Optical lens, camera module and electronic equipment

Abstract

The invention discloses an optical lens, a camera module and electronic equipment. The optical lens comprises a first group and a second group, and the focal power of the first group is opposite to that of the second group; the first group comprises at least two lenses; the second group comprises at least one lens and a light folding element, the lens of the second group is located between the first group and the light folding element, the light emitted out of the first group sequentially passes through the lens of the second group and the light folding element, and the light is reflected for multiple times in the light folding element; the first group and / or the second group are / is a focusing lens group, and the distance between the first group and the second group is increased in the focusing process of the optical lens from long shot to close shot; the optical lens meets the relational expression that FOV is smaller than 50 degrees, and FOV is the field angle of the optical lens when the object distance is infinite. The optical lens provided by the invention has the characteristics of long focus and micro distance, and can realize miniaturization.

Description

Technical Field

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

[0002] With the advancement of technology, the application of camera modules is becoming more and more extensive. In daily life, electronic devices such as mobile phones and tablets are equipped with camera modules to facilitate people to take pictures anytime and anywhere, bringing convenience and fun to people's lives.

[0003] At present, users have higher and higher requirements for the functions and imaging quality of the optical lens in the camera module. For example, the lens is required to be able to shoot distant objects to achieve telephoto shooting; the lens is required to be able to shoot close-up objects to achieve close-up shooting; and the lens is required to be miniaturized to reduce the space occupied by electronic equipment. However, the optical lens in the current conventional camera module is large in size and mainly focuses on shooting at a large object distance. When the optical lens shoots at a small object distance, the optical lens usually requires a large focus stroke to achieve focus. The focusing ability of the optical lens is weak, and the imaging effect is poor.

[0004] Therefore, the present application will provide an optical lens that can have good imaging effects at both infinity and macro, and can have miniaturization and telephoto characteristics. Summary of the invention

[0005] The embodiments of the present application disclose an optical lens, a camera module and an electronic device. The optical lens has the characteristics of miniaturization and telephoto, and can have good imaging effects from infinity to macro.

[0006] In the first aspect, the present application provides an optical lens, including a first group and a second group, wherein the optical focal length of the first group is opposite to that of the second group, and illustratively, the first group may have a positive optical focal length, and the second group may have a negative optical focal length, or the first group may have a negative optical focal length, and the second group may have a positive optical focal length. The first group includes at least two lenses, which is conducive to correcting chromatic aberration; the second group includes at least one lens and a light folding element, and the lens of the second group is located between the first group and the light folding element, and the light emitted from the first group passes through the lens of the second group and the light folding element in sequence, and the light is reflected multiple times in the light folding element; the first group and / or the second group are focusing lens groups, and during the focusing process of the optical lens from the far view to the near view, the distance between the first group and the second group increases; the optical lens satisfies the following relationship: FOV<50°, and FOV is the field of view angle of the optical lens when the object distance is infinite. When focusing, the first group can be moved along the optical axis to focus, while the second group does not move, or the second group can be moved along the optical axis while the first group does not move to achieve focusing, or the first group and the second group can be moved simultaneously to achieve focusing. Light can be reflected at least twice in the light folding element.

[0007] The optical lens of the embodiment of the present application has the characteristics of miniaturization, small footprint, telephoto, and macro imaging. The embodiment of the present application includes two groups, and the first group and / or the second group are focusing lens groups, which can enhance the focusing ability of the optical lens and facilitate macro photography. The embodiment of the present application reasonably configures the optical focal length of the first group and the second group, and sets the first group and the second group to have opposite optical focal lengths, which is conducive to achieving focusing and macro focusing, can reduce the focus formation, and has strong focusing ability, and is conducive to improving the overall image quality of the optical system when imaging in close-up, increasing the amount of light entering the system, promoting macro imaging, and balancing the difference in imaging quality between long-range shooting and close-up shooting, and has good image quality and high imaging clarity when shooting objects at different distances. It can be understood that the light entering the optical lens enters the lenses of the first group, the second group, and the light folding element in sequence. By setting the lenses of the second group adjacent to the first group, that is, the light first passes through the lenses of the second group and then passes through the light folding element, a small stroke change can achieve a large focal length change, which is conducive to improving the focusing ability of the optical lens, reducing the focusing stroke, and facilitating macro photography. If a lens in the second group is arranged after the light folding element, the light passing through the light folding element and then passing through the lens of the second group will increase the focus stroke, making it difficult to achieve macro photography. The embodiment of the present application can achieve telephoto photography of the optical lens by setting FOV < 50°. The light can be reflected multiple times in the light folding element, which is conducive to achieving the telephoto and miniaturization of the optical lens and can reduce the board area.

[0008] The optical lens of the present application is capable of not only long-range photography, but also close-range macro photography. The optical lens of the present application has a good shooting effect for objects with object distances ranging from infinity to macro. Among them, the optical lens of the present application has a small focusing stroke and high imaging quality when performing macro photography on objects with an object distance less than 100 mm.

[0009] In one possible implementation, during the focusing process, the moving directions of the first group and the second group are opposite, which is beneficial to shortening the focusing stroke, thereby reducing the difficulty of designing a driving member that drives the first group or the second group to move and reducing the size of the driving member, thereby miniaturizing the optical lens and having good imaging quality at macro distances.

[0010] In a possible implementation, the second group includes at least one lens with negative optical power. By setting the optical power of at least one lens in the second group to be negative, the focusing stroke can be reduced, the focusing ability is strong, and the image quality is good and the image clarity is high when shooting objects at different distances.

[0011] In a possible implementation, the first group has a positive optical power, and the second group has a negative optical power. The first group has a positive optical power, and the first group is used for light beam convergence, so that the diameter of the light beam entering the second group is smaller, and the aperture of the second group is no longer the maximum limitation of the light aperture, which is conducive to the miniaturization and large aperture design of the optical lens, effectively increases the light aperture, realizes a smaller aperture number, and can enhance the focusing ability, which is conducive to macro photography. The optical power of the second group is negative, which can reduce the focusing stroke and has a strong focusing ability. Reasonable configuration of the optical power of the first group and the second group is conducive to realizing the miniaturization, large aperture and telephoto characteristics of the optical lens, and is conducive to the realization of the focusing process of the optical lens from the distant view to the close view and improving the imaging quality of the optical lens.

[0012] In a possible implementation, the first group includes a first lens and a second lens, 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 a positive focal length, the second lens has a negative focal length, and the third lens has a negative focal length. Reasonable configuration of the focal lengths of the first lens, the second lens and the third lens is conducive to achieving features such as miniaturization, large aperture and telephoto of the optical lens, and is conducive to achieving the focusing process of the optical lens from far view to near view and improving the imaging quality of the optical lens.

[0013] In a possible implementation, the focal length F1 of the first group of the optical lens and the effective focal length EFL of the optical lens satisfy the following relationship: F1 / EFL≤0.9. By limiting the appropriate range of F1 / EFL, the focal length of the first group can be reasonably configured, which is conducive to shortening the focusing stroke, improving the focusing ability, and realizing macro photography, and having good image quality and high imaging clarity when shooting objects at different distances. In addition, by limiting F1 / EFL≤0.9, it is conducive to reducing the aperture number, realizing a large aperture design, improving the light aperture and ensuring good imaging quality.

[0014] In a possible implementation manner, the focal length F2 of the second group of the optical lens and the effective focal length EFL of the optical lens satisfy the following relationship: F2 / EFL>-1. In the implementation manner of the present application, by reasonably designing the ratio range of F2 / EFL, it is helpful to reduce the focus stroke and improve the focusing ability. In addition, by designing F2 / EFL in a suitable range, the optical lens can balance the image quality difference between the optical lens long-range shooting and close-range shooting at a smaller assembly sensitivity, and obtain a more uniform image quality.

[0015] In a possible implementation, the first group includes at least one lens with positive power, and the ratio of the at least one lens with positive power in the first group to the effective focal length of the optical lens is less than 1. By setting the ratio of the at least one lens with positive power in the first group to the effective focal length of the optical lens to be less than 1, it can be ensured that a small number of lenses in the first group can also provide sufficient focal power for the optical lens, and the size of the first group can be reduced, which is conducive to macro photography and is also conducive to the telephoto and miniaturization design of the optical lens.

[0016] In a possible implementation, the optical lens satisfies the following relationship: ImgH>2mm, where ImgH is the maximum image height of the optical lens. The implementation of the present application limits the range of ImgH so that the optical lens has the characteristics of a large target surface, and is conducive to achieving a higher imaging magnification and improving resolution.

[0017] In a possible implementation manner, the first group includes at least one lens having an Abbe number less than 40. By limiting the Abbe number of at least one lens in the first group to be less than 40, it is helpful to reduce chromatic aberration in the optical lens, so that the optical lens has good imaging quality.

[0018] In a possible implementation manner, the optical lens satisfies the following relationship: Fno<3.6, where Fno is the aperture number of the optical lens. The smaller the Fno, the larger the aperture, and the larger the Fno, the smaller the aperture. In the embodiment of the present application, by setting Fno<3.6, the optical lens has the characteristic of a large aperture.

[0019] In a possible implementation, the first group includes a lens with positive optical power, and the material of the lens with positive optical power and the smallest focal length in the first group is glass. By setting the lens with positive optical power and the smallest focal length in the first group to be glass, it is beneficial to reduce the size of the optical lens, realize the miniaturization of the optical lens, and is beneficial to reduce the temperature drift coefficient, reduce the temperature drift effect, and improve the imaging quality of the optical lens.

[0020] In a possible implementation, the Abbe number of the lens in the second group is different from the Abbe number of the light folding element, which is beneficial for correcting chromatic aberration at object distances from infinity to macro and improving imaging quality.

[0021] In one possible implementation, the optical path length of the light passing through the optical axis of the first group in the optical folding element is greater than twice the maximum image height, which is beneficial for multiple folding of the light, increasing the optical path, reducing the volume of the optical lens, and realizing the miniaturization of the optical lens.

[0022] In a possible implementation manner, the first group includes a turning element, which is located on the object side of the optical lens and is used to change the direction of the light entering the first group. The turning element allows the propagation direction of the light in the first group to be different from the direction in which the light enters the turning element, thereby making the placement position, angle, space, etc. of the optical lens more flexible.

[0023] In a second aspect, the present application also provides a camera module, comprising a photosensitive element and any of the above optical lenses, wherein the photosensitive element is located on the image side of the optical lens and on the focal plane of the optical lens. The camera module has the characteristics of telephoto, miniaturization, and wide object distance imaging.

[0024] In a third aspect, the present application also provides an electronic device, comprising an image processor and the above-mentioned camera module, wherein the image processor is communicatively connected to the camera module, and the image processor is used to obtain image data from the camera module and process the image data. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following is an introduction to the drawings used in the embodiments of the present application.

[0026] Figure 1 is a schematic diagram of an electronic device provided in one embodiment of the present application;

[0027] Figure 2 is a structural schematic diagram of the camera module provided in the first embodiment of the present application in a working state; Figure 3 is a structural schematic diagram of the camera module provided in the first embodiment of the present application in another working state; Figure 4 is a representation diagram of the optical performance of the optical lens in the first embodiment of the present application when the object distance is infinite; Figure 5 is a representation diagram of the optical performance of the optical lens in the first embodiment of the present application when the object distance is 68 mm; Figure 6 is a structural schematic diagram of a camera module provided in a second embodiment of the present application in a working state; Figure 7 is a structural schematic diagram of a camera module provided in the second embodiment of the present application in another working state; Figure 8 is a representation diagram of the optical performance of the optical lens in the second embodiment of the present application when the object distance is infinite; Fig. 9 is a representation diagram of the optical performance of the optical lens in the second embodiment of the present application when the object distance is 100 mm; Fig.10 is a structural schematic diagram of a camera module provided in a third embodiment of the present application in a working state; Fig.11 is a structural schematic diagram of a camera module provided in the third embodiment of the present application in another working state; Fig.12 is a representation diagram of the optical performance of the optical lens in the third embodiment of the present application when the object distance is infinite; Fig.13 is a representation diagram of the optical performance of the optical lens in the third embodiment of the present application when the object distance is 100 mm; Fig.14 is a structural schematic diagram of a camera module provided in a fourth embodiment of the present application in a working state; Fig.15 is a structural schematic diagram of a camera module provided in the fourth embodiment of the present application in another working state; Fig.16 is a representation diagram of the optical performance of the optical lens in the fourth embodiment of the present application when the object distance is infinite; Fig.17 is a representation diagram of the optical performance of the optical lens in the fourth embodiment of the present application when the object distance is 100 mm; Fig.18 is a structural schematic diagram of a camera module provided in a fifth embodiment of the present application in a working state; Fig.19 is a structural schematic diagram of a camera module provided in the fifth embodiment of the present application in another working state; Fig. 20 is a representation diagram of the optical performance of the optical lens in the fifth embodiment of the present application when the object distance is infinite; Fig.21 is a representation diagram of the optical performance of the optical lens in the fifth embodiment of the present application when the object distance is 68 mm; Fig. 22 is a structural schematic diagram of a camera module provided in a sixth embodiment of the present application in a working state; Fig.23 is a structural schematic diagram of a camera module provided in a sixth embodiment of the present application in another working state; Fig.24 is a representation diagram of the optical performance of the optical lens in the sixth embodiment of the present application when the object distance is infinite; Fig.25 It is a characterization diagram of the optical performance of the optical lens in the sixth embodiment of the present application when the object distance is 68 mm. DETAILED DESCRIPTION

[0028] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0029] Focal power is equal to the difference between the image-side light beam convergence and the object-side light beam convergence. It characterizes the ability of an optical system to deflect light.

[0030] A lens or lens group with positive optical power has a positive focal length and has the effect of converging light.

[0031] A lens or lens group with negative optical power has a negative focal length and has the effect of diverging light.

[0032] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical system. It refers to the vertical distance from the optical center of a lens or lens group to the focal plane when an infinitely distant scene forms a clear image on the focal plane through a lens or lens group. For a thin lens, the focal length is the distance from the center of the lens to the imaging plane; for a thick lens or lens group, the focal length is equal to the effective focal length, which is the distance from the rear principal plane of the lens or lens group to the imaging plane.

[0033] The object side, with the lens as the boundary, is the side where the scene to be imaged is located.

[0034] The image side is the side where the image of the scene to be imaged is located, with the lens as the boundary.

[0035] The object side is bounded by the lens. The side where the photographed object is located is the object side, and the surface of the lens close to the object side is called the object side, also known as the object plane.

[0036] The image side, with the lens as the boundary, the side where the image of the object is located is called the image side, and the surface of the lens close to the image side is called the image side, also known as the image plane.

[0037] The imaging plane is located on the image side of all lenses in the optical lens, and is the plane on which the image is formed after the light passes through each lens in the optical lens in sequence.

[0038] The aperture is a device used to control the amount of light that passes through the lens and enters the photosensitive surface inside the camera body. It is usually inside the lens.

[0039] Aperture number, also known as F number (Fno), is a relative value obtained by dividing the focal length of the lens by the diameter of the lens entrance pupil (the inverse of the relative aperture). The smaller the aperture value, the more light enters in the same unit time. The larger the aperture value, the smaller the depth of field, and the background content of the photo will be blurred, similar to the effect of a telephoto lens.

[0040] The Abbe number, or dispersion coefficient, is the difference ratio of the refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0041] Aberration: The paraxial region of the optical system has the properties of an ideal optical system. The paraxial light emitted from a point on the object intersects the image plane at one point (also known as the paraxial image point). However, the light rays that actually pass through different apertures of the lens are difficult to intersect perfectly at one point, but have a certain deviation from the position of the paraxial image point. These differences are collectively called aberrations.

[0042] The optical axis is a ray of light that passes vertically through the center of an ideal lens. When a ray of light parallel to the optical axis enters a convex lens, the ideal convex lens should have all the light rays converge at one point behind the lens. This point where all the light rays converge is the focus. When light propagates along the optical axis, its transmission direction does not change.

[0043] Axial chromatic aberration (longitudinal spherical aberration), also known as longitudinal chromatic aberration or position chromatic aberration or axial aberration, is a beam of light parallel to the optical axis that converges at different positions before and after passing through the lens. This aberration is called position chromatic aberration or axial chromatic aberration. This is because the positions of the images of the light of each wavelength are different, so that the focal planes of the image side of the light of different colors cannot overlap when the final image is formed, and the complex light spreads out to form dispersion.

[0044] Distortion, also known as distortion, is the degree of distortion of the image formed by the optical system on an object relative to the object itself. Distortion is due to the influence of aperture spherical aberration. The height of the intersection of the main light of different fields of view with the Gaussian image plane after passing through the optical system is not equal to the ideal image height. The difference between the two is the distortion. Therefore, distortion only changes the imaging position of the off-axis object point on the ideal plane, causing the shape of the image to be distorted, but does not affect the clarity of the image.

[0045] Astigmatism, because the object point is not on the optical axis of the optical system, the light beam it emits has an inclination angle with the optical axis. After the light beam is refracted by the lens, the convergence point of its meridional beamlet and sagittal beamlet is not at the same point. That is, the light beam cannot be focused on one point, and the image is not clear, so astigmatism occurs. Meridian beamlet and sagittal beamlet are the names of light beams in two perpendicular planes in a rotationally symmetric optical system.

[0046] Field curvature is used to indicate the difference between the clearest image point position of the non-central field of view light after passing through the optical lens group and the clearest image point position of the central field of view on the optical axis. When the lens has field curvature, the intersection point of the entire light beam does not coincide with the ideal image point. Although a clear image point can be obtained at each specific point, the entire image plane is a curved surface.

[0047] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings. The solutions described in this application are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application. Among them, in the description of the embodiments of the present application, the terms "first", "second" and the like are used only for descriptive purposes and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0048] The present 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 and a second group, and the light passes through the first group and the second group in sequence. The optical focal length of the first group is opposite to that of the second group. For example, the first group can have a positive focal length, and the second group can have a negative focal length, or the first group can have a negative focal length, and the second group can have a positive focal length. The first group includes at least two lenses, which is conducive to correcting chromatic aberration; the second group includes at least one lens and a light folding element, and the lens of the second group is located between the first group and the light folding element. The light emitted from the first group passes through the lens of the second group and the light folding element in sequence, and the light is reflected multiple times in the light folding element. The first group and / or the second group are focusing lens groups. During the focusing process of the optical lens from the far view to the near view, the distance between the first group and the second group increases; the optical lens satisfies the following relationship: FOV<50°, and FOV is the field of view angle of the optical lens when the object distance is infinite. The optical lens in the embodiment of the present application has the characteristics of miniaturization and telephoto, and can have good imaging effects from infinity to macro.

[0049] The present application provides an electronic device 1000, which may be a mobile phone, a tablet, a wearable device, or other device with a photo or video function. The electronic device 1000 may include at least one camera module 100. Figure 1 , Figure 1 FIG. 1 is a schematic diagram of the structure of an electronic device 1000 of the present application. Figure 1 Take two camera modules 100 as an example. In the embodiment of the present application, the electronic device 1000 is described as a mobile phone.

[0050] The electronic device 1000 includes a camera module 100 and an image processor 200 that is communicatively connected to the camera module 100. The camera module 100 is used to acquire image data and input the image data into the image processor 200, and the image processor 200 can process the acquired image data. The communication connection between the camera module 100 and the image processor 200 may include data transmission through electrical connection methods such as wiring, or data transmission may be achieved through coupling and the like. It is understandable that the camera module 100 and the image processor 200 may also achieve communication connection through other methods that can achieve data transmission.

[0051] 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 function is to transmit the data obtained by the photosensitive chip to the central processor in a timely and fast manner and refresh the photosensitive chip. Therefore, the quality of the image processor 200 chip directly affects the picture quality (such as color saturation, clarity, etc.).

[0052] In some embodiments, the electronic device 1000 includes a display screen (not shown in the figure), which is a module for the electronic device 1000 to display images. The display screen includes but is not limited to a flexible display screen, a hard display screen, a bendable display screen, a stretchable display screen, and the like. The types of display screens include but are not limited to liquid crystal display screens, light-emitting diode display screens, organic light-emitting diode display screens, and the like. The display screen is provided on the front of the electronic device 1000, and the front of the electronic device 1000 is also the side that the user faces when using the electronic device 1000 normally. The camera module 100 can be provided on the side where the display screen is located, as a front camera of the electronic device 1000. The camera module 100 can also be provided on the back of the electronic device 1000, and the camera module 100 serves as a rear camera of the electronic device 1000. Both the front camera and the rear camera can be used for self-portraits, and can also be used by the photographer to take pictures of other objects.

[0053] In some embodiments, the electronic device 1000 may include a housing 300, and the housing 300 may include a frame 31 and a rear cover plate 32. The frame 31 and the rear cover plate 32 may be an integrally formed structure, or may be an integrally formed structure formed by an assembly method. The display screen and the rear cover plate 32 are respectively connected to opposite sides of the frame 31, and the rear cover plate 32, the frame 31 and the display screen are surrounded and connected to form a storage space that can accommodate an image processor, a battery, etc., and at least a portion of the camera module 100 is disposed in the storage space. The rear cover plate 32 may be provided with an opening, and when the camera module 100 can be disposed on the rear cover plate 32, one end of the camera module 100 is disposed in the opening to ensure that light outside the electronic device 1000 can enter the camera module 100, so that the camera module 100 can be used as a rear lens of the electronic device 1000 to achieve the shooting of the scene.

[0054] 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 digital image signal is then processed by the image processor 200, and finally the image or video is displayed through a display screen or monitor.

[0055] In some embodiments, the electronic device 1000 includes a memory (not shown), which is in communication with the image processor 200. The image processor 200 processes the image digital signal and then transmits the image to the memory, so that the image can be searched from the storage at any time and displayed on the display screen when the image needs to be viewed later. In some embodiments, the image processor 200 also compresses the processed image digital signal and stores it in the memory to save memory space.

[0056] Understandably, Figure 1 The installation position of the camera module 100 of the electronic device 1000 in the illustrated embodiment is merely schematic, and the present 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 at other positions of the electronic device 1000. Exemplarily, the camera module may also be arranged at the upper left corner or the middle of the upper part of the rear cover 32. In some other embodiments, the camera module 100 may also not be arranged on the mobile phone body, but on a structural member that is movable or rotatable relative to the mobile phone, for example, the camera module 100 can be extended, retracted or rotated from the mobile phone body together with the structural member. The present application does not make any limitation on the installation position of the camera module 100. The present application only schematically represents the position, size, dimensions, etc. of the camera module 100, which can be adjusted as needed.

[0057] like Figure 2 As shown, Figure 2 A schematic diagram of the structure of the camera module provided in the first embodiment of the present application in a 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 the embodiment of the present application, the working process of the camera module 100 in the electronic device 1000 is as follows: the light reflected by the photographed scene enters the optical lens 10 to generate an optical image 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 as to be converted into a digital image signal to the image processor 200 through the analog-to-digital converter 400, and the image processor may operate 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, and display the image or video through the display screen.

[0058] The photosensitive element 20 (also called an image sensor) is a semiconductor chip, which contains hundreds of thousands to millions of photodiodes on its surface. When exposed to light, it will generate electric charge. The photosensitive element 20 can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). A charge coupled device is made of a highly sensitive semiconductor material and can convert light into electric charge. A charge coupled device is composed of many photosensitive units, usually in units of millions of pixels. When the surface of the charge coupled device is exposed to light, each photosensitive unit will reflect the charge on the component, and the signals generated by all the photosensitive units are added together to form a complete picture. Complementary metal oxide semiconductor devices mainly use semiconductors made of two elements, silicon and germanium, so that semiconductors with N (-charged) and P (+charged) levels coexist on the complementary metal oxide semiconductor device. The current generated by these two complementary effects can be processed by the image sensor to record and interpret it into an image.

[0059] In some embodiments, the optical lens 10 may include a driving member (not shown), which may be a motor. Exemplarily, the driving member may be a voice coil motor. The driving member may drive the optical lens 10 to achieve a focusing or zooming function to accurately form an image on the photosensitive element 20.

[0060] 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. The light passing through the optical lens 10 is incident on the filter 30, and the light passing through the filter 30 is imaged on the photosensitive element 20. The filter 30 is used to filter out unnecessary bands in the light to prevent the photosensitive element 20 from generating false colors or ripples, so as to improve its effective resolution and color reproduction. Exemplarily, the filter 30 may be an infrared filter. In this embodiment, the filter 30 is an independent component. In some other embodiments, the filter structure may be eliminated, 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 structural members or structures used to achieve filtering.

[0061] Please refer to Figure 2 and Figure 3 , Figure 3 A schematic diagram of the structure of the camera module provided in the first embodiment of the present application in another working state. Figure 2 2 is the long-range working state of the camera module 100 of the first embodiment of the present application when the object distance is infinite. Figure 3 Detailed description is given in FIG. 1 , which shows the close-up working state of the camera module 100 of the first embodiment of the present application during macro shooting.

[0062] In the embodiment of the present application, the optical lens 10 includes a first group 11 and a second group 12 arranged in sequence along the optical axis O, and the light entering the optical lens 10 passes through the first group 11 and the second group 12 in sequence. The first group 11 and the second group 12 have opposite optical powers. Exemplarily, the first group 11 may have positive optical power, and the second group 12 may have negative optical power, or the first group 11 may have negative optical power, and the second group 12 may have positive optical power.

[0063] The first group 11 may include at least two lenses, which is beneficial for correcting chromatic aberration. For example, the first group 11 may include a first lens L1 and a second lens L2 arranged in sequence along the optical axis O, and the second lens L2 is located between the first lens L1 and the second group 12. It can 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.

[0064] The second group 12 may include a third lens L3 and a light folding element 121. The second group 12 may include at least one lens. It is understood that in other embodiments, the second group 12 may also include two, three, or four lenses, etc., which is not limited in the present application. The light may be reflected multiple times in the light folding element 121, and multiple times may be understood as at least twice.

[0065] In some embodiments, the lenses of the second group 12 may be located between the first group 11 and the light folding element 121, and the light emitted from the first group 11 passes through the lenses of the second group 12 and the light folding element 121 in sequence. It can be understood that the light entering the optical lens 10 enters the lenses of the first group 11, the second group 12 and the light folding element 121 in sequence. By arranging the lenses of the second group 12 adjacent to the first group 11, that is, the light first passes through the lenses of the second group 12 and then passes through the light folding element 121, it is beneficial to improve the focusing ability of the optical lens 10, reduce the focusing stroke, and facilitate macro photography. If a lens in the second group 12 is arranged after the light folding element 121, the light passing through the light folding element 121 and then passing through the lenses of the second group 12 will increase the focusing stroke, making it difficult to achieve macro photography.

[0066] The first group 11 and / or the second group 12 may be a focusing lens group. In the process of focusing the optical lens 10 from the object distance infinity (long shot) to the macro shot (close shot), the first group 11 and / or the second group 12 may be moved to achieve focusing. For example, the first group 11 may be moved along the optical axis O toward the object side of the optical lens 10 and / or the second group 12 may be moved along the optical axis O away from the object side of the optical lens 10 to increase the distance between the first group 11 and the second group 12 to achieve focusing. The distance between the first group 11 and the second group 12 in the direction of the optical axis O increases, and the effective focal length of the optical lens 10 decreases.

[0067] In the embodiment of the present application, the field of view FOV of the optical lens 10 when the object distance is infinite satisfies: FOV < 50°. For example, the value of FOV can be 45°, 35°, 25° or 20°, etc. By setting the equivalent focal length of the optical lens 10, the optical lens 10 of the present application has a telephoto characteristic.

[0068] The present application defines that the optical focal powers of the first group 11 and the second group 12 are opposite, defines that the second group 12 includes at least one lens and an optical folding element 121, defines that the first group 11 and / or the second group 12 are focusing groups, and defines the range of the equivalent focal length of the optical lens 10 in the infinite working state, so that the optical lens 10 has the characteristics of miniaturization, small board area, and long focus, and has good imaging effects from infinity to macro.

[0069] In the embodiment of the present application, by setting the first group 11 and the second group 12 to have opposite optical focal lengths, it is beneficial to achieve focusing and macro focusing, can reduce the focusing stroke, have strong focusing ability, and is beneficial to improving the overall image quality of the optical system during close-up imaging, increasing the amount of light entering the system, promoting macro imaging, and balancing the difference in imaging quality between long-range shooting and close-up shooting. In the embodiment of the present application, the light is folded multiple times in the light folding element 121, which can increase the optical path of the light in the optical lens 10 to ensure that the optical lens 10 can have a telephoto effect, and realize that the optical lens 10 can be miniaturized while having a large focal length.

[0070] The optical lens 10 of the present application is capable of not only long-range photography, but also close-range macro photography. The optical lens 10 of the present application has good shooting effects for objects with object distances ranging from infinity to macro. Among them, the optical lens 10 of the present application has a small focusing stroke and high imaging quality when performing macro photography on objects with object distances less than 100 mm.

[0071] In some embodiments, the first group 11 and the photosensitive element 20 may be on the same side of the light folding element 121. During the focusing process, the first group 11 may be moved along the optical axis O to achieve focusing, while the second group 12 does not move; the second group 12 may be moved along the optical axis O to achieve focusing, while the first group 11 does not move; or both the first group 11 and the second group 12 may be moved along the optical axis O to achieve focusing. During the process of the optical lens 10 switching from a distant view to a close view, the second group 12 may be moved along the optical axis O away from the object side, or the first group 11 may be moved along the optical axis O toward the object side, or the first group 11 may be moved along the optical axis O toward the object side and the second group 12 may be moved along the optical axis O away from the object side, so as to increase the distance between the first group 11 and the second group 12 to achieve macro imaging. In the embodiment of the present application, the first group 11 and the second group 12 have opposite optical focal powers. Only a small distance between the first group 11 and the second group 12 needs to be changed to achieve a large change in the focal length of the optical lens 10, which is beneficial to reducing the focusing stroke, so that the optical lens 10 can have better imaging quality in close-up shots and achieve macro imaging.

[0072] In some embodiments, the first group 11 and the photosensitive element 20 may be on different sides of the light folding element 121, and the first group 11 may be a focus group. It is understandable that when the first group 11 and the photosensitive element 20 are on different sides of the light folding element 121, the light folding element 121 is located between the first group 11 and the photosensitive element 20, and the space in which the light folding element 121 can move is small, which affects macro imaging. Therefore, in the embodiment of the present application, focusing can be achieved by moving the first group 11, and the distance between the first group 11 and the second group 12 is increased, which is conducive to macro imaging.

[0073] In some embodiments, the moving directions of the first group 11 and the second group 12 are opposite, which can shorten the moving distance of the first group 11 and / or the second group 12, facilitate macro imaging, and improve the imaging quality of the optical lens 10 at a wide object distance (from infinity to macro). In addition, since the travel required for focusing of the optical lens 10 is relatively small, it is also beneficial to reduce the volume of the driving member that drives the first group 11 or the second group 12 to move, making it easier to miniaturize the camera module 100. The optical lens 10 of the embodiment of the present application can achieve telephoto, miniaturization, and wide object distance imaging at an object distance of from infinity to macro.

[0074] In some embodiments, during the focusing process of the optical lens 10 from macro to infinite object distance, the first group 11 and / or the second group 12 may be a focusing lens group, and the distance between the first group 11 and the second group 12 in the direction of the optical axis O decreases.

[0075] In some embodiments, the second group 12 may include at least one lens with negative optical power. By setting the optical power of at least one lens in the second group 12 to be negative, the focusing stroke can be reduced, the focusing ability is strong, and good image quality and high imaging clarity are achieved when photographing objects at different distances.

[0076] In some embodiments, the first group 11 has a positive optical power, and the second group 12 has a negative optical power. The first group 11 has a positive optical power, and the first group 11 is used for light beam convergence, so that the diameter of the light beam entering the second group 12 is smaller, and the aperture of the second group 12 is no longer the maximum limit of the light aperture, which is conducive to the miniaturization and large aperture design of the optical lens 10, effectively increases the light aperture, realizes a smaller aperture number, and can enhance the focusing ability, which is conducive to macro photography. The optical power of the second group 12 is negative, which can reduce the focusing stroke and has a strong focusing ability. Reasonable configuration of the optical power of the first group 11 and the second group 12 is conducive to realizing the miniaturization, large aperture and telephoto characteristics of the optical lens 10, and is conducive to the realization of the focusing process of the optical lens 10 from the distant view to the near view and improving the imaging quality of the optical lens 10.

[0077] In a 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 in sequence, the first lens L1 has a positive focal power, the second lens L2 has a negative focal power, and the third lens L3 has a positive focal power. Reasonable configuration of the focal powers of the first lens L1, the second lens L2, and the third lens L3 is conducive to achieving the miniaturization, large aperture, and telephoto features of the optical lens 10, and is conducive to achieving the focusing process of the optical lens 10 from the distant view to the near view and improving the imaging quality of the optical lens 10.

[0078] In some embodiments, the optical lens 10 satisfies the following relationship: F1 / EFL≤0.9, F1 is the focal length of the first group 11, and EFL is the effective focal length of the optical lens 10. Exemplarily, the value of F1 / EFL can be 0.3, 0.4, 0.5, 0.6, 0.7 or slightly greater than 0.9, such as 0.95. By limiting the appropriate range of F1 / EFL, the optical focal length of the first group 11 can be reasonably configured, which is conducive to shortening the focusing stroke, having a strong focusing ability, and being conducive to macro photography, and having good image quality and high imaging clarity when shooting objects at different distances. In addition, by limiting F1 / EFL≤0.9, it is conducive to reducing the aperture number, realizing a large aperture design, improving the aperture, and ensuring good imaging quality.

[0079] In one embodiment, the optical lens 10 satisfies the following relationship: F2 / EFL>-1, F2 is the focal length of the second group 12, and EFL is the effective focal length of the optical lens 10. In the embodiment of the present application, by reasonably designing the ratio range of F2 / EFL, it is helpful to reduce the focus stroke and improve the focusing ability. In addition, by limiting the range of F2 / EFL, the optical lens 10 can balance the image quality difference between the long-range shooting and the close-range shooting of the optical lens 10 under a smaller assembly sensitivity, and obtain a more uniform image quality.

[0080] In some embodiments, the first group 11 includes at least one lens with positive power, and the ratio of the at least one lens with positive 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 at least one lens with positive 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 a small number of lenses in the first group 11 can also provide sufficient focal power for the optical lens 10, and the size of the first group 11 can be reduced, which is conducive to macro photography and is also conducive to the telephoto and miniaturization design of the optical lens 10.

[0081] 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. Exemplarily, the maximum image height of the optical lens 10 can be 3mm, 4mm, 6mm, 8mm, or 10mm. The embodiment of the present application limits the range of ImgH so that the optical lens 10 has the characteristics of a large target surface, and is conducive to achieving a higher imaging magnification and improving resolution.

[0082] 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. By limiting the Abbe number of at least one lens in the first group 11 to be less than 40, it is helpful to reduce the chromatic aberration in the optical lens 10, so that the optical lens 10 has good imaging quality.

[0083] In some embodiments, the aperture number Fno of the optical lens 10 satisfies: Fno<3.6. Fno can be a value such as 1.5, 2.0, 2.3 or 2.8. When Fno is small, the aperture is large, and when Fno is large, the aperture is small. In the embodiment of the present application, by setting Fno<3.6, the optical lens 10 has the characteristic of a large aperture.

[0084] In a possible implementation, the first group 11 includes a lens with positive power, and the material of the lens with the smallest focal length and positive power in the first group 11 is glass. By setting the lens with the smallest focal length and positive power in the first group 11 to be glass, it is helpful to reduce the size of the optical lens 10, realize the miniaturization of the optical lens 10, and help reduce the temperature drift coefficient, reduce the temperature drift effect, and improve the imaging quality of the optical lens 10.

[0085] In some embodiments, the Abbe number of the lenses in the second group 12 is different from the Abbe number of the light folding element 121, which is beneficial for correcting chromatic aberration at object distances from infinity to macro and improving imaging quality.

[0086] In some embodiments, the optical path length of the light passing through the optical axis of the first group 11 in the optical folding element 121 is greater than twice the maximum image height, which is beneficial for multiple folding of the light, increasing the optical path, reducing the volume of the optical lens 10, and realizing the miniaturization of the optical lens 10.

[0087] In some embodiments, the light folding element 121 may have multiple reflective surfaces. When the incident angle of light on the reflective surface of the light folding element 121 is less than the critical angle of the light folding element 121, the reflective surface of the light folding element 121 may be processed, for example, a reflective coating may be coated on the reflective surface. When the reflective coating is not provided on the reflective surface of the light folding element 121, the light reflection effect is poor and the light utilization rate is low. The reflective coating may be formed by coating, sputtering, vapor deposition, etc., or by directly pasting a reflective film.

[0088] In some embodiments, the light folding element 121 may include a prism, wherein the prism includes at least two spliced ​​sub-prisms, and the at least two sub-prisms may be fixedly connected using an optical adhesive.

[0089] In some embodiments, the light folding element 121 may be a triangular prism, a parallelogram prism, a trapezoidal prism, or other elements that can provide the above-mentioned light folding function and design benefits. The present application does not limit the specific shape of the light folding element 121.

[0090] In some embodiments, the first group 11 includes a turning element (not shown), which may be located on the object side of the optical lens 10, and the light entering the optical lens 10 passes through the turning element before passing through the first group 11. The turning element may be used to change the direction of the light entering the first group 11. The turning element makes the propagation direction of the light in the first group 11 different from the direction in which the light enters the turning element, thereby making the placement position, angle, and space of the camera module 100 more flexible.

[0091] In some embodiments, the lenses in the first group 11 and the lenses in the second group 12 may both be made of plastic material, or both be made of glass material, or some lenses may be made of plastic material and some lenses may be made of glass material.

[0092] In some embodiments, the object-side surfaces or image-side surfaces of the lenses in the first group 11 and the lenses in the second group 12 may be spherical surfaces or aspherical surfaces.

[0093] In some embodiments, when the object side surface and / or image side surface of some lenses in the optical lens 10 are aspherical surfaces, the object side surface and / or image side surface of some lenses may be defined by, but not limited to, the following aspherical surface formula:

[0094] in z ( x , y ) is the optical surface sagittal height; k is the cone coefficient; c is the radius of curvature; r is the radius height in the direction of the optical axis; r 2 = x 2 + y 2 ; α i are the polynomial coefficients; r i is the normalized radial coordinate.

[0095] The following will be combined with six embodiments Figures 2 to 25 Some specific but non-limiting examples of the present application are described in more detail.

[0096] First embodiment: Please combine Figure 2 and Figure 3In the embodiment of the present application, the camera module 100 includes an optical lens 10, a filter 30 and a photosensitive element 20. Light passes through the optical lens 10 and the filter 30 in sequence and then forms an image on the photosensitive element 20. The optical lens 10 includes an aperture STO, a first group 11 and a second group 12 arranged in sequence along the optical axis O. The aperture STO 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 on the image side or other positions of the first lens L1, which is not limited in the present application.

[0097] The first group 11 may have positive power, and may include a first lens L1 and a second lens L2 arranged in sequence along the optical axis O. The first lens L1 may have positive power, and may include an object-side surface S1 and an image-side surface S2. The second lens L2 may have negative power, and may include an object-side surface S3 and an image-side surface S4.

[0098] The second group 12 may have negative refractive power, and may include a third lens L3 and a light folding element 121 sequentially arranged along the optical axis O. The third lens L3 may have negative refractive power, and may include an object-side surface S5 and an image-side surface S6.

[0099] In this embodiment, the first lens L1 can be made of plastic material, the second lens L2 can be made of plastic material, and the third lens L3 can be made of plastic material. In other embodiments, the first lens L1, the second lens L2 and the third lens L3 can all be made of glass material, or include both glass material and plastic material, which is not limited in the present application.

[0100] The light folding element 121 may include an incident surface S7, a first reflection surface S8, a second reflection surface S9, a third reflection surface S10 and an exit surface S11. The incident surface S7, the second reflection surface S9 and the exit surface S11 may be coplanarly connected to form a surface, and any two adjacent surfaces among the incident surface S7, the second reflection surface S9 and the exit surface S11 may at least partially overlap. Exemplarily, the incident surface S7 and the second reflection surface S9 may be coplanar, and the incident surface S7 and the second reflection surface S9 may partially overlap, so that the light can be transmitted into the light folding element 121 from the overlapping area of ​​the incident surface S7 and the second reflection surface S9, and the light can also be reflected from the overlapping area of ​​the incident surface S7 and the second reflection surface S9. In other embodiments, the incident surface S7, the second reflection surface S9 and the exit surface S11 may not be coplanar, and any two adjacent surfaces among the incident surface S7, the second reflection surface S9 and the exit surface S11 may not overlap, and the present application does not limit this. The light emitted through the first group 11 may be reflected and folded three times in the light folding element 121 before reaching the photosensitive element 20. After passing through the third lens L3, the light from the first group 11 may pass through the incident surface S7 and enter the light folding element 121. At least a portion of the light passing through the incident surface S7 is reflected at the first reflection surface S8, and the light is reflected for the first time; at least a portion of the light reflected from the first reflection surface S8 is reflected at the second reflection surface S9, and the light is reflected for the second time; at least a portion of the light reflected from the second reflection surface S9 is reflected at the third reflection surface S10, and the light is reflected for the third time, so that at least a portion of the light passes through the exit surface S11 and is emitted from the light folding element 121 to the photosensitive element 20.

[0101] In an embodiment of the present application, the light folding element 121 may include a trapezoidal cylindrical prism, and illustratively, may be an isosceles trapezoidal cylindrical prism. The first reflecting surface S8 and the third reflecting surface S10 may be two waists 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 exit surface S11 may be 33°. In other embodiments, the light folding element 121 may be a triangular, quadrilateral prism or other element capable of folding the light path, and the angle between the incident surface S7 of the light folding element 121 and the first reflecting surface S8 or the angle between the third reflecting surface S10 and the exit surface S11 may also be 30° or 45°, etc., which is not limited in the present application.

[0102] The first reflective surface S8 and the third reflective surface S10 may include a reflective coating. Exemplarily, the reflective coating may include a mirror coating based on a thin metal layer or a film with a white inner surface, etc., for improving the ability of the first reflective surface S8 and the third reflective surface S10 to reflect light.

[0103] In addition, the filter 30 may include an object side surface S12 and an image side surface S13. Figure 2 and Figure 3 The image plane is the plane on which the image is formed after the light sequentially passes through each lens in the optical lens 10. The photosensitive element 20 is located at the image plane S14.

[0104] In this embodiment, the first group 11 and the photosensitive element 20 can be located on the same side of the optical folding element 121. When the camera module 100 switches from the telephoto state to the macro state, the first group 11 can move along the optical axis O toward the object side of the optical lens 10, and the second group 12 does not move, or the second group 12 can move along the optical axis O away from the object side of the optical lens 10, and the first group 11 does not move, or the first group 11 can move along the optical axis O toward the object side of the optical lens 10, and the second group 12 can move along the optical axis O away from the object side of the optical lens 10, so as to increase the distance between the first group 11 and the second group 12 to achieve focusing. In the first embodiment, by Figure 2 The perspective state shown is Figure 3 In the close-up state shown, focusing can be achieved by moving the first group 11 .

[0105] See 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 the optical lens 10 is in the infinite working state. The Abbe number is also the dispersion coefficient. Wherein, OBJ represents the object plane of the optical lens 10.

[0106] Table 1a

[0107] Please refer to Table 1b, which shows the aspheric coefficients of each lens of the optical lens 10 of the first embodiment.

[0108] Table 1b

[0109] Among them, symbols such as A4, A6, A8, A10, A12, A14 and A16 represent aspheric coefficients. It should be noted that the parameters in the table are expressed in scientific notation. For example, 1.365E-06 means 1.365×10 -6 It should be noted that when symbols such as A4, A6, A8, A10, A12, A14 and A16 appear again in the following, unless otherwise explained, their meanings are the same as here and will not be repeated in the following.

[0110] In this embodiment, the object-side surfaces and the image-side surfaces of the first lens L1 to the third lens L3 are all aspherical surfaces, which can be defined by but not limited to the following aspherical surface formula:

[0111] in z ( x , y ) is the optical surface sagittal height; k is the cone coefficient; c is the radius of curvature; r is the radius height in the direction of the optical axis;r 2 = x 2 + y 2 ; α i are the polynomial coefficients; r i are the normalized radial coordinates, and A4, A6, A8, A10, A12, A14, and A16 are the aspheric coefficients.

[0112] Please refer to Table 1c, which is Figure 2 The basic parameters of the optical lens 10 when the object distance is infinite are shown: 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.

[0113] Table 1c

[0114] See also Figure 4 , Figure 4 It is a representation diagram of the optical performance of the optical lens 10 in the first embodiment when the object distance is infinite.

[0115] in, Figure 4 It includes an axial aberration curve diagram, an astigmatism field curvature diagram and a distortion diagram of the optical lens 10. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate at the pupil. Figure 4 The values ​​shown in the figure are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the abscissa is the deviation value along the optical axis, and the ordinate is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Figure 4 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Figure 4 All shown are within 1%, ensuring that there is no obvious distortion of the image.

[0116] See also Figure 5 , Figure 5 It is a representation diagram of the optical performance of the optical lens 10 in the first embodiment when the object distance is 68 mm.

[0117] in, Figure 5 It includes an axial aberration curve diagram, an astigmatism field curvature diagram, and a distortion diagram of the optical lens 10 when the object distance is 68 mm. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the diagram), Figure 5 The values ​​shown in the middle are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, and Y is the meridian direction light beam. When a field value is too large, the image quality of the field of view is poor or there are high-level aberrations. Figure 5 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point of the beam in different fields of view (actual image height) and the ideal image height. Figure 5 The distortion shown is within 1%, ensuring that there is no obvious deformation of the picture.

[0118] according to Figure 4 and Figure 5 It can be seen that the optical lens 10 provided in the first embodiment can achieve good imaging quality when the object distance is infinite and when the object distance is 68 mm at a macro distance.

[0119] In this embodiment, when the optical lens 10 switches from a distant view to a close view, for example, when switching to a macro distance of 68 mm, the spacing between the first group 11 and the second group 12 increases, and the focus stroke of the first group 11 is 1.43 mm, the focus stroke is short, the focus effect is good, and a good macro shooting effect can be achieved. In the embodiment of the present application, the EFL is 17.2 mm, the Fno is 2.6, and the FOV is 25°. The optical lens 10 of the present application has the characteristics of a telephoto and a large aperture.

[0120] Second embodiment: Please combine Figure 6 and Figure 7 , Figure 6 is a structural schematic diagram of the camera module 100 provided in the second embodiment of the present application in a working state, Figure 7 It is a structural diagram of the camera module 100 provided in the second embodiment of the present application in another working state. Figure 6 2 is the long-range working state of the camera module 100 of the second embodiment of the present application when the object distance is infinite. Figure 7 The middle is the close-up working state of the camera module 100 of the second embodiment of the present application when shooting at a macro distance (100mm).

[0121] In the embodiment of the present application, the camera module 100 includes an optical lens 10, a filter 30 and a photosensitive element 20. In the present embodiment, light passes through the optical lens 10 and the filter 30 in sequence to form an image on the photosensitive element 20. The optical lens 10 includes an aperture STO, a first group 11 and a second group 12 arranged in sequence along the optical axis O. The aperture STO can be located on the object side of the first lens L1. In other embodiments, the aperture STO can also be located on the image side or other positions of the first lens L1, and the present application does not limit this.

[0122] The first group 11 may have positive power, and may include a first lens L1 and a second lens L2 arranged in sequence along the optical axis O. The first lens L1 may have positive power, and may include an object-side surface S1 and an image-side surface S2. The second lens L2 may have negative power, and may include an object-side surface S3 and an image-side surface S4.

[0123] The second group 12 may have negative refractive power, and may include a third lens L3 and a light folding element 121 sequentially arranged along the optical axis O. The third lens L3 may have negative refractive power, and may include an object-side surface S5 and an image-side surface S6.

[0124] In this embodiment, the first lens L1 is made of plastic material, the second lens L2 is made of plastic material, and the third lens L3 is made of plastic material. In other embodiments, the first lens L1, the second lens L2 and the third lens L3 can all be made of glass material, or include both glass material and plastic material, which is not limited in the present application.

[0125] The light folding element 121 may include an incident surface S7, a first reflection surface S8, a second reflection surface S9, a third reflection surface S10, a fourth reflection surface S11, and an exit surface S12. The incident surface S7 and the second reflection surface S9 may be coplanarly connected to form a surface, and the incident surface S7 and the second reflection surface S9 may at least partially overlap, so that light can be transmitted into the light folding element 121 from the overlapping area of ​​the incident surface S7 and the second reflection surface S9, and the light can also be reflected from the overlapping area of ​​the incident surface S7 and the second reflection surface S9. In other embodiments, the incident surface S7 and the second reflection surface S9 may not be coplanar, and the present application does not limit this. The third reflection surface S10 and the exit surface S12 may be coplanarly connected to form a surface, and the third reflection surface S10 and the exit surface S12 may at least partially overlap. In other embodiments, the third reflection surface S10 and the exit surface S12 may not be coplanar, and the present application does not limit this.

[0126] The light emitted through the first group 11 can be folded four times in the light folding element 121 before reaching the photosensitive element 20. After passing through the third lens L3, the light from the first group 11 can enter the light folding element 121 through the incident surface S7. At least a portion of the light passing through the incident surface S7 is reflected at the first reflection surface S8, and the light is reflected for the first time; at least a portion of the light reflected from the first reflection surface S8 is reflected at the second reflection surface S9, and the light is reflected for the second time; at least a portion of the light reflected from the second reflection surface S9 is reflected at the third reflection surface S10, and the light is reflected for the third time; at least a portion of the light reflected from the third reflection surface S10 is reflected at the fourth reflection surface S11, and the light is reflected for the fourth time, so that at least a portion of the light passes through the exit surface S12 and is emitted from the light folding element 121 to the photosensitive element 20.

[0127] In an embodiment of the present application, the light folding element 121 may include a parallelogram prism, and the first reflection surface S8 and the fourth reflection surface S11 are parallel. The angle between the incident surface S7 and the first reflection surface S8 may be 30°, and the angle between the exit surface S12 and the fourth reflection surface S11 may be 30°. In other embodiments, the angle between the incident surface S7 and the first reflection surface S8 or the angle between the exit surface S12 and the fourth reflection surface S11 may be an acute angle such as 20°, 25° or 45°, which is not limited in the present application.

[0128] The first reflective surface S8 and the fourth reflective surface S11 may include a reflective coating. Exemplarily, the reflective coating may include a mirror coating based on a thin metal layer or a film with a white inner surface, etc., for improving the ability of the first reflective surface S8 and the fourth reflective surface S11 to reflect light.

[0129] In addition, the filter 30 may include an object side surface S13 and an image side surface S14. Figure 6 and Figure 7 The image plane S15 is formed after the light sequentially passes through each lens group in the optical lens 10. The photosensitive element 20 is located at the imaging surface S15.

[0130] In this embodiment, the first group 11 and the photosensitive element 20 are located on different sides of the light folding element 121. When the camera module 100 switches from the telephoto state to the macro state, the first group 11 can move along the optical axis O toward the object side of the optical lens 10, and the second group 12 does not move, so as to increase the distance between the first group 11 and the second group 12 to achieve focusing.

[0131] See Table 2a, 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 second embodiment when the optical lens 10 is in the infinite working state. The Abbe number is also the dispersion coefficient. Wherein, OBJ represents the object plane of the optical lens 10.

[0132] Table 2a

[0133] Please refer to Table 2b, which shows the aspheric coefficients of each lens of the optical lens 10 of the second embodiment.

[0134] Table 2b

[0135] In this embodiment, the object side surface and the image side surface of each lens element of the first lens L1 to the third lens L3 are aspherical surfaces, which can be defined by but not limited to the following aspherical surface formula:

[0136] in z ( x , y ) is the optical surface sagittal height; k is the cone coefficient; c is the radius of curvature; r is the radius height in the direction of the optical axis; r 2 = x 2 + y 2 ; α i are the polynomial coefficients; r i is the normalized radial coordinate.

[0137] Please refer to Table 2c, which is Figure 6 The basic parameters of the optical lens 10 at infinity are shown as follows: 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.

[0138] Table 2c

[0139] See also Figure 8 , Figure 8 It is a representation diagram of the optical performance of the optical lens 10 in the second embodiment when the object distance is infinite.

[0140] in, Figure 8It includes an axial aberration curve diagram, an astigmatism field curvature diagram and a distortion diagram of the optical lens 10. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate at the pupil. Figure 8 The values ​​shown in the figure are all small, and the on-axis aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the abscissa is the deviation value along the optical axis, and the ordinate is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Figure 8 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Figure 8 All shown are within 1%, ensuring that there is no obvious distortion of the image.

[0141] See also Fig. 9 , Fig. 9 It is a representation diagram of the optical performance of the optical lens 10 in the second embodiment when the object distance is 100 mm.

[0142] in, Fig. 9 It includes an axial aberration curve diagram, an astigmatism field curvature diagram, and a distortion diagram of the optical lens 10 when the object distance is 100 mm. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the diagram), Fig. 9 The values ​​shown in the figure are all small, and the on-axis aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, and Y is the meridian direction light beam. When a field value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig. 9 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point of the beam in different fields of view (actual image height) and the ideal image height. Fig. 9 The distortion shown is within 1%, ensuring that there is no obvious deformation of the picture.

[0143] according to Figure 8 and Fig. 9It can be seen that the optical lens 10 provided in the second embodiment can achieve good imaging quality when the object distance is infinite and when the object distance is 100 mm at a macro distance.

[0144] In this embodiment, when the optical lens 10 switches from a long view to a close view, for example, switching to a macro distance of 100 mm, the spacing between the first group 11 and the second group 12 increases, the focus stroke is 1.18 mm, the focus stroke is short, the focus effect is good, and a good macro shooting effect can be achieved. In the embodiment of the present application, the EFL is 20 mm, the Fno is 2.6, and the FOV is 21°. The optical lens 10 of the present application has the characteristics of a telephoto and a large aperture.

[0145] Third embodiment: Please combine Fig.10 and Fig.11 , Fig.10 is a structural schematic diagram of the camera module 100 provided in the third embodiment of the present application in a working state, Fig.11 It is a structural diagram of the camera module 100 provided in the third embodiment of the present application in another working state. Fig.10 : is the long-range working state of the camera module 100 of the third embodiment of the present application when the object distance is infinite, Fig.11 The middle is the close-up working state of the camera module 100 of the third embodiment of the present application when shooting at a macro distance (100mm).

[0146] In the embodiment of the present application, the camera module 100 includes an optical lens 10, a filter 30 and a photosensitive element 20. Light passes through the optical lens 10 and the filter 30 in sequence and then forms an image on the photosensitive element 20. The optical lens 10 includes an aperture STO, a first group 11 and a second group 12 arranged in sequence along the optical axis O. The aperture STO can be located on the object side of the first lens L1. In other embodiments, the aperture STO can also be located on the image side or other positions of the first lens L1, and the present application does not limit this.

[0147] The first group 11 may have positive power, and may include a first lens L1 and a second lens L2 arranged in sequence along the optical axis O. The first lens L1 may have positive power, and may include an object-side surface S1 and an image-side surface S2. The second lens L2 may have negative power, and may include an object-side surface S3 and an image-side surface S4.

[0148] The second group 12 may have negative refractive power, and may include a third lens L3 and a light folding element 121 sequentially arranged along the optical axis O. The third lens L3 may have negative refractive power, and may include an object-side surface S5 and an image-side surface S6.

[0149] In this embodiment, the first lens L1 can be made of plastic, the second lens L2 can be made of plastic, and the third lens 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 both glass and plastic, which is not limited in this application.

[0150] The light folding element 121 may include an incident surface S7, a first reflection surface S8, a second reflection surface S9, a third reflection surface S10, a fourth reflection surface S11, a fifth reflection surface S12 and an exit surface S13. The incident surface S7, the second reflection surface S9, the fourth reflection surface S11 and the exit surface S13 may be coplanarly connected to form a surface, and any two adjacent surfaces among the four surfaces of the incident surface S7, the second reflection surface S9, the fourth reflection surface S11 and the exit surface S13 may at least partially overlap. Exemplarily, the incident surface S7 and the second reflection surface S9 may be coplanar, and the incident surface S7 and the second reflection surface S9 may partially overlap, so that the light can be transmitted into the light folding element 121 from the overlapping area of ​​the incident surface S7 and the second reflection surface S9, and the light can also be reflected in the overlapping area of ​​the incident surface S7 and the second reflection surface S9. In other embodiments, the incident surface S7, the second reflection surface S9, the fourth reflection surface S11 and the exit surface S13 may not be coplanar, and two adjacent surfaces among the incident surface S7, the second reflection surface S9 and the exit surface S13 may not overlap, which is not limited in the present application.

[0151] The light emitted through the first group 11 may be reflected and folded five times in the light folding element 121 before reaching the photosensitive element 20. After passing through the third lens L3, the light from the first group 11 may pass through the incident surface S7 and enter the light folding element 121. At least a portion of the light passing through the incident surface S7 is reflected at the first reflection surface S8, and the light is reflected for the first time; at least a portion of the light reflected from the first reflection surface S8 is reflected at the second reflection surface S9, and the light is reflected for the second time; at least a portion of the light reflected from the second reflection surface S9 is reflected at the third reflection surface S10, and the light is reflected for the third time; at least a portion of the light reflected from the third reflection surface S10 is reflected at the fourth reflection surface S11, and the light is reflected for the fourth time; at least a portion of the light reflected from the fourth reflection surface S11 is reflected at the fifth reflection surface S12, and the light is reflected for the fifth time, so that at least a portion of the light passes through the exit surface S13 and is emitted from the light folding element 121 to the photosensitive element 20.

[0152] In an embodiment of the present application, the light folding element 121 may include a trapezoidal cylindrical prism, illustratively, an isosceles trapezoidal cylindrical prism. The first reflection surface S8 and the fifth reflection surface S12 may be two waists of an isosceles trapezoid. The angle between the incident surface S7 and the first reflection surface S8 may be 30°, and the angle between the fifth reflection surface S12 and the exit surface S13 may be 30°. In other embodiments, the angle between the incident surface S7 and the first reflection surface S8 of the light folding element 121 or the angle between the fifth reflection surface S12 and the exit surface S13 may be 36° or 45°, etc., which is not limited in the present application.

[0153] The first reflective surface S8, the third reflective surface S10 and the fifth reflective surface S12 may include a reflective coating. Exemplarily, the reflective coating may include a mirror coating based on a thin metal layer or a film with a white inner surface, etc., for improving the ability of the first reflective surface S8, the third reflective surface S10 and the fifth reflective surface S12 to reflect light.

[0154] In addition, the filter 30 may include an object side surface S14 and an image side surface S15. Fig.10 and Fig.11 The image plane is the plane on which the image is formed after the light sequentially passes through each lens in the optical lens 10. The photosensitive element 20 is located at the image plane S16.

[0155] In this embodiment, the first group 11 and the photosensitive element 20 are located on the same side of the optical folding element 121. When the camera module 100 switches from the telephoto state to the macro state, the first group 11 can move along the optical axis O toward the object side of the optical lens 10, and the second group 12 does not move. Alternatively, the second group 12 can move along the optical axis O away from the object side of the optical lens 10, and the first group 11 does not move. Alternatively, the first group 11 can move along the optical axis O toward the object side of the optical lens 10, and the second group 12 can move along the optical axis O away from the object side of the optical lens 10, so as to increase the distance between the first group 11 and the second group 12 to achieve focusing. In the third embodiment, by Fig.10 The perspective state shown is Fig.11 In the close-up state shown, focusing is achieved by moving the first group 11 .

[0156] See Table 3a, 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 third embodiment when the optical lens 10 is in the infinite working state. The Abbe number is also the dispersion coefficient. Wherein, OBJ represents the object plane of the optical lens 10.

[0157] Table 3a

[0158] Please refer to Table 3b, which shows the aspheric coefficients of each lens of the optical lens 10 of the third embodiment.

[0159] Table 3b

[0160] Among them, symbols such as A4, A6, A8, A10, A12, A14 and A16 represent aspheric coefficients.

[0161] In this embodiment, the object-side surfaces and the image-side surfaces of the first lens L1 to the third lens L3 are all aspherical surfaces, which can be defined by but not limited to the following aspherical surface formula:

[0162] in z ( x , y ) is the optical surface sagittal height; k is the cone coefficient; c is the radius of curvature; r is the radius height in the direction of the optical axis; r 2 = x 2 + y 2 ; α i are the polynomial coefficients; r i are the normalized radial coordinates. A4, A6, A8, A10, A12, A14, and A16 are the aspheric coefficients.

[0163] Please refer to Table 3c, which is Fig.10 The basic parameters of the optical lens 10 at infinity are shown as follows: 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.

[0164] Table 3c

[0165] See also Fig.12 , Fig.12 It is a representation diagram of the optical performance of the optical lens 10 in the third embodiment when the object distance is infinite.

[0166] in, Fig.12It includes an axial aberration curve diagram, an astigmatism field curvature diagram and a distortion diagram of the optical lens 10. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate at the pupil. Fig.12 The values ​​shown in the figure are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig.12 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Fig.12 All shown are within 1%, ensuring that there is no obvious distortion of the image.

[0167] See also Fig.13 , Fig.13 It is a representation diagram of the optical performance of the optical lens 10 in the third embodiment when the object distance is 100 mm.

[0168] in, Fig.13 It includes an axial aberration curve diagram, an astigmatism field curvature diagram, and a distortion diagram of the optical lens 10 when the object distance is 100 mm. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the diagram), Fig.13 The values ​​shown in the middle are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, and Y is the meridian direction light beam. When a field value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig.13 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point of the beam in different fields of view (actual image height) and the ideal image height. Fig.13 The distortion shown is within 1%, ensuring that there is no obvious deformation of the picture.

[0169] according to Fig.12 and Fig.13It can be seen that the optical lens 10 provided in the third embodiment can achieve good imaging quality when the object distance is infinite and when the object distance is 100 mm at a macro distance.

[0170] In this embodiment, when the optical lens 10 switches from a distant view to a close view, for example, switching to a macro distance of 100 mm, the spacing between the first group 11 and the second group 12 increases, and the focus stroke of the first group 11 is 1.63 mm, the focus stroke is short, the focus effect is good, and a good macro shooting effect can be achieved. In the embodiment of the present application, the EFL is 26 mm, the Fno is 3.4, and the FOV is 17°. The optical lens 10 of the present application has the characteristics of a telephoto and a large aperture.

[0171] Fourth embodiment: Please combine Fig.14 and Fig.15 , Fig.14 is a structural schematic diagram of the camera module 100 provided in the fourth embodiment of the present application in a working state, Fig.15 It is a structural schematic diagram of the camera module 100 provided in the fourth embodiment of the present application in another working state. Fig.14 : is the long-range working state of the camera module 100 of the fourth embodiment of the present application when the object distance is infinite, Fig.15 The middle is the close-up working state of the camera module 100 of the fourth embodiment of the present application when shooting at a macro distance (100 mm).

[0172] The camera module 100 includes an optical lens 10, a filter 30 and a photosensitive element 20. In this embodiment, light passes through the optical lens 10 and the filter 30 in sequence to form an image on the photosensitive element 20. The optical lens 10 includes an aperture STO, a first group 11 and a second group 12 arranged in sequence along the optical axis O. The aperture STO can be located on the object side of the first lens L1. In other embodiments, the aperture STO can also be located on the image side or other positions of the first lens L1, and this application does not limit this.

[0173] The first group 11 may have positive power, and may include a first lens L1 and a second lens L2 arranged in sequence along the optical axis O. The first lens L1 may have positive power, and may include an object-side surface S1 and an image-side surface S2. The second lens may have negative power, and may include an object-side surface S3 and an image-side surface S4.

[0174] The second group 12 may have negative refractive power, and may include a third lens L3 and a light folding element 121 sequentially arranged along the optical axis O. The third lens L3 may have negative refractive power, and may include an object-side surface S5 and an image-side surface S6.

[0175] In this embodiment, the first lens L1 is made of plastic material, the second lens L2 is made of plastic material, and the third lens L3 is made of plastic material. In other embodiments, the first lens L1, the second lens L2 and the third lens L3 can all be made of glass material, or include both glass material and plastic material, which is not limited in the present application.

[0176] The light folding element 121 may include an incident surface S7, a first reflection surface S8, a second reflection surface S9, and an exit surface S10. The incident surface S7 and the second reflection surface S9 may be coplanarly connected to form a surface, and the incident surface S7 and the second reflection surface S9 may at least partially overlap. Optical light can be transmitted into the light folding element 121 from the overlapping area of ​​the incident surface S7 and the second reflection surface S9, and the light can also be reflected in the overlapping area of ​​the incident surface S7 and the second reflection surface S9. In other embodiments, the incident surface S7 and the second reflection surface S9 may not be coplanar, and the present application does not limit this.

[0177] The light emitted through the first group 11 may be reflected and folded twice in the light folding element 121 before reaching the photosensitive element 20. After passing through the third lens L3, the light from the first group 11 may pass through the incident surface S7 to enter the light folding element 121, and at least some of the light may reach the first reflection surface S8, and then be reflected at the first reflection surface S8, and the light is reflected for the first time; at least part of the light reflected from the first reflection surface S8 is reflected at the second reflection surface S9, and the light is reflected for the second time, so that at least part of the light passes through the exit surface S11 and is emitted from the light folding element 121 to the photosensitive element 20.

[0178] In the embodiment of the present application, the light folding element 121 may be a triangular prism or a quadrilateral prism. The angle between the incident surface S7 and the first reflection surface S8 may be 32°, and the second reflection surface S9. In other embodiments, the angle between the incident surface S7 and the first reflection surface S8 of the light folding element 121 may be 30° or 45°, etc., which is not limited in the present application.

[0179] The first reflective surface S8 may include a reflective coating. Exemplarily, 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 to reflect light.

[0180] In addition, the filter 30 may include an object side surface S11 and an image side surface S12. Fig.14 and Fig.15 ) is the image carrier surface formed after the light sequentially passes through each lens group in the optical lens 10. The photosensitive element 20 is located at the imaging surface S13.

[0181] In this embodiment, the first group 11 and the photosensitive element 20 can be located on different sides of the light folding element 121. When the camera module 100 switches from the telephoto state to the macro state, for example, switches to focus at a macro distance of 100 mm, the first group 11 can move toward the object side along the optical axis O to increase the distance between the first group 11 and the second group 12 to achieve focusing.

[0182] See Table 4a, which shows the curvature radius, thickness, refractive index, and Abbe number of each lens and filter 30 of the optical lens 10 in the fourth embodiment when the optical lens 10 is in the infinite working state. The Abbe number is also the dispersion coefficient. Wherein, OBJ represents the object plane of the optical lens 10.

[0183] Table 4a

[0184] Please refer to Table 4b, which shows the aspheric coefficients of each lens of the optical lens 10 of the fourth embodiment.

[0185] Table 4b

[0186] Among them, symbols such as A4, A6, A8, A10, A12, A14 and A16 represent aspheric coefficients.

[0187] In this embodiment, the object side surface and the image side surface of each lens element of the first lens L1 to the third lens L3 are aspherical surfaces, which can be defined by but not limited to the following aspherical surface formula:

[0188] in z ( x , y ) is the optical surface sagittal height; k is the cone coefficient; c is the radius of curvature; r is the radius height in the direction of the optical axis; r 2 = x 2 + y 2 ; α i are the polynomial coefficients; r i are the normalized radial coordinates. A4, A6, A8, A10, A12, A14, and A16 are the aspheric coefficients.

[0189] Please refer to Table 4c, which is Fig.14 The basic parameters of the optical lens 10 at infinity are shown as follows: 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.

[0190] Table 4c

[0191] See also Fig.16 , Fig.16 It is a representation diagram of the optical performance of the optical lens 10 in the fourth embodiment when the object distance is infinite.

[0192] in, Fig.16 It includes an axial aberration curve diagram, an astigmatism field curvature diagram and a distortion diagram of the optical lens 10. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate at the pupil. Fig.16 The values ​​shown in the figure are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig.16 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Fig.16 All shown are within 1%, ensuring that there is no obvious distortion of the image.

[0193] See also Fig.17 , Fig.17 It is a representation diagram of the optical performance of the optical lens 10 in the fourth embodiment when the object distance is 100 mm.

[0194] in, Fig.17 It includes an axial aberration curve diagram, an astigmatism field curvature diagram, and a distortion diagram of the optical lens 10 when the object distance is 100 mm. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the diagram), Fig.17 The values ​​shown in the middle are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, and Y is the meridian direction light beam. When a field value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig.17The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point of the beam in different fields of view (actual image height) and the ideal image height. Fig.17 The distortion shown is within 1%, ensuring that there is no obvious deformation of the picture.

[0195] according to Fig.16 and Fig.17 It can be seen that the optical lens 10 provided in the fourth embodiment can achieve good imaging quality when the object distance is infinite and when the object distance is 100 mm at a macro distance.

[0196] The spacing between the first group 11 and the second group 12 is increased, and the focus stroke of the first group 11 is 1.35mm, the focus stroke is short, the focus effect is good, and a good macro shooting effect can be achieved. In the embodiment of the present application, the EFL is 11.5mm, the Fno is 2.2, and the FOV is 36°. The optical lens 10 of the present application has the characteristics of telephoto and large aperture.

[0197] Fifth embodiment: Please combine Fig.18 and Fig.19 , Fig.18 is a structural schematic diagram of the camera module 100 provided in the fifth embodiment of the present application in a working state, Fig.19 It is a structural diagram of the camera module 100 provided in the fifth embodiment of the present application in another working state. Fig.18 : is the perspective working state of the camera module 100 of the fifth embodiment of the present application when the object distance is infinite, Fig.19 The middle shows the close-up working state of the camera module 100 of the fifth embodiment of the present application when shooting at a macro distance (68 mm).

[0198] In the embodiment of the present application, the camera module 100 includes an optical lens 10, a filter 30 and a photosensitive element 20. Light passes through the optical lens 10 and the filter 30 in sequence and then forms an image on the photosensitive element 20. The optical lens 10 includes an aperture STO, a first group 11 and a second group 12 arranged in sequence along the optical axis O. The aperture STO can be located on the object side of the first lens L1. In other embodiments, the aperture STO can also be located on the image side or other positions of the first lens L1, and the present application does not limit this.

[0199] The first group 11 may have positive power, and may include a first lens L1 and a second lens L2 arranged in sequence along the optical axis O. The first lens L1 may have positive power, and include an object-side surface S1 and an image-side surface S2. The second lens may have negative power, and include an object-side surface S3 and an image-side surface S4.

[0200] The second group 12 may have negative refractive power, and include a third lens L3 and a light folding element 121 sequentially arranged along the optical axis O. The third lens L3 may have negative refractive power, and may include an object-side surface S5 and an image-side surface S6.

[0201] In this embodiment, the first lens L1 is made of plastic material, the second lens L2 is made of plastic material, and the third lens is made of plastic material. In other embodiments, the first lens L1, the second lens L2, and the third lens L3 may all be made of glass material, or include both glass material and plastic material, which is not limited in the present application.

[0202] The light folding element 121 may include an incident surface S7, a first reflection surface S8, a first surface S9, a second surface S10, a second reflection surface S11 and an exit surface S12. The incident surface S7 and the exit surface S12 may be coplanar. In other embodiments, the incident surface S7 and the exit surface S12 may not be coplanar, which is not limited in the present application. The light emitted from the first group 11 may be reflected and folded twice in the light folding element 121 before reaching the photosensitive element 20. After passing through the third lens L3, the light from the first group 11 may pass through the incident surface S7 and enter the light folding element 121. At least a portion of the light may reach the first reflection surface S8, and then be reflected at the first reflection surface S8, and the light is reflected for the first time; at least some of the light reflected from the first reflection surface S8 may pass through the first surface S9; at least a portion of the light passing through the first surface S9 may reach the second surface S10 and pass through the second surface S10; at least a portion of the light passing through the second surface S10 may reach the second reflection surface S11 and be reflected at the second reflection surface S11, and the light is reflected for the second time. At least a portion of the light reflected from the second reflection surface S11 may reach the exit surface S12, and pass through the exit surface S12 to exit the light folding element 121 and be incident on the photosensitive element 20 to form an image.

[0203] In the embodiment of the present application, the light folding element 121 may be an isosceles trapezoidal prism. It can be understood that, from the perspective of 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 reflection surface S8 and the second reflection surface S11 may be the two waists of the isosceles trapezoid, the angle between the incident surface S7 and the first reflection surface S8 may be 45°, and the angle between the second reflection surface S11 and the exit surface S12 may be 45°. In other implementations, the angle between the incident surface S7 and the first reflection surface S8 or the angle between the second reflection surface S11 and the exit surface S12 may also be 30° or 40°, etc.

[0204] The first reflective surface S8 and the second reflective surface S11 may include a reflective coating. Exemplarily, the reflective coating may include a mirror coating based on a thin metal layer or a film with a white inner surface, etc., for improving the ability of the first reflective surface S8 and the second reflective surface S11 to reflect light.

[0205] In addition, the filter 30 includes an object side surface S13 and an image side surface S14. Fig.18 and Fig.19 The imaging surface S15 is the surface on which the image is formed after the light sequentially passes through each lens in the optical lens 10. The photosensitive element 20 is located at the imaging surface S15.

[0206] In this embodiment, the first group 11 and the photosensitive element 20 are located on the same side of the optical folding element 121. When the camera module 100 switches from the telephoto state to the macro state, the first group 11 can move along the optical axis O toward the object side of the optical lens 10, and the second group 12 does not move, or the second group 12 can move along the optical axis O away from the object side of the optical lens 10, and the first group 11 does not move, or the first group 11 can move along the optical axis O toward the object side of the optical lens 10, and the second group 12 can move along the optical axis O away from the object side of the optical lens 10, thereby increasing the distance between the first group 11 and the second group 12 to achieve focusing. In the fifth embodiment, by Fig.18 The perspective state shown is Fig.19 In the close-up state shown, focusing can be achieved by moving the first group 11 .

[0207] See Table 5a, 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 fifth embodiment when the optical lens 10 is in the infinite working state. The Abbe number is also the dispersion coefficient. Wherein, OBJ represents the object plane of the optical lens 10.

[0208] Table 5a

[0209] Please refer to Table 5b, which shows the aspheric coefficients of each lens of the optical lens 10 of the fifth embodiment.

[0210] Table 5b

[0211] Among them, symbols such as A4, A6, A8, A10, A12, A14 and A16 represent aspheric coefficients.

[0212] In this embodiment, the object side surface and the image side surface of each lens element of the first lens L1, the second lens L2 and the third lens L3 are all aspherical surfaces, which can be defined by but not limited to the following aspherical surface formula:

[0213] in z ( x , y ) is the optical surface sagittal height; k is the cone coefficient; c is the radius of curvature; r is the radius height in the direction of the optical axis; r 2 = x 2 + y 2 ; α i are the polynomial coefficients; r i are the normalized radial coordinates. A4, A6, A8, A10, A12, A14, and A16 are the aspheric coefficients.

[0214] Please refer to Table 5c, which is Fig.18 The basic parameters of the optical lens 10 at infinity are shown in Table 5c. In Table 5c, 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.

[0215] Table 5c

[0216] See also Fig. 20 , Fig. 20 It is a representation diagram of the optical performance of the optical lens 10 in the fifth embodiment when the object distance is infinite.

[0217] in, Fig. 20 It includes an axial aberration curve diagram, an astigmatism field curvature diagram and a distortion diagram of the optical lens 10. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate at the pupil. Fig. 20 The values ​​shown in the figure are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig. 20The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Fig. 20 All shown are within 1%, ensuring that there is no obvious distortion of the image.

[0218] See also Fig.21 , Fig.21 It is a representation diagram of the optical performance of the optical lens 10 in the fifth embodiment when the object distance is 68 mm.

[0219] in, Fig.21 It includes an axial aberration curve diagram, an astigmatism field curvature diagram, and a distortion diagram of the optical lens 10 when the object distance is 68 mm. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the diagram), Fig.21 The values ​​shown in the middle are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, and Y is the meridian direction light beam. When a field value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig.21 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point of the beam in different fields of view (actual image height) and the ideal image height. Fig.21 The distortion shown is within 1%, ensuring that there is no obvious deformation of the picture.

[0220] according to Fig. 20 and Fig.21 It can be seen that the optical lens 10 provided in the fifth embodiment can achieve good imaging quality when the object distance is infinity and when the object distance is a macro distance of 68 mm.

[0221] In this embodiment, when the optical lens 10 switches from a distant view to a close view, for example, switching to focus at a macro distance of 68 mm, the spacing between the first group 11 and the second group 12 increases, and the focus stroke of the first group 11 is 1.07 mm, the focus stroke is short, the focus effect is good, and a good macro shooting effect can be achieved. In the embodiment of the present application, the EFL is 17.2 mm, the Fno is 2.2, and the FOV is 24.4°. The optical lens 10 of the present application has the characteristics of a telephoto and a large aperture.

[0222] Sixth embodiment: Please combine Fig. 22 and Fig.23 , Fig. 22 is a structural schematic diagram of the camera module 100 provided in the sixth embodiment of the present application in a working state, Fig.23It is a structural diagram of the camera module 100 provided in the sixth embodiment of the present application in another working state. Fig. 22 : is the long-range working state of the camera module 100 of the sixth embodiment of the present application when the object distance is infinite, Fig.23 The middle is the close-up working state of the camera module 100 of the sixth embodiment of the present application when shooting at a macro distance (68mm).

[0223] In the embodiment of the present application, the camera module 100 includes an optical lens 10, a filter 30 and a photosensitive element 20. Light passes through the optical lens 10 and the filter 30 in sequence and then forms an image on the photosensitive element 20. The optical lens 10 includes an aperture STO, a first group 11 and a second group 12 arranged in sequence from the object side to the image side along the optical axis O. The aperture STO can be located on the object side of the first lens L1. In other embodiments, the aperture STO can also be located on the image side or other positions of the first lens L1, and the present application does not limit this.

[0224] The first group 11 may have positive power, and may include a first lens L1 and a second lens L2 arranged in sequence along the optical axis O. The first lens L1 may have positive power, and may include an object-side surface S1 and an image-side surface S2. The second lens may have negative power, and may include an object-side surface S3 and an image-side surface S4.

[0225] The second group 12 may have negative refractive power, and may include a third lens L3 and a light folding element 121 sequentially arranged along the optical axis O. The third lens L3 may have negative refractive power, and may include an object-side surface S5 and an image-side surface S6.

[0226] In this embodiment, the first lens L1 is made of plastic material, the second lens L2 is made of plastic material, and the third lens is made of plastic material. In other embodiments, the first lens L1, the second lens L2, and the third lens L3 may all be made of glass material, or include both glass material and plastic material, which is not limited in the present application.

[0227] The light folding element 121 may include an incident surface S7, a first reflection surface S8, a first surface S9, a second surface S10, a second reflection surface S11, and an exit surface S12. The light emitted through the first group 11 may be reflected and folded twice in the light folding element 121 before reaching the photosensitive element 20. The light from the first group 11 may enter the light folding element 121 through the incident surface S7 after passing through the third lens L3. At least a portion of the light may reach the first reflection surface S8, and then be reflected at the first reflection surface S8, and the light is reflected for the first time. At least some of the light reflected from the first reflection surface S8 may pass through the first surface S9. At least a portion of the light passing through the first surface S9 may reach the second surface S10 and pass through the second surface S10, and at least a portion of the light passing through the second surface S10 may reach the second reflection surface S11 and be reflected at the second reflection surface S11, and the light is reflected for the second time. At least a portion of the light reflected from the second reflection surface S11 can reach the exit surface S12, pass through the exit surface S12, exit the light folding element 121, and be incident on the photosensitive element 20 to form an image.

[0228] In the embodiment of the present application, the light folding element 121 may be a parallelogram prism, the incident surface S7 is parallel to the exit surface S12, the first reflection surface S8 and the second reflection surface S11 may be parallel, the angle between the incident surface S7 and the first reflection surface S8 may be 45°, and the angle between the second reflection surface S11 and the exit surface S12 may be 45°. In other implementations, the angle between the incident surface S7 and the first reflection surface S8 or the angle between the second reflection surface S11 and the exit surface S12 may also be 30° or 40°, etc.

[0229] The first reflective surface S8 and the second reflective surface S11 may include a reflective coating. Exemplarily, the reflective coating may include a mirror coating based on a thin metal layer or a film with a white inner surface, etc., for improving the ability of the first reflective surface S8 and the second reflective surface S11 to reflect light.

[0230] In addition, the filter 30 may include an object side surface S13 and an image side surface S14. Fig. 22 and Fig.23 The imaging surface S15 is the surface on which the image is formed after the light sequentially passes through each lens in the optical lens 10. The photosensitive element 20 is located at the imaging surface S15.

[0231] In this embodiment, the first group 11 and the photosensitive element 20 are located on different sides of the light folding element 121. When the camera module 100 switches from the telephoto state to the macro state, the first group 11 can move along the optical axis O toward the object side of the optical lens 10, and the second group 12 does not move, thereby increasing the distance between the first group 11 and the second group 12 to achieve focusing.

[0232] See Table 6a, which shows the curvature radius, thickness, refractive index, and Abbe number of each lens and filter 30 of the optical lens 10 in the sixth embodiment when the optical lens 10 is in the infinite working state. The Abbe number is also the dispersion coefficient. Wherein, OBJ represents the object plane of the optical lens 10.

[0233] Table 6a

[0234] Please refer to Table 6b, which shows the aspheric coefficients of each lens of the optical lens 10 of the sixth embodiment.

[0235] Table 6b

[0236] Among them, symbols such as A4, A6, A8, A10, A12, A14 and A16 represent aspheric coefficients.

[0237] In this embodiment, the object side surface and the image side surface of each lens element of the first lens L1, the second lens L2 and the third lens L3 are all aspherical surfaces, which can be defined by but not limited to the following aspherical surface formula:

[0238] in z ( x , y ) is the optical surface sagittal height; k is the cone coefficient; c is the radius of curvature; r is the radius height in the direction of the optical axis; r 2 = x 2 + y 2 ; α i are the polynomial coefficients; r i are the normalized radial coordinates. A4, A6, A8, A10, A12, A14, and A16 are the aspheric coefficients.

[0239] Please refer to Table 6c, which is Fig. 22 The basic parameters of the optical lens 10 at infinity are shown in Table 6c. In Table 6c, 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.

[0240] Table 6c

[0241] See also Fig.24 , Fig.24It is a representation diagram of the optical performance of the optical lens 10 in the sixth embodiment when the object distance is infinite.

[0242] in, Fig.24 It includes an axial aberration curve diagram, an astigmatism field curvature diagram and a distortion diagram of the optical lens 10. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate at the pupil. Fig.24 The values ​​shown in the figure are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig.24 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Fig.24 All shown are within 1%, ensuring that there is no obvious distortion of the image.

[0243] See also Fig.25 , Fig.25 It is a representation diagram of the optical performance of the optical lens 10 in the sixth embodiment when the object distance is 68 mm.

[0244] in, Fig.25 It includes an axial aberration curve diagram, an astigmatism field curvature diagram, and a distortion diagram of the optical lens 10 when the object distance is 68 mm. The axial aberration curve diagram includes aberration curves corresponding to different bands of the system (including 650.0000nm, 610.0000nm, 587.5618nm, 555.0000nm, and 470.0000nm in the diagram), Fig.25 The values ​​shown in the middle are all small, and the axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, and Y is the meridian direction light beam. When a field value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig.25 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point of the beam in different fields of view (actual image height) and the ideal image height. Fig.25 The distortion shown is within 1%, ensuring that there is no obvious deformation of the picture.

[0245] according to Fig.24 and Fig.25 It can be seen that the optical lens 10 provided in the sixth embodiment can achieve good imaging quality when the object distance is infinite and when the object distance is 68 mm at a macro distance.

[0246] In this embodiment, when the optical lens 10 switches from a distant view to a close view, for example, switching to focus at a macro distance of 68 mm, the spacing between the first group 11 and the second group 12 increases, and the focus stroke of the first group 11 is 1.07 mm, the focus stroke is short, the focus effect is good, and a good macro shooting effect can be achieved. In the embodiment of the present application, the EFL is 17.2 mm, the Fno is 2.2, and the FOV is 24.4°. The optical lens 10 of the present application has the characteristics of a telephoto and a large aperture.

[0247] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

Claims

1. An optical lens (10), characterized in that: It comprises a first group (11) and a second group (12), wherein the optical power of the first group (11) is opposite to the optical power of the second group (12); The first group (11) includes at least two lenses; The second group (12) includes at least one lens with negative optical power and a light folding element (121), the lens of the second group (12) is located between the first group (11) and the light folding element (121), and the light emitted from the first group (11) passes through the lens of the second group (12) and the light folding element (121) in sequence, and the light is reflected multiple times in the light folding element (121); The first group (11) and / or the second group (12) are focusing lens groups, and during the focusing process of the optical lens (10) from a distant view to a near view, the distance between the first group (11) and the second group (12) increases; the optical lens (10) satisfies the following relationship: FOV<50°, FOV is the field of view angle of the optical lens (10) when the object distance is infinite.

2. The optical lens (10) according to claim 1, characterized in that: The first group (11) has positive optical power, and the second group (12) has negative optical power.

3. The optical lens (10) according to claim 1 or 2, characterized in that: 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 in sequence. The first lens (L1) has a positive optical power, the second lens (L2) has a negative optical power, and the third lens (L3) has a negative optical power.

4. The optical lens (10) according to claim 1 or 2, characterized in that: The focal length F1 of the first group (11) of the optical lens (10) and the effective focal length EFL of the optical lens (10) satisfy the following relationship: F1 / EFL≤0.

9.

5. The optical lens (10) according to claim 1 or 2, characterized in that: The focal length F2 of the second group (12) of the optical lens (10) and the effective focal length EFL of the optical lens (10) satisfy the following relationship: F2 / EFL>-1.

6. The optical lens (10) according to claim 1 or 2, characterized in that: The first group (11) comprises at least one lens with positive optical power, and the ratio of the effective 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.

7. The optical lens (10) according to claim 1 or 2, characterized in that: The optical lens (10) satisfies the following relationship: ImgH>2mm, ImgH is the maximum image height of the optical lens (10).

8. The optical lens (10) according to claim 1 or 2, characterized in that: The first group (11) includes at least one lens with an Abbe number less than 40.

9. The optical lens (10) according to claim 1 or 2, characterized in that: The optical lens (10) satisfies the following relationship: Fno<3.6, Fno is the aperture number of the optical lens (10).

10. The optical lens (10) according to claim 1 or 2, characterized in that: The first group (11) comprises lenses with positive optical power, and the material of the lens with positive optical power and the smallest focal length in the first group (11) is glass.

11. The optical lens (10) according to claim 1 or 2, characterized in that: The Abbe number of the lenses in the second group (12) is different from the Abbe number of the light folding element (121).

12. The optical lens (10) according to claim 1 or 2, characterized in that: The optical path length of light passing through the optical axis of the first group (11) in the light folding element (121) is greater than twice the maximum image height.

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

14. An electronic device (1000), characterized in that: It comprises an image processor (200) and the camera module (100) according to claim 13, wherein the image processor (200) is communicatively connected to the camera module (100), and the image processor (200) is used to obtain image data from the camera module (100) and process the image data.

Images