infrared filter IR, and an image-sensing surface IMA. The specific design parameters of the third embodiment are as follows. For the meaning of each parameter, refer to the relevant description of the first embodiment.

[0182] The sag of the edge of the image-side surface of the third lens L3 satisfies: sag = 0.412 mm;

[0183] The system focal length f of the optical lens 10 and the entrance pupil diameter EPD of the optical lens 10 satisfy: f / EPD=1.48;

[0184] The curvature radius R12 of the image-side surface of the sixth lens L6 satisfies: R12=-3.31;

[0185] The system focal length f of the optical lens 10 and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin of the optical lens 10 satisfy: f / (EPDmax-EPDmin)=2.35;

[0186] The system focal length f of the optical lens 10 and the maximum half field angle Semi-FOV of the optical lens 10 satisfy: f×tan(Semi-FOV)=8.08;

[0187] The maximum half field of view angle Semi-FOV of the optical lens 10 satisfies: Semi-FOV=41.17°;

[0188] The focal length f1 of the first lens L1 and the system focal length f of the optical lens 10 satisfy: f1 / f=0.8345;

[0189] The focal length f2 of the second lens L2 and the system focal length f of the optical lens 10 satisfy: f2 / f=-1.3464.

[0190] Based on the design parameters of the third embodiment, basic parameters of the optical lens 10 in the third embodiment are shown in Table 3A below.

[0191] Table 3A: Basic parameters of the optical lens in the third embodiment

[0192] Based on the design parameters of the third embodiment, the curvature radius, thickness, refractive index and Abbe coefficient of each lens in the optical lens 10 in the third embodiment are shown in Table 3B below.

[0193] Table 3B. Curvature radius, thickness, refractive index and Abbe coefficient of each lens in the optical lens.

[0194] Based on the design parameters of the third embodiment, the conic coefficient and aspheric coefficient of each lens in the optical lens 10 in the third embodiment are shown in Table 3C below.

[0195] Table 3C. Conic coefficients and aspheric coefficients of each lens in the optical lens.

[0196] As shown in Table 3C, the first lens L1 to the seventh lens L7 include a total of 14 aspheric surfaces. Based on the conic coefficient K and the i-th order aspheric coefficient Ai provided in Table 3C, the aspheric surface shape of each lens in the third embodiment can be obtained.

[0197] In some embodiments, all even-order aspheric surface types z can be defined using, but not limited to, the following aspheric formula:

[0198] Among them, z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0199] FIG12 shows a schematic structural diagram of the optical lens 10 provided in the third embodiment, wherein the schematic structural diagram of the optical lens 10 is a simulation image obtained by the above-mentioned aspheric formula.

[0200] Figure 13 shows a schematic structural diagram of the optical lens 10 provided in the third embodiment, in which lines are used to exemplarily illustrate the light propagation path in the optical lens 10. It should be noted that the light propagation path shown in the figure is a light propagation path simulated under ideal conditions and is only provided for reference to assist in understanding the performance of the optical lens 10, and does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0201] Figure 14 shows a graph of axial chromatic aberration for the optical lens 10 provided in the third embodiment. Specifically, Figure 14 shows the axial chromatic aberration curves, also known as spherical aberration curves, for light of wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the optical lens 10 provided in the third embodiment. The ordinate represents the normalized pupil coordinate, and the abscissa represents the axial chromatic aberration, with the unit of chromatic aberration being millimeters. As shown in Figure 14 , the axial chromatic aberration for each wavelength in the third embodiment can be controlled within a very small range.

[0202] Figure 15 shows an optical distortion curve for the optical lens 10 provided in the third embodiment. This curve shows the optical distortion of light with a wavelength of 555 nm after passing through the optical lens 10 of the third embodiment, indicating the difference between the actual shape of the light and the ideal shape after passing through the optical lens 10. The ordinate represents the image height of the light, and the abscissa represents the distortion value, which is specifically the ratio (in percentage) between the actual shape and the ideal shape. Referring to Figure 15 , the optical lens 10 in the third embodiment is capable of controlling optical distortion within 3%, a range that is difficult to discern with the naked eye. This means that the optical lens 10 is capable of producing high-quality imaging results.

[0203] Thus, in the third embodiment, the various lenses of the optical lens system 10 perform different refractive functions and cooperate with each other, resulting in an optical lens system 10 having good imaging quality and a shorter total optical length. Specifically, the first lens L1 has a good light-gathering effect and a relatively small axial thickness, the second lens L2 can adjust the light, the third lens L3 can effectively converge the light, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 can effectively correct system spherical aberration, reduce distortion of the peripheral field of view, and correct astigmatism. The sixth lens L6 and the seventh lens L7 have a smaller gap, thereby enabling the optical lens system 10 to achieve good imaging effects. The total optical length (TTL) of the optical lens system 10 is controlled at 11.324 mm. The short total optical length of the optical lens system 10 requires less space on the terminal 1000 for placement, facilitating a thinner terminal 1000.

[0204] As shown in FIG16 , in the fourth embodiment of the present application, arranged in order from the object side to the image side are an aperture stop STO, a first lens element L1 with positive optical power, a second lens element L2 with negative optical power, a third lens element L3 with negative optical power, a fourth lens element L4 with positive optical power, a fifth lens element L5 with negative optical power, a sixth lens element L6 with positive optical power, a seventh lens element L7 with negative optical power, an infrared filter IR, and an imaging surface IMA. The specific design parameters of the fourth embodiment are as follows. The meanings of the various parameters refer to the relevant descriptions in the first embodiment.

[0205] The sag of the edge of the image-side surface of the third lens L3 satisfies: sag = 0.462 mm;

[0206] The system focal length f of the optical lens 10 and the entrance pupil diameter EPD of the optical lens 10 satisfy: f / EPD=1.485;

[0207] The curvature radius R12 of the image-side surface of the sixth lens L6 satisfies: R12=-2.945;

[0208] The system focal length f of the optical lens 10 and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin of the optical lens 10 satisfy: f / (EPDmax-EPDmin)=2.46;

[0209] The system focal length f of the optical lens 10 and the maximum half field angle Semi-FOV of the optical lens 10 satisfy: f×tan(Semi-FOV)=8.22;

[0210] The maximum half field of view angle Semi-FOV of the optical lens 10 satisfies: Semi-FOV=41.2°;

[0211] The focal length f1 of the first lens L1 and the system focal length f of the optical lens 10 satisfy: f1 / f=0.825;

[0212] The focal length f2 of the second lens L2 and the system focal length f of the optical lens 10 satisfy: f2 / f=-1.461.

[0213] Based on the design parameters of the fourth embodiment, basic parameters of the optical lens 10 in the fourth embodiment are shown in Table 4A below.

[0214] Table 4A: Basic parameters of the optical lens in the fourth embodiment

[0215] Based on the design parameters of the fourth embodiment, the curvature radius, thickness, refractive index and Abbe coefficient of each lens in the optical lens 10 in the fourth embodiment are shown in Table 4B below.

[0216] Table 4B. Curvature radius, thickness, refractive index and Abbe coefficient of each lens in the optical lens.

[0217] Based on the design parameters of the fourth embodiment, the conic coefficient and aspheric coefficient of each lens in the optical lens 10 of the fourth embodiment are shown in Table 4C below.

[0218] Table 4C. Conic coefficients and aspheric coefficients of each lens in the optical lens.

[0219] As shown in Table 4C, the first lens L1 to the seventh lens L7 include a total of 14 aspheric surfaces. Based on the conic coefficient K and the i-th order aspheric coefficient Ai provided in Table 4C, the aspheric surface shape of each lens in the fourth embodiment can be obtained.

[0220] In some embodiments, all even-order aspheric surface types z can be defined using, but not limited to, the following aspheric formula:

[0221] Among them, z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0222] FIG16 shows a schematic structural diagram of the optical lens 10 provided in the fourth embodiment, wherein the schematic structural diagram of the optical lens 10 is a simulation image obtained by the above-mentioned aspheric formula.

[0223] Figure 17 shows a schematic structural diagram of the optical lens 10 provided in the fourth embodiment, in which lines are used to exemplarily illustrate the light propagation path in the optical lens 10. It should be noted that the illustrated light propagation path is a light propagation path simulated under ideal conditions and is provided only as a reference to assist in understanding the performance of the optical lens 10, and does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0224] Figure 18 shows a graph of axial chromatic aberration for the optical lens 10 provided in the fourth embodiment. Specifically, Figure 18 illustrates the axial chromatic aberration curves for light at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the optical lens 10 provided in the fourth embodiment. The ordinate represents the normalized pupil coordinate, and the abscissa represents the axial chromatic aberration, with the unit of chromatic aberration being millimeters. As shown in Figure 18 , the axial chromatic aberration for each wavelength in the fourth embodiment can be controlled within a very small range.

[0225] FIG19 shows an optical distortion curve of the optical lens 10 provided in the fourth embodiment, wherein an optical distortion curve of light having a wavelength of 555 nm after passing through the optical lens 10 of the fourth embodiment is shown, which is used to represent the difference between the actual shape and the ideal shape of the light after passing through the optical lens 10. The ordinate represents the angle of incidence of the light; the abscissa represents the distortion value, which is specifically the ratio (percentage value, in %) between the actual shape and the ideal shape. Referring to FIG19 , the optical lens 10 in the fourth embodiment can control the optical distortion within 3%. The optical distortion within this range is difficult to discern with the naked eye, that is, the optical lens 10 can achieve a high-quality imaging effect.

[0226] Thus, in the fourth embodiment, the various lenses of the optical lens system 10 perform different refractive functions and cooperate with each other, resulting in an optical lens system 10 with good imaging quality and a shorter total optical length. Specifically, the first lens L1 has an excellent light-gathering effect and a relatively small axial thickness. The second lens L2 can adjust the light. The third lens L3 can effectively converge the light. The fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 can effectively correct system spherical aberration, reduce distortion in the peripheral field of view, and correct astigmatism. A smaller gap is provided between the sixth lens L6 and the seventh lens L7, thereby enabling the optical lens system 10 to achieve good imaging effects. The total optical length (TTL) of the optical lens system 10 is controlled at 11.39 mm. The short total optical length of the optical lens system 10 requires less space on the terminal 1000 for placement, facilitating a thinner terminal 1000.

[0227] As shown in FIG20 , in the fifth embodiment of the present application, arranged in order from the object side to the image side are an aperture stop STO, a first lens element L1 with positive optical power, a second lens element L2 with negative optical power, a third lens element L3 with positive optical power, a fourth lens element L4 with positive optical power, a fifth lens element L5 with negative optical power, a sixth lens element L6 with positive optical power, a seventh lens element L7 with negative optical power, an infrared filter IR, and an image-sensing surface IMA. The specific design parameters of the fourth embodiment are as follows. The meanings of the various parameters refer to the relevant descriptions in the first embodiment.

[0228] The sag of the edge of the image-side surface of the third lens L3 satisfies: sag = 0.3248 mm;

[0229] The system focal length f of the optical lens 10 and the entrance pupil diameter EPD of the optical lens 10 satisfy: f / EPD=1.38;

[0230] The curvature radius R12 of the image-side surface of the sixth lens L6 satisfies: R12=-3.315;

[0231] The system focal length f of the optical lens 10 and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin of the optical lens 10 satisfy: f / (EPDmax-EPDmin)=2.285;

[0232] The system focal length f of the optical lens 10 and the maximum half field angle Semi-FOV of the optical lens 10 satisfy: f×tan(Semi-FOV)=7.806;

[0233] The maximum half field of view angle Semi-FOV of the optical lens 10 satisfies: Semi-FOV=40.56°;

[0234] The focal length f1 of the first lens L1 and the system focal length f of the optical lens 10 satisfy: f1 / f=0.837;

[0235] The focal length f2 of the second lens L2 and the system focal length f of the optical lens 10 satisfy: f2 / f=-1.468.

[0236] Based on the design parameters of the fifth embodiment, basic parameters of the optical lens 10 in the fifth embodiment are shown in Table 5A below.

[0237] Table 5A: Basic parameters of the optical lens in the fifth embodiment

[0238] Based on the design parameters of the fifth embodiment, the curvature radius, thickness, refractive index and Abbe coefficient of each lens in the optical lens 10 in the fifth embodiment are shown in Table 5B below.

[0239] Table 5B. Curvature radius, thickness, refractive index and Abbe coefficient of each lens in the optical lens.

[0240] Based on the design parameters of the fifth embodiment, the conic coefficient and aspheric coefficient of each lens in the optical lens 10 in the fifth embodiment are shown in Table 5C below.

[0241] Table 5C. Conic coefficients and aspheric coefficients of each lens in the optical lens.

[0242] As shown in Table 5C, the first lens L1 to the seventh lens L7 include a total of 14 aspheric surfaces. Based on the conic coefficient K and the i-th order aspheric coefficient Ai provided in Table 5C, the aspheric surface shape of each lens in the fifth embodiment can be obtained.

[0243] In some embodiments, all even-order aspheric surface types z can be defined using, but not limited to, the following aspheric formula:

[0244] Among them, z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0245] FIG20 shows a schematic structural diagram of the optical lens 10 provided in the fifth embodiment, wherein the schematic structural diagram of the optical lens 10 is a simulation image obtained by the above-mentioned aspheric formula.

[0246] Figure 21 shows a schematic structural diagram of the optical lens 10 provided in the fifth embodiment, in which lines are used to exemplarily illustrate the light propagation path in the optical lens 10. It should be noted that the light propagation path shown in the figure is a light propagation path simulated under ideal conditions and is only provided for reference to assist in understanding the performance of the optical lens 10, and does not constitute a limitation on the light propagation path of the optical lens 10 in actual applications.

[0247] FIG22 illustrates an axial chromatic aberration curve for the optical lens 10 provided in the fifth embodiment. Specifically, FIG22 shows the axial chromatic aberration curves, also known as spherical aberration curves, for light of wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the optical lens 10 provided in the fifth embodiment. The ordinate represents the normalized pupil coordinate, and the abscissa represents the axial chromatic aberration, with the unit of chromatic aberration being millimeters. Referring to FIG22 , the axial chromatic aberration at each wavelength in the fifth embodiment can be controlled within a very small range.

[0248] Figure 23 shows an optical distortion curve for the optical lens 10 provided in the fifth embodiment. This curve shows the optical distortion of light with a wavelength of 555 nm after passing through the optical lens 10 in the fifth embodiment. This curve represents the difference between the actual shape of the light after passing through the optical lens 10 and the ideal shape. The ordinate represents image height, and the abscissa represents the distortion value, which is specifically the ratio (in percentage) between the actual shape and the ideal shape. As shown in Figure 23 , the optical lens 10 in the fifth embodiment is capable of controlling optical distortion within 3%, a range that is difficult to discern with the naked eye. This indicates that the optical lens 10 is capable of producing high-quality imaging results.

[0249] Thus, in the fifth embodiment, the various lenses of the optical lens system 10 perform different refractive functions and cooperate with each other, resulting in an optical lens system 10 with good imaging quality and a shorter total optical length. Specifically, the first lens L1 has an excellent light-gathering effect and a relatively small axial thickness. The second lens L2 can adjust the light. The third lens L3 can effectively converge the light. The fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 can effectively correct system spherical aberration, reduce distortion in the peripheral field of view, and correct astigmatism. A smaller gap is provided between the sixth lens L6 and the seventh lens L7, thereby enabling the optical lens system 10 to achieve good imaging effects. The total optical length (TTL) of the optical lens system 10 is controlled at 10.82 mm. The short total optical length of the optical lens system 10 requires less space on the terminal 1000 for placement, facilitating a thinner terminal 1000.

[0250] The above are only some of the embodiments and implementations of this application. The scope of protection of this 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 (10), characterized in that: The optical lens (10) includes at least seven lenses (L), each of the lenses (L) includes an object-side surface facing the object side and an image-side surface facing the image side, and the at least seven lenses (L) include a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), and a seventh lens (L7) arranged in sequence from the object side to the image side, wherein: The first lens (L1) has positive optical power, a refractive index of the first lens (L1) is greater than or equal to 1.6, a sag at an edge of the image-side surface of the third lens (L3) is greater than 0.3 mm, and a sag at an edge of the object-side surface of the third lens (L3) is greater than zero.

2. The optical lens (10) according to claim 1, characterized in that The back focal length BFL of the optical lens (10) and the total optical length TTL of the optical lens (10) satisfy the following relationship: 4≤TTL / BFL≤7.

3. The optical lens (10) according to claim 1 or 2, characterized in that: The system focal length f of the optical lens (10) and the focal length f1 of the first lens (L1) satisfy the following relationship: f1 / f≤1.

4. The optical lens (10) according to any one of claims 1 to 3, characterized in that: The system focal length f of the optical lens (10) and the focal length f2 of the second lens (L2) satisfy the following relationship: -2≤f2 / f≤0.

5. The optical lens (10) according to any one of claims 1 to 4, characterized in that: The system focal length f of the optical lens (10), the maximum entrance pupil diameter EPDmax of the optical lens (10), and the minimum entrance pupil diameter EPDmin of the optical lens (10) satisfy the following relationship: f / (EPDmax-EPDmin)≥1.

6.

6. The optical lens (10) according to any one of claims 1 to 5, characterized in that: The system focal length f of the optical lens (10) and the entrance pupil diameter EPD of the optical lens (10) satisfy the following relationship: f / EPD≤1.

55.

7. The optical lens (10) according to any one of claims 1 to 6, characterized in that: The system focal length f of the optical lens (10) and the maximum half field of view angle Semi-FOV of the optical lens (10) satisfy the following relationship: f×tan(Semi-FOV)≥7.5mm.

8. The optical lens (10) according to any one of claims 1 to 7, characterized in that: The maximum half-field angle Semi-FOV of the optical lens (10) satisfies the following relationship: Semi-FOV≤43°.

9. The optical lens (10) according to any one of claims 1 to 8, characterized in that: The paraxial region of the sixth lens (L6) has positive optical power, and the curvature radius of the center of the image side surface of the sixth lens (L6) is less than 0.

10. The optical lens (10) according to any one of claims 1 to 9, characterized in that: The paraxial region of the seventh lens (L7) has negative optical power, and the curvature radius of the center of the object-side surface of the seventh lens (L7) is less than 0.

11. The optical lens (10) according to any one of claims 1 to 10, characterized in that: The first lens (L1) is made of glass material.

12. A camera module (100), characterized in that: The optical lens (10) comprises a photosensitive element (20) and any one of claims 1 to 11, wherein the photosensitive element (20) is located on the image side of the optical lens (10).

13. The camera module (100) according to claim 12, characterized in that: The camera module (100) has a first state and a second state, wherein in the first state, the distance between the seventh lens (L7) of the optical lens (10) and the photosensitive element (20) is a first distance, and in the second state, the distance between the seventh lens (L7) of the optical lens (10) and the photosensitive element (20) is a second distance; The second distance is greater than the first distance.

14. A terminal (1000), characterized in that The invention comprises an image processor (300) and a camera module (100) as claimed in claim 12 or 13, wherein the image processor (300) is communicatively connected to the camera module (100), the camera module (100) is used to acquire image data and input the image data into the image processor (300), and the image processor (300) is used to process the image data output therein.

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