Optical lens, camera module and electronic device

Abstract

This application relates to optical lenses, camera modules, and electronic devices. The optical lens comprises a first group, a second group, and a third group, with the optical power of the first group being opposite to that of the second group. The first group includes at least two lenses. The second group includes at least one lens. The third group includes an optical folding element. Light rays emitted from the first group pass sequentially through the second group and the optical folding element, undergoing multiple reflections within the optical folding element. The second group is a focusing lens group. During the focusing process of the optical lens from a distant to a near scene, the distance between the first and second groups increases, while the distance between the second and third groups decreases. The optical lens satisfies the following: FOV < 50°, where FOV is the field of view of the optical lens in the first focusing state, and the working object distance in the first focusing state is the maximum working object distance of the optical lens. The optical lens of the embodiments of this application is characterized by miniaturization and can achieve shooting in both distant and macro states with good image quality.

Description

[0001] This application is a divisional application. The original application has the application number 202410934252.5 and the original application date is July 12, 2024. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of shooting equipment technology, and in particular to an optical lens, camera module and electronic device. Background Technology

[0003] In daily life, electronic devices such as mobile phones and tablets are equipped with camera modules to facilitate taking photos anytime, anywhere, bringing convenience and enjoyment to people's lives. Currently, users have increasingly higher demands for the functionality and image quality of the optical lenses in camera modules. For example, they require lenses to be able to capture distant objects, achieving telephoto shooting; they require lenses to be able to capture close-up objects, achieving close-up shots; and they require miniaturization to reduce the space occupied by electronic devices. However, the optical lenses in current conventional camera modules are relatively large and mainly focus on shooting at larger object distances. When shooting at smaller object distances, the optical lens usually requires a large focusing distance to achieve focus, resulting in weaker focusing capabilities and poorer image quality. Summary of the Invention

[0004] This application provides an optical lens, a camera module, and an electronic device. Through structural design of the optical lens, this application enables both long-distance and macro photography, and features miniaturization.

[0005] In a first aspect, embodiments of this application provide an optical lens. The optical lens includes a first group, a second group, and a third group, where the optical power of the first group is opposite to that of the second group. The first group includes at least two lenses. The second group includes at least one lens. The third group includes an optical folding element, and light rays exiting the first group pass sequentially through the second group and the optical folding element, undergoing multiple reflections within the optical folding element. The second group is a focusing lens group; during the focusing process of the optical lens from a distant to a near scene, the distance between the first and second groups increases, and the distance between the second and third groups decreases. The optical lens satisfies the following relationship: FOV < 50°, where FOV is the field of view angle of the optical lens in a first focusing state, and the working object distance in the first focusing state is the maximum working object distance of the optical lens. The working object distance of the optical lens is understood as the distance at which the optical lens can achieve effective imaging that meets the optical design requirements. During focusing, the second group can move along the optical axis while the first group remains stationary, achieving focusing. Alternatively, both the first and second groups can move along the optical axis to achieve focusing. Light can undergo at least two reflections within the optical folding element.

[0006] The optical lens of this application embodiment features miniaturization, telephoto capability, and macro imaging. The second group in this application embodiment is a focusing lens group, which enhances the focusing capability of the optical lens and facilitates macro photography. By rationally configuring the optical power of the first and second groups and setting them to have opposite optical power, this application embodiment facilitates focusing and macro focusing, reduces the focusing distance, strengthens focusing capability, and improves the overall image quality of the optical system in close-up imaging. It also increases the amount of light entering the system, promotes macro imaging, and balances the difference in image quality between distant and close-up shots, providing good image quality and high image clarity when shooting objects at different distances. This application, by setting an optical folding element, facilitates multiple folds of light, increases the optical path, reduces the size of the optical lens, and achieves miniaturization. By setting the FOV < 50°, this application embodiment enables telephoto shooting with the optical lens. The light can be reflected multiple times within the optical folding element, which is beneficial for achieving both telephoto capability and miniaturization of the optical lens.

[0007] The optical lens of this application can not only perform long-distance shooting, but also close-up macro shooting. The optical lens of this application has good shooting effect on subjects from telephoto to macro. In particular, when performing macro shooting on objects with an object distance of less than 200mm, the optical lens of this application has a small focusing distance and high image quality.

[0008] In one possible implementation, the first group is a fixed lens group, and during the focusing process of the optical lens from a distant to a near view, the second group moves along the optical axis to the image side; or, the first group is a focusing lens group, and during the focusing process of the optical lens from a distant to a near view, the first group moves towards the object side along the optical axis while the second group moves along the optical axis to the image side. This embodiment of the application can achieve focusing by moving the second group or by moving both the first and second groups, which can enhance the focusing capability of the optical lens and is beneficial for achieving macro photography.

[0009] In one possible implementation, the second group includes at least one lens with an Abbe number greater than 15. By including at least one lens with an Abbe number greater than 15 in the second group, this embodiment of the application helps to reduce chromatic aberration in the optical lens and improve image quality.

[0010] In one possible implementation, the maximum aperture DG1 of the first group and the maximum aperture DG2 of the second group satisfy the following relationship: DG1 / DG2>1.1. The maximum aperture of the first group is the aperture size of the actual passage area of ​​light in the first group. The maximum aperture of the second group is the aperture size of the actual passage area of ​​light in the second group. By setting DG1 / DG2>1.1, this embodiment of the application is beneficial for correcting large field-of-view aberrations and improving the imaging quality of the optical lens.

[0011] In one possible implementation, the optical lens has a first working object distance DM, which is less than or equal to 1m. The optical lens also has a second focusing state, where the working object distance of the second focusing state is the first working object distance DM. During the switching process from the first focusing state to the second focusing state, the change in distance between the first group and the second group is VM. The optical lens satisfies the following relationship: VM > 1 / DM. This embodiment of the application, by setting VM > 1 / DM, helps to reduce the focusing sensitivity of the optical lens and improve focusing quality.

[0012] In one possible implementation, the maximum aperture FD1 of the lens with negative optical power in the first group and the maximum aperture DG2 of the second group satisfy the following relationship: FD1 / DG2>1.05. By setting FD1 / DG2>1.05, this embodiment of the application helps to reduce large field-of-view aberrations and improve the imaging quality of the optical lens.

[0013] In one possible implementation, during the focusing process of the optical lens from a distant to a close-up, the third group moves away from the object side along the optical axis. Focusing is achieved by moving the third group along the optical axis.

[0014] In one possible implementation, the first and second groups move in opposite directions during focusing, which helps to shorten the focusing stroke, reduce the design difficulty of the driving components that drive the first or second group to move, and reduce the size of the driving components, thereby miniaturizing the optical lens and achieving good imaging quality in macro photography.

[0015] In one possible implementation, the second group includes at least one lens with negative optical power. By setting at least one lens in the second group to have negative optical power, the focusing distance can be reduced, focusing capability can be strengthened, and good image quality and high image sharpness can be achieved when shooting objects at different distances.

[0016] In one possible implementation, the first group has positive optical power, and the second group has negative optical power. The first group, with its positive optical power, is used for beam converging, resulting in a smaller diameter beam entering the second group. The aperture of the second group no longer becomes the maximum limitation on the light-gathering aperture, which is beneficial for miniaturization and large aperture design of the optical lens. It effectively increases the light-gathering aperture, achieving a smaller aperture number and enhancing focusing capability, which is beneficial for macro photography. The negative optical power of the second group reduces the focusing distance and strengthens focusing capability. A reasonable configuration of the optical power of the first and second groups is beneficial for achieving miniaturization, large aperture, and telephoto capabilities in the optical lens, facilitating focusing from distant to close-up scenes, and improving the image quality of the optical lens.

[0017] In one possible implementation, the first group includes a first lens and a second lens, and the second group includes a third lens. The first lens, the second lens, and the third lens are arranged sequentially. The first lens has positive optical power, the second lens has negative optical power, and the third lens has negative optical power. By rationally configuring the optical powers of the first, second, and third lenses, it is beneficial to achieve features such as miniaturization, large aperture, and telephoto capabilities in the optical lens. This also facilitates the focusing process from distant to near objects and improves the image quality of the optical lens.

[0018] In one possible implementation, the focal length F1 of the first group of the optical lens and the effective focal length EFL of the optical lens in the first focusing state satisfy the following relationship: F1 / EFL ≤ 0.95. By limiting the appropriate range of F1 / EFL, the optical power of the first group can be reasonably configured, which is beneficial for shortening the focusing distance, improving focusing capability, enabling macro shooting, and providing good image quality and high image sharpness when shooting objects at different distances. In addition, limiting F1 / EFL ≤ 0.95 is beneficial for reducing the aperture number, enabling a large aperture design, increasing the light transmission diameter, and ensuring good image quality.

[0019] In one possible implementation, the focal length F2 of the second group of the optical lens and the effective focal length EFL of the optical lens in the first focusing state satisfy the following relationship: F2 / EFL > -5. In this embodiment, a reasonable design of the F2 / EFL ratio range helps to reduce the focusing distance and improve focusing capability. Furthermore, by designing F2 / EFL within a suitable range, the optical lens can balance the image quality differences between distant and close-up shots with relatively low assembly sensitivity, resulting in more uniform image quality.

[0020] In one possible implementation, the first group includes at least one lens with positive optical power, wherein the ratio of the focal length of the at least one lens with positive optical power in the first group to the effective focal length of the optical lens is less than 1. By setting the ratio of the focal length of the at least one lens with positive optical power in the first group to the effective focal length of the optical lens to be less than 1, it can be ensured that the first group, with a smaller number of lenses, can provide sufficient optical power for the optical lens. This reduces the size of the first group, which is beneficial for macro photography and also facilitates the telephoto and miniaturization design of the optical lens.

[0021] In one possible implementation, the optical lens satisfies the following relationship: ImgH > 2mm, where ImgH is the maximum image height of the optical lens. This embodiment of the application, by limiting the range of ImgH, enables the optical lens to have a large target area, which is beneficial for achieving higher imaging magnification and improving resolution.

[0022] In one possible implementation, the first group includes at least one lens with an Abbe number less than 40. By limiting at least one lens in the first group to have an Abbe number less than 40, it is beneficial to reduce chromatic aberration in the optical lens, thereby enabling the optical lens to have good image quality.

[0023] In one possible implementation, the optical lens satisfies the following relationship: Fno < 5, where Fno is the aperture number of the optical lens. A small Fno indicates a large aperture, and a large Fno indicates a small aperture. In this embodiment, by setting Fno < 5, the optical lens has the characteristic of a large aperture.

[0024] In one possible implementation, the optical path length of the light rays passing through the optical axis of the second group in the optical folding element is greater than twice the maximum image height, which is beneficial for multiple folding of the light rays, increasing the optical path length, reducing the volume of the optical lens, and realizing the miniaturization of the optical lens.

[0025] In one possible implementation, the first group includes a deflection element located on the object side of the optical lens, used to change the direction of light entering the first group. The deflection element allows the propagation direction of light in the first group to differ from the direction of light entering the deflection element, thereby providing greater flexibility in the placement, angle, and spatial arrangement of the optical lens.

[0026] Secondly, embodiments of this application provide a camera module, which includes a photosensitive element and an optical lens as described in any of the foregoing embodiments, with the photosensitive element located on the image side of the optical lens. The camera module in this application embodiment can achieve both long-distance and macro photography and is characterized by its miniaturization.

[0027] Thirdly, embodiments of this application also provide an electronic device, which includes an image processor and the aforementioned camera module. The image processor is communicatively connected to the camera module and is used to acquire image data from the camera module and process the image data. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0029] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the camera module provided in the first embodiment of this application in a working state; Figure 3 This is a schematic diagram of the camera module provided in the first embodiment of this application in another working state; Figure 4 This is a characterization diagram of the optical performance of the optical lens in the first embodiment of this application during telephoto shooting; Figure 5 This is a characterization diagram of the optical performance of the optical lens in the first embodiment of this application at a macro object distance; Figure 6 This is a schematic diagram of the camera module provided in the second embodiment of this application in a working state; Figure 7 This is a schematic diagram of the camera module provided in the second embodiment of this application in another working state; Figure 8 This is a characterization diagram of the optical performance of the optical lens in the second embodiment of this application during telephoto shooting; Figure 9 This is a characterization diagram of the optical performance of the optical lens in the second embodiment of this application at a macro object distance; Figure 10 This is a schematic diagram of the camera module provided in the third embodiment of this application in a working state; Figure 11 This is a schematic diagram of the camera module provided in the third embodiment of this application in another working state; Figure 12 This is a characterization diagram of the optical performance of the optical lens in the third embodiment of this application during telephoto shooting; Figure 13 This is a characterization diagram of the optical performance of the optical lens in the third embodiment of this application at a macro object distance; Figure 14 This is a schematic diagram of the camera module provided in the fourth embodiment of this application in a working state; Figure 15 This is a schematic diagram of the camera module provided in the fourth embodiment of this application in another working state; Figure 16 This is a characterization diagram of the optical performance of the optical lens in the fourth embodiment of this application during telephoto shooting; Figure 17 This is a characterization diagram of the optical performance of the optical lens in the fourth embodiment of this application at a macro distance. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] It should be understood that the terms "first," "second," etc., used in this application are for distinguishing purposes only and should not be construed as indicating or implying relative importance or order.

[0033] In the description of this application, the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, a mating connection, or an integral connection; those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of an optical system to deflect light rays.

[0036] A lens or lens group with positive optical power, having a positive focal length, and having the effect of converging light.

[0037] A lens or lens group with negative optical power has a negative focal length and has the effect of diverging light.

[0038] Focal length, also known as focal length, is a measure in optical systems of the convergence or divergence of light. It refers to the perpendicular distance from the optical center of a lens or lens group to the focal plane when a distant object is projected into a sharp image. For thin lenses, the focal length is the distance from the lens center to the image plane; for thick lenses or lens groups, the focal length equals the effective focal length, which is the distance between the rear principal plane of the lens or lens group and the image plane. For zoom lenses, the effective focal length changes during zooming.

[0039] The object side is defined as the side where the scene to be imaged is located, with the optical element as the boundary.

[0040] In this embodiment, the image side is defined by an optical element, which includes a lens or an optical folding element. For a lens, the side containing the image of the object to be imaged is the image side. For an optical folding element, the element functions to fold the optical path, and the object to be imaged and its image can be located on the same or different sides of the optical folding element in physical space. In other words, the object side and image side of the optical folding element are located on the same or different sides of the element in physical space.

[0041] The object side is the side where the object is located, with the lens as the boundary. The surface of the lens closest to the object side is called the object side surface, or object plane.

[0042] The image side is the side where the image of the object is located, with the lens as the boundary. The surface of the lens closest to the image side is called the image side surface, or image plane.

[0043] The imaging plane is the surface on which light rays pass through the lenses in an optical lens in sequence to form an image.

[0044] The aperture is a device used to control the amount of light passing through the lens and entering the sensor inside the camera body; it is usually located inside the lens.

[0045] Aperture number, also known as F-number (Fno), is a relative value derived from the lens's focal length and entrance pupil diameter (the reciprocal of the relative aperture). A smaller aperture number allows more light to enter the lens in the same unit of time. A larger aperture number results in a shallower depth of field, blurring the background and creating an effect similar to a telephoto lens.

[0046] The Abbe number, also known as the dispersion coefficient, is the ratio of the difference in refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0047] Aberrations: The paraxial region of an optical system has the properties of an ideal optical system, where paraxial rays emitted from a point on an object intersect the image plane at a single point (i.e., the paraxial image point). However, in reality, light rays passing through different apertures of a lens rarely intersect perfectly at a single point, but rather deviate from the position of the paraxial image point. These differences are collectively referred to as aberrations.

[0048] The optical axis is a line that passes perpendicularly through the center of an ideal lens. When light rays parallel to the optical axis enter a convex lens, the ideal convex lens should have all the light rays converging at a single point behind the lens; this point is called the focal point. As light propagates along the optical axis, its direction of propagation remains unchanged.

[0049] Axial spherical aberration, also known as longitudinal chromatic aberration, positional chromatic aberration, or axial aberration, occurs when a beam of light parallel to the optical axis converges at different positions after passing through a lens. This aberration is called positional chromatic aberration or axial chromatic aberration because the lens images different wavelengths of light at different positions, causing the image-side focal planes of different colors of light to not coincide in the final image, resulting in the dispersion of polychromatic light.

[0050] Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical system relative to the object itself. Distortion occurs due to the spherical aberration of the aperture. The height of the intersection point between the principal ray from different fields of view and the Gaussian image plane is not equal to the ideal image height; this difference is the distortion. Therefore, distortion only changes the imaging position of an off-axis object point on the ideal plane, causing a distortion in the image shape, but it does not affect the image's sharpness.

[0051] Astigmatism occurs because the object point is not on the optical axis of the optical system, and the emitted beam of light has an angle with the optical axis. After refraction by a lens, the convergence points of the meridional and sagittal beams are not at the same point. That is, the beam cannot be focused on a single point, resulting in an unclear image, hence astigmatism. The meridional and sagittal beams are the names of beams in two perpendicular planes within a rotationally symmetric optical system.

[0052] Field curvature refers to the difference in optical axis between the position of the sharpest image point after rays from the off-center field of view pass through an optical lens assembly and the position of the sharpest image point in the central field of view. When a lens has field curvature, the intersection of the entire beam does not coincide with the ideal image point. Although a sharp image point can be obtained at each specific point, the entire image plane is a curved surface.

[0053] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. The solutions described in this application are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In the description of the embodiments of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0054] This application provides an optical lens, a camera module using the optical lens, and an electronic device including the camera module. The optical lens includes a first group, a second group, and a third group, wherein the optical power of the first group is opposite to that of the second group; the first group includes at least two lenses; the second group includes at least one lens; the third group includes a light folding element, and light rays emanating from the first group pass sequentially through the second group and the light folding element, with the light rays undergoing multiple reflections within the light folding element; the second group is a focusing lens group, and during the focusing process of the optical lens from a distant to a near scene, the distance between the first group and the second group increases, and the distance between the second group and the third group decreases; the optical lens satisfies the following relationship: FOV < 50°, where FOV is the field of view angle of the optical lens in the first focusing state, and the working object distance in the first focusing state is the maximum working object distance of the optical lens. The optical lens of this application embodiment can achieve infinity and macro imaging, has a short focusing stroke, strong focusing capability, and features miniaturization and low shoulder height.

[0055] It's important to clarify that the working object distance of an optical lens can be understood as the effective imaging capability of the lens at that working object distance, meeting the optical design requirements. Taking a zoom lens as an example, the actual object distance of the subject lies within the working object distance of the lens. The lens can adjust its focal length to adapt to the actual object distance, thus achieving effective imaging. Clearly, compared to fixed-focus lenses, zoom lenses have a wider range of working object distances, making them suitable for a wider range of applications.

[0056] Please see Figure 1 , Figure 1 The diagram shown is a structural schematic of an electronic device 1000 according to this application. The electronic device 1000 can be a mobile phone, tablet, wearable device, or other device with photographic or video recording capabilities. In the embodiments of this application, a mobile phone is used as an example for description. Figure 1 Taking the electronic device 1000 as an example, which may include a camera module 100, the number of camera modules 100 may also be two or three, etc., and this application embodiment does not limit this.

[0057] Electronic device 1000 includes a camera module 100 and an image processor 200 communicatively connected to the camera module 100. The camera module 100 acquires image data and inputs it into the image processor 200, which then processes the acquired image data. The communication connection between the camera module 100 and the image processor 200 can include data transmission via electrical connections such as wiring, or via coupling. It is understood that the camera module 100 and the image processor 200 can also achieve communication through other methods capable of data transmission.

[0058] The function of the image processor 200 is to optimize the digital image signal through a series of complex mathematical algorithms, and finally transmit the processed signal to the display for display. The image processor 200 can be an image processing chip or a digital signal processing chip. Its role is to transmit the data obtained by the photosensitive chip to the central processing unit in a timely and fast manner and refresh the photosensitive chip. Therefore, the quality of the image processor 200 chip directly affects the image quality (such as color saturation, sharpness, etc.).

[0059] In some embodiments, the electronic device 1000 includes a display screen (not shown), which is a module used by the electronic device 1000 to display images. The display screen includes, but is not limited to, flexible displays, rigid displays, bendable displays, stretchable displays, etc. Types of displays include, but are not limited to, liquid crystal displays, light-emitting diode displays, organic light-emitting diode displays, etc. The display screen is located on the front of the electronic device 1000, which is also the side that the user faces when normally using the electronic device 1000. A camera module 100 can be located on the side where the display screen is located, serving as a front-facing camera of the electronic device 1000. The camera module 100 can also be located on the back of the electronic device 1000, serving as a rear-facing camera. Both the front-facing and rear-facing cameras can be used for selfies or for the photographer to capture images of other objects.

[0060] In some embodiments, the electronic device 1000 may include a housing 300 having a accommodating space capable of housing an image processor 200, a battery, etc., with at least a portion of the camera module 100 disposed within the accommodating space. The housing 300 may have an opening, with one end of the camera module 100 disposed within the opening to allow external light to enter the camera module 100, thereby enabling the camera module 100 to function as a rear camera for capturing images. In other embodiments, the camera module 100 may also be a front-facing camera.

[0061] In some embodiments, the electronic device 1000 may include an analog-to-digital converter 400, which is connected between the camera module 100 and the image processor 200. The analog-to-digital converter 400 is used to convert the signal generated by the camera module 100 into a digital image signal and transmit it to the image processor 200. The image processor 200 then processes the digital image signal and finally displays the image or video through a display screen or monitor.

[0062] In some embodiments, the electronic device 1000 includes a memory (not shown) communicatively connected to an image processor 200. The image processor 200 processes the digital image signal before transmitting the image to the memory, so that the image can be retrieved from the memory and displayed on the screen when needed later. In some embodiments, the image processor 200 also compresses the processed digital image signal before storing it in the memory to save memory space.

[0063] Understandable Figure 1 The installation position of the camera module 100 in the illustrated embodiment of the electronic device 1000 is merely illustrative, and this application does not strictly limit the installation position of the camera module 100. In some other embodiments, the camera module 100 may also be installed in other locations of the electronic device 1000. For example, the camera module may also be located in the upper right corner or the upper middle of the housing 300.

[0064] In some other embodiments, the camera module 100 may not be mounted on the main body of the mobile phone, but rather on a structural component that is movable or rotatable relative to the mobile phone. For example, the camera module 100 may extend, retract, or rotate from the main body of the mobile phone along with the structural component. This application does not limit the installation position of the camera module 100. The position, size, dimensions, etc., of the camera module 100 described in this application are merely illustrative and can be adjusted as needed.

[0065] like Figure 2 As shown, Figure 2This is a schematic diagram of the camera module provided in the first embodiment of this application in one working state. The camera module 100 may include an optical lens 10 and a photosensitive element 20. The photosensitive element 20 may be located on the image side of the optical lens 10. In this embodiment, the working process of the camera module 100 in the electronic device 1000 is as follows: the light reflected from the subject enters the optical lens 10 to generate an optical image, which is projected onto the photosensitive surface of the photosensitive element 20. The photosensitive element 20 converts the optical image into an electrical signal, i.e., an analog signal, and transmits the analog signal to the analog-to-digital converter 400, so that the analog-to-digital converter 400 converts it into a digital image signal and sends it to the image processor 200. The image processor can run to convert the original image captured by the camera module 100 to form image information, and transmit the processed image information to the display screen for display of the image or video.

[0066] The photosensitive element 20 (also known as an image sensor) is a semiconductor chip containing hundreds of thousands to millions of photodiodes on its surface, which generate electrical charges when exposed to light. The photosensitive element 20 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. CCDs are made using a highly sensitive semiconductor material that converts light into electrical charges. CCDs consist of many photosensitive units, typically measured in megapixels. When light shines on the surface of a CCD, each photosensitive unit reflects a charge onto the component; the signals generated by all the photosensitive units are added together to form a complete image. CMOS devices primarily utilize semiconductors made of silicon and germanium, allowing N-type (negative) and P-type (positive) semiconductors to coexist on the CMOS. The current generated by these complementary effects can be recorded and interpreted by the image sensor as an image.

[0067] In some embodiments, the optical lens 10 may include a drive (not shown), which may be a motor. For example, the drive may be a voice coil motor. The drive may drive at least a portion of the structure in the optical lens 10 to achieve focusing or zooming functions in order to achieve clear imaging on the photosensitive element 20.

[0068] In some embodiments, the camera module 100 may include a filter 30, which may be located between the optical lens 10 and the photosensitive element 20. Light passing through the optical lens 10 is incident on the filter 30 and, after passing through the filter 30, is imaged on the photosensitive element 20. The filter 30 is used to filter out unwanted wavelengths in the light, preventing the photosensitive element 20 from producing false colors or ripples, thereby improving its effective resolution and color reproduction. For example, the filter 30 may be an infrared filter. In this embodiment, the filter 30 is a separate component. In other embodiments, the filter structure may be omitted, and filtering may be achieved by surface treatment or material treatment of at least one optical element of the optical lens 10. This application does not strictly limit the specific embodiments of the structure or component used to achieve filtering.

[0069] Please refer to the following: Figure 2 and Figure 3 , Figure 3 This is a schematic diagram of the camera module provided in the first embodiment of this application in another working state. Figure 2 The image in the middle shows the camera module 100 of the first embodiment of this application in a distant view shooting state during telephoto shooting. Figure 3 This is the close-up working state of the camera module 100 during macro shooting according to the first embodiment of this application.

[0070] In this embodiment, the optical lens 10 includes a first group 11, a second group 12, and a third group 13 arranged sequentially along the optical axis. Light entering the optical lens 10 passes through the first group 11, the second group 12, and the third group 13 sequentially. The first group 11 and the second group 12 have opposite optical powers. For example, the first group 11 may have a positive optical power and the second group 12 may have a negative optical power, or the first group 11 may have a negative optical power and the second group 12 may have a positive optical power.

[0071] The first group 11 may include at least two lenses, which is beneficial for correcting chromatic aberration. Exemplarily, the first group 11 may include a first lens L1 and a second lens L2 arranged sequentially along the optical axis, with the second lens L2 located between the first lens L1 and the second group 12. It will be understood that in other embodiments, the first group 11 may also include more lenses in addition to the first lens L1 and the second lens L2.

[0072] The second group 12 may include at least one lens. Exemplarily, the second group 12 may include a third lens L3. It is understood that the second group 12 may also include two, three, or four lenses, etc., and this application does not limit this. The second group 12 may be a focusing lens group. It should be noted that a focusing lens group refers to a lens group that can move along the optical axis to achieve zoom. During the movement of the focusing lens group, all lenses within the lens group move, and the spacing between all lenses within the lens group does not change. Exemplarily, in embodiments where the second group 12 includes two or more lenses, the two or more lenses in the second group 12 move simultaneously without changing the spacing between them.

[0073] The third group 13 may include an optical folding element 131. Understandably, light can be reflected multiple times within the optical folding element 131, where multiple times can be understood as at least twice.

[0074] During the focusing process of the optical lens 10 from telephoto to macro photography, the distance between the first group 11 and the second group 12 increases, while the distance between the second group 12 and the third group 13 decreases. For example, the second group 12 can be moved along the optical axis towards the image side of the optical lens 10. Alternatively, when the second group 12 is a focusing lens group and the first group 11 is a focusing lens group, the first group 11 can be moved along the optical axis towards the object side of the optical lens 10, and the second group 12 can be moved along the optical axis towards the image side of the optical lens 10 to increase the distance between the first group 11 and the second group 12 for focusing.

[0075] In this embodiment, the field of view (FOV) of the optical lens 10 in the first focusing state satisfies: FOV < 50°. The working object distance in the first focusing state is the maximum working object distance of the optical lens. Since the working object distance of the optical lens is proportional to the focal length, the optical lens has a maximum focal length in the first focusing state. In other words, the optical lens has a field of view (FOV) of less than 50° when shooting at its maximum focal length. For example, the FOV value can be 45°, 35°, 25°, or 20°, etc. The field of view (FOV) of the optical lens in the first focusing state satisfies the aforementioned relationship, enabling the optical lens 10 of this application to have telephoto characteristics, and to effectively focus in telephoto shooting scenarios to achieve good imaging results.

[0076] This application limits the optical focal length of the first group 11 and the second group 12 to be opposite, limits the third group 13 to include the light folding element 131, the second group 12 to be a focusing lens group, and limits the field of view (FOV) of the optical lens 10 in the infinity working state, so that the optical lens 10 has the characteristics of miniaturization and telephoto, and can have good imaging effect from infinity to macro.

[0077] This embodiment of the application, by setting the first group 11 and the second group 12 to have opposite optical focal lengths, facilitates focusing and macro focusing, reduces focusing distance, enhances focusing capability, improves the overall image quality of the optical system in close-up imaging, increases the amount of light entering the system, promotes macro imaging, and balances the difference in image quality between distant and close-up shooting. In this embodiment, the first group 11 and the second group 12 have opposite optical focal lengths, and only a small change in the distance between the first group 11 and the second group 12 is needed to achieve a large change in the focal length of the optical lens 10, which helps to reduce the focusing distance and enable the optical lens 10 to have good image quality in close-up situations, achieving macro imaging. In this embodiment, the light is folded multiple times within the light folding element 131, which increases the optical path of the light within the optical lens 10 to ensure that the optical lens 10 has a telephoto effect, achieving miniaturization of the optical lens 10 while maintaining a large focal length.

[0078] The optical lens 10 of this application can not only perform long-distance shooting, but also close-up macro shooting. The optical lens 10 of this application has a large effective object distance range and has good shooting effect in both telephoto and macro shooting scenarios. In particular, when performing macro shooting on objects with an object distance of less than 200mm, the optical lens 10 of this application has a small focusing stroke and high image quality.

[0079] In one possible implementation, the first group 11 is a fixed lens group, and the second group 12 moves along the optical axis to the image side during the focusing process of the optical lens 10 from the distant view to the near view.

[0080] In one possible implementation, the first group 11 is a focusing lens group. During the focusing process of the optical lens 10 from a distant scene to a close-up scene, the first group 11 moves towards the object side along the optical axis, while the second group 12 moves towards the image side along the optical axis. In this embodiment, focusing can be achieved by moving the second group 12 or by moving both the first group 11 and the second group 12, which can enhance the focusing capability of the optical lens 10 and facilitate macro photography.

[0081] In some embodiments, the first group 11, the second group 12, and the photosensitive element 20 may be located on the same side of the light folding element 131 in physical space. During focusing, focusing can be achieved by moving the first group 11 and the second group 12 along the optical axis, or by moving only the second group 12 along the optical axis while the first group 11 remains stationary, or by moving the light folding element 131. During the switching of the optical lens 10 from a distant view to a close-up view, the second group 12 may move along the optical axis towards the image side, or the first group 11 may move along the optical axis toward the object side while the second group 12 moves along the optical axis towards the image side, thereby increasing the distance between the first group 11 and the second group 12 to achieve macro imaging.

[0082] In some embodiments, the first group 11 and the second group 12 may be located on different sides of the photosensitive element 20 in physical space from the photosensitive element 131, and the second group 12 may be a focusing group. It is understood that when the first group 11 and the second group 12 are located on different sides of the photosensitive element 20 from the photosensitive element 20, the photosensitive element 131 is located between the first group 11 and the second group 12 and the photosensitive element 20. In this embodiment, focusing can be achieved by moving the second group 12, increasing the distance between the first group 11 and the second group 12, which is beneficial for achieving macro imaging.

[0083] In some embodiments, the first group 11 and the second group 12 move in opposite directions, which shortens the distance that the first group 11 and / or the second group 12 move, facilitating macro imaging and improving the imaging quality of the optical lens 10 at wide object distances (from infinity to macro). Furthermore, since the focusing stroke required by the optical lens 10 is relatively small, it also helps to reduce the size of the driving components that drive the first group 11 or the second group 12, making it easier to miniaturize the camera module 100. The optical lens 10 of this application embodiment can achieve telephoto, miniaturization, and wide object distance imaging from telephoto to macro photography.

[0084] In some embodiments, the second group 12 includes at least one lens with an Abbe number greater than 15. By including at least one lens with an Abbe number greater than 15 in the second group 12, the embodiments of this application benefit from reducing chromatic aberration of the optical lens 10 and improving image quality.

[0085] In some embodiments, during the switching of the optical lens 10 from a distant view to a close-up view, the third group 13 can move away from the object side along the optical axis, which is beneficial for focusing and enables macro photography. Exemplarily, during the switching of the optical lens 10 from a distant view to a close-up view, both the third group 13 and the second group 12 move in a direction away from the first group 11, during which the distance between the third group 13 and the second group 12 decreases. It is understood that the third group 13 may also include a lens, which may be located between the second group 12 and the light folding element 131, or between the light folding element 131 and the imaging plane.

[0086] In one possible implementation, the maximum aperture DG1 of the first group 11 and the maximum aperture DG2 of the second group 12 satisfy the following relationship: DG1 / DG2 > 1.1. Exemplarily, the value of DG1 / DG2 can be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, or 1.9, etc. The maximum aperture of the first group 11 can be understood as the aperture size of the actual passage area of ​​light in the first group 11. The maximum aperture of the second group 12 can be understood as the aperture size of the actual passage area of ​​light in the second group 12. By setting DG1 / DG2 > 1.1, this embodiment of the application is beneficial for correcting large field-of-view aberrations and improving the imaging quality of the optical lens 10.

[0087] In one possible implementation, the optical lens has a first working object distance DM, which is less than or equal to 1m. The optical lens also has a second focusing state, where the working object distance is the same as the first working object distance DM. During the switching from the first focusing state to the second focusing state, the change in distance between the first and second focusing groups is VM. The optical lens satisfies the following relationship: VM > 1 / DM. The object distance DM can be less than or equal to 1m during close-up shooting. This embodiment of the application, by setting VM > 1 / DM, helps to reduce the focusing sensitivity of the optical lens 10 and improve focusing quality. It is understood that in other embodiments, the object distance range during close-up shooting can also be greater than 1m.

[0088] In one possible implementation, the maximum aperture FD1 of the lens with negative optical power in the first group 11 and the maximum aperture DG2 of the second group 12 satisfy the following relationship: FD1 / DG2 > 1.05. Exemplarily, the value of FD1 / DG2 can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, or 1.9, etc. By setting FD1 / DG2 > 1.05 in this embodiment, it is beneficial to reduce large field-of-view light aberrations and improve the imaging quality of the optical lens 10. It is understood that there can be one lens with negative optical power in the first group 11, and the number of lenses with negative optical power in the first group 11 can also be two or more. When the number of lenses with negative optical power in the first group 11 is two or more, FD1 refers to the maximum value of the maximum aperture of the lens with negative optical power in the first group 11.

[0089] In some embodiments, the second group 12 may include at least one lens with negative optical power. By setting at least one lens in the second group 12 to have negative optical power, the focusing distance can be reduced, the focusing capability can be strengthened, and good image quality and high image sharpness can be achieved when shooting objects at different distances.

[0090] In some embodiments, the first group 11 has positive optical power, and the second group 12 has negative optical power. The first group 11, with its positive optical power, is used for beam converging, resulting in a smaller diameter of the beam entering the second group 12. This eliminates the maximum limitation of the aperture size of the second group 12, facilitating miniaturization and large aperture design of the optical lens 10. It effectively increases the aperture size, achieving a smaller aperture number and enhancing focusing capability, which is beneficial for macro photography. The second group 12, with its negative optical power, reduces the focusing distance and enhances focusing ability. A reasonable configuration of the optical power of the first group 11 and the second group 12 is beneficial for achieving miniaturization, large aperture, and telephoto capabilities of the optical lens 10, facilitating focusing from distant to close-up scenes, and improving the image quality of the optical lens 10.

[0091] In one possible implementation, the first group 11 includes a first lens L1 and a second lens L2, and the second group 12 includes a third lens L3. The first lens L1, the second lens L2, and the third lens L3 are arranged sequentially. The first lens L1 has positive optical power, the second lens L2 has negative optical power, and the third lens L3 has negative optical power. By rationally configuring the optical powers of the first lens L1, the second lens L2, and the third lens L3, it is beneficial to achieve miniaturization, a large aperture, and a long focal length in the optical lens 10. This also facilitates the focusing process of the optical lens 10 from distant to near objects and improves the image quality of the optical lens 10.

[0092] In some embodiments, the optical lens 10 satisfies the following relationship: F1 / EFL ≤ 0.95, where F1 is the focal length of the first group 11, and EFL is the effective focal length of the optical lens 10 in the first focusing state. For example, the value of F1 / EFL can be 0.3, 0.4, 0.5, 0.6, 0.7, or 0.9. By limiting the appropriate range of F1 / EFL, the optical power of the first group 11 can be reasonably configured, which is beneficial for shortening the focusing distance, improving focusing capability, enabling macro photography, and providing good image quality and high image sharpness when shooting objects at different distances. Furthermore, limiting F1 / EFL to ≤ 0.95 helps to reduce the aperture number, enabling a large aperture design, increasing the light transmission diameter, and ensuring good image quality.

[0093] In some embodiments, the optical lens 10 satisfies the following relationship: F2 / EFL > -5, where F2 is the focal length of the second group 12, and EFL is the effective focal length of the optical lens 10 in the first focusing state. In the embodiments of this application, by reasonably designing the range of the F2 / EFL ratio, it is beneficial to reduce the focusing distance and improve the focusing capability. In addition, by limiting the range of F2 / EFL, the optical lens 10 can balance the image quality difference between distant and close-up shooting with a smaller assembly sensitivity, thereby obtaining more uniform image quality.

[0094] In some embodiments, the first group 11 includes at least one lens with positive optical power, and the ratio of the focal length of the at least one lens with positive optical power in the first group 11 to the effective focal length of the optical lens 10 is less than 1. By setting the ratio of the focal length of the at least one lens with positive optical power in the first group 11 to the effective focal length of the optical lens 10 to be less than 1, it can be ensured that the first group 11 can provide sufficient optical power for the optical lens 10 even with a smaller number of lenses. This reduces the size of the first group 11, which is beneficial for macro photography and also facilitates the telephoto and miniaturized design of the optical lens 10.

[0095] In some embodiments, the maximum image height of the optical lens 10 satisfies: ImgH > 2mm, where ImgH is the maximum image height of the optical lens 10. For example, the maximum image height of the optical lens 10 can be 3mm, 4mm, 6mm, 8mm, or 10mm, etc. By limiting the range of ImgH, the embodiments of this application enable the optical lens 10 to have a large target surface, which is beneficial for achieving higher imaging magnification and improving resolution.

[0096] In some embodiments, the first group 11 includes at least one lens with high dispersion; exemplarily, the first group 11 includes at least one lens with an Abbe number less than 40. Exemplarily, the Abbe number of the lenses in the first group 11 can be 25, 30, or 35, etc. By limiting the Abbe number of at least one lens in the first group 11 to less than 40, it is beneficial to reduce chromatic aberration in the optical lens 10, thereby enabling the optical lens 10 to have good image quality.

[0097] In some embodiments, the aperture number Fno of the optical lens 10 satisfies: Fno < 5. Fno can be a value such as 1.5, 2.0, 2.3, 2.8, 3, 3.5, 4, or 4.5. A small Fno indicates a large aperture, and a large Fno indicates a small aperture. In this embodiment, by setting Fno < 5, the optical lens 10 has the characteristic of a large aperture.

[0098] In some embodiments, the optical path length of the light rays passing through the optical axis of the second group 12 in the optical folding element 131 is greater than twice the maximum image height, which is beneficial for multiple folding of the light rays, increasing the optical path length, reducing the volume of the optical lens 10, and realizing the miniaturization of the optical lens 10.

[0099] In some embodiments, the light folding element 131 may have multiple reflective surfaces. When the angle of incidence of light at the reflective surface of the light folding element 131 is less than the critical angle of the light folding element 131, the reflective surface of the light folding element 131 can be processed, for example, a reflective coating can be applied to the reflective surface. Without a reflective coating on the reflective surface of the light folding element 131, the light reflection effect is poor and the light utilization rate is low. The reflective coating can be formed by coating, sputtering, vapor deposition, or by directly attaching a reflective film.

[0100] In some embodiments, the optical folding element 131 may include a prism, which includes at least two spliced ​​sub-prisms, which may be fixedly connected by an optical adhesive.

[0101] In some embodiments, the light folding element 131 may be a triangular prism, a parallelogram prism, or a trapezoidal prism, or other elements that can provide the above-mentioned light folding function and design benefits. This application does not limit the specific shape of the light folding element 131.

[0102] In some embodiments, the first group 11 includes a deflection element (not shown), which may be located on the object side of the optical lens 10. Light entering the optical lens 10 passes through the deflection element before passing through the first group 11. The deflection element can be used to change the direction of light entering the first group 11. The deflection element makes the propagation direction of light in the first group 11 different from the direction of light entering the deflection element, thereby making the placement, angle, and space of the camera module 100 more flexible.

[0103] In some embodiments, the lenses in the first group 11 and the lenses in the second group 12 may both be made of plastic, or both may be made of glass, or some lenses may be made of plastic and some lenses may be made of glass.

[0104] In some embodiments, the object-side or image-side surface of the lenses in the first group 11 and the lenses in the second group 12 can be spherical or aspherical.

[0105] In some embodiments, when the object-side and / or image-side surfaces of some lenses in the optical lens 10 are aspherical, the object-side and / or image-side surfaces of some lenses can be defined using, but not limited to, the following aspherical formulas:

[0106] in z ( x , y ) is the optical surface sagitta; k The conic coefficient; c The radius of curvature; r The radius and height are along the optical axis. r 2 =x 2 + y 2 ; α i These are polynomial coefficients; r i It is a standardized radial coordinate.

[0107] The following will combine four examples. Figures 2 to 17 This application provides some specific, but not limiting, examples that will be described in more detail.

[0108] First Embodiment Please combine Figure 2 and Figure 3 In this embodiment, the camera module 100 includes an optical lens 10, a filter 30, and a photosensitive element 20. Light passes sequentially through the optical lens 10 and the filter 30 before being imaged by the photosensitive element 20. The optical lens 10 includes a first group 11, a second group 12, and a third group 13 arranged sequentially along the optical axis.

[0109] The first group 11 can have positive optical power and may include a first lens L1 and a second lens L2 arranged sequentially along the optical axis. The first lens L1 can have positive optical power and may include an object-side surface S1 and an image-side surface S2. The second lens L2 can have negative optical power and may include an object-side surface S3 and an image-side surface S4.

[0110] The second group 12 can have negative optical power, and the second group 12 can include a third lens L3. The third lens L3 can have negative optical power, and the third lens L3 can include an object-side surface S5 and an image-side surface S6.

[0111] The third group 13 includes a light folding element 131. The light folding element 131 may include an incident surface S7, a first reflecting surface S8, a second reflecting surface S9, a third reflecting surface S10, and an exiting surface S11. The incident surface S7, the second reflecting surface S9, and the exiting surface S11 can be coplanarly connected to form a single surface, and any two adjacent surfaces of the incident surface S7, the second reflecting surface S9, and the exiting surface S11 can at least partially overlap. For example, the incident surface S7 and the second reflecting surface S9 can be coplanar, and a portion of the incident surface S7 and the second reflecting surface S9 can overlap, allowing light to be transmitted through the overlapping area of ​​the incident surface S7 and the second reflecting surface S9 into the light folding element 131, and also allowing light to be reflected in the overlapping area of ​​the incident surface S7 and the second reflecting surface S9. In other embodiments, the incident surface S7, the second reflecting surface S9, and the exiting surface S11 may not be coplanar, and two adjacent surfaces of the incident surface S7, the second reflecting surface S9, and the exiting surface S11 may not overlap. This application does not limit this.

[0112] Before reaching the photosensitive element 20, the light rays emitted through the first group 11 and the second group 12 are reflected and folded three times within the light folding element 131. After passing through the third lens L3, the light rays can pass through the incident surface S7 and enter the light folding element 131. At least a portion of the light rays passing through the incident surface S7 is reflected at the first reflecting surface S8, and the light rays are reflected for the first time; at the second reflecting surface S9, at least a portion of the light rays reflected from the first reflecting surface S8 are reflected for the second time; at the third reflecting surface S10, at least a portion of the light rays reflected from the second reflecting surface S9 are reflected for the third time, so that at least a portion of the light rays pass through the exit surface S11 and exit the light folding element 131 to the photosensitive element 20.

[0113] In this embodiment, the light folding element 131 may include a trapezoidal prism, exemplarily an isosceles trapezoidal prism. The first reflecting surface S8 and the third reflecting surface S10 may be the two sides of an isosceles trapezoid. The angle between the incident surface S7 and the first reflecting surface S8 may be 33°, and the angle between the third reflecting surface S10 and the exiting surface S11 may be 33°. In other embodiments, the light folding element 131 may be a triangular or quadrilateral prism, or other element capable of folding the light path. The angle between the incident surface S7 and the first reflecting surface S8, or the angle between the third reflecting surface S10 and the exiting surface S11, may also be 30° or 45°, etc., and this application does not limit these values.

[0114] The first reflective surface S8 and the third reflective surface S10 may include a reflective coating. For example, the reflective coating may include a mirror coating based on a thin metal layer or a film with a white inner surface, etc., to improve the ability of the first reflective surface S8 and the third reflective surface S10 to reflect light.

[0115] In this embodiment, the first lens L1 can be made of glass, the second lens L2 can be made of plastic, and the third lens L3 can be made of plastic. In other embodiments, the first lens L1, the second lens L2, and the third lens L3 can all be made of glass or all of plastic. This application does not limit this.

[0116] Furthermore, the filter 30 may include an object-side surface S12 and an image-side surface S13. Imaging surface S14 ( Figure 2 and Figure 3 (Not marked in the text) Located on the image side of the optical lens 10, the imaging surface is the plane on which the image is formed after light passes through each lens in the optical lens 10 in sequence. The photosensitive element 20 is located at the imaging surface S14.

[0117] In this embodiment, the first group 11, the second group 12, and the photosensitive element 20 can be located on the same side of the light folding element 131. When the camera module 100 switches from a distant view state to a macro view state, the second group 12 can move along the optical axis to the image side, while the first group 11 remains stationary. The distance between the first group 11 and the second group 12 increases, and the distance between the second group 12 and the third group 13 decreases. Alternatively, the first group 11 can move along the optical axis to the object side, and the second group 12 can move along the optical axis to the image side to increase the distance between the first group 11 and the second group 12, thereby achieving focusing. In the first embodiment, by Figure 2 The distant view shown Figure 3 In the close-up view shown, focusing can be achieved by moving the second group 12. In other embodiments, focusing can also be achieved by moving the third group 13, and the distance between the second group 12 and the third group 13 can be increased or decreased.

[0118] The optical lens 10 includes an aperture STO, which can be located on the object side of the first lens L1 of the first group 11. In other embodiments, the aperture STO can also be located in other positions, which is not limited in this application.

[0119] Refer to Table 1a, which shows the radius of curvature, thickness, refractive index, and Abbe number of each lens and filter 30 of the optical lens 10 in the first embodiment when operating at infinity. The Abbe number is also known as the dispersion coefficient. OBJ represents the object plane of the optical lens 10.

[0120] Table 1a

[0121] Please refer to Table 1b, which shows the aspherical coefficients of each lens of the optical lens 10 in the first embodiment.

[0122] Table 1b

[0123] In this table, A4, A6, A8, A10, A12, A14, and A16 represent aspheric coefficients. It should be noted that all parameters in the table are expressed in scientific notation. For example, 8.1143710E-05 means 8.1143710 × 10⁻⁶. -5 It should be noted that the symbols A4, A6, A8, A10, A12, A14, and A16 in this application, when they appear again in the future, will have the same meaning as here unless otherwise explained, and will not be repeated hereafter.

[0124] In this embodiment, the object-side surface and image-side surface of the first lens L1 to the third lens L3 are both aspherical surfaces, which can be limited by, but not limited to, the following aspherical surface formula:

[0125] Where z(x,y) is the optical surface sagitta; k is the conic coefficient; c is the radius of curvature; r is the radius height along the optical axis; r 2 =x 2 +y 2 αi are polynomial coefficients; ri are standardized radial coordinates; A4, A6, A8, A10, A12, A14 and A16 are aspherical coefficients.

[0126] Please refer to Table 1c, which is... Figure 2 The basic parameters of the optical lens 10 shown are as follows when shooting at a telephoto distance. f11 is the focal length of the first lens L1 in the first group 11, and f12 is the focal length of the second lens L2 in the first group 11.

[0127] Table 1c

[0128] Please see Figure 4 , Figure 4 This is a characterization diagram of the optical performance of the optical lens 10 in the first embodiment during telephoto shooting.

[0129] in, Figure 4 This includes axial aberration curves, astigmatism curves, and distortion diagrams for the optical lens 10. The axial aberration curves include aberration curves corresponding to different wavelengths of the system (illustrated as 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm). Physically, it represents the deviation of light of a corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. Figure 4 The values ​​are all relatively small, indicating that the axial aberrations (spherical aberration, chromatic aberration, etc.) of the optical lens 10 are well corrected. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line represents the X-direction beam, and the dashed line represents the Y-direction beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 4 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 4 All values ​​shown are within 2%, ensuring that there is no obvious distortion in the image.

[0130] Please see Figure 5 , Figure 5 This is a characterization diagram of the optical performance of the optical lens 10 in the first embodiment at a macro distance.

[0131] in, Figure 5 This includes axial aberration curves, astigmatism curves, and distortion diagrams of the optical lens 10 at an object distance of 100mm. The axial aberration curves include aberration curves corresponding to different wavelengths of the system (illustrated as 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm). Figure 5 The values ​​are all relatively small, indicating that the axial aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line represents the X-direction beam, and the dashed line represents the Y-direction beam. When a value in a certain field of view is too large, the image quality of that field of view is poor or contains advanced aberrations. Figure 5 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 5 The distortion shown is all within 3%, which ensures that there is no obvious deformation in the image.

[0132] according to Figure 4 and Figure 5 It can be seen that the optical lens 10 given in the first embodiment can achieve good imaging quality in both telephoto shooting and macro shooting at an object distance of 100mm.

[0133] In this embodiment, when the optical lens 10 switches from a distant view to a close-up view, for example, to a macro 100mm setting, the distance between the first group 11 and the second group 12 increases, the focal length (VM) becomes 0.7mm, the focusing throw is short, the focusing effect is good, and a good macro shooting effect can be achieved. In this embodiment, the EFL is 17.2mm, the Fno is 2.8, and the FOV is 25°. The optical lens 10 of this application has the characteristics of a telephoto lens and a large aperture.

[0134] Second Embodiment Please combine Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the camera module 100 provided in the second embodiment of this application in one working state. Figure 7 This is a schematic diagram of the camera module 100 provided in the second embodiment of this application in another working state. Figure 6 The image in the middle shows the camera module 100 of the second embodiment of this application in a distant view shooting state during telephoto shooting. Figure 7 This is the close-up working state of the camera module 100 macro (100mm) during shooting according to the second embodiment of this application.

[0135] In this embodiment, the camera module 100 includes an optical lens 10, a filter 30, and a photosensitive element 20. In this embodiment, light passes sequentially through the optical lens 10 and the filter 30 before reaching the photosensitive element 20 to form an image. The optical lens 10 includes a first group 11, a second group 12, and a third group 13 arranged sequentially along the optical axis.

[0136] The first group 11 can have positive optical power and may include a first lens L1 and a second lens L2 arranged sequentially along the optical axis. The first lens L1 can have positive optical power and may include an object-side surface S1 and an image-side surface S2. The second lens L2 can have negative optical power and may include an object-side surface S3 and an image-side surface S4.

[0137] The second group 12 can have negative optical power, and the second group 12 can include a third lens L3. The third lens L3 can have negative optical power, and the third lens L3 can include an object-side surface S5 and an image-side surface S6.

[0138] The third group 13 includes a light folding element 131. The light folding element 131 may include an incident surface S7, a first reflecting surface S8, a second reflecting surface S9, a third reflecting surface S10, a fourth reflecting surface S11, and an exiting surface S12. The incident surface S7 and the second reflecting surface S9 can be coplanarly connected to form a single surface, and the two surfaces can at least partially overlap. Light can be transmitted through the overlapping area of ​​the incident surface S7 and the second reflecting surface S9 into the light folding element 131, and light can also be reflected in the overlapping area of ​​the incident surface S7 and the second reflecting surface S9. In other embodiments, the incident surface S7 and the second reflecting surface S9 may not be coplanar; this application does not limit this. The third reflecting surface S10 and the exiting surface S12 can be coplanarly connected to form a single surface, and the two surfaces can at least partially overlap. In other embodiments, the third reflecting surface S10 and the exiting surface S12 may not be coplanar; this application does not limit this.

[0139] Before reaching the photosensitive element 20, the light rays emitted through the first group 11 and the second group 12 can be folded four times within the light folding element 131. After passing through the third lens L3, the light rays can pass through the incident surface S7 and enter the light folding element 131. At least a portion of the light rays passing through the incident surface S7 is reflected at the first reflecting surface S8, and the light rays are reflected for the first time; at the second reflecting surface S9, at least a portion of the light rays reflected from the first reflecting surface S8 are reflected for the second time; at the third reflecting surface S10, at least a portion of the light rays reflected from the second reflecting surface S9 are reflected for the third time; and at the fourth reflecting surface S11, at least a portion of the light rays reflected from the third reflecting surface S10 are reflected for the fourth time, so that at least a portion of the light rays pass through the exit surface S12 and exit the light folding element 131 to the photosensitive element 20.

[0140] In this embodiment, the light folding element 131 may include a parallelogram prism, with the first reflecting surface S8 and the fourth reflecting surface S11 being parallel. The angle between the incident surface S7 and the first reflecting surface S8 may be 30°, and the angle between the exiting surface S12 and the fourth reflecting surface S11 may be 30°. In other embodiments, the angle between the incident surface S7 and the first reflecting surface S8, or the angle between the exiting surface S12 and the fourth reflecting surface S11, may be acute angles such as 20°, 25°, or 45°, and this application does not limit these angles.

[0141] The first reflective surface S8 and the fourth reflective surface S11 may include a reflective coating. For example, the reflective coating may include a mirror coating based on a thin metal layer or a film with a white inner surface, etc., to improve the ability of the first reflective surface S8 and the fourth reflective surface S11 to reflect light.

[0142] In this embodiment, the first lens L1 is made of glass, the second lens L2 is made of plastic, and the third lens L3 is made of plastic. In other embodiments, the first lens L1, the second lens L2, and the third lens L3 may all be made of glass or all of plastic. This application does not limit this.

[0143] Furthermore, the filter 30 may include an object-side surface S13 and an image-side surface S14. Imaging surface S15 ( Figure 6 and Figure 7 (Not marked in the text) is the imaging plane where light passes through each lens group in the optical lens 10 in sequence to form an image. The photosensitive element 20 is located at the imaging plane S15.

[0144] In this embodiment, the first group 11 and the second group 12 are located on different sides of the photosensitive element 20 from the light folding element 131. When the camera module 100 switches from a distant view state to a macro view state, the second group 12 can move along the optical axis to the image side, while the first group 11 remains stationary. The distance between the first group 11 and the second group increases, and the distance between the second group 12 and the third group 13 decreases. Alternatively, the first group 11 can move along the optical axis to the object side, and the second group 12 can move along the optical axis to the image side, thereby increasing the distance between the first group 11 and the second group 12 to achieve focusing. In the second embodiment, by Figure 6 The distant view shown Figure 7 In the close-up view shown, focusing can be achieved by moving the second group 12. In other embodiments, focusing can also be achieved by moving the third group 13, and the distance between the second group 12 and the third group 13 can be increased or decreased.

[0145] The optical lens 10 includes an aperture STO, which can be located on the object side of the first lens L1 of the first group 11. In other embodiments, the aperture STO can also be located in other positions, which is not limited in this application.

[0146] Refer to Table 2a, which shows the radius of curvature, thickness, refractive index, and Abbe number of each lens and filter 30 in the optical lens 10 of the second embodiment when operating at infinity. The Abbe number is also known as the dispersion coefficient. Here, OBJ represents the object plane of the optical lens 10.

[0147] Table 2a

[0148] Please refer to Table 2b, which shows the aspherical coefficients of each lens in the optical lens 10 of the second embodiment.

[0149] Table 2b

[0150] In this embodiment, the object-side surface and image-side surface of the first lens L1 to the third lens L3 are both aspherical surfaces, which can be limited by, but not limited to, the following aspherical surface formula:

[0151] Where z(x,y) is the optical surface sagitta; k is the conic coefficient; c is the radius of curvature; r is the radius height along the optical axis; r 2 =x 2 +y 2 αi are polynomial coefficients; ri are standardized radial coordinates; A4, A6, A8, A10, A12, A14 and A16 are aspherical coefficients.

[0152] Please refer to Table 2c, which is... Figure 6The basic parameters of the optical lens 10 shown are as follows when shooting at a telephoto distance. f11 is the focal length of the first lens L1 in the first group 11, and f12 is the focal length of the second lens L2 in the first group 11.

[0153] Table 2c

[0154] Please see Figure 8 , Figure 8 This is a characterization diagram of the optical performance of the optical lens 10 in the second embodiment during telephoto shooting.

[0155] in, Figure 8 This includes axial aberration curves, astigmatism curves, and distortion diagrams for the optical lens 10. The axial aberration curves include aberration curves corresponding to different wavelengths of the system (illustrated as 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm). Physically, it represents the deviation of light of a corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. Figure 8 The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line represents the X-direction beam, and the dashed line represents the Y-direction beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are higher-order aberrations. Figure 8 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 8 All values ​​shown are within 1%, ensuring that there is no obvious distortion in the image.

[0156] Please see Figure 9 , Figure 9 This is a characterization diagram of the optical performance of the optical lens 10 in the second embodiment at a macro distance.

[0157] in, Figure 9 This includes axial aberration curves, astigmatism curves, and distortion diagrams of the optical lens 10 at an object distance of 100mm. The axial aberration curves include aberration curves corresponding to different wavelengths of the system (illustrated as 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm). Figure 9The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line represents the X-direction beam, and the dashed line represents the Y-direction beam. When a value in a certain field of view is too large, the image quality of that field of view is poor or contains advanced aberrations. Figure 9 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 9 The distortion shown is all within 2%, which ensures that there is no obvious deformation in the image.

[0158] according to Figure 8 and Figure 9 It can be seen that the optical lens 10 given in the second embodiment can achieve good imaging quality in both telephoto shooting and macro shooting at an object distance of 100mm.

[0159] In this embodiment, when the optical lens 10 switches from a distant view to a close-up view, for example, to a macro 100mm setting, the distance between the first group 11 and the second group 12 increases, the focal length (VM) becomes 1.1mm, the focusing throw is short, the focusing effect is good, and a good macro shooting effect can be achieved. In this embodiment, the EFL is 20mm, the Fno is 2.8, and the FOV is 25°. The optical lens 10 of this application has the characteristics of a telephoto lens and a large aperture.

[0160] Third Embodiment Please combine Figure 10 and Figure 11 , Figure 10 This is a schematic diagram of the camera module 100 provided in the third embodiment of this application in one working state. Figure 11 This is a schematic diagram of the camera module 100 provided in the third embodiment of this application in another working state. Figure 10 The image in the middle shows the camera module 100 of the third embodiment of this application in a distant view shooting state during telephoto shooting. Figure 11 This is the close-up working state of the camera module 100 in the third embodiment of this application when shooting at macro (100mm).

[0161] In this embodiment, the camera module 100 includes an optical lens 10, a filter 30, and a photosensitive element 20. Light passes sequentially through the optical lens 10 and the filter 30 before being imaged by the photosensitive element 20. The optical lens 10 includes a first group 11, a second group 12, and a third group 13 arranged sequentially along the optical axis.

[0162] The first group 11 can have positive optical power, and can include a first lens L1 and a second lens L2 arranged sequentially along the optical axis. The first lens L1 can have positive optical power and includes an object-side surface S1 and an image-side surface S2. The second lens can have negative optical power, and the second lens L2 includes an object-side surface S3 and an image-side surface S4.

[0163] The second group 12 can have negative optical power, and the second group 12 includes a third lens L3. The third lens L3 can have negative optical power, and the third lens L3 can include an object-side surface S5 and an image-side surface S6.

[0164] The third group 13 includes a light folding element 131. The light folding element 131 may include an incident surface S7, a first reflecting surface S8, a first surface S9, a second surface S10, a second reflecting surface S11, and an exiting surface S12. The incident surface S7 and the exiting surface S12 may be coplanar. In other embodiments, the incident surface S7 and the exiting surface S12 may not be coplanar, and this application does not limit this.

[0165] Before reaching the photosensitive element 20, the light rays emitted through the first group 11 and the second group 12 are reflected and folded twice within the light folding element 131. After passing through the third lens L3, the light rays can pass through the incident surface S7 and enter the light folding element 131. At least a portion of the light rays can reach the first reflecting surface S8 and be reflected there, marking the first reflection. At least a portion of the light rays reflected from the first reflecting surface S8 can pass through the first surface S9. At least a portion of the light rays passing through the first surface S9 can reach and pass through the second surface S10. At least a portion of the light rays passing through the second surface S10 can reach the second reflecting surface S11 and be reflected there, marking the second reflection. At least a portion of the light rays reflected from the second reflecting surface S11 can reach the exit surface S12, pass through the exit surface S12, exit the light folding element 131, and be incident on the photosensitive element 20 to form an image.

[0166] In this embodiment, the light folding element 131 can be an isosceles trapezoidal prism. It is understood that, viewed from the isosceles trapezoidal prism, the surface formed by the connection of the incident surface S7 and the exit surface S12 is the long side of the trapezoid. The first reflecting surface S8 and the second reflecting surface S11 can be the two sides of the isosceles trapezoid. The angle between the incident surface S7 and the first reflecting surface S8 can be 45°, and the angle between the second reflecting surface S11 and the exit surface S12 can also be 45°. In other embodiments, the angle between the incident surface S7 and the first reflecting surface S8, or the angle between the second reflecting surface S11 and the exit surface S12, can also be 30° or 40°, etc.

[0167] The first reflective surface S8 and the second reflective surface S11 may include a reflective coating. For example, the reflective coating may include a mirror coating based on a thin metal layer or a film with a white inner surface, etc., to improve the ability of the first reflective surface S8 and the second reflective surface S11 to reflect light.

[0168] In this embodiment, the first lens L1 is made of plastic, the second lens L2 is made of plastic, and the third lens is made of plastic. In other embodiments, the first lens L1, the second lens L2, and the third lens L3 may all be made of glass, or may include both glass and plastic materials. This application does not limit this.

[0169] Furthermore, the filter 30 includes an object-side surface S13 and an image-side surface S14. The imaging surface S15 ( Figure 10 and Figure 11 (Not marked in the text) Located on the image side of all lens groups in the optical lens 10, the imaging surface S15 is the surface on which the image is formed after light passes through each lens in the optical lens 10 in sequence. The photosensitive element 20 is located at the imaging surface S15.

[0170] In this embodiment, the first group 11 and the second group 12 are located on the same side of the light folding element 131 as the photosensitive element 20. When the camera module 100 switches from a distant view state to a macro view state, the second group 12 can move along the optical axis to the image side while the first group 11 remains stationary; alternatively, the first group 11 can move along the optical axis to the object side while the second group 12 can move along the optical axis to the image side, thereby increasing the distance between the first group 11 and the second group 12 to achieve focusing. In the third embodiment, by Figure 10 The distant view shown Figure 11 In the close-up view shown, focusing can be achieved by moving the second group 12. In other embodiments, focusing can also be achieved by moving the third group 13, and the distance between the second group 12 and the third group 13 can be increased or decreased.

[0171] The optical lens 10 includes an aperture STO, which can be located on the object side of the first lens L1 of the first group 11. In other embodiments, the aperture STO can also be located in other positions, which is not limited in this application.

[0172] Refer to Table 3a, which shows the radius of curvature, thickness, refractive index, and Abbe number of each lens and filter 30 in the optical lens 10 of the third embodiment when operating at infinity. The Abbe number is also known as the dispersion coefficient. OBJ represents the object plane of the optical lens 10.

[0173] Table 3a

[0174] Please refer to Table 3b, which shows the aspherical coefficients of each lens in the optical lens 10 of the third embodiment.

[0175] Table 3b

[0176] In this embodiment, the object-side surface and image-side surface of the first lens L1 to the third lens L3 are both aspherical surfaces, which can be limited by, but not limited to, the following aspherical surface formula:

[0177] Where z(x,y) is the optical surface sagitta; k is the conic coefficient; c is the radius of curvature; r is the radius height along the optical axis; r 2 =x 2 +y 2 αi are polynomial coefficients; ri are standardized radial coordinates; A4, A6, A8, A10, A12, A14 and A16 are aspherical coefficients.

[0178] Please refer to Table 3c, which is... Figure 10 The basic parameters of the optical lens 10 shown are as follows when shooting at a telephoto distance. f11 is the focal length of the first lens L1 in the first group 11, and f12 is the focal length of the second lens L2 in the first group 11.

[0179] Table 3c

[0180] Please see Figure 12 , Figure 12 This is a characterization diagram of the optical performance of the optical lens 10 in the third embodiment during telephoto shooting.

[0181] in, Figure 12 This includes axial aberration curves, astigmatism curves, and distortion diagrams for the optical lens 10. The axial aberration curves include aberration curves corresponding to different wavelengths of the system (illustrated as 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm). Physically, it represents the deviation of light of a corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. Figure 12 The values ​​are all relatively small, indicating that the axial aberrations (spherical aberration, chromatic aberration, etc.) of the optical lens 10 are well corrected. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line represents the X-direction beam, and the dashed line represents the Y-direction beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are higher-order aberrations. Figure 12The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 12 All values ​​shown are within 3%, ensuring that there is no obvious distortion in the image.

[0182] Please see Figure 13 , Figure 13 This is a characterization diagram of the optical performance of the optical lens 10 in the third embodiment at a macro distance.

[0183] in, Figure 13 This includes axial aberration curves, astigmatism curves, and distortion diagrams of the optical lens 10 at an object distance of 100mm. The axial aberration curves include aberration curves corresponding to different wavelengths of the system (illustrated as 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm). Figure 13 The values ​​are all relatively small, indicating that the axial aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line represents the X-direction beam, and the dashed line represents the Y-direction beam. When a value in a certain field of view is too large, the image quality of that field of view is poor or contains advanced aberrations. Figure 13 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 13 The distortion shown is all within 4%, which ensures that there is no obvious deformation in the image.

[0184] according to Figure 12 and Figure 13 It can be seen that the optical lens 10 given in the third embodiment can achieve good imaging quality in both telephoto shooting and macro shooting at an object distance of 100mm.

[0185] In this embodiment, when the optical lens 10 switches from a distant view to a close-up view, for example, to a macro 100mm setting, the distance between the first group 11 and the second group 12 increases, the focal length (VM) becomes 0.75mm, the focusing distance is short, the focusing effect is good, and a good macro shooting effect can be achieved. In this embodiment, the EFL is 17.2mm, the Fno is 2.2, and the FOV is 24.5°. The optical lens 10 of this application has the characteristics of a telephoto lens and a large aperture.

[0186] Fourth embodiment Please combine Figure 14 and Figure 15 , Figure 14 This is a schematic diagram of the camera module 100 provided in the fourth embodiment of this application in one working state. Figure 15This is a schematic diagram of the camera module 100 provided in the fourth embodiment of this application in another working state. Figure 14 The image in the middle shows the camera module 100 of the fourth embodiment of this application in a distant view shooting state during telephoto shooting. Figure 15 This is the close-up working state of the camera module 100 macro (100mm) during shooting according to the fourth embodiment of this application.

[0187] In this embodiment, the camera module 100 includes an optical lens 10, a filter 30, and a photosensitive element 20. Light passes sequentially through the optical lens 10 and the filter 30 before being imaged by the photosensitive element 20. The optical lens 10 includes a first group 11, a second group 12, and a third group 13 arranged sequentially along the optical axis.

[0188] The first group 11 can have positive optical power and may include a first lens L1 and a second lens L2 arranged sequentially along the optical axis. The first lens L1 can have positive optical power and may include an object-side surface S1 and an image-side surface S2. The second lens L2 can have negative optical power and may include an object-side surface S3 and an image-side surface S4.

[0189] The second group 12 can have negative optical power, and the second group 12 can include a third lens L3. The third lens L3 can have negative optical power, and the third lens L3 can include an object-side surface S5 and an image-side surface S6.

[0190] The third group 13 includes a light folding element 131. The light folding element 131 may include an incident surface S7, a first reflecting surface S8, a second reflecting surface S9, a third reflecting surface S10, a fourth reflecting surface S11, a fifth reflecting surface S12, and an exiting surface S13. The incident surface S7, the second reflecting surface S9, the fourth reflecting surface S11, and the exiting surface S13 can be coplanarly connected to form a single surface, and any two adjacent surfaces of the four surfaces can at least partially overlap. For example, the incident surface S7 and the second reflecting surface S9 can be coplanar, and a portion of the incident surface S7 and the second reflecting surface S9 can overlap. Optical light can be transmitted into the light folding element 131 from the overlapping area of ​​the incident surface S7 and the second reflecting surface S9, and light can also be reflected from the overlapping area of ​​the incident surface S7 and the second reflecting surface S9. In other embodiments, the incident surface S7, the second reflecting surface S9, the fourth reflecting surface S11, and the exiting surface S13 may not be coplanar, and two adjacent surfaces of the incident surface S7, the second reflecting surface S9, and the exiting surface S13 may not overlap. This application does not limit this.

[0191] Before reaching the photosensitive element 20, the light rays emitted through the first group 11 and the second group 12 can be reflected and folded five times within the light folding element 131. After passing through the third lens L3, the light rays can pass through the incident surface S7 and enter the light folding element 131. At least a portion of the light rays passing through the incident surface S7 is reflected at the first reflecting surface S8, and the light rays are reflected for the first time; at the second reflecting surface S9, at least a portion of the light rays reflected from the first reflecting surface S8 are reflected for the second time; at the third reflecting surface S10, at least a portion of the light rays reflected from the second reflecting surface S9 are reflected for the third time; at the fourth reflecting surface S11, at least a portion of the light rays reflected from the third reflecting surface S10 are reflected for the fourth time; and at the fifth reflecting surface S12, at least a portion of the light rays are reflected for the fifth time, so that at least a portion of the light rays pass through the exit surface S13 and exit the light folding element 131 to the photosensitive element 20.

[0192] In this embodiment, the light folding element 131 may include a trapezoidal prism, exemplarily an isosceles trapezoidal prism. The first reflecting surface S8 and the fifth reflecting surface S12 may be the two sides of an isosceles trapezoid. The angle between the incident surface S7 and the first reflecting surface S8 may be 30°, and the angle between the fifth reflecting surface S12 and the exiting surface S13 may be 30°. In other embodiments, the angle between the incident surface S7 and the first reflecting surface S8, or the angle between the fifth reflecting surface S12 and the exiting surface S13, may be 36° or 45°, etc., and this application does not limit these angles.

[0193] The first reflective surface S8, the third reflective surface S10, and the fifth reflective surface S12 may include a reflective coating. For example, the reflective coating may include a mirror coating based on a thin metal layer or a film with a white inner surface, etc., to improve the ability of the first reflective surface S8, the third reflective surface S10, and the fifth reflective surface S12 to reflect light.

[0194] In this embodiment, the first lens L1, the second lens L2, and the third lens can all be made of plastic. In other embodiments, the first lens L1, the second lens L2, and the third lens L3 can all be made of glass, or a combination of glass and plastic; this application does not limit the specific materials used.

[0195] In addition, filter 30 may include an object-side surface S14 and an image-side surface S15. Imaging surface S16 ( Figure 10 and Figure 11 (Not marked in the text) Located on the image side of the optical lens 10, the imaging surface is the plane on which the image is formed after light passes through each lens in the optical lens 10 in sequence. The photosensitive element 20 is located at the imaging surface S16.

[0196] In this embodiment, the first group 11, the second group 12, and the photosensitive element 20 are located on the same side of the light folding element 131. When the camera module 100 switches from a distant view state to a macro view state, the second group 12 can move along the optical axis to the image side while the first group 11 remains stationary; alternatively, the first group 11 can move along the optical axis to the object side while the second group 12 can move along the optical axis to the image side, thereby increasing the distance between the first group 11 and the second group 12 to achieve focusing. In the fourth embodiment, by Figure 14 The distant view shown Figure 15 In the close-up view shown, focusing can be achieved by moving the second group 12. In other embodiments, focusing can also be achieved by moving the third group 13, and the distance between the second group 12 and the third group 13 can be increased or decreased.

[0197] The optical lens 10 includes an aperture STO, which can be located on the object side of the first lens L1 of the first group 11. In other embodiments, the aperture STO can also be located in other positions, which is not limited in this application.

[0198] Refer to Table 4a, which shows the radius of curvature, thickness, refractive index, and Abbe number of each lens and filter 30 in the optical lens 10 of the fourth embodiment when operating at infinity. The Abbe number is also known as the dispersion coefficient. OBJ represents the object plane of the optical lens 10.

[0199] Table 4a

[0200] Please refer to Table 4b, which shows the aspherical coefficients of each lens in the optical lens 10 of the fourth embodiment.

[0201] Table 4b

[0202] In this embodiment, the object-side surface and image-side surface of the first lens L1 to the third lens L3 are both aspherical surfaces, which can be limited by, but not limited to, the following aspherical surface formula:

[0203] Where z(x,y) is the optical surface sagitta; k is the conic coefficient; c is the radius of curvature; r is the radius height along the optical axis; r 2 =x 2 +y 2 αi are polynomial coefficients; ri are standardized radial coordinates; A4, A6, A8, A10, A12, A14 and A16 are aspherical coefficients.

[0204] Please refer to Table 4c, which is... Figure 14The basic parameters of the optical lens 10 shown are as follows when shooting at a telephoto distance. f11 is the focal length of the first lens L1 in the first group 11, and f12 is the focal length of the second lens L2 in the first group 11.

[0205] Table 4c

[0206] Please see Figure 16 , Figure 16 This is a characterization diagram of the optical performance of the optical lens 10 in the fourth embodiment during telephoto shooting.

[0207] in, Figure 16 This includes axial aberration curves, astigmatism curves, and distortion diagrams for the optical lens 10. The axial aberration curves include aberration curves corresponding to different wavelengths of the system (illustrated as 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm). Physically, it represents the deviation of light of a corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. Figure 16 The values ​​are all relatively small, indicating that the axial aberrations (spherical aberration, chromatic aberration, etc.) of the optical lens 10 are well corrected. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line represents the X-direction beam, and the dashed line represents the Y-direction beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are higher-order aberrations. Figure 16 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 16 All values ​​shown are within 0.5%, ensuring that there is no obvious distortion in the image.

[0208] Please see Figure 17 , Figure 17 This is a characterization diagram of the optical performance of the optical lens 10 in the fourth embodiment at a macro distance.

[0209] in, Figure 17 This includes axial aberration curves, astigmatism curves, and distortion diagrams of the optical lens 10 at an object distance of 100mm. The axial aberration curves include aberration curves corresponding to different wavelengths of the system (illustrated as 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm). Figure 13The values ​​are all relatively small, indicating that the axial aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line represents the X-direction beam, and the dashed line represents the Y-direction beam. When a value in a certain field of view is too large, the image quality of that field of view is poor or contains advanced aberrations. Figure 17 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 17 The distortion shown is all within 1%, which ensures that there is no obvious deformation in the image.

[0210] according to Figure 16 and Figure 17 It can be seen that the optical lens 10 given in the fourth embodiment can achieve good imaging quality in both telephoto shooting and macro shooting at an object distance of 100mm.

[0211] In this embodiment, when the optical lens 10 switches from a distant view to a close-up view, for example, to a macro 100mm setting, the distance between the first group 11 and the second group 12 increases, the focal length (VM) becomes 1.3mm, the focusing throw is short, the focusing effect is good, and a good macro shooting effect can be achieved. In this embodiment, the EFL is 26.5mm, the Fno is 3.5, and the FOV is 16.2°. The optical lens 10 of this application has the characteristics of telephoto, macro, and large aperture.

[0212] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical lens characterized in that, It includes a first group, a second group, and a third group, wherein the optical power of the first group is opposite to that of the second group; The first group includes at least two lenses; The second group includes at least one lens; The third group includes a light folding element. The light rays emitted from the first group pass sequentially through the second group and the light folding element, and the light rays undergo at least three reflections within the light folding element. The second group is a focusing lens group. During the focusing process of the optical lens from a distant scene to a close-up scene, the distance between the first group and the second group increases, and the distance between the second group and the third group decreases; the optical lens satisfies the following relationship: FOV < 50° FD1 / DG2 > 1.05 FOV is the field of view of the optical lens in the first focusing state, the working object distance in the first focusing state is the maximum working object distance of the optical lens, FD1 is the maximum aperture of the lens with negative optical power in the first group, and DG2 is the maximum aperture of the second group.

2. The optical lens of claim 1, wherein, The first group is a fixed lens group, and during the focusing process of the optical lens from a distant to a near view, the second group moves along the optical axis to the image side; or, The first group is a focusing lens group. During the focusing process of the optical lens from a distant view to a close view, the first group moves towards the object side along the optical axis and the second group moves towards the image side along the optical axis.

3. The optical lens according to claim 1 or 2, characterized in that, The second group includes at least one lens with an Abbe number greater than 15.

4. The optical lens according to any one of claims 1 to 3, characterized in that, The maximum aperture DG1 of the first group and the maximum aperture DG2 of the second group satisfy the following relationship: DG1 / DG2>1.

1.

5. The optical lens according to any one of claims 1 to 4, characterized in that, The optical lens has a first working object distance DM, which is less than or equal to 1m. The optical lens also has a second focusing state, where the working object distance in the second focusing state is the first working object distance DM. During the process of switching the optical lens from the first focusing state to the second focusing state, the change in spacing between the first group and the second group is VM. The optical lens satisfies the following relationship: VM>1 / DM.

6. The optical lens according to any one of claims 1 to 5, characterized in that, During the focusing process of the optical lens from a distant view to a close view, the third group moves away from the object side along the optical axis.

7. The optical lens according to any one of claims 1 to 6, characterized in that, The second group includes at least one lens with negative optical power.

8. The optical lens according to any one of claims 1 to 7, characterized in that, The first group has positive optical power, and the second group has negative optical power.

9. The optical lens according to any one of claims 1 to 8, characterized in that, The first group includes a first lens and a second lens, and the second group includes a third lens. The first lens, the second lens and the third lens are arranged in sequence. The first lens has positive optical power, the second lens has negative optical power, and the third lens has negative optical power.

10. The optical lens according to any one of claims 1 to 9, characterized in that, The focal length F1 of the first group of optical lenses and the effective focal length EFL of the optical lenses in the first focusing state satisfy the following relationship: F1 / EFL≤0.

95.

11. The optical lens according to any one of claims 1 to 10, characterized in that, The focal length F2 of the second group of the optical lens and the effective focal length EFL of the optical lens in the first focusing state satisfy the following relationship: F2 / EFL > -5.

12. The optical lens according to any one of claims 1 to 11, characterized in that, The first group includes at least one lens with positive optical power, wherein the ratio of the focal length of the at least one lens with positive optical power in the first group to the effective focal length of the optical lens is less than 1.

13. The optical lens according to any one of claims 1 to 12, characterized in that, The optical lens satisfies the following relationship: ImgH>2mm, ImgH is the maximum image height of the optical lens.

14. The optical lens according to any one of claims 1 to 13, characterized in that, The first group includes at least one lens with an Abbe number of less than 40.

15. The optical lens according to any one of claims 1 to 14, characterized in that, The optical lens satisfies the following relationship: Fno<5, Fno is the aperture number of the optical lens.

16. The optical lens according to any one of claims 1 to 15, characterized in that, The optical path length of the light rays passing through the optical axis of the second group in the optical folding element is greater than twice the maximum image height.

17. A camera module, characterized in that, It includes a photosensitive element and an optical lens as claimed in any one of claims 1 to 16, wherein the photosensitive element is located on the image side of the optical lens.

18. An electronic device, characterized in that, The device includes an image processor and the camera module of claim 17, wherein the image processor is communicatively connected to the camera module, and the image processor is used to acquire image data from the camera module and process the image data.

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