Optical lens, camera module and terminal

Abstract

The invention relates to the technical field of lenses, and provides an optical lens, a camera module and a terminal. The optical lens comprises at least seven lenses, each lens comprises an object side face facing the object side and an image side face facing the image side, the at least seven lenses comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged in the direction from the object side to the image side, the first lens has positive focal power, the refractive index of the first lens is larger than or equal to 1.6, the rise of the edge of the image side face of the third lens is larger than 0.3 mm, and the rise of the edge of the object side face of the third lens is larger than zero. The optical lens can have a good light convergence capability, can ensure that the optical lens has a good imaging capability, enables the optical lens to have a smaller total optical length, and facilitates the miniaturization of the optical lens. When the optical lens is arranged on the terminal, the terminal can be thinned.

Description

Technical Field

[0001] This application relates to the technical field of lenses, and particularly relates to an optical lens, a camera module, and a terminal. Background Art

[0002] There is a general trend of miniaturization in portable terminals, and consumers' requirements for the imaging effect of portable terminals are also getting higher and higher. To meet the imaging needs, the thickness of the camera module is constantly increasing. The size of the camera module often becomes the main factor restricting the miniaturization development of mobile terminals. Especially when the camera module is equipped with a large aperture, a large amount of light enters the optical lens, and a longer light processing path is required, resulting in a larger size of the camera module. Therefore, how to balance the imaging quality and thickness size of the optical lens, and provide an optical lens that can be applied to a large aperture and has a smaller body length has become a problem to be solved in the industry and a key difficulty in the miniaturization development process of portable terminals. Summary of the Invention

[0003] Embodiments of this application provide an optical lens, a camera module, and a terminal to obtain an optical lens with good imaging effect and smaller optical body length, which is beneficial to the miniaturization development of the terminal.

[0004] In a first aspect, embodiments of this application provide an optical lens, which includes at least seven lenses. Each lens includes an object side surface facing the object side and an image side surface facing the image side. The at least seven lenses include 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 along the direction from the object side to the image side. Among them, the first lens has a positive optical power, the refractive index of the first lens is greater than or equal to 1.6, the sagittal height at the edge of the image side surface of the third lens is greater than 0.3 mm, and the sagittal height at the edge of the object side surface of the third lens is greater than zero.

[0005] It can be understood that the sagittal height of the 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 this point is on the image side of the lens surface, the sagittal height of this point is a positive number. And when the projection point of this point is on the object side of the lens surface, the sagittal height of this point is a negative number.

[0006] By using the first lens with a refractive index greater than or equal to 1.6, a first lens with good light-gathering performance and small thickness can be obtained. Moreover, the third lens with the above characteristics can further converge the light and adjust the aberration of the light. The optical lens in this embodiment can have good light-converging ability, can ensure good imaging ability of the optical lens while making the optical lens have a smaller optical body length, which is convenient for the layout of the optical lens. Especially when the optical lens is arranged in a terminal, it is beneficial to realize the miniaturization of the terminal.

[0007] In some possible embodiments, the first lens is made of glass. The refractive index of glass has a wider range of options, which can meet the refractive index requirements of the first lens.

[0008] In some possible embodiments, the remaining lenses except the first lens are all made of resin. Resin has the characteristics of being easy to mold and process, which can meet the refractive requirements of the lens and the ease of molding, facilitating the manufacture of the optical lens.

[0009] In some possible embodiments, 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. The optical lens that satisfies this relationship has a larger back focal length BFL and a smaller optical body length TTL1, enabling the optical lens to have a better imaging effect at a larger aperture.

[0010] The above embodiments also allow the optical lens to be applicable to a pop-up camera module. The larger back focal length BFL can reserve space for the movement of the optical lens. When the camera module switches to the non-operating state, the optical lens can move at least part of the distance towards the inside of the housing, thereby reducing the gap between the optical lens and the photosensitive element, reducing the height of the optical lens protruding from the terminal, and facilitating the thin design of the terminal using this camera module.

[0011] In some possible embodiments, 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 with a focal length satisfying the above relationship can play a good role in focusing light, ensuring that the optical lens can converge light better.

[0012] In some possible embodiments, 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 that satisfies the above relationship can effectively control the propagation direction of light.

[0013] In some possible embodiments, the paraxial region of the sixth lens has a positive optical power. The sixth lens has the effect of converging light in the paraxial region.

[0014] In some possible embodiments, the radius of curvature of the center of the image side of the sixth lens is less than 0, that is, the shape of the center of the image side of the sixth lens is convex, and the sixth lens can achieve good light focusing in the paraxial region.

[0015] In some possible embodiments, the paraxial region of the seventh lens has a negative optical power. In this embodiment, the paraxial region of the seventh lens has the effect of diverging light, adaptively adjusting the direction of light in the paraxial region of the seventh lens, and improving the imaging quality.

[0016] In some possible embodiments, the radius of curvature of the center of the object side surface of the seventh lens is less than 0. The center of the object side surface of the seventh lens with the radius of curvature satisfying the above relationship is a concave surface, which can effectively control the light path in the paraxial region. In combination with the property that the seventh lens has a negative optical power, it can adjust the light exit position while diverging the light, so that the light can achieve good converging imaging on the imaging surface.

[0017] In some possible embodiments, the system focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens may satisfy the following relational formula: f / EPD ≤ 1.55. It can be 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. The aperture value of the optical lens satisfying the above relational formula is less than 1.55, and the optical lens has a large aperture photography mode, which can better highlight the main body and streamline the picture.

[0018] In some possible embodiments, the optical lens may satisfy the relational formula: f / (EPDmax - EPDmin) ≥ 1.6. Wherein, EPDmax is the maximum entrance pupil diameter of the optical lens, and EPDmin is the minimum entrance pupil diameter of the optical lens. The optical lens satisfying the above relational formula has a variable aperture. Within the above adjustable aperture range, the optical lens can provide different depth-of-field ranges for different scenes and take into account the shooting requirements of multiple scenes.

[0019] In some possible embodiments, the maximum semi-field of view Semi-FOV (Semi Field of View) of the optical lens is less than or equal to 43°. The optical distortion of the optical lens in this embodiment is smaller when used as the main camera lens, and it can have a good imaging effect.

[0020] In some possible embodiments, the system focal length f of the optical lens and the maximum semi-field of view Semi-FOV of the optical lens satisfy the following relational formula: f × tan(Semi-FOV) ≥ 7.5 mm. The optical lens designed in this way can be applied to a photosensitive element with a relatively large target surface, which can make the imaging module with this optical lens have a relatively large target surface, thereby being beneficial to improving the imaging brightness and resolution.

[0021] In some possible embodiments, the system focal length f of the optical lens and the maximum semi-field of view Semi-FOV of the optical lens satisfy the relational formula: f × tan(Semi-FOV) ≥ 8 mm.

[0022] Taking an optical lens including seven lenses as an example, several specific structural forms of the optical lens are described below. Exemplarily, 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.

[0023] Among them, the first lens has a positive optical power, the second lens has a negative optical power, the third lens has a positive optical power, the fourth lens has a positive optical power, the fifth lens has a negative optical power, the sixth lens has a positive optical power, and the seventh lens has a negative optical power. The sag of the edge of the image side 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 radius of curvature R12 of the image side 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 semi-field angle Semi-FOV satisfy the relationship of f × tan(Semi-FOV) = 8.235; the maximum semi-field angle 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.

[0024] Alternatively, the first lens has a positive optical power, the second lens has a negative optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, the fifth lens has a negative optical power, the sixth lens has a positive optical power, and the seventh lens has a negative optical power. The sag of the edge of the image side 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 radius of curvature R12 of the image side 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 semi-field angle Semi-FOV satisfy the relationship of f × tan(Semi-FOV) = 8.22; the maximum semi-field angle 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.

[0025] Alternatively, the first lens has a positive focal power, the second lens has a negative focal power, the third lens has a positive focal power, the fourth lens has a positive focal power, the fifth lens has a negative focal power, the sixth lens has a positive focal power, and the seventh lens has a negative focal power. The sag of the edge of the image side of the third lens satisfies the relation sag = 0.412 mm; the system focal length f and the entrance pupil diameter EPD satisfy the relation f / EPD = 1.48; the radius of curvature R12 of the image side of the sixth lens satisfies the relation R12 = -3.31; the system focal length f and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin satisfy the relation f / (EPDmax - EPDmin) = 2.35; the system focal length f and the maximum half field of view Semi-FOV satisfy the relation f × tan(Semi-FOV) = 8.08; the maximum half field of view Semi-FOV satisfies the relation Semi-FOV = 41.17°; the focal length f1 of the first lens and the system focal length f satisfy the relation f1 / f = 0.8345; the focal length f2 of the second lens and the system focal length f satisfy the relation f2 / f = -1.3464.

[0026] Alternatively, the first lens has a positive focal power, the second lens has a negative focal power, the third lens has a negative focal power, the fourth lens has a positive focal power, the fifth lens has a negative focal power, the sixth lens has a positive focal power, and the seventh lens has a negative focal power. The sag of the edge of the image side of the third lens satisfies the relation sag = 0.462 mm; the system focal length f and the entrance pupil diameter EPD satisfy the relation f / EPD = 1.485; the radius of curvature R12 of the image side of the sixth lens satisfies the relation R12 = -2.945; the system focal length f and the maximum entrance pupil diameter EPDmax and the minimum entrance pupil diameter EPDmin satisfy the relation f / (EPDmax - EPDmin) = 2.46; the system focal length f and the maximum half field of view Semi-FOV satisfy the relation f × tan(Semi-FOV) = 8.22; the maximum half field of view Semi-FOV satisfies the relation Semi-FOV = 41.2°; the focal length f1 of the first lens and the system focal length f satisfy the relation f1 / f = 0.825; the focal length f2 of the second lens and the system focal length f satisfy the relation f2 / f = -1.461.

[0027] Alternatively, the first lens has a positive focal power, the second lens has a negative focal power, the third lens has a positive focal power, the fourth lens has a positive focal power, the fifth lens has a negative focal power, the sixth lens has a positive focal power, and the seventh lens has a negative focal power. The sag of the edge of the image side of the third lens satisfies the relationship sag = 0.3248 mm; the system focal length f and the entrance pupil diameter EPD satisfy the relationship f / EPD = 1.38; the radius of curvature R12 of the image side of the sixth lens satisfies the relationship 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 f / (EPDmax - EPDmin) = 2.285; the system focal length f and the maximum half field of view Semi-FOV satisfy the relationship f × tan(Semi-FOV) = 7.806; the maximum half field of view Semi-FOV satisfies the relationship Semi-FOV = 40.56°; the focal length f1 of the first lens and the system focal length f satisfy the relationship f1 / f = 0.837; the focal length f2 of the second lens and the system focal length f satisfy the relationship f2 / f = -1.468.

[0028] In a second aspect, the present application further provides an imaging module, including a photosensitive element and the optical lens in any of the above possible implementation manners, and the photosensitive element is located on the image side of the optical lens. The photosensitive element can be used to convert the optical signal transmitted by the optical lens into an image signal, and the imaging module has a good shooting effect.

[0029] In a possible implementation manner, the imaging 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, and 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.

[0030] The imaging module in the above implementation manner has a first state close to the photosensitive element and a second state far from the photosensitive element, so that the imaging 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 imaging module and facilitates the realization of the thin design of the terminal where the imaging module is arranged. In the second state, the imaging module has a longer back focal length, so that the captured image has better image quality and improves the shooting effect of the system.

[0031] In a third aspect, the present application further provides a terminal, which includes an image processor and the imaging module in any of the above possible implementation manners. The image processor is communicatively connected to the imaging module. The imaging module is used to acquire image data and input the image data into the image processor, and the image processor is used to process the output image data. The terminal has a good imaging effect and is convenient for realizing a thin design. Description of the Drawings

[0032] 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.

[0033] Figure 1 is a schematic structural diagram of a terminal provided by an exemplary embodiment of the present application;

[0034] Figure 2 is a schematic structural diagram of a terminal provided in another exemplary embodiment of the present application;

[0035] Figure 3 1 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;

[0036] Figure 4 1 is a schematic structural diagram of an optical lens provided in the first embodiment of the present application;

[0037] Figure 5 1 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;

[0038] Figure 6 is an axial chromatic aberration curve diagram of the optical lens provided in the first embodiment of the present application;

[0039] Figure 7 is an optical distortion curve diagram of the optical lens provided in the first embodiment of the present application;

[0040] Figure 8 2 is a schematic structural diagram of an optical lens provided in a second embodiment of the present application;

[0041] Figure 9 2 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;

[0042] Figure 10 is an axial chromatic aberration curve diagram of the optical lens provided in the second embodiment of the present application;

[0043] Figure 11 is an optical distortion curve diagram of the optical lens provided in the second embodiment of the present application;

[0044] Figure 12 2 is a schematic structural diagram of an optical lens provided in a third embodiment of the present application;

[0045] Figure 13 2 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;

[0046] Figure 14 is an axial chromatic aberration curve diagram of the optical lens provided in the third embodiment of the present application;

[0047] Figure 15 is an optical distortion curve diagram of the optical lens provided in the third embodiment of the present application;

[0048] Figure 16 is a schematic structural diagram of an optical lens provided in a fourth embodiment of the present application;

[0049] Figure 17 2 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;

[0050] Figure 18 is an axial chromatic aberration curve diagram of the optical lens provided in the fourth embodiment of the present application;

[0051] Figure 19 is an optical distortion curve diagram of the optical lens provided in the fourth embodiment of the present application;

[0052] Figure 20 is a schematic structural diagram of an optical lens provided in a fifth embodiment of the present application;

[0053] Figure 21 1 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;

[0054] Figure 22 is an axial chromatic aberration curve diagram of the optical lens provided in the fifth embodiment of the present application;

[0055] Figure 23 This is an optical distortion curve diagram of the optical lens provided in the fifth embodiment of the present application. DETAILED DESCRIPTION

[0056] 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.

[0057] First, a unified explanation of terms that may be involved in the embodiments of the present invention is given.

[0058] 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.

[0059] Imaging plane: It refers to the plane where the image of the object to be photographed is formed after passing through the optical system. A photosensitive element can be arranged on the imaging plane, and the photosensitive element can be used to record the image of the object to be photographed after imaging.

[0060] Object side and image side: Taking the lens as the boundary, the side where the object to be photographed is located is the object side, and the surface of the lens facing the object side can be called the object side surface; taking 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 surface.

[0061] 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 rays; positive optical power can also be called positive refractive power, which means that a lens or a local area of a lens has a positive focal length and the ability to converge light rays; negative optical power can also be called negative refractive power, which means that a lens or a local area of a lens has a negative focal length and the ability to diverge light rays.

[0062] Focal length: Also known as the focal length, it is a measure of the converging or diverging effect of light rays. It refers to the distance between the optical center of a lens or a lens system and the imaging plane when a clear image of an infinitely distant scene is formed on the imaging plane through the lens or the lens system. The focal length of a lens is the distance from the optical center of the lens to the imaging plane. For a fixed-focus lens, the position of the optical center of the lens is fixed; for a zoom lens, the change in the position of the optical center of the lens brings about a change in the focal length of the lens.

[0063] Back focal length (BFL): Also known as the back focal length, it 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.

[0064] Total track length (TTL): It is the maximum distance on the optical axis between the lens closest to the object to be photographed and the imaging plane in an optical system.

[0065] Optical body length: It is the maximum distance on the optical axis between the lens closest to the object to be photographed and the lens closest to the imaging plane in an optical system. The optical body length is the main factor in determining the height of an optical lens along the optical axis.

[0066] Aperture: A device used to control the amount of light passing through the lens into the camera body, usually set within the lens. The size of the aperture is typically represented by the aperture value (F / number). The aperture value is equal to the ratio of the focal length of the optical system to the entrance pupil diameter, and 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 aperture value, the more light enters within the same unit of time. A variable aperture refers to an aperture whose aperture value can be adjusted.

[0067] Entrance pupil diameter (EPD): Refers to the diameter of the largest light beam that perpendicularly enters the lens from the object side along a direction 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 can be understood that in an optical system with a variable aperture, the entrance pupil diameter changes 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 of the optical system is the maximum entrance pupil diameter; when the aperture value of the variable aperture is the maximum aperture value within the variable range, the entrance pupil diameter of the optical system is the minimum entrance pupil diameter.

[0068] Field of view (FOV): With the lens of the optical system as the vertex, the angle formed by the two edges of the maximum range through which the image of the measured target can pass through the lens is called the field of view. The size of the field of view determines the viewing range of the optical system. The semi-field of view (Semi-FOV) is half of the field of view.

[0069] Stop: Includes the aperture stop and the field stop. Among them, the aperture stop is used to limit the width of the imaging light 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 in the object space that can be imaged by the optical system.

[0070] Axial chromatic aberration: Also known as longitudinal chromatic aberration or position chromatic aberration or axial aberration. A beam of light parallel to the optical axis converges at different positions before and after passing through the lens. This type of aberration is called position chromatic aberration or axial chromatic aberration. This is because the lens forms images of light of different wavelengths at different positions, resulting in the focal planes of the images of different colors of light not coinciding during the final imaging, and the composite light disperses to form chromatic dispersion.

[0071] Distortion, also known as aberration, is the degree of distortion of the image formed by an optical system of an object relative to the object itself. Distortion is due to the influence of the spherical aberration of the aperture stop. The height of the chief ray of different fields of view at the intersection with the Gaussian image plane after passing through the optical system is not equal to the ideal image height, and the difference between the two is the distortion. Therefore, distortion only changes the imaging position of off-axis object points on the ideal plane, causing the shape of the image to be distorted, but does not affect the clarity of the image.

[0072] The specific structures of the terminal 1000, the camera module 100, and the optical lens 10 will be specifically introduced below in conjunction with the relevant drawings.

[0073] As Figure 1 shown, in the first aspect of the present application, a terminal 1000 is provided. The terminal 1000 can be a mobile phone, a tablet computer, a laptop computer, a camera, a video recorder, a camera, a smart TV, a network monitoring device, a motion sensing game console, a driving recorder, a reverse imaging device, a wearable electronic device, a small unmanned aerial vehicle, a three-dimensional image capturing device, or other devices with a photographing or imaging function in other forms. Figure 1 is a schematic structural diagram of the terminal 1000 according to an embodiment of the present application. In this embodiment, the terminal 1000 is a mobile phone, and 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.

[0074] 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 configured to acquire image data and input the image data into the image processor 300. The image processor 300 is configured to process the input image data. In practical applications, the terminal 1000 further includes a housing. Both the camera module 100 and the image processor 300 are housed inside the housing. A light passing hole is provided on the housing, and the light incident side of the camera module 100 is disposed opposite to the light passing 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 means such as wiring, or data transmission may be achieved through coupling or other means. The camera module 100 and the image processor 300 may also be communicatively connected through any other means capable of achieving data transmission. The present application does not make specific limitations on this.

[0075] The function of the image processor 300 is to optimize the digital image signal through a series of mathematical algorithm operations, and finally transmit the processed signal to the display or memory. The image processor 300 can be an image processing chip or a digital signal processing chip (Digital Signal Processing, DSP). Its role is to quickly transfer the data obtained by the photosensitive element of the camera module 100 to the central processing unit and refresh the photosensitive element. Therefore, the quality of the DSP chip directly affects the picture quality (such as color saturation, clarity, etc.). The image processor 300 can also be integrated into other chips (such as the central processing chip).

[0076] In Figure 1 In the illustrated embodiment, the camera module 100 is disposed on the back of the terminal 1000 and serves as the rear camera of the terminal 1000. In some embodiments, the camera module 100 can also be selectively disposed on the front of the terminal 1000 and serve as the front camera of the terminal 1000. Both the front lens and the rear lens can be used for selfies or for the photographer to capture other objects.

[0077] In some embodiments, the terminal 1000 can be provided with multiple camera modules 100, where multiple means two or more. Different camera modules 100 can have the same or different structures and performances to meet different camera requirements respectively. For example, in some embodiments, the multiple camera modules 100 include a zoom camera module or a fixed-focus camera module to respectively achieve the functions of zoom shooting and fixed-focus shooting. And the multiple camera modules 100 can all be communicatively connected to the image processor 300, and the multiple camera modules 100 can selectively cooperate to achieve a better shooting effect.

[0078] It should be understood that Figure 1 The installation position of the camera module 100 of the terminal 1000 in the illustrated embodiment is only illustrative. In some other embodiments, the camera module 100 can also be installed at other positions on the mobile phone. For example, the camera module 100 can be installed at the upper part, the upper left corner or the upper right corner of the back of the mobile phone. Or, the camera module 100 can also not be disposed on the main body of the mobile phone, but on a component that can be moved or rotated relative to the mobile phone. For example, the component can extend, retract or rotate from the main body of the mobile phone. The present application does not make any limitation on the installation position of the camera module 100.

[0079] Such as Figure 2As shown, 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. Then, the image processor 300 processes the digital image signal, and finally, the image or video is displayed through the display screen or monitor.

[0080] In some embodiments, the terminal 1000 may further include a memory 400. The memory 400 is communicatively connected to the image processor 300. After the image processor 300 processes the digital image signal, it transmits the image to the memory 400 so that the image can be retrieved from the storage at any time when viewing the image is required later 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 can be understood that Figure 2 This is only a schematic structural diagram of the terminal 1000 provided by an exemplary embodiment of the present application. The positional structures of the camera module 100, the image processor 300, the analog-to-digital converter 200, and the memory 400 shown are only for illustration, and the present application does not limit their positions and specific structures.

[0081] In a second aspect, an embodiment of the present invention provides a camera module 100. The camera module 100 includes a photosensitive element 20 and an optical lens 10. The photosensitive element 20 is located on the image side of the optical lens 10. As Figure 3 shown, Figure 3 This shows a schematic structural diagram of the camera module 100 provided by an exemplary embodiment of the present application.

[0082] Please refer to Figure 3 shown. Based on the above embodiments, the working principle of the camera module 100 is as follows: The light reflected by the object to be photographed passes through the optical lens 10 to generate an optical image and projects it onto the surface of the photosensitive element 20. 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 to be converted into a digital image signal Sig2 by the analog-to-digital converter 200 and given to the image processor 300. The image processor 300 can display the digital image signal Sig2 through the display screen or monitor, or the image processor 300 can also 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 when viewing the image is required later and displayed on the display screen.

[0083] Specifically, the camera module 100 may further include a circuit board (not shown). The photosensitive element 20 is fixed to the circuit board by bonding or pasting, etc., and the analog-to-digital converter 200, the image processor 300, the memory 400, etc. are also connected to the circuit board by bonding or pasting, etc., so as to realize the 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 can be a flexible printed circuit (FPC) or a printed circuit board (PCB), which is used to transmit electrical signals. Among them, the FPC can 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, etc.

[0084] The photosensitive element is a semiconductor chip, and its surface contains hundreds of thousands to millions of photodiodes. When exposed to light, it will generate charges, which are converted into digital signals through an analog-to-digital conversion chip. The photosensitive element can be a charge coupled device (CCD) or a complementary metal-oxide semiconductor device (CMOS). The CCD is made of a high-sensitivity semiconductor material, which can convert light into charges and then into digital signals through an analog-to-digital conversion chip. The CCD consists of many photosensitive units, usually in units of millions of pixels. When the surface of the CCD is irradiated with light, each photosensitive unit will reflect the charges on the component, and the signals generated by all the photosensitive units are added together to form a complete picture. The CMOS mainly uses semiconductors made of silicon and germanium, so that semiconductors with N (negatively charged) and P (positively charged) levels coexist on the CMOS. The current generated by the complementary effect of these two can be recorded and interpreted as an image by the analog-to-digital conversion chip.

[0085] In this embodiment, the terminal 1000 may select a photosensitive element 20 with a large target surface. Taking the terminal 1000 as a mobile phone as an example for description, the photosensitive elements used in mobile phones in the related art usually have a target surface of 2 / 3 inches or 1 / 1.8 inches, while the mobile phone in the embodiment of the present application can select a photosensitive element 20 with a target surface greater than or equal to 1 inch. Or, it can also be understood that the mobile phone can use the photosensitive element of a single-lens reflex 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 enhance the imaging quality.

[0086] Of course, in other embodiments, the photosensitive element 20 may also be selected with a smaller target surface, and the imaging module 100 may select photosensitive elements 20 with different target surface sizes according to requirements. In embodiments where the terminal 1000 has multiple imaging modules 100, different imaging modules 100 may select photosensitive elements 20 with different target surface sizes to suit different imaging requirements. In other embodiments, multiple imaging modules 100 may also share one photosensitive element 20, or at least two of the multiple imaging modules 100 share one photosensitive element.

[0087] In some embodiments, the imaging 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 communicates with the receiving space, and the through hole is disposed opposite to the light passing hole of the outer shell. The driving member, the photosensitive element 20, and the optical lens 10 are all received 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 components in the optical lens 10 to achieve focusing, and the light incident side of the optical lens 10 faces the through hole. In other embodiments, the imaging module 100 may not have a housing, and the photosensitive element 20 is fixed to a bracket or other structure.

[0088] In some embodiments, the driving member may be used to drive related elements of the optical lens 10 to achieve focusing or anti-shake of the optical lens 10 (or the imaging module 100). The driving member may include one or more driving parts, and the driving part is used to drive related elements of the optical lens 10 to perform focusing and / or optical anti-shake. When the driving member drives related elements of the optical lens 10 to perform focusing, relative movement between related elements of the optical lens 10 is driven by the driving part to achieve focusing. When the driving member drives related elements of the optical lens 10 to perform anti-shake, the related elements of the optical lens 10 are driven to move or rotate relative to the photosensitive element 20, and / or the related elements of the optical lens 10 are driven to move or rotate relative to each other to achieve optical anti-shake. Among them, the driving part may specifically be a driving structure such as a motor or an electric machine.

[0089] Since the overall optical length of the optical lens 10 affects the overall height of the imaging module 100, and the overall height of the imaging module 100 is an important reference index for the size design of the terminal 1000. In some embodiments, in order to reduce the overall height of the imaging module 100, the driving member may also be used to drive the optical lens 10 away from or close to the photosensitive element 20, so that the imaging module 100 has different states. As an exemplary embodiment, the optical lens 10 of the imaging module 100 may adopt a pop-up design.

[0090] Exemplarily, the imaging module 100 has a first state and a second state. In the first state, the distance between the lens closest to the photosensitive element 20 in the optical lens 10 and the photosensitive element 20 is a first distance. In the second state, the distance between the lens closest to the photosensitive element 20 in the optical lens 10 and the photosensitive element 20 is a second distance, and the second distance is greater than the first distance.

[0091] In the above embodiment, when the imaging module 100 is in the first state, the optical lens 10 is disposed close to the photosensitive element 20 and is in an unextended state. The total optical length of the optical lens 10 is relatively small, which is beneficial to making the terminal 1000 applying the imaging module 100 achieve a thin design. Taking the terminal 1000 as a mobile phone as an example, when the imaging module 100 is in the first state, the imaging module 100 is in a non-working state. The optical lens 10 is disposed close to the photosensitive element 20, and the height of the optical lens 10 protruding from the terminal housing is relatively small, which will not restrict the thin design of the terminal 1000, so that the terminal 1000 can have a good sense of thinness and lightness. When the imaging module 100 needs to be used, the optical lens 10 at least partially extends out of the housing from the light inlet hole, so that the imaging module 100 switches from the first state to the second state. In the second state, the imaging module 100 can implement a shooting function. The optical lens 10 is far from the photosensitive element 20, so that it can have a relatively long back focus, which is convenient for the focusing or zooming operation of the imaging module 100 and helps the imaging module 100 achieve a better shooting effect. In this embodiment, the imaging module 100 can drive the optical lens 10 to move through a driving member or a motor, etc., to drive the imaging module 100 to switch between the first state and the second state. The present application does not make specific limitations on this.

[0092] In some embodiments, the optical lens 10 may further include an infrared filter. The infrared filter may be disposed at one end of the optical lens 10 facing the image side and located 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 irradiates on the infrared filter, and after the filtering effect of the infrared filter, it irradiates on 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, so as to improve its effective resolution and color reproducibility. In some other embodiments, the infrared filter may also be fixed on the circuit board where the photosensitive element 20 is located. Other elements included in the imaging module 100 will not be elaborated one by one here.

[0093] In some other embodiments, an imaging correction element may also be disposed on one side of the optical lens 10 close to the imaging surface to achieve the effect of correcting the image (such as image curvature, etc.).

[0094] The following will specifically introduce the structure of the optical lens 10 and the setting of relevant optical parameters in conjunction with the accompanying drawings.

[0095] As Figure 3 shown, in some embodiments, the embodiment of the present application provides an optical lens 10, which may include at least seven lenses. Each lens L includes an object side surface facing the object side and an image side surface facing the image side. 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 along the direction from the object side to the image side. Among them, the first lens L1 has a positive optical power, the refractive index of the first lens L1 is greater than 1.6, the sag height at the edge of the image side surface of the third lens L3 is greater than 0.3 mm, and the sag height at the edge of the object side surface of the third lens L3 is greater than zero.

[0096] It can be understood that the optical lens 10 is composed of multiple different lenses. Different lens combinations (such as the order of the lenses arranged along the optical path, lens material, refractive index, shape curvature, etc.) bring different optical performances. And the lens in the optical lens 10 that is closer to the object side undertakes a greater work of adjusting the optical path, and is also more important for the adjustment of the optical effect. The embodiment of the present application limits the optical performances of the first lens L1 and the third lens L3, and the following will be described in conjunction with specific embodiments.

[0097] The first lens L1 has a positive optical power, that is, the first lens L1 plays a role in converging light. The refractive index of the first lens L1 is greater than 1.6. For example, the refractive index of the first lens L1 can be any one of 1.65, 1.75, 1.80, 1.85, 1.90, or 2.0. To meet the requirements of the refractive index of the first lens L1. Exemplarily, the first lens L1 can be made of glass material. In some embodiments, the first lens L1 can also be made of other composite materials with a refractive index in the range of 1.6 to 2.0.

[0098] Based on the fact that the first lens L1 has a light converging 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 in the optical lens 10 that is closest to the object side, the first lens L1 can play a good role in adjusting the optical path. Compared with the lens with a refractive index of about 1.55 in the 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 a good light converging ability, and a thinner first lens L1 with strong aberration correction ability is obtained. 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 overall optical length of the optical lens 10 to be shortened.

[0099] 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 this point is on the image side of the lens surface, the sagittal height of this point is a positive number. Conversely, if the projection point of this point is on the object side of the lens surface, the sagittal height of this point is a negative number. Refer to Figure 3 As shown, the sagittal height at the edge of the image side surface of the third lens L3 is greater than 0.3 mm, 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 0.3 mm, and the projection point of the edge of the image side surface of the third lens L3 on the optical axis is on the image side of the image side surface of the third lens L3. And 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 on the image side of the object side surface of the third lens L3.

[0100] The sagittal height of the edge of the image side surface of the third lens L3 is greater than 0.3 mm. Specifically, the sagittal height of the edge of the image side surface of the third lens L3 can be in the range of 0.3 mm - 0.50 mm, such as 0.32 mm, 0.42 mm, 0.46 mm or 0.48 mm, etc. Combined with the fact that the sagittal height of the edge of the object side surface of the third lens L3 is greater than zero, it can be restricted that the edge region of the third lens L3 is closer to the image side compared to the paraxial region of the third lens L3. The third lens L3 with this shape can have good light converging ability, and the edge of the third lens L3 can adjust and correct the position of the light, thereby improving the imaging quality.

[0101] It should be noted that regardless of whether the third lens L3 has a positive focal power or a negative focal power, the third lens L3 has good light converging ability. Refer to Figure 4 and Figure 5 As shown, Figure 4 shows a schematic structural diagram of the optical lens 10 provided in the first embodiment of the present application. Figure 5 Among them, the propagation path of light in the optical lens 10 provided in the first embodiment is exemplarily shown by lines. Among them, the third lens L3 has a positive focal power, and the third lens L3 can adjust the exit position and exit angle of the light, thereby correcting the position of the light. Refer to Figure 8 and Figure 9 As shown, Figure 8 shows a schematic structural diagram of the optical lens 10 provided in the second embodiment of the present application. Figure 9 Among them, the propagation path of light in the optical lens 10 provided in the second embodiment is exemplarily shown by lines. Among them, the third lens L3 has a negative focal power, and the third lens L3 can adjust the angle of the light, thereby adjusting or correcting the position of the light. Refer to Figure 5 and Figure 9As shown, 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 a positive optical power or a negative optical power, the light rays on the image side of the third lens L3 are still more convergent than the light rays on the object side of the third lens L3. The third lens L3 plays a role in converging light rays, making the light rays more concentrated, enabling the light rays to reach the expected position at a shorter distance in the gap, which is beneficial to shortening the gap between the third lens L3 and the fourth lens L4 and reducing the overall optical length of the optical lens 10.

[0102] In the above embodiment, the optical lens 10 can have good light converging ability. The first lens L1 can play a good role in adjusting the optical path, and while having good light converging ability, it can have a small axial thickness, obtaining a thinner first lens L1 with strong aberration correction ability. The third lens L3 further converges the light rays and adjusts the phase difference of the light rays, enabling the optical lens 10 to have a smaller overall optical length while ensuring good imaging ability of the optical lens 10, facilitating the arrangement of the optical lens 10. Especially when the optical lens 10 is arranged in the terminal 1000, it is beneficial to realize the thinness of the terminal 1000.

[0103] In some embodiments, the optical lens 10 can be applicable to a large aperture, that is, the optical lens 10 can be used in scenarios with a large light input. The light input of the aperture is inversely correlated with the aperture value. The smaller the aperture value, the larger the light input of the aperture. Here, the large aperture can refer to an aperture with an aperture value less than or equal to F / 2.8. For example, the aperture value can be F / 1.8, F / 1.6, F / 1.4, etc. When the optical lens 10 provided in this embodiment is used for large-aperture photography, the optical lens 10 has a large light input. Both the first lens L1 and the third lens L3 have good light-gathering ability. Even if the overall optical length of the optical lens 10 is small, it can still have a good light-gathering effect on the incident light rays, enabling the optical lens 10 to have good imaging quality during large-aperture photography. The optical lens 10 provided in this application can be applicable to a large aperture and maintain good imaging effects, thus having good application prospects.

[0104] The terminal 1000 applying the optical lens 10 of the above embodiment can have an imaging mode with a large aperture, a small depth of field, and high quality. For example, in the embodiment where the terminal 1000 is a mobile phone, the mobile phone can have a "portrait mode". In this mode, the photography of the optical lens 10 can meet the requirements of large-aperture, small-depth-of-field, and high-quality photography, enabling the mobile phone to have good photography effects and improving the user experience.

[0105] It should be noted that the optical power and material of other lenses not specified in the above optical lens 10 may not be restricted. In actual applications, the optical properties of other lenses can be adjusted adaptively 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 various optically complex lens structures, but the refractive index of plastic materials has a relatively small selection range. The refractive index of optical lenses made of glass materials has a larger selection range, and it is easier to obtain thinner but better-performing glass lenses, but it is not easy to produce optically complex lens structures. In some embodiments, the lenses of the optical lens 10 may also include two or more sub-lenses that are attached to each other. The materials of the two sub-lenses can be different. By selecting sub-lenses with different materials and attaching them together to form a lens, the Abbe number and refractive index of the lens can be adjusted, which is equivalent to being able to further increase the range of the refractive index and Abbe number of the lens, and it is easier to obtain thinner and better-performing lenses.

[0106] Based on this, in some embodiments of the present application, considering the manufacturing cost, efficiency, and optical effect, the specific application materials of different lenses are reasonably matched according to needs. In some embodiments, among at least seven lenses of the optical lens 10, the first lens L1 is made of glass, and the remaining lenses are all made of resin materials. This ensures that the first lens L1 plays a good role in focusing light, and the remaining lenses are all made of resin materials, which can facilitate the production of optically complex lens structures to perform different refractive treatments on light and meet different optical requirements.

[0107] As Figure 3 shown, 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 of the seventh lens L7 of the optical lens 10 and the imaging surface ( Figure 3 where the photosensitive element 20 in coincides 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 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 of the first lens L1 and the image side of the seventh lens L7 on the optical axis. It can be understood that TTL1 is the main factor forming the height of the optical lens 10 along the optical axis. The meanings of BFL, TTL, and TTL1 appearing at various positions in the present application are the same and will not be elaborated further when they appear later.

[0108] In some embodiments, the back focal length BFL of the optical lens 10 and the overall optical length TTL of the optical lens 10 may satisfy the relational expression of 4 ≤ TTL / BFL ≤ 7. The ratio of the overall optical length TTL to the back focal length BFL of a conventional optical system is usually greater than 10, that is, the TTL of the conventional lens design is larger and the BFL is smaller. In the embodiments of the present application, the ratio between the overall optical length TTL and the back focal length BFL satisfies the above relational expression, which can make the back focal length BFL account for a larger proportion compared to the overall optical length TTL of the optical lens 10, so that the optical lens 10 has a larger back focal length BFL compared to a conventional optical lens. In a large aperture shooting scenario, the light entry range of the optical lens is large and the light entry amount is large. A longer light processing path and a larger back focal length BFL are required to achieve converging imaging. The optical lens 10 in the embodiments of the present application has a larger back focal length BFL, which can provide a longer converging path for light, meet the path requirements for light convergence in a large aperture scenario, and enable the optical lens 10 to have a better imaging effect when using a larger aperture, reducing imaging problems such as defocus, blur, or distortion. Moreover, the optical lens 10 in this embodiment has a smaller overall optical body length TTL1 compared to a conventional optical lens, which can facilitate the arrangement of the optical lens 10 and is conducive to realizing the thinning of the terminal 1000 where the optical lens 10 is arranged.

[0109] The optical lens 10 in the above embodiments has a larger back focal length BFL, and the gap between the image side of the seventh lens L7 and the imaging surface is large, which can also allow the optical lens 10 to be applicable to the pop-up type imaging module 100. Specifically, when the pop-up type imaging module 100 is in the working state, the back focal length BFL of the optical lens 10 is large, which can reserve enough gap for light to form a clear image on the imaging surface, so that the optical lens 10 has good imaging quality. The gap between the image side of the seventh lens L7 and the imaging surface can also reserve space for the movement of the optical lens 10. When the imaging module 100 switches to the non-working state, the optical lens 10 can move at least part of the distance towards 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 realizing the thinning design of the terminal 1000 applying the imaging module 100.

[0110] Based on the above description, it can be known that the optical lens 10 in the embodiment of the present application has a relatively long back focal length in the pop-up state of the camera module 100. Therefore, it is convenient for the focusing or zooming operation of the camera module 100, which helps the camera module 100 to achieve a better shooting effect. 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 scenarios. Therefore, the shooting requirements of multiple scenarios can be taken into account. In addition, the optical lens 10 is combined with a photosensitive element with a large target surface, which can achieve better optical quality, thereby helping to improve the imaging quality of the camera module 100.

[0111] In some embodiments, the ratio of the focal length f1 of the first lens L1 in the optical lens 10 to the system focal length f of the optical lens 10 satisfies the relational expression 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 can be understood that the first lens L1 has a positive optical power, and the ratio of the focal length f1 of the first lens L1 to the system focal length f of the optical lens 10 is greater than zero. In the optical lens 10 that satisfies the above relational expression, the focal length f1 of the first lens L1 is greater than zero and less than the system focal length f, which can effectively control the focal length range of the first lens L1, so that the first lens L1 plays a good role in concentrating light, ensuring that the system can better converge light. And in this embodiment, by controlling the focal length of the first lens L1, the light has good aggregation after exiting from the image side of the first lens L1, and the second lens L2 can be arranged close to the first lens L1, thereby reducing the gap between the first lens L1 and the second lens L2, which is beneficial to reducing the total optical length TTL of the optical lens 10.

[0112] 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 relational expression -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, etc. It can be understood that 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, indicating that the second lens L2 has a negative optical power, that is, it has the effect of diverging light. 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 enables the second lens L2 to effectively control the propagation direction of light.

[0113] The side surfaces of the lenses in the embodiments of the present application can be spherical or aspherical. Generally speaking, the center of curvature of any point on the side surface of the lens is located on the image side of the tangent line at that point, and the radius of curvature at that point is positive. While the center of curvature of any point on the side surface of the lens is located on the object side of the tangent line at that point, and the radius of curvature at that point is negative. Refer to Figure 3As shown, in some embodiments, the radius of curvature of the center of the image side surface of the third lens L3 is less than zero, that is, the center of the image side surface of the third lens L3 is concave toward the object side.

[0114] In some embodiments, the paraxial region of the sixth lens L6 has a positive optical power. It should be noted that the paraxial region refers to the region on the lens with ideal optical properties. In this region, the actual optical path calculation result of the lens is the same as the ideal optical path calculation result calculated by the Gaussian formula, and this region is usually located near the optical center of the lens. The paraxial region of the sixth lens L6 has a positive optical power, and the sixth lens L6 with positive optical power has the effect of converging light rays in the paraxial region, which is conducive to the converging imaging of light rays.

[0115] In the above embodiments, the refractive property of the edge region of the sixth lens L6 for light rays can be converging or diverging, and the refractive property of the edge region 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 imaging module 100.

[0116] 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 light ray direction in the paraxial region, converge the light rays while adjusting the position where the light rays are incident on the seventh lens L7, so as to correct the aberration and achieve a better imaging effect.

[0117] In some embodiments, the paraxial region of the seventh lens L7 has a negative optical power, and the paraxial region of the seventh lens L7 has the effect of diverging light rays. In some embodiments, the radius of curvature of the center of the object side surface of the seventh lens L7 is less than 0, and the center of the object side surface of the seventh lens L7 is concave, so that the seventh lens L7 can effectively control the light ray direction in the inner field of view. Combined with the property that the seventh lens L7 has a negative optical power, it can adjust the light ray exit position while diverging the light rays, so that the light rays can achieve good converging imaging on the imaging surface.

[0118] In the above embodiments, the refractive property of the seventh lens L7 for light rays can be converging or diverging, and the refractive property of the edge region 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 imaging module 100.

[0119] The sixth lens L6 and the seventh lens L7 can also cooperate to achieve the effects of correcting the system spherical aberration, reducing the distortion of the edge field of view and correcting the astigmatism, and improving the imaging quality of the optical lens 10.

[0120] In some embodiments, the shape of 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 Figure 3As shown, the center of the image side of the sixth lens L6 and the center of the object side of the seventh lens L7 have good shape adaptability, which can reduce the possibility of position 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, and it is easier to achieve an arrangement scheme with a small gap between the sixth lens L6 and the seventh lens L7, which is conducive to reducing the optical body length of the optical lens 10.

[0121] In some embodiments, the system focal length f of the optical lens 10 and the entrance pupil diameter EPD of the optical lens 10 can satisfy the relational expression of 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. The aperture value of the optical lens 10 that satisfies the above relational expression is less than 1.55, that is, the entrance pupil diameter EPD of the optical lens 10 is large, and the optical lens 10 can have a larger light input amount, which can make the depth of field of the camera shallow. The focus points within the depth of field are clear, while other scenes outside the depth of field will be blurred, so that the main body can be better highlighted and the picture can be simplified.

[0122] It can be understood that the optical lens 10 provided in the embodiments of the present application can not only be applicable to large apertures, and large aperture photography is only an optional working mode for it. In some embodiments, the optical lens 10 can be provided with a diaphragm STO, and the diaphragm STO here is specifically an aperture stop. By changing the light passing diameter of the diaphragm STO, the aperture value can be adjusted. Different light passing diameters correspond to different aperture values, that is, different depths of field, so that the optical lens 10 can adapt to different shooting scenes. For example, the optical lens 10 can reduce the aperture value in a dark environment to increase the light input amount and enhance the image quality. In a bright environment, the optical lens 10 can increase the aperture value to reduce the light input amount and avoid overexposure affecting the imaging effect.

[0123] Moreover, when the light-transmitting diameter of the aperture STO is relatively large, the aperture value of the optical lens 10 is relatively small, and it has the characteristic of a large aperture. Therefore, the depth of field can be made shallower, and the focus point can be made clear, while other scenes outside the depth-of-field range will be blurred, so that the main body can be better highlighted and the picture can be simplified. In addition, using 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 shooting handheld in a low-light or dark environment, the increase in the shutter speed can reduce the impact of hand shake on the picture clarity, which is beneficial for the imaging module 100 to take better night-view pictures. When the light-transmitting diameter of the aperture STO is relatively small, the aperture value of the optical lens 10 is relatively large, with the characteristic of a small aperture. Therefore, a large depth of field can be obtained, and the background or foreground outside the focused main body can also be kept clear. In addition, the small aperture can reduce the amount of light entering the optical lens 10, which can slow down the shutter speed, so that it is beneficial for moving objects to leave motion traces on the picture. Therefore, the optical lens 10 can also shoot scenes such as flowing water, vehicle tracks, star tracks, and light painting in the small-aperture mode.

[0124] In an embodiment with 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 can be understood that the entrance pupil diameter EPD changes 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 this 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 this maximum aperture value is the minimum entrance pupil diameter EPDmin. In some embodiments, the optical lens 10 can satisfy the relational expression f / (EPDmax - EPDmin) ≥ 1.6. The aperture value of the optical lens 10 that satisfies the above relational expression can be adjusted. Within the adjustable range of this aperture value, the optical system 10 can provide different depth-of-field ranges for different scenes by adjusting to different aperture values, and can meet the shooting requirements of multiple scenes.

[0125] The size of the field of view angle of the optical lens 10 determines the field of view range of the optical lens 10. The semi-field of view (SemiField of View, Semi-FOV) is half of the field of view angle. In some embodiments, the maximum semi-field of view Semi-FOV (Semi Field of View) 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 shooting angle of the system, making the optical distortion of the optical lens 10 smaller when it is used as the main camera lens, and enabling good imaging effects.

[0126] It can be understood that there is a geometric correspondence among the system focal length f of the optical lens 10, the maximum semi-field angle 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 semi-field angle Semi-FOV of the optical lens 10 satisfy the relational expression f×tan(Semi-FOV)≥7.5mm. The imaging module 100 in this embodiment has a relatively large target surface, which is beneficial to improving the imaging brightness and resolution.

[0127] In some embodiments, the system focal length f of the optical lens 10 and the maximum semi-field angle Semi-FOV of the optical lens 10 satisfy the relational expression f×tan(Semi-FOV)≥8mm.

[0128] The optical lens 10 in the embodiments of the present application can achieve a balance among a large aperture, a large target surface, and the 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 relational expression f / EPD≤1.55, and the system focal length f of the optical lens 10 and the maximum semi-field angle Semi-FOV of the optical lens 10 satisfy the relational expression f×tan(Semi-FOV)≥7.5mm. In this embodiment, the optical lens 10 applies 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 light-gathering performance and 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. When applied to a large aperture and a large target surface, it can ensure that the optical lens 10 has good imaging ability, and at the same time, the optical lens 10 has a smaller overall optical length. The optical lens 10 is more convenient to arrange. Especially when the optical lens 10 is arranged in the terminal 1000, it is beneficial to realize the thinness of the terminal 1000.

[0129] Combining the relational expressions provided in the foregoing different embodiments, multiple specific embodiments of the present application can be obtained. The imaging effect of the optical lens 10 will be described in detail below with reference to specific embodiments.

[0130] As Figure 4 shown, in the first embodiment of the present application, along the direction from the object side to the image side, a stop STO, a first lens L1 with positive optical power, a second lens L2 with negative optical power, a third lens L3 with positive optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with negative optical power, an infrared filter IR, and an imaging surface IMA are arranged in sequence. The specific design parameters in the first embodiment are as follows.

[0131] The sag of the edge of the image side of the third lens L3 satisfies: sag = 0.48 mm;

[0132] 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;

[0133] The radius of curvature R12 of the image side of the sixth lens L6 satisfies: R12 = -3.03;

[0134] 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;

[0135] 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: f×tan(Semi - FOV) = 8.235;

[0136] The maximum half field of view Semi - FOV of the optical lens 10 satisfies: Semi - FOV = 41.26°;

[0137] 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;

[0138] 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.

[0139] Based on the design parameters of the first embodiment, the basic parameters of the optical lens 10 in the first embodiment are shown in Table 1A below.

[0140] Table 1A. Basic parameters of the optical lens in the first embodiment

[0141] System focal length f 9.3887 mm Aperture value F 1.51 Maximum semi-field of view Semi-FOV 41.26° Maximum image height IH 16.6 mm Total optical length TTL 11.421 mm Design wavelength 650 nm, 610 nm, 555 nm, 510 nm, 470 nm

[0142] In Table 1A, the maximum image height IH is specifically the diagonal length of the effective pixel region of the imaging surface of the optical lens 10, that is, it represents the diagonal length of the effective pixel region on the photosensitive element 20.

[0143] Based on the design parameters of the first embodiment, the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical lens 10 in the first embodiment are shown in Table 1B below, where the thickness refers to the distance from this surface along the optical axis to the next surface, and the Abbe number of the lens is also called the dispersion coefficient, which is the degree of dispersion of the optical material at different wavelengths.

[0144] Table 1B. Radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical lens.

[0145]

[0146]

[0147] In Table 1B above, STO represents the diaphragm, 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, and IR represents the infrared filter. S1 represents the object side of the lens; S2 represents the image side of the lens. IMA represents the imaging surface.

[0148] Based on the design parameters of the first embodiment, the conic coefficients and aspheric coefficients of the lenses in the optical lens 10 in the first embodiment are shown in Table 1C below.

[0149] Table 1C. Conic coefficients and aspheric coefficients of the lenses in the optical lens.

[0150]

[0151]

[0152] In Table 1C above, STO represents the diaphragm; 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 of the lens; S2 represents the image side of the lens; Ai represents the i-th order aspheric coefficient, for example, A2 represents the second-order aspheric coefficient.

[0153] As can be seen from Table 1C, the first lens L1 to the seventh lens L7 altogether contain 14 aspheres. Based on the conic coefficient K and the i-th order aspheric coefficient Ai provided in Table 1C, the aspheric surface profiles of the lenses in the first embodiment can be obtained.

[0154] In some embodiments, all even-order aspheric surface profiles z can be defined by, but not limited to, the following aspheric formula:

[0155]

[0156] where z is the sag of the aspheric surface, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the conic coefficient, and Ai represents the i-th order aspheric coefficient.

[0157] Figure 4 The structural schematic diagram of the optical lens 10 provided by the first embodiment is shown, where the structural schematic diagram of the optical lens 10 is a simulation image obtained by the above aspheric formula.

[0158] Figure 5The structural schematic diagram of the optical lens 10 provided by the first embodiment is shown. Among them, the propagation path of light in the optical lens 10 is exemplarily shown by lines. It should be noted that the illustrated light propagation path is the light propagation path simulated under ideal conditions, for reference only 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.

[0159] Figure 6 The axial chromatic aberration curve graph of the optical lens 10 provided by the first embodiment is shown. Specifically, Figure 6 The axial chromatic aberration curves of light with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the optical lens 10 provided by the first embodiment are shown, which can also be called spherical aberration curves. Among them, the ordinate represents the normalized pupil coordinate, and the abscissa represents the chromatic aberration in the axial direction. The unit of chromatic aberration is millimeters. Refer to Figure 6 As shown, the axial chromatic aberrations of each wavelength in the first embodiment can be controlled within a very small range.

[0160] Figure 7 The optical distortion curve graph of the optical lens 10 provided by the first embodiment is shown. Among them, the optical distortion curve graph of light with a wavelength of 555nm passing through the optical lens 10 of the first 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. Among them, the ordinate represents the image height, and the abscissa represents the distortion value. The distortion value is specifically the ratio between the actual shape and the ideal shape (percentage value, unit: %). Refer to Figure 7 As shown, the optical distortion of the optical lens 10 in the first embodiment can be controlled within 3%, and the optical distortion within this range is difficult to be identified by the naked eye. That is, the optical lens 10 can obtain a high-quality imaging effect.

[0161] It can be seen from this that in the first embodiment, each lens of the optical lens 10 plays different refractive roles and cooperates with each other, and an optical lens 10 with good imaging quality and a smaller overall optical length can be obtained. Specifically, the first lens L1 has a good light-gathering effect and a smaller axial thickness, the second lens L2 can adjust the light, the third lens L3 can play a good light-converging role, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L6 can effectively correct the system spherical aberration, reduce the distortion of the edge field of view, and correct astigmatism. There is a smaller gap between the sixth lens L6 and the seventh lens L7, so that the optical lens 10 has a good imaging effect. The overall optical length TTL of the optical lens 10 is 11.421mm. The overall optical length of the optical lens 10 is small, and the space required for arranging the optical lens 10 on the terminal 1000 is small, which is convenient for realizing the thinness of the terminal 1000.

[0162] As Figure 8 shown, in the second embodiment of the present application, along the direction from the object side to the image side, there are arranged in sequence a stop STO, a first lens L1 with a positive focal power, a second lens L2 with a negative focal power, a third lens L3 with a negative focal power, a fourth lens L4 with a positive focal power, a fifth lens L5 with a negative focal power, a sixth lens L6 with a positive focal power, a seventh lens L7 with a negative focal power, an infrared filter IR, and an imaging surface IMA. The specific design parameters in the second embodiment are as follows, and the meanings of the parameters refer to the relevant descriptions in the first embodiment.

[0163] The sag of the edge of the image side surface of the third lens L3 satisfies: sag = 0.46 mm;

[0164] 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;

[0165] The radius of curvature R12 of the image side surface of the sixth lens L6 satisfies: R12 = -2.93;

[0166] 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;

[0167] The system focal length f of the optical lens 10 and the maximum semi-field angle Semi - FOV of the optical lens 10 satisfy: f×tan(Semi - FOV) = 8.22;

[0168] The maximum semi - field angle Semi - FOV of the optical lens 10 satisfies: Semi - FOV = 41.2°;

[0169] 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;

[0170] 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.

[0171] Based on the design parameters of the second embodiment, the basic parameters of the optical lens 10 in the second embodiment are as shown in Table 2A below.

[0172] Table 2A. Basic parameters of the optical lens in the second embodiment

[0173] System focal length f 9.385 mm Aperture value F 1.52 Maximum semi-field of view Semi-FOV 41.2° Maximum image height IH 16.6 mm Total optical length TTL 11.44 mm Design wavelength 650 nm, 610 nm, 555 nm, 510 nm, 470 nm

[0174] 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.

[0175] Table 2B. Curvature radius, thickness, refractive index and Abbe coefficient of each lens in the optical lens.

[0176]

[0177] 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.

[0178] Table 2C. Conic coefficients and aspheric coefficients of each lens in the optical lens.

[0179]

[0180]

[0181] 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.

[0182] In some embodiments, all even-order aspheric surface types z can be defined using, but not limited to, the following aspheric formula:

[0183]

[0184] 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.

[0185] Figure 8 A schematic structural diagram of the optical lens 10 provided in the second embodiment is shown, wherein the schematic structural diagram of the optical lens 10 is a simulated image obtained by the above-mentioned aspheric formula.

[0186] Figure 9 A schematic structural diagram of the optical lens 10 provided in the second embodiment is shown, 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.

[0187] Figure 10 The axial chromatic aberration curve of the optical lens 10 provided in the second embodiment is shown. Specifically, Figure 10The axial chromatic aberration curve of light with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm after passing through the optical lens 10 provided by the second embodiment is shown. Here, the ordinate represents the normalized pupil coordinate, and the abscissa represents the chromatic aberration in the axial direction. The unit of chromatic aberration is millimeters. Refer to Figure 10 As shown, the axial chromatic aberration of each wavelength in the second embodiment can be controlled within a very small range.

[0188] Figure 11 The optical distortion curve diagram of the optical lens 10 provided by the second embodiment is shown. Among them, the optical distortion curve diagram of light with a wavelength of 555nm 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. Here, 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. The ordinate of the optical distortion curve diagram can be selected as the incident angle or the image height; the abscissa represents the distortion value, and the distortion value is specifically the ratio between the actual shape and the ideal shape (percentage value, unit: %). Refer to Figure 11 As shown, the optical distortion of the optical lens 10 in the second embodiment can be controlled within 3%, and the optical distortion within this range is difficult to be identified by the naked eye. That is, the optical lens 10 can obtain a high-quality imaging effect.

[0189] Thus, it can be seen that in the second embodiment, each lens of the optical lens 10 plays different refractive roles and cooperates with each other, and an optical lens 10 with good imaging quality and a smaller overall optical length can be obtained. Specifically, the first lens L1 has a good light-gathering effect and a smaller axial thickness. The second lens L2 can adjust the light. The third lens L3 can play a good role in converging the light. The fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L6 can effectively correct the spherical aberration of the system, reduce the distortion of the edge field of view, and correct the astigmatism. There is a smaller gap between the sixth lens L6 and the seventh lens L7, so that the optical lens 10 has a good imaging effect. The overall optical length TTL of the optical lens 10 is controlled at 11.44mm. The overall optical length of the optical lens 10 is small, and the space required for arranging the optical lens 10 on the terminal 1000 is small, which is convenient for realizing the thinness of the terminal 1000.

[0190] As Figure 12As shown, in the third embodiment of the present application, along the direction from the object side to the image side, there are arranged in sequence a stop STO, a first lens L1 with positive optical power, a second lens L2 with negative optical power, a third lens L3 with positive optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with negative optical power, an infrared filter IR, and a photosensitive surface IMA. The specific design parameters in the third embodiment are as follows. For the meanings of each parameter, refer to the relevant descriptions in the first embodiment.

[0191] The sag of the edge of the image side surface of the third lens L3 satisfies: sag = 0.412 mm;

[0192] 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;

[0193] The radius of curvature R12 of the image side surface of the sixth lens L6 satisfies: R12 = -3.31;

[0194] 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;

[0195] The system focal length f of the optical lens 10 and the maximum semi-field angle Semi-FOV of the optical lens 10 satisfy: f×tan(Semi-FOV) = 8.08;

[0196] The maximum semi-field angle Semi-FOV of the optical lens 10 satisfies: Semi-FOV = 41.17°;

[0197] 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;

[0198] 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.

[0199] Based on the design parameters of the third embodiment, the basic parameters of the optical lens 10 in the third embodiment are as shown in Table 3A below.

[0200] Table 3A. Basic parameters of the optical lens in the third embodiment <> <>

[0201] System focal length f 9.247 mm Aperture value F 1.48 Maximum semi-field of view Semi-FOV 41.17° Maximum image height IH 16.6 mm Total optical length TTL 11.324 mm Design wavelength 650 nm, 610 nm, 555 nm, 510 nm, 470 nm

[0202] Based on the design parameters of the third embodiment, the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical lens 10 in the third embodiment are as shown in Table 3B below.

[0203] Table 3B, the curvature radius, thickness, refractive index, and Abbe number of each lens in the optical lens.

[0204]

[0205] Based on the design parameters of the third embodiment, the conic coefficients and aspheric coefficients of each lens in the optical lens 10 in the third embodiment are shown in Table 3C below.

[0206] Table 3C, the conic coefficients and aspheric coefficients of each lens in the optical lens.

[0207]

[0208]

[0209] As can be seen from Table 3C, the first lens L1 to the seventh lens L7 altogether contain 14 aspheric surfaces. Based on the conic coefficient K and the i-th order aspheric coefficient Ai provided in Table 3C, the aspheric surface profiles of each lens in the third embodiment can be obtained.

[0210] In some embodiments, all even-order aspheric surface profiles z can be defined by, but not limited to, the following aspheric formula:

[0211]

[0212] where z is the sag of the aspheric surface, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the conic coefficient, and Ai represents the i-th order aspheric coefficient.

[0213] Figure 12 Shows a schematic structural diagram of the optical lens 10 provided by the third embodiment. Among them, the schematic structural diagram of the optical lens 10 is a simulation image obtained by the above aspheric formula.

[0214] Figure 13 Shows a schematic structural diagram of the optical lens 10 provided by the third embodiment. Among them, the propagation path of light in the optical lens 10 is exemplarily shown by lines. It should be noted that the illustrated light propagation path is the light propagation path simulated under ideal conditions, for reference only 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.

[0215] Figure 14 Shows the axial chromatic aberration curve graph of the optical lens 10 provided by the third embodiment. Specifically, Figure 14Shows the axial chromatic aberration curve of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the optical lens 10 provided by the third embodiment, which can also be called the spherical aberration curve. Among them, the ordinate represents the normalized pupil coordinate, and the abscissa represents the chromatic aberration in the axial direction. The unit of chromatic aberration is millimeters. Refer to Figure 14 As shown, the axial chromatic aberration of each wavelength in the third embodiment can be controlled within a very small range.

[0216] Figure 15 Shows the optical distortion curve of the optical lens 10 provided by the third embodiment. Among them, it shows the optical distortion curve of light with a wavelength of 555 nm after passing through the optical lens 10 of the third embodiment, 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. Among them, the ordinate represents the image height of the light ray, and the abscissa represents the distortion value. The distortion value is specifically the ratio between the actual shape and the ideal shape (percentage value, unit: %). Refer to Figure 15 As shown, the optical lens 10 in the third embodiment can control the optical distortion within 3%. The optical distortion within this range is difficult to be identified by the naked eye, that is, the optical lens 10 can obtain a higher-quality imaging effect.

[0217] Thus, it can be seen that in the third embodiment, each lens of the optical lens 10 plays different refractive roles and cooperates with each other, and an optical lens 10 with good imaging quality and a smaller overall optical length can be obtained. Specifically, the first lens L1 has a good light-gathering effect and a smaller axial thickness, the second lens L2 can adjust the light ray, the third lens L3 can play a good light-converging role, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L6 can effectively correct the system spherical aberration, reduce the distortion of the edge field of view, and correct astigmatism. There is a smaller gap between the sixth lens L6 and the seventh lens L7, so that the optical lens 10 has a good imaging effect. The overall optical length TTL of the optical lens 10 is controlled at 11.324 mm. The overall optical length of the optical lens 10 is small, and the space required for the optical lens 10 to be arranged on the terminal 1000 is small, which is convenient for realizing the thinning of the terminal 1000.

[0218] As Figure 16As shown, in the fourth embodiment of the present application, along the direction from the object side to the image side, there are sequentially arranged a stop STO, a first lens L1 with a positive focal power, a second lens L2 with a negative focal power, a third lens L3 with a negative focal power, a fourth lens L4 with a positive focal power, a fifth lens L5 with a negative focal power, a sixth lens L6 with a positive focal power, a seventh lens L7 with a negative focal power, an infrared filter IR, and an imaging surface IMA. The specific design parameters in the fourth embodiment are as follows, and the meanings of the parameters refer to the relevant descriptions in the first embodiment.

[0219] The sag of the edge of the image side surface of the third lens L3 satisfies: sag = 0.462 mm;

[0220] 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;

[0221] The radius of curvature R12 of the image side surface of the sixth lens L6 satisfies: R12 = -2.945;

[0222] 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;

[0223] 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: f×tan(Semi - FOV) = 8.22;

[0224] The maximum half field of view Semi - FOV of the optical lens 10 satisfies: Semi - FOV = 41.2°;

[0225] 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;

[0226] 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.

[0227] Based on the design parameters of the fourth embodiment, the basic parameters of the optical lens 10 in the fourth embodiment are as shown in Table 4A below.

[0228] Table 4A. Basic parameters of the optical lens in the fourth embodiment

[0229] System focal length f 9.325 mm Aperture value F 1.485 Maximum semi-field of view Semi-FOV 41.3° Maximum image height IH 16.6 mm Total optical length TTL 11.39 mm Design wavelength 650 nm, 610 nm, 555 nm, 510 nm, 470 nm

[0230] Based on the design parameters of the fourth embodiment, the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical lens 10 in the fourth embodiment are as shown in Table 4B below.

[0231] Table 4B, the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical lens.

[0232]

[0233]

[0234] Based on the design parameters of the fourth embodiment, the conic coefficients and aspheric coefficients of each lens in the optical lens 10 in the fourth embodiment are shown in Table 4C below.

[0235] Table 4C, the conic coefficients and aspheric coefficients of each lens in the optical lens.

[0236]

[0237]

[0238] As can be seen from Table 4C, the first lens L1 to the seventh lens L7 altogether contain 14 aspheric surfaces. Based on the conic coefficient K and the i-th order aspheric coefficient Ai provided in Table 4C, the aspheric surface profiles of each lens in the fourth embodiment can be obtained.

[0239] In some embodiments, all even-order aspheric surface profiles z can be defined by, but not limited to, the following aspheric formula:

[0240]

[0241] where z is the sag of the aspheric surface, r is the radial coordinate of the aspheric surface, c is the vertex spherical curvature of the aspheric surface, K is the conic coefficient, and Ai represents the i-th order aspheric coefficient.

[0242] Figure 16 Fig. shows a schematic structural diagram of the optical lens 10 provided by the fourth embodiment. Among them, the schematic structural diagram of the optical lens 10 is a simulation image obtained by the above aspheric formula.

[0243] Figure 17 Fig. shows a schematic structural diagram of the optical lens 10 provided by the fourth embodiment. Among them, the propagation path of light in the optical lens 10 is exemplarily shown by lines. It should be noted that the illustrated light propagation path is the light propagation path simulated under ideal conditions, for reference only 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.

[0244] Figure 18 Fig. shows the axial chromatic aberration curve graph of the optical lens 10 provided by the fourth embodiment. Specifically, Figure 18The axial chromatic aberration curve of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm after passing through the optical lens 10 provided by the fourth embodiment is shown. Among them, the vertical coordinate represents the normalized pupil coordinate, the horizontal coordinate represents the chromatic aberration in the axial direction, and the unit of chromatic aberration is millimeter. Refer to Figure 18 As shown, the axial chromatic aberration of each wavelength in the fourth embodiment can be controlled within a very small range.

[0245] Figure 19 The optical distortion curve graph of the optical lens 10 provided by the fourth embodiment is shown. Among them, the optical distortion curve graph of light with 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. Among them, the vertical coordinate represents the incident angle of the light ray; the horizontal coordinate represents the distortion value, and the distortion value is specifically the ratio between the actual shape and the ideal shape (percentage value, unit: %). Refer to Figure 19 As shown, the optical distortion of the optical lens 10 in the fourth embodiment can be controlled within 3%, and the optical distortion within this range is difficult to be identified by the naked eye. That is, the optical lens 10 can obtain a high-quality imaging effect.

[0246] It can be seen from this that in the fourth embodiment, each lens of the optical lens 10 plays different refractive roles and cooperates with each other, and an optical lens 10 with good imaging quality and a smaller overall optical length can be obtained. Specifically, the first lens L1 has a good light-gathering effect and a smaller axial thickness, the second lens L2 can adjust the light ray, the third lens L3 can play a good light-converging role, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L6 can effectively correct the spherical aberration of the system, reduce the distortion of the edge field of view and correct the astigmatism. There is a smaller gap between the sixth lens L6 and the seventh lens L7, so that the optical lens 10 has a good imaging effect. The overall optical length TTL of the optical lens 10 is controlled within 11.39 mm. The overall optical length of the optical lens 10 is small, and the space required for the optical lens 10 to be arranged on the terminal 1000 is small, which is convenient for realizing the thinning of the terminal 1000.

[0247] As Figure 20 shown, in the fifth embodiment of the present application, along the direction from the object side to the image side, a stop STO, a first lens L1 with a positive focal power, a second lens L2 with a negative focal power, a third lens L3 with a positive focal power, a fourth lens L4 with a positive focal power, a fifth lens L5 with a negative focal power, a sixth lens L6 with a positive focal power, a seventh lens L7 with a negative focal power, an infrared filter IR, and a photosensitive surface IMA are arranged in sequence. The specific design parameters in the fourth embodiment are as follows, and the meanings of each parameter refer to the relevant description in the first embodiment.

[0248] The sag of the edge of the image side of the third lens L3 satisfies: sag = 0.3248 mm;

[0249] 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;

[0250] The radius of curvature R12 of the image side of the sixth lens L6 satisfies: R12 = -3.315;

[0251] 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;

[0252] The system focal length f of the optical lens 10 and the maximum semi-field angle Semi-FOV of the optical lens 10 satisfy: f × tan(Semi-FOV) = 7.806;

[0253] The maximum semi-field angle Semi-FOV of the optical lens 10 satisfies: Semi-FOV = 40.56°;

[0254] 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;

[0255] 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.

[0256] Based on the design parameters of the fifth embodiment, the basic parameters of the optical lens 10 in the fifth embodiment are shown in Table 5A below.

[0257] Table 5A, Basic parameters of the optical lens in the fifth embodiment

[0258] System focal length f 8.45 mm Aperture value F 1.38 Maximum semi-field of view Semi-FOV 40.56° Maximum image height IH 16.6 Total optical length TTL 10.82 mm Design wavelength 650 nm, 610 nm, 555 nm, 510 nm, 470 nm

[0259] Based on the design parameters of the fifth embodiment, the radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical lens 10 in the fifth embodiment are shown in Table 5B below.

[0260] Table 5B, Radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical lens.

[0261]

[0262] 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.

[0263] Table 5C. Conic coefficients and aspheric coefficients of each lens in the optical lens.

[0264]

[0265]

[0266] 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.

[0267] In some embodiments, all even-order aspheric surface types z can be defined using, but not limited to, the following aspheric formula:

[0268]

[0269] 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.

[0270] Figure 20 A schematic structural diagram of the optical lens 10 provided in the fifth embodiment is shown, wherein the schematic structural diagram of the optical lens 10 is a simulation image obtained by the above-mentioned aspheric formula.

[0271] Figure 21 A schematic structural diagram of the optical lens 10 provided in the fifth embodiment is shown, 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.

[0272] Figure 22 FIG. 1 shows an axial chromatic aberration curve of the optical lens 10 provided in the fifth embodiment. Specifically, Figure 20 The axial chromatic aberration curves, also called spherical aberration curves, of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm respectively after passing through the optical lens 10 provided in the fifth embodiment are shown. The ordinate represents the normalized pupil coordinate, the abscissa represents the chromatic aberration in the axial direction, and the unit of chromatic aberration is millimeters. Figure 20 As shown, the axial chromatic aberration of each wavelength in the fifth embodiment can be controlled within a very small range.

[0273] Figure 23The optical distortion curve graph of the optical lens 10 provided by the fifth embodiment is shown. Among them, the optical distortion curve graph of the light with a wavelength of 555 nm after passing through the optical lens 10 of the fifth 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. Among them, the ordinate represents the image height, and the abscissa represents the distortion value. The distortion value is specifically the ratio between the actual shape and the ideal shape (percentage value, unit: %). Refer to Figure 23 As shown, the optical lens 10 in the fifth embodiment can control the optical distortion within 3%. The optical distortion within this range is difficult to be identified by the naked eye. That is, the optical lens 10 can obtain a higher-quality imaging effect.

[0274] It can be seen that in the fifth embodiment, each lens of the optical lens 10 plays different refractive roles and cooperates with each other, and an optical lens 10 with good imaging quality and a smaller overall optical length can be obtained. Specifically, the first lens L1 has a good light-gathering effect and a smaller axial thickness. The second lens L2 can adjust the light. The third lens L3 can play a good light-converging role. The fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L6 can effectively correct the spherical aberration of the system, reduce the distortion of the edge field of view, and correct the astigmatism. There is a smaller gap between the sixth lens L6 and the seventh lens L7, so that the optical lens 10 has a good imaging effect. The overall optical length TTL of the optical lens 10 is controlled within 10.82 mm. The overall optical length of the optical lens 10 is small, and the space required for arranging the optical lens 10 on the terminal 1000 is small, which is convenient for realizing the thinning of the terminal 1000.

[0275] The above is only some embodiments and implementation manners of the present application. The protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An optical lens (10), characterized in that, The optical lens (10) includes at least seven lenses (L). Each lens (L) includes an object side facing the object side and an image side facing the image side. 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 along the direction from the object side to the image side, where: The first lens (L1) has a positive optical power. The refractive index of the first lens (L1) is greater than or equal to 1.

6. The sag height at the edge of the image side of the third lens (L3) is greater than 0.3 mm, and the sag height at the edge of the object side of the third lens (L3) is greater than zero.

2. The optical lens (10) according to claim 1, wherein, The back focal length BFL of the optical lens (10) and the total optical length TTL of the optical lens 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 1-3, 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 1-4, 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 1-5, 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 1-6, characterized in that, The system focal length f of the optical lens (10) and the maximum semi-field angle Semi-FOV of the optical lens (10) satisfy the following relationship: f × tan(Semi-FOV) ≥ 7.5 mm.

8. The optical lens (10) according to any one of claims 1-7, characterized in that, The maximum semi-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 1-8, characterized in that, The paraxial region of the sixth lens (L6) has a positive optical power, and the radius of curvature of the center of the image side of the sixth lens (L6) is less than 0.

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

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

12. An imaging module (100), characterized in that, It includes a photosensitive element (20) and the optical lens (10) as described in any one of claims 1-11. The photosensitive element (20) is located on the image side of the optical lens (10).

13. The imaging module (100) according to claim 12, wherein The imaging module (100) has a first state and a second state. 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. 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; wherein, the second distance is greater than the first distance.

14. A terminal (1000), characterized in that, Comprising an image processor (300) and an imaging module (100) as claimed in claim 12 or 13, the image processor (300) is communicatively connected to the imaging module (100), the imaging module (100) is configured to acquire image data and input the image data into the image processor (300), and the image processor (300) is configured to process the image data output therefrom.

Images