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 lens group and a second lens group which are arranged from an object side to an image side, the first lens group has positive focal power, the second lens group has negative focal power, and the first lens group and / or the second lens group are / is a focusing lens group. In the focusing process of switching the optical lens from the long shot to the close shot, the distance between the first lens group and the second lens group is increased, and the effective focal length of the optical lens is reduced. The optical lens meets the relational expression that F2 / EFL is larger than-5, F2 is the focal length of the second lens group, and EFL is the effective focal length of the optical lens. The optical lens provided by the invention has the characteristics of long focus, micro distance and large clear aperture, and can realize miniaturization.

Description

[0001] This application is a divisional application of the original application with the application number 202380028485.2 and the original filing date of March 21, 2023, and the entire contents of the original application are incorporated herein by reference.

[0002] This application claims priority to the Chinese patent application No. 202210288243.4 filed on March 23, 2022, entitled “Optical lens, camera module and electronic device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of shooting devices, in particular to an optical lens, a camera module and an electronic device. BACKGROUND

[0004] Portable electronic products are applied more and more widely, and the camera module is a typical electronic device component. In the combined optical lens of multi-camera, the long-focus lens design is indispensable. The long-focus lens has become the development trend of the camera module of electronic products.

[0005] In order to improve the shooting experience, it is usually desired that the optical lens has a larger photosensitive element, a smaller F number (a larger light aperture), and a closer long-focus macro. However, in the earlier upright design, as the focal length increases, the size of the optical lens increases sharply, but the size of the portable terminal device is limited, and it is difficult to realize macro shooting.

[0006] Therefore, it is necessary to provide an optical lens with long-focus, macro, large light aperture and miniaturization. SUMMARY

[0007] The present application provides an optical lens, a camera module and an electronic device, which has the characteristics of long-focus, macro and large light aperture, and can realize miniaturization.

[0008] In a first aspect, the present application provides an optical lens, comprising a first lens group and a second lens group arranged from an object side to an image side, the first lens group having positive refractive power, the second lens group having negative refractive power, the first lens group and / or the second lens group being a focusing lens group; during a focusing process of the optical lens from a telephoto to a close-up, a distance between the first lens group and the second lens group increases, and an effective focal length of the optical lens decreases; the optical lens satisfies the following relationship: F2 / EFL > -5, F2 being a focal length of the second lens group, and EFL being the effective focal length of the optical lens. During focusing, only the first lens group can move along an optical axis for focusing, only the second lens group can move along the optical axis for focusing, or both the first lens group and the second lens group can move along the optical axis for focusing. It should be noted that when the object distance is infinity, the optical lens of the present application is a fixed-focus lens, and when the object distance is switched from infinity to micro distance, the focal length of the optical lens decreases.

[0009] The present application limits the refractive power of the first lens group and the second lens group and limits F2 / EFL > -5, so that the optical lens has the characteristics of long focal length, micro distance and large aperture, and can be miniaturized. Specifically, the first lens group has positive refractive power, and the first lens group is used for beam convergence, so that the diameter of the light beam entering the second lens group is small, the aperture of the second lens group is no longer the maximum limit of the light aperture, which is beneficial to the miniaturization and large aperture design of the optical lens, effectively increases the light aperture, and realizes a small aperture number. The second lens group has negative refractive power, which is beneficial to realize long focal length design and is used for focusing and micro distance focusing, has small focusing stroke and strong focusing ability. By limiting F2 / EFL > -5, the second lens group can have sufficient refractive power, the focusing stroke can be reduced, the focusing ability is strong, and the image quality is high when shooting objects at different distances. The optical lens of the present application not only can shoot at long distance, but also can shoot at close distance, and the optical lens of the present application has good shooting effect on objects with an object distance of between infinity and 20 mm. When the optical lens of the present application shoots objects with an object distance of between 20 mm and 50 mm, the focusing stroke is small and the imaging quality is high.

[0010] In a possible implementation, during the focusing process of the optical lens from the telephoto to the close-up, the first lens group moves along the optical axis to the object side and / or the second lens group moves along the optical axis to the image side. During the focusing process of the optical lens from the telephoto to the close-up, the second lens group can move to the image side, or the first lens group moves to the object side, or the first lens group moves to the object side and the second lens group can move to the image side, so as to increase the distance between the first lens group and the second lens group, reduce the effective focal length of the optical lens, and realize micro distance shooting.

[0011] In a possible implementation, the optical lens satisfies the following relationship: 0.5≤TTL / EFL≤5, TTL is the distance from the object side surface of the first lens of the first lens group to the imaging surface on the optical axis in the working state. The first lens is the lens closest to the object side in the first lens group. By limiting the range of TTL / EFL, the miniaturization of the optical lens is facilitated.

[0012] In a possible implementation, the optical lens satisfies the following relationship: F1 / EFL≤5, F1 is the focal length of the first lens group. By limiting the suitable range of F1 / EFL, the power of the first lens group can be reasonably configured, the aperture number is reduced, the design of a large aperture is facilitated, the clear aperture is increased, and good imaging quality can be ensured.

[0013] In a possible implementation, the first lens group includes at least two lenses, and the Abbe numbers of the at least two lenses are different. The chromatic aberration is corrected by lenses with different Abbe numbers, and therefore, by setting the Abbe numbers of the different lenses in the first lens group to be different, the influence of the chromatic aberration on the image quality is reduced.

[0014] In a possible implementation, the first lens group includes a first lens, a second lens, and a third lens arranged from the object side to the image side, the first lens has positive power, the second lens has negative power, and the third lens has positive power. In this embodiment, by reasonably configuring the powers of the first lens, the second lens, and the third lens, the design of a large aperture is facilitated, the clear aperture is increased, and good imaging quality can be ensured.

[0015] In a possible implementation, the first lens group includes a first lens, and the optical lens satisfies the following relationship: Vd1≥18, Vd1 is the Abbe number of the first lens. Exemplarily, the Abbe number of the first lens can be 40 or 50, or the like. By limiting the Abbe number of the first lens to be greater than 18, it is ensured that the first lens group has a relatively large Abbe number, and at this time, the first lens group can ensure that the optical lens does not have excessive residual chromatic aberration, and the design difficulty of the lens group located on the image side of the first lens group is reduced.

[0016] In a possible implementation, at least one lens in the first lens group is made of glass. The lens made of glass is beneficial to improving the imaging quality, reducing the chromatic aberration and temperature drift effect of the optical lens, and avoiding the influence of temperature change on the focal length of the optical lens. It can be understood that the lenses in the first lens group and the second lens group can all be made of glass, or all be made of plastic, or both glass lenses and plastic lenses are included. The lens made of glass is beneficial to improving the imaging quality, reducing the chromatic aberration and temperature drift effect, and the lens made of plastic can reduce the weight and cost of the optical lens.

[0017] In a possible implementation, the first lens group comprises a first lens, and a region close to the optical axis on the object side of the first lens is convex, which is conducive to converging the light beam. The region close to the optical axis on the object side of the first lens refers to a region of 1 / 50 of the aperture height of the object side of the first lens.

[0018] In a possible implementation, the optical lens satisfies the following relationship: 1mm≤φ1≤30mm, where φ1 is the maximum effective diameter of the first lens group. The larger the maximum effective diameter of the first lens group, the larger the target surface size of the optical lens, so that the optical lens has a large target surface feature, which is conducive to increasing the definition of imaging and improving the imaging quality.

[0019] In a possible implementation, the optical lens satisfies the following relationship: 1mm≤φ2≤30mm, where φ2 is the maximum effective diameter of the second lens group. The larger the maximum effective diameter of the second lens group, the larger the target surface size of the optical lens, so that the optical lens has a large target surface feature, which is conducive to increasing the definition of imaging and improving the imaging quality.

[0020] In a possible implementation, the optical lens satisfies the following relationship: 0.3mm≤h1≤50mm, where h1 is the maximum pop-up height of the first lens group. The maximum pop-up height of the first lens group refers to the maximum distance of movement of the first lens group when the optical lens is switched from an inoperative state to an operative state. In the embodiment of the application, the maximum pop-up height of the first lens group is small, that is, the displacement of the first lens group is small, so that the power requirement of the motor is small, the volume of the motor for driving the movement of the first lens group is reduced, and the camera module is more easily miniaturized.

[0021] In a possible implementation, the optical lens satisfies the following relationship: 0.3mm≤h2≤50mm, where h2 is the maximum pop-up height of the second lens group. The maximum pop-up height of the second lens group refers to the maximum distance of movement of the second lens group when the optical lens is switched from an inoperative state to an operative state. In the embodiment of the application, the maximum pop-up height of the second lens group is small, that is, the displacement of the second lens group is small, so that the power requirement of the motor is small, the volume of the motor for driving the movement of the second lens group is reduced, and the camera module is more easily miniaturized.

[0022] In a possible implementation, the optical lens comprises a variable aperture, and the size of the variable aperture decreases in the focusing process of switching the optical lens from a long shot to a close shot. When a long shot is taken, the size of the aperture can be increased by adjusting the variable aperture, the depth of field is shallow, and the blurring effect is good, which is conducive to long shot. When a macro shot is taken, the blurring effect is not suitable for improving the clarity of shooting, and therefore the variable aperture needs to be adjusted to be small to improve the quality of the macro shot.

[0023] In a possible implementation, the optical lens satisfies the following relationship: 0.5≤Fno≤8, where Fno is the F-number of the optical lens. A smaller Fno means a larger aperture, and a larger Fno means a smaller aperture. When shooting a long shot, the Fno can be reduced by adjusting the variable aperture to obtain a large aperture, which is beneficial to shooting a long shot. When shooting a macro shot, the Fno is increased to reduce the aperture, thereby improving the quality of the macro shot.

[0024] In a possible implementation, the optical lens comprises a third lens group located on the image side of the second lens group, and the third lens group has optical power. The third lens group can have positive optical power or negative optical power. During focusing, the position of the third lens group can be unchanged, or the third lens group can also move. The third lens group is used to correct field curvature and improve the imaging quality of the optical lens. For example, the third lens group can have negative optical power, in which case the third lens group functions as a flat-field lens and can compensate for part of the field curvature change caused by focusing, thereby greatly enhancing the focusing ability of the second lens group, making the optical lens have strong focusing ability, and making the image quality uniform when the object distance changes from infinity to a finite distance, and the imaging quality of the camera module is higher. In other implementations, the third lens group has positive optical power to match the special structural requirements of the different moving directions of the second lens group during automatic focusing.

[0025] In a possible implementation, the optical lens satisfies the following relationship: 5mm≤ox1+ox2+ox3≤30mm, where ox1 is the thickness of the first lens group on the optical axis, ox2 is the thickness of the second lens group on the optical axis, and ox3 is the thickness of the third lens group on the optical axis. The optical lens provided in the present application can be used in a pop-up camera module or a periscope camera module. Taking the pop-up camera module as an example, the present application limits ox1+ox2+ox3≤30mm to ensure that the optical lens has a small size when it is stored, thereby avoiding the optical lens part being protruding, affecting the weight and appearance. By limiting ox1+ox2+ox3≥5mm, the optical lens has the feature of a large target surface, which is beneficial to increasing the clarity of the image and improving the imaging quality.

[0026] In a possible implementation, the optical surface of at least one lens in the third lens group is aspherical. In this way, the optical power is different from the paraxial region to the outer field region, so that the imaging image has more balanced image quality, corrects aberration, and improves the imaging quality.

[0027] In a possible implementation, the optical lens includes a liquid lens and / or a liquid crystal lens, and the liquid lens and / or the liquid crystal lens is located in the first lens group. In this implementation, the focusing effect can be enhanced by the liquid lens or the liquid crystal lens to achieve super-macro shooting. The liquid lens is a structure that uses liquid as a lens and changes the focal length by changing the curvature of the liquid. In other implementations, the liquid lens or the liquid crystal lens can also be located in the second lens group G2.

[0028] In a possible implementation, the optical lens includes a diffractive element, and the diffractive element is located in the first lens group. In this implementation, the diffractive element is used to reduce chromatic aberration, reduce the volume of the optical lens, improve the imaging quality of the optical lens, and realize miniaturization of the optical lens.

[0029] In a possible implementation, the optical lens satisfies the following relationship: 2mm≤ImgH≤10mm, where ImgH is the maximum image height of the optical lens, and the diagonal size of the photosensitive element is twice the maximum image height of the optical lens. The range of ImgH is limited to make the optical lens have the characteristic of a large target surface.

[0030] In a possible implementation, the optical lens satisfies the following relationship: FOV≤140°, where FOV is the full field of view of the optical lens.

[0031] In a possible implementation, the object distance range of the optical lens is from infinity to 20mm, and the optical lens can clearly image within the object distance range from infinity to 20mm.

[0032] In a possible implementation, the focusing stroke of the second lens group is less than or equal to 50mm.

[0033] In a possible implementation, the focusing stroke of the second lens group is less than or equal to 50mm.

[0034] In a possible implementation, the focusing stroke of the second lens group is less than or equal to 50mm. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a schematic diagram of an electronic device provided by an embodiment of the present application; Figure 2 FIG. 2 is a structural schematic diagram of a camera module of a first embodiment of the present application; Figure 3is Figure 2 a structural schematic diagram of the camera module in another working state; Figure 4 is Figure 2 a structural schematic diagram of the camera module in another working state; Figure 5 is a simplified structural schematic diagram of the optical lens in different states according to an embodiment of the present application; Figure 6 is a representation diagram of optical performance of the optical lens in the first embodiment when the object distance is infinite; Figure 7 is a representation diagram of optical performance of the optical lens in the first embodiment when the object distance is 50mm; Figure 8 is a structural schematic diagram of the camera module of the second embodiment of the present application; Figure 9 is Figure 8 a structural schematic diagram of the camera module in another working state; Figure 10 is Figure 8 a structural schematic diagram of the camera module in another working state; Figure 11 is a representation diagram of optical performance of the optical lens in the second embodiment when the object distance is infinite; Figure 12 is a representation diagram of optical performance of the optical lens in the second embodiment when the object distance is 50mm; Figure 13 is a structural schematic diagram of the camera module of the third embodiment of the present application; Figure 14 is Figure 13 a structural schematic diagram of the camera module in another working state; Figure 15 is Figure 13 a structural schematic diagram of the camera module in another working state; Figure 16 is a representation diagram of optical performance of the optical lens in the third embodiment when the object distance is infinite; Figure 17 is a representation diagram of optical performance of the optical lens in the third embodiment when the object distance is 50mm; Figure 18 is a structural schematic diagram of the camera module of the fourth embodiment of the present application; Figure 19 is Figure 18 a structural schematic diagram of the camera module in another working state; Figure 20 is Figure 18Structure diagram of the camera module in another working state is shown; Figure 21 is a representation of the optical performance of the optical lens in the fourth embodiment when the object distance is infinite; Figure 22 is a representation of the optical performance of the optical lens in the fourth embodiment when the object distance is 50mm. DETAILED DESCRIPTION

[0036] For the convenience of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0037] Focal power, equal to the difference between the convergence degree of the image-side beam and the convergence degree of the object-side beam, which represents the ability of the optical system to deflect light.

[0038] Lens or lens group with positive focal power, which has a positive focal length and has the effect of converging light.

[0039] Lens or lens group with negative focal power, which has a negative focal length and has the effect of diverging light.

[0040] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical system, which refers to the vertical distance from the optical center of the lens or lens group to the focal plane when an infinite distant object forms a clear image through the lens or lens group. For thin lenses, the focal length is the distance from the lens center to the imaging plane; for thick lenses or lens groups, the focal length is equal to the effective focal length (EFL), which is the distance between the rear principal plane of the lens or lens group and the imaging plane.

[0041] Object side, bounded by the lens, the side where the object to be imaged is located.

[0042] Image side, bounded by the lens, the side where the image of the object to be imaged is located.

[0043] Object side surface, bounded by the lens, the side where the object to be imaged is located, and the surface of the lens close to the object side is called the object side surface.

[0044] Image side surface, bounded by the lens, the side where the image of the object to be imaged is located, and the surface of the lens close to the image side is called the image side surface.

[0045] Imaging surface, located on the image side of all lenses in the optical lens, and the light forms an image after passing through each lens in the optical lens.

[0046] Aperture, a device used to control the amount of light passing through the lens into the body of the camera, it is usually inside the lens.

[0047] F-number, also known as Fno, is a relative value (the reciprocal of the relative aperture) derived from the focal length of the lens / the diameter of the lens entrance pupil. The smaller the F-number, the more light enters in the same unit of time. The larger the F-number, the smaller the depth of field, and the background content of the photograph will be blurred, similar to the effect of a telephoto lens.

[0048] Abbe number (Abbe), i.e. dispersion coefficient, is the difference ratio of the refractive index of optical material at different wavelengths, representing the degree of material dispersion.

[0049] Field of view (FOV) in optical instruments is the angle formed by the two edges of the maximum range of the object image that can pass through the lens of the optical instrument with the lens as the vertex. The size of the field of view determines the field of view of the optical instrument. The larger the field of view, the larger the field of view, and the smaller the optical magnification.

[0050] Aberration: The near-axis region of an optical system has the properties of an ideal optical system. A point on the object emits near-axis light rays that intersect at a point (i.e. near-axis image point) on the image plane. However, the light rays passing through different apertures of the lens are difficult to perfectly intersect at a point, but have a certain deviation from the position of the near-axis image point. These differences are collectively referred to as aberration.

[0051] Optical axis is a light ray that passes vertically through the center of an ideal lens. When parallel light rays enter a convex lens, the ideal convex lens should converge all light rays at a point behind the lens. This point where all light rays converge is called the focal point. When light rays propagate along the optical axis, their transmission direction does not change.

[0052] Longitudinal spherical aberration, also known as longitudinal chromatic aberration or position chromatic aberration or axial aberration, is a type of aberration that occurs when a bundle of parallel light rays converges at different positions before and after passing through a lens. This type of aberration is called position chromatic aberration or axial aberration. This is because the lens images different wavelengths of light at different positions, causing the image plane of different colors to be offset, resulting in chromatic dispersion.

[0053] Distortion, also known as distortion, is the degree of distortion of the image formed by an optical system relative to the object itself. Distortion is caused by the effect of the stop spherical aberration. The intersection height of the chief ray of different fields passing through the optical system and the Gaussian image plane 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.

[0054] Astigmatism, due to the object point not on the optical axis of the optical system, the light beam emitted by it has a tilt angle with the optical axis. After the light beam is refracted by the lens, the convergence points of the meridional pencil of rays and the sagittal pencil of rays are not on one point. That is, the light beam cannot be focused on a point, the image is not clear, and therefore astigmatism is generated. The meridional pencil of rays and the sagittal pencil of rays are the names of the light beams in two perpendicular planes in a rotationally symmetric optical system.

[0055] Curvature of field, the curvature of field is used to represent the difference between the position of the most clear image point of the light rays in the non-central field of view after passing through the optical lens group and the position of the most clear image point of the central field of view on the optical axis. When the lens has curvature of field, the intersection points of the entire light beam do not coincide with the ideal image point, although a clear image point can be obtained at each specific point, but the entire image plane is a curved surface.

[0056] The technical solutions in the embodiments of the present application will be described below with reference to the drawings. In the description of the embodiments of the present application, the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include one or more of the features.

[0057] The present application provides an optical lens, a camera module using the optical lens, and an electronic device comprising the camera module. The optical lens comprises a first lens group and a second lens group arranged from an object side to an image side, the first lens group has a positive focal power, the second lens group has a negative focal power, and the first lens group and / or the second lens group is a focusing lens group. During the focusing process of the optical lens from a far scene to a near scene, the distance between the first lens group and the second lens group increases, and the effective focal length of the optical lens decreases. The optical lens satisfies the following relationship: F2 / EFL>-5, F2 is the focal length of the second lens group, The effective focal length of the optical lens. The present application limits the optical power of the first lens group and the second lens group and limits F2 / EFL>-5, so that the optical lens has the characteristics of long focal length, macro and large aperture, and can realize miniaturization. Specifically, the first lens group has positive optical power, and the first lens group is used for beam convergence, so that the diameter of the light beam entering the second lens group is small, the aperture of the second lens group is no longer the maximum limit of the light aperture, which is beneficial to the miniaturization and large aperture design of the optical lens, effectively increases the light aperture, and realizes a small aperture number. The second lens group has negative optical power, which is beneficial to realize long focal length design and realize focusing and macro focusing. By limiting F2 / EFL>-5, it can ensure that the second lens group has a large enough optical power, can reduce the focusing stroke, has strong focusing ability, and has good image quality and high imaging clarity when shooting objects at different distances. The optical lens of the present application not only can shoot long distance, but also can shoot close distance, and the optical lens of the present application has good shooting effect on the object distance between infinity and 20mm.

[0058] The present application provides an electronic device, which can be a mobile phone, a tablet computer, a laptop computer, a wearable device, etc. with a photographing or video shooting function. Please refer to Figure 1 , Figure 1 The present application provides an electronic device, which can be a mobile phone, a tablet computer, a laptop computer, a wearable device, etc. with a photographing or video shooting function. Please refer to

[0059] The electronic device 1000 includes a housing 100, a camera module 200 and an image processor 300. The camera module 200 and the image processor 300 are located in the housing 100, and the camera module 200 is in communication connection with the image processor 300. The camera module 200 is used to acquire image data and input the image data to the image processor 300, and the image processor 300 is used to process the image data acquired from the camera module 200. The communication connection between the camera module 200 and the image processor 300 can include data transmission through electrical connection such as wiring, or data transmission through coupling. It can be understood that the camera module 200 and the image processor 300 can also be in communication connection through other data transmission modes.

[0060] The function of the image processor 300 is to optimize the digital image signal through a series of complex mathematical algorithm operations, and finally transmit the processed signal to the display for display. The image processor 300 can be an image processing chip or a digital signal processing chip (DSP), etc., which can process image signals and digital signals. Its role is to quickly transmit the data obtained by the photosensitive chip of the camera module 200 to the central processor and refresh the photosensitive chip, so the quality of the DSP chip and its stability directly affect the picture quality (such as color saturation, definition, etc.).

[0061] In one specific embodiment, the camera module 200 can be arranged on the back of the electronic device 1000, and the camera module 200 serves as the rear camera of the electronic device 1000. In other embodiments, the camera module 200 can also be arranged on the front of the electronic device 1000, and serves as the front camera of the electronic device 1000. Both the front camera and the rear camera can be used for self-shooting, and can also be used for the shooter to shoot other objects.

[0062] It can be understood that, Figure 1 The mounting position of the camera module 200 of the electronic device 1000 of the embodiment shown is only illustrative, and the application does not strictly limit the mounting position of the camera module 200. In some other embodiments, the camera module 200 can also be mounted on other positions of the electronic device 1000, for example, the camera module 200 can be mounted on the upper middle or upper right corner of the electronic device 1000. Alternatively, the camera module 200 can also not be arranged on the main body of the mobile phone, but arranged on an auxiliary component that is movable or rotatable relative to the main body of the mobile phone, for example, the auxiliary component can be extended, retracted or rotated from the main body of the mobile phone.

[0063] In some embodiments, the electronic device 1000 can further include an analog-to-digital converter (also referred to as an A / D converter, Figure 1 (not shown). The analog-to-digital converter is connected between the camera module 200 and the image processor 300. The analog-to-digital converter is used to convert the signal generated by the camera module 200 into a digital image signal and transmit it to the image processor 300, and then the digital image signal is processed by the image processor 300, and finally the image or video is displayed through the display.

[0064] In some embodiments, the electronic device 1000 can further include a memory Figure 1(Not shown) The memory is communicatively connected to the image processor 300. The image processor 300 processes the digital image signal and then transmits the image to the memory so that the image can be retrieved from the memory and displayed on the monitor when needed later. In some embodiments, the image processor 300 also compresses the processed digital image signal before storing it in the memory to save memory space.

[0065] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a camera module 200 according to the first embodiment of this application. The camera module 200 includes an optical lens 10, a filter 20, and a photosensitive element 30. The photosensitive element 30 is located on the image side of the optical lens 10, and when the camera module 200 is working, the scene to be imaged passes through the optical lens 10 and is filtered by the filter 20 before being imaged on the photosensitive element 30. The optical lens 10 affects the image quality and image effect. After the light from the scene passes through the optical lens 10, a clear image is formed on the imaging surface, and the image of the scene is recorded by the photosensitive element 30. It can be understood that the imaging element in the optical lens 10 can be the photosensitive element 30 or other imaging elements, and this application does not limit this. Specifically, the working principle of the camera module 200 is as follows: the light reflected from the scene passes through the optical lens 10 to generate an optical image, which is projected onto the surface of the photosensitive element 30. The photosensitive element 30 converts the optical image into an electrical signal, i.e., an analog image signal, and transmits the converted analog image signal to the image processor 300.

[0066] The photosensitive element 30 is a semiconductor chip containing hundreds of thousands to millions of photodiodes on its surface, which generate electrical charges when exposed to light. The photosensitive element 30 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. CCDs are made using a highly sensitive semiconductor material that converts light into electrical charges. CCDs consist of many photosensitive units, typically measured in megapixels. When light shines on the surface of a CCD, each photosensitive unit reflects a charge onto the component; the signals generated by all the photosensitive units are added together to form a complete image. CMOS devices primarily utilize semiconductors made of silicon and germanium, allowing N-type (negative) and P-type (positive) semiconductors to coexist on the CMOS. The current generated by these complementary effects can be recorded and interpreted by the image sensor as an image.

[0067] The filter 20 is used to filter out unwanted wavelengths of light, preventing the photosensitive element 30 from producing false colors or ripples, thereby improving its effective resolution and color reproduction. For example, the filter 20 can be an infrared filter. In this embodiment, the filter 20 is a separate component. In other embodiments, the filter structure may be omitted, and filtering can be achieved by surface treatment or material treatment of at least one optical element of the optical lens 10. This application does not strictly limit the specific embodiments of the structure or component used to achieve filtering.

[0068] The optical lens 10 of this application can be a pop-up lens or a periscope lens. This application describes the optical lens 10 as a pop-up lens. When the optical lens 10 is a telescopic lens, it has a smaller footprint, freeing up more space inside the electronic device 1000 to accommodate components such as batteries.

[0069] Please refer to the following: Figure 2 , Figure 3 and Figure 4 , Figure 2 The camera module 200 shown is in a non-functional state. Figure 3 for Figure 2 The diagram shows the structure of the camera module 200 in one working state. Figure 4 for Figure 2 The diagram shows the structure of the camera module 200 in another working state. Figure 3 for Figure 2 The image shows the camera module 200 in its long-range working state at infinity. Figure 4 for Figure 2 The image shows the close-up working state of the camera module during macro shooting at 200.

[0070] In this application, the optical lens 10 includes a first lens group G1 and a second lens group G2 arranged sequentially from the object side to the image side. The first lens group G1 has positive optical power, and the second lens group G2 has negative optical power. The first lens group G1 includes at least one lens with optical power, and the second lens group G2 includes at least one lens with optical power.

[0071] The first lens group G1 and / or the second lens group G2 are focusing lens groups. In an example, only the first lens group G1 can move along the optical axis O to focus during a focusing process, only the second lens group G2 can move along the optical axis O to focus during the focusing process, or both the first lens group G1 and the second lens group G2 can move along the optical axis O to focus during the focusing process. During the focusing process of switching the optical lens 10 from a far scene to a close-up scene, the distance between the first lens group G1 and the second lens group G2 increases, and the effective focal length of the optical lens 10 decreases. In other words, the focal length of the optical lens 10 when the object distance is micro-distance is smaller than the focal length when the object distance is infinity. During the focusing process of switching the optical lens 10 from a far scene to a close-up scene, the second lens group G2 can move along the optical axis O to the image side, or the first lens group G1 can move along the optical axis O to the object side, or the first lens group G1 can move along the optical axis O to the object side and the second lens group G2 can move along the optical axis O to the image side, so as to increase the distance between the first lens group G1 and the second lens group G2, and achieve the effect of micro-distance focusing.

[0072] The optical lens 10 satisfies the relationship: F2 / EFL>-5, F2 is the focal length of the second lens group G2, is the effective focal length of the optical lens 10. In an example, the value of F2 / EFL can be -1, -1.5, -2, -3, or -4, etc.

[0073] It should be noted that when the object distance is infinity, the optical lens 10 of the present application is a fixed-focus lens, and when the object distance is switched from infinity to micro-distance, the focal length of the optical lens 10 decreases.

[0074] The present application limits the focal power of the first lens group G1 and the second lens group G2 and limits F2 / EFL>-5, so that the optical lens 10 has the characteristics of long focal length, macro and large aperture, and can be miniaturized. The first lens group G1 has positive focal power, and the first lens group G1 is used for beam convergence, so that the diameter of the light beam entering the second lens group G2 is small, and the aperture of the second lens group G2 is no longer the maximum limit of the light aperture, which is beneficial to the miniaturization and large aperture design of the optical lens 10, effectively increases the light aperture, and realizes a small aperture number. The second lens group G2 has negative focal power, which is beneficial to realize long focal length design and is used to realize focusing and macro focusing, has small focusing stroke and strong focusing ability. By limiting F2 / EFL>-5, the second lens group G2 can have a large enough focal power, the focusing stroke can be reduced, the focusing ability is strong, and the image quality is high when shooting objects at different distances. The optical lens 10 with long focal length characteristics has the characteristics of small depth of field, and the optical lens 10 with large aperture characteristics also has the characteristics of small depth of field, which is beneficial to realize the shooting effect of background blurring when the object distance is large. The optical lens 10 of the present application can not only be used for long distance shooting, but also be used for close-up macro shooting. The optical lens 10 of the present application has good shooting effect on objects with object distance from infinity to 20mm, and when the object distance is between 20mm and 50mm, the focusing stroke is small and the imaging quality is high.

[0075] According to the application of optical theory, when two lens groups with focal lengths of Fa and Fb are arranged with a distance d, the focal length F of the combined system of the two lens groups satisfies: 1 / F=1 / Fa+1 / Fb-d / (Fa×Fb). In the present embodiment, since the focal length of the first lens group G1 is positive and the focal length of the second lens group G2 is negative, when the second lens group G2 moves towards the image side or the first lens group G1 moves towards the object side, the distance d between the first lens group G1 and the second lens group G2 increases, so the combined focal length of the first lens group G1 and the second lens group G2 decreases. Therefore, in the present embodiment, when the second lens group G2 moves towards the image side or the first lens group G1 moves towards the object side, the combined focal length of the first lens group G1 and the second lens group G2 shows a decreasing trend, which is beneficial to realize macro shooting.

[0076] In the present embodiment, reasonable configuration of the value of F2 helps to compensate for the image plane drift caused by the change of the object plane during macro focusing using a smaller displacement, which in turn suppresses the deterioration of aberration caused by focusing.

[0077] In some embodiments, the optical lens 10 comprises a third lens group G3 located on the image side of the second lens group G2, the third lens group G3 can have positive or negative focal power, and the third lens group G3 comprises at least one lens with focal power. During focusing, the position of the third lens group G3 can be fixed, or the third lens group G3 can also move along the optical axis O. The third lens group G3 is used to correct the field curvature and improve the imaging quality of the optical lens 10. Exemplarily, the third lens group G3 can have negative focal power, at this time, the third lens group G3 acts as a flat field mirror, which can compensate for part of the field curvature change caused by focusing, thereby greatly enhancing the focusing ability of the second lens group G2, making the focusing ability of the optical lens 10 strong, and also being conducive to achieving uniform image quality when the object distance changes from infinity to a finite distance, and the imaging quality of the camera module 200 is higher. In other embodiments, the third lens group G3 has positive focal power to match the special structural requirements of the different moving directions of the second lens group G2 in the automatic focusing process.

[0078] With reference to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , Figure 5 are simplified structure diagrams of the optical lens in different states. When the camera module 200 is switched from the non-working state (storage state) to the working state (long shot state or close-up state), the first lens group G1 and the second lens group G2 move in the direction of the object side along the optical axis O, and the third lens group G3 is stationary. When the camera module 200 is switched from the working state to the non-working state, the first lens group G1 and the second lens group G2 move in the direction of the image side along the optical axis O, and the third lens group G3 is stationary. In other embodiments, the third lens group G3 can also move in the direction of the object side or the image side.

[0079] When the camera module 200 is switched from the long shot state to the close-up state, the second lens group G2 moves in the direction of the image side along the optical axis O, and the first lens group G1 and the third lens group G3 are stationary to achieve focusing. In other embodiments, when the camera module 200 is switched from the long shot state to the close-up state, the first lens group G1 can also move in the direction of the object side along the optical axis O, and the third lens group G3 can also move in the direction of the object side or the image side along the optical axis O.

[0080] When the camera module 200 switches from the close-up state to the telephoto state, the second lens group G2 moves along the optical axis O to the object side, and the first lens group G1 and the third lens group G3 are stationary, so as to realize focusing. In other embodiments, when the camera module 200 switches from the telephoto state to the close-up state, the first lens group G1 moves along the optical axis O to the object side, and when the camera module 200 switches from the close-up state to the telephoto state, the first lens group G1 can also move along the optical axis O to the image side. The third lens group G3 can move along the optical axis O to the object side or the image side, or can be stationary.

[0081] In some embodiments, the first lens group G1 includes at least two lenses, and the Abbe numbers of the at least two lenses in the first lens group G1 are different. For example, the first lens group G1 includes a first lens, a second lens, and a third lens, and the Abbe numbers of the first lens, the second lens, and the third lens are different. Color aberration is corrected by lenses with different Abbe numbers, and therefore, by setting the Abbe numbers of the different lenses in the first lens group G1 to be different, the influence of color aberration on image quality is reduced. In other embodiments, the Abbe numbers of the different lenses in the first lens group G1 can also be the same, or the Abbe numbers of some lenses are the same and the Abbe numbers of some lenses are different, which is not limited in the present application.

[0082] In some embodiments, the optical lens 10 satisfies: Vd1≥18, and Vd1 is the Abbe number of the first lens. For example, the Abbe number of the first lens L1 can be 30, 40, or 50, etc. By limiting the Abbe number of the first lens to be greater than 18, the first lens group G1 has a relatively large Abbe number, and at this time, the first lens group G1 can ensure that no excessive residual color aberration is generated, and the design difficulty of the lens group located on the image side of the first lens group G1 is reduced.

[0083] In some embodiments, the second lens group G2 includes at least two lenses, and the Abbe numbers of the at least two lenses in the second lens group G2 are different, so as to correct color aberration and improve imaging quality. In other embodiments, the Abbe numbers of the different lenses in the second lens group G2 can also be the same, or the Abbe numbers of some lenses are the same and the Abbe numbers of some lenses are different, which is not limited in the present application.

[0084] In some embodiments, the material of at least one lens in the first lens group G1 is glass. The lens made of glass material is beneficial to improve imaging quality, reduce color aberration and temperature drift effect of the optical lens 10, and avoid the influence of temperature change on the focal length of the optical lens 10. It can be understood that the lenses in the first lens group G1, the second lens group G2, and the third lens group G3 can all be made of glass material, or all be made of plastic material, or both glass lenses and plastic lenses are provided. The lens made of glass material is beneficial to improve imaging quality, reduce color aberration and temperature drift effect, and the lens made of plastic material can reduce the weight and cost of the optical lens 10.

[0085] In some embodiments, the first lens group G1 includes a first lens L1, and a region close to the optical axis on the object side of the first lens L1 is convex, which is conducive to converging the light beam, so that the diameter of the light beam entering the second lens group G2 is smaller, thereby effectively increasing the light aperture of the optical lens 10 while taking into account the size of the module, and the optical lens 10 has a smaller aperture value. The region close to the optical axis on the object side of the first lens L1 refers to a region of 1 / 50 of the aperture height of the object side of the first lens L1. The object side of the first lens L1 can be a spherical surface, which is conducive to reducing the processing difficulty, or a non-spherical surface, which increases the design freedom and is conducive to improving the image quality.

[0086] In some embodiments, the first lens group G1 includes a first lens L1, a second lens L2 and a third lens L3 arranged from the object side to the image side, 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. In this embodiment, by reasonably configuring the focal powers of the first lens L1, the second lens L2 and the third lens L3, the design of a large aperture is facilitated, the light aperture is increased, and good imaging quality can be ensured.

[0087] In some embodiments, the optical lens 10 satisfies 0.5≤TTL / EFL≤5, TTL is the distance on the optical axis from the object side of the first lens of the first lens group to the imaging surface in the working state. The first lens L1 is the lens closest to the object side in the first lens group G1. Exemplarily, the value of TTL / EFL can be 1, 1.5, 2, 2.5, 3 or 4, etc. By limiting the range of TTL / EFL, the miniaturization of the optical lens 10 is facilitated.

[0088] In some embodiments, the optical lens 10 satisfies F1 / EFL≤5, F1 is the focal length of the first lens group G1. Exemplarily, the value of F1 / EFL can be 1, 1.5, 2, 2.5 or 3.5, etc. By limiting the appropriate range of F1 / EFL, the focal power of the first lens group G1 can be reasonably configured, the aperture number is reduced, the design of a large aperture is facilitated, the light aperture is increased, and good imaging quality can be ensured.

[0089] In some embodiments, the optical lens 10 satisfies 1mm≤φ1≤30mm, φ1 is the maximum effective area diameter of the first lens group G1. Exemplarily, the value of φ1 can be 4mm, 10mm, 20mm, 22mm or 25mm, etc. The larger the maximum effective area diameter of the first lens group G1, the larger the target surface size of the optical lens 10 can be, so that the optical lens 10 has the characteristics of a large target surface, which is conducive to increasing the clarity of the image and improving the imaging quality.

[0090] In some embodiments, the optical lens 10 satisfies: 1mm≤φ2≤30mm, where φ2 is the maximum effective area diameter of the second lens group G2. For example, φ2 can be 4mm, 10mm, 20mm, 22mm, 25mm, or the like. The larger the maximum effective area diameter of the second lens group G2, the larger the target surface size of the optical lens 10, which makes the optical lens 10 have a large target surface feature, and is beneficial to increasing the clarity of imaging and improving the imaging quality.

[0091] In some embodiments, the optical lens 10 satisfies the relationship: 0.3mm≤h1≤50mm, where h1 is the maximum pop-up height of the first lens group G1, and the maximum pop-up height of the first lens group G1 refers to the maximum distance of the first lens group G1 moving when the optical lens 10 is switched from an inactive state to an active state. For example, h1 can be 1mm, 10mm, 20mm, 30mm, 40mm, or the like. In the present application, the maximum pop-up height of the first lens group G1 is small, i.e., the displacement of the first lens group G1 is small, which reduces the power requirement of the motor and reduces the volume of the motor used to drive the movement of the first lens group, making the camera module 200 more easily miniaturized.

[0092] In some embodiments, the optical lens 10 satisfies the relationship: 0.3mm≤h2≤50mm, where h2 is the maximum pop-up height of the second lens group G2, and the maximum pop-up height of the second lens group G2 refers to the maximum distance of the second lens group G2 moving when the optical lens 10 is switched from an inactive state to an active state. For example, h2 can be 1mm, 10mm, 20mm, 30mm, 40mm, or the like. In the present application, the maximum pop-up height of the second lens group G2 is small, i.e., the displacement of the second lens group is small, which reduces the power requirement of the motor and reduces the volume of the motor used to drive the movement of the second lens group G2, making the camera module 200 more easily miniaturized.

[0093] In some embodiments, the object distance range of the optical lens 10 is from infinity to 20mm, and the optical lens 10 of the present application can clearly image within the object distance range from infinity to 20mm. It should be noted that the object distance of the present application is greater than or equal to 2500mm, and the object distance of the present application is less than or equal to 200mm. For example, the present application can implement micro-distance shooting with an object distance of 50mm or 20mm.

[0094] In some embodiments, the focusing stroke of the second lens group G2 is less than or equal to 50mm, and the focusing stroke of the second lens group G2 is greater than 50mm, which requires high power of the motor. By limiting the focusing stroke of the second lens group G2 to be less than or equal to 50mm, the power requirement of the motor is low.

[0095] In some embodiments, the optical lens 10 comprises a variable aperture, the size of the variable aperture decreases during the focusing process of the optical lens 10 from the long shot to the close shot. When shooting the long shot, the size of the aperture can be adjusted to increase the aperture size, the depth of field is shallow, the bokeh effect is good, and it is beneficial to the long shot. When shooting the macro shot, the bokeh effect is not suitable for improving the clarity of the shot, so the variable aperture needs to be adjusted to increase the depth of field when shooting the macro shot, and improve the quality of the macro shot.

[0096] The variable aperture can be located at any position of the first lens group G1, or at any position of the second lens group G2, or at any position between the first lens group G1 and the second lens group G2, which is not limited in the present application.

[0097] The variable aperture can be a ring structure or a variable petal structure, or the variable aperture can be realized by surface spraying process, for example, by spraying a light shielding material on the lens to form a variable aperture. The position of the variable aperture can be fixed or variable. For example, the position of the variable aperture is variable, and the variable aperture can be adjusted according to the focusing condition to be located between different lenses.

[0098] In some embodiments, the optical lens 10 satisfies the relationship: 0.5≤Fno≤8, Fno is the aperture number of the optical lens 10. The smaller Fno is, the larger the aperture is, and the larger Fno is, the smaller the aperture is. For example, the value of Fno can be 0.8, 1.6, 1.8, 2.4 or 4, etc. When shooting the long shot, the variable aperture can be adjusted to reduce Fno to get a large aperture, the bokeh effect is good, and it is beneficial to the long shot. When shooting the macro shot, Fno is increased to reduce the aperture to improve the quality of the macro shot.

[0099] In some embodiments, the optical lens 10 satisfies the relationship: 5mm≤ox1+ox2+ox3≤30mm, ox1 is the thickness of the first lens group G1 on the optical axis, ox2 is the thickness of the second lens group G2 on the optical axis, and ox3 is the thickness of the third lens group G3 on the optical axis. For example, the value of ox1+ox2+ox3 can be 10mm, 15mm or 20mm, etc. The optical lens 10 of the present application can be used in a pop-up camera module or a periscope camera module. Taking the pop-up type as an example, the present application limits ox1+ox2+ox3≤30mm to ensure that the optical lens 10 has a smaller size when it is stored, avoiding the protrusion of the optical lens 10 part, affecting the weight and appearance, and by limiting ox1+ox2+ox3≥5mm, the optical lens 10 has the characteristics of a large target surface, which is beneficial to increase the clarity of the imaging and improve the imaging quality.

[0100] In some embodiments, at least one lens in the third lens group has an aspheric optical surface. In this way, different optical powers are provided from the paraxial region to the outer field region, so that the imaging image has more balanced image quality, aberrations are corrected, and the imaging quality is improved. In addition, at least one lens of the optical lens 10 can have a free-form surface to correct aberrations. In this case, the aspheric surface is a surface that is rotationally symmetric about the optical axis O; the free-form surface can have no symmetry axis, or can be symmetric along a certain direction, or symmetric along two directions.

[0101] In some embodiments, the optical lens 10 includes a liquid lens and / or a liquid crystal lens, and the liquid lens and / or the liquid crystal lens are located in the first lens group G1. In this embodiment, the focusing effect can be enhanced by the liquid lens or the liquid crystal lens to achieve super-macro shooting. In this case, the liquid lens is a structure that uses liquid as a lens and changes the focal length by changing the curvature of the liquid. In other embodiments, the liquid lens or the liquid crystal lens can also be located in the second lens group G2.

[0102] In some embodiments, the optical lens 10 includes a diffractive element, and the diffractive element is located in the first lens group. In this embodiment, the diffractive element is used to reduce chromatic aberration and reduce the size of the optical lens, so as to improve the imaging quality of the optical lens 10 and realize the miniaturization of the optical lens 10.

[0103] In some embodiments, at least one lens of the optical lens 10 can adopt a special-shaped technology to reduce the size of the optical lens 10. For example, at least one lens in the first lens group G1 can have a cutout for reducing the height of the lens. The cutout can be realized by an I-CUT process. By providing a cutout for reducing the height of the lens on at least one lens in the first lens group G1, the size of the optical lens 10 in the height direction can be effectively reduced, so that the optical lens 10 can be better applied to small-sized electronic devices, and the application range of the optical lens 10 is increased. In addition, since the height of the lens is reduced by the cutout, the lens can have a larger light aperture, so as to increase the light flux of the optical lens 10 and improve the imaging quality of the optical lens 10. In addition, the special-shaped technology can also be used on the structural support of the lens, such as the lens barrel and the spacer, to reduce the size of the optical lens.

[0104] In some embodiments, the peripheral surface or the supporting surface of at least one lens of the optical lens 10 can be blackened or roughened to eliminate stray light and improve the imaging quality. In this case, the blackening treatment can be coating or plating black ink or other light-absorbing materials, or can be a film. The roughening treatment is mainly used to increase the roughness. Of course, in other embodiments, the optical lens 10 can also eliminate stray light by other means, which are not strictly limited in the embodiments of the present application.

[0105] In some embodiments, the optical lens 10 satisfies the relationship: 2mm≤ImgH≤10mm, where ImgH is the maximum image height of the optical lens, and the diagonal size of the photosensitive element is twice the maximum image height of the optical lens. By limiting the range of ImgH, the embodiments of the present application make the optical lens have the characteristics of a large target surface and high definition of image quality.

[0106] In some embodiments, the optical lens 10 satisfies the relationship: FOV≤140°, where FOV is the full field of view angle of the optical lens 10.

[0107] In some embodiments, the plurality of lenses of the optical lens 10 are assembled through an active alignment (AA) process to ensure assembly accuracy.

[0108] In some embodiments, when the object side surface and / or the image side surface of some lenses in the optical lens 10 are aspheric surfaces, the object side surface and / or the image side surface of some lenses can be defined using, but not limited to, the following aspheric surface formula:

[0109] where z is the relative distance of a point on the aspheric surface with a distance r from the optical axis to the tangent plane at the intersection point on the optical axis of the aspheric surface; r is the vertical distance of a point on the aspheric curve to the optical axis; c is the curvature; k is the conical coefficient; a is the aspheric coefficient of the i-th order. i is the aspheric coefficient of the i-th order.

[0110] The specific, but not limiting, examples of the present application will be described in more detail below through four embodiments and in combination with the accompanying drawings. Figures 2 to 22 The specific, but not limiting, examples of the present application will be described in more detail below through four embodiments and in combination with the accompanying drawings.

[0111] First Embodiment Please refer to Figure 2 , Figure 3 and Figure 4 , the camera module 200 includes an optical lens 10, a filter 20, and a photosensitive element 30. In this embodiment, the optical lens 10 includes, in order from the object side to the image side, an aperture 40, a first lens group G1, a second lens group G2, and a third lens group G3. The first lens group G1 has positive refractive power, the first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3, the second lens group G2 has negative refractive power, the second lens group G2 includes a fourth lens L4 and a fifth lens L5, the third lens group G3 has positive refractive power, the third lens group G3 includes a sixth lens L6, and the first lens L1 to the sixth lens L6 are arranged in order from the object side to the image side. The aperture 40 is a variable aperture, and the size of the aperture can be adjusted according to requirements. The aperture 40 is located on the object side of the first lens L1. In other embodiments, the aperture 40 can also be located at other positions, which are not limited in the present application.

[0112] In this embodiment, the first lens L1 has positive refractive power, the first lens L1 includes an object side surface S1 and an image side surface S2, the second lens L2 has negative refractive power, the second lens L2 includes an object side surface S3 and an image side surface S4, the third lens L3 has positive refractive power, the third lens L3 includes an object side surface S5 and an image side surface S6, the fourth lens L4 has negative refractive power, the fourth lens L4 includes an object side surface S7 and an image side surface S8, the fifth lens L5 has positive refractive power, the fifth lens L5 includes an object side surface S9 and an image side surface S10, and the sixth lens L6 has positive refractive power, the sixth lens L6 includes an object side surface S11 and an image side surface S12. In addition, the filter 20 is disposed behind the sixth lens L6 and includes an object side surface S13 and an image side surface S14. An imaging surface S15 (not labeled) is located on the image side of all the lenses in the optical lens 10, and the imaging surface S15 is a carrier surface on which the image of the light rays is formed after the light rays pass through the lenses in the optical lens 10 in sequence. Figure 2 , Figure 3 and Figure 4 The imaging surface S15 is located on the image side of all the lenses in the optical lens 10, and the imaging surface S15 is a carrier surface on which the image of the light rays is formed after the light rays pass through the lenses in the optical lens 10 in sequence.

[0113] In this embodiment, the first lens L1 is made of glass, and the second lens L2 to the sixth lens L6 are made of plastic. In other embodiments, the lenses in the first lens group G1, the second lens group G2, and the third lens group G3 can all be made of glass or all be made of plastic, or both glass and plastic, which is not limited in the present application.

[0114] In this embodiment, when the camera module 200 is switched from the non-working state (storage state) to the working state (telephoto state or close-up state), the first lens group G1 and the second lens group G2 move in the object side direction along the optical axis O, and the third lens group G3 is stationary; when the camera module 200 is switched from the working state to the non-working state, the first lens group G1 and the second lens group G2 move in the image side direction along the optical axis O, and the third lens group G3 is stationary, so that the overall size of the camera module 200 is relatively low and does not cause the corresponding part of the electronic device 1000 to protrude.

[0115] In this embodiment, when the camera module 200 is switched from the telephoto state to the close-up state, the second lens group G2 moves in the image side direction along the optical axis O, and the first lens group G1 and the third lens group G3 are stationary to achieve focusing.

[0116] In this embodiment, when the camera module 200 is switched from the close-up state to the telephoto state, the second lens group G2 moves in the object side direction along the optical axis O, and the first lens group G1 and the third lens group G3 are stationary to achieve focusing.

[0117] Please refer to Table 1a, which is the radius of curvature, thickness, refractive index (Nd) and Abbe number of each lens and filter 20 of the optical lens 10 in the first embodiment in the working state of the far view and the near view. Among them, the thickness includes the thickness of the lens itself and the spacing between the lenses, and the Abbe number is also the dispersion coefficient.

[0118] Table 1a

[0119] In Table 1a, 0.1068 / 2.3500 means that the spacing between the first lens group G1 and the second lens group G2 on the optical axis is 0.1068 mm when the object distance is infinity, and the spacing between the first lens group G1 and the second lens group G2 on the optical axis is 2.3500 mm when the object distance is 50 mm. 4.6882 / 2.4450 means that the spacing between the second lens group G2 and the third lens group G3 on the optical axis is 4.6882 mm when the object distance is infinity, and the spacing between the first lens group G1 and the second lens group G2 on the optical axis is 2.4450 mm when the object distance is 50 mm.

[0120] Please refer to Table 1b, which is the asphericity coefficient of each lens of the optical lens 10 in the first embodiment.

[0121] Table 1b

[0122] In this embodiment, the object side and the image side of the first lens L1 to the sixth lens L6 are aspheric surfaces, which can be defined by the following aspheric surface formula, but not limited to:

[0123] Wherein z is the relative distance of the point on the aspheric surface with a distance r from the optical axis to the tangent plane of the intersection point on the optical axis of the aspheric surface; r is the vertical distance of the point on the aspheric curve to the optical axis; c is the curvature; k is the conical coefficient; a i is the asphericity coefficient of the i-th order.

[0124] Please refer to Table 1c, which is the basic parameters of the optical lens 10 in the first embodiment. In Table 1c, f1 to f6 are the focal lengths of the first lens L1 to the sixth lens L6, respectively, F1 to F3 are the focal lengths of the first lens group G1 to the third lens group G3, respectively, ImgH is the maximum image height of the optical lens 10, which is half of the diagonal size of the photosensitive element, and Fno is the aperture number.

[0125] Table 1c

[0126] In the embodiment, when the optical lens 10 is switched from a long shot to a close shot, for example, to focus at a micro distance of 50 mm, the distance between the first lens group G1 and the second lens group G2 is increased from 0.1068 mm to 2.3500 mm, and the focusing stroke of the second lens group G2 is 2.2432 mm. The short focusing stroke and good focusing effect can achieve good micro distance shooting effect. In the embodiment, the micro distance focusing shooting is achieved by moving the second lens group G2 to the image side, and the first lens group G1 is not moved, so that the micro distance shooting can be achieved without increasing the size of the optical lens 10.

[0127] Please refer to Figure 6 , Figure 6 is a representation diagram of the optical performance of the optical lens 10 in the first embodiment when the object distance is infinite.

[0128] wherein, Figure 6 includes an axial chromatic aberration curve diagram, a field curvature diagram, and a distortion diagram of the optical lens 10 when the object distance is infinite. The axial chromatic aberration curve diagram includes a spherical aberration curve corresponding to different wave bands (the diagram includes 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm) of the system; the physical meaning is that the light of the corresponding wavelength emitted at 0 degree field is deviated from the ideal image point after passing through the optical system; the abscissa is the deviation value in the optical axis direction, and the ordinate is the normalized coordinate at the pupil. Figure 6 The values shown in the diagram are small, and the on-axis aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The field curvature diagram is used to show the deviation of the converging point of the light beam in different fields from the ideal imaging surface. The solid line S is the sagittal direction light beam, and the dashed line T is the tangential direction light beam. The abscissa is the deviation value in the optical axis direction, and the ordinate is the corresponding field. When the field value is too large, the image quality of the field is poor or there is high-order aberration. Figure 6 The field curvature in the two directions shown is small, and the system has good depth of focus. The distortion diagram is used to represent the relative deviation of the converging point (actual image height) of the light beam in different fields from the ideal image height. Figure 6 The distortion shown is within 2%, which can ensure that the picture is not obviously deformed.

[0129] Please refer to Figure 7 , Figure 7 is a representation diagram of the optical performance of the optical lens 10 in the first embodiment when the object distance is 50 mm.

[0130] wherein, Figure 7 includes an axial chromatic aberration curve diagram, a field curvature diagram, and a distortion diagram of the optical lens 10 when the object distance is 50 mm. The axial chromatic aberration curve diagram includes a spherical aberration curve corresponding to different wave bands (the diagram includes 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm) of the system, Figure 7The axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected, and the values of the two direction field curves are small. The astigmatic field curve is used to show the deviation of the converging point of the light beam in different fields from the ideal imaging surface. The solid line S is the sagittal direction light beam, and the dashed line T is the meridional direction light beam. When the value of a certain field is too large, the image quality of the field is poor or there is high-order aberration, Figure 7 The two direction field curves shown are small, and the system has good focal depth. The distortion graph is used to represent the relative deviation of the converging point (actual image height) of the light beam in different fields from the ideal image height, Figure 7 The distortion shown is within 3%, which can ensure that the picture does not have obvious deformation.

[0131] According to Figure 6 and Figure 7 , the optical lens 10 given in the first embodiment can achieve good imaging quality when the object distance is infinite and the micro distance is 50mm.

[0132] Second embodiment Please refer to Figure 8 , Figure 9 and Figure 10 , Figure 8 is a structure schematic diagram of a camera module 200 of the second embodiment of the present application, Figure 9 is Figure 8 a structure schematic diagram of the camera module 200 in a working state, Figure 10 is Figure 8 a structure schematic diagram of the camera module 200 in another working state. Figure 8 The camera module 200 shown is in a non-working state, Figure 9 is Figure 8 a telephoto working state of the camera module 200 when the object distance is infinite, Figure 10 is Figure 8 a close-up working state of the camera module 200 when micro distance shooting.

[0133] The camera module 200 comprises an optical lens 10, a filter 20 and a photosensitive element 30. In this embodiment, the optical lens 10 comprises, in sequence from the object side to the image side, an aperture 40, a first lens group G1, a second lens group G2 and a third lens group G3. The first lens group G1 has positive refractive power, and comprises a first lens L1, a second lens L2 and a third lens L3. The second lens group G2 has negative refractive power, and comprises a fourth lens L4, a fifth lens L5 and a sixth lens L6. The third lens group G3 has positive refractive power, and comprises a seventh lens L7. The first lens L1 to the seventh lens L7 are arranged in sequence from the object side to the image side. The aperture 40 is a variable aperture, and the size of the aperture can be adjusted according to requirements. The aperture 40 is located on the object side of the first lens L1. In other embodiments, the aperture 40 can also be located at other positions, which are not limited in the present application.

[0134] In this embodiment, the first lens L1 has positive refractive power, and comprises an object side S1 and an image side S2. The second lens L2 has negative refractive power, and comprises an object side S3 and an image side S4. The third lens L3 has positive refractive power, and comprises an object side S5 and an image side S6. The fourth lens L4 has negative refractive power, and comprises an object side S7 and an image side S8. The fifth lens L5 has positive refractive power, and comprises an object side S9 and an image side S10. The sixth lens L6 has negative refractive power, and comprises an object side S11 and an image side S12. The seventh lens L7 has positive refractive power, and comprises an object side S13 and an image side S14. In addition, the filter 20 is arranged behind the seventh lens L7, and comprises an object side S15 and an image side S16. An imaging surface S17 (not labeled) is located on the image side of all the lenses in the optical lens 10, and is a carrier surface on which an image formed by light rays passing through the lenses in the optical lens 10 in sequence. Figure 8 、 Figure 9 and Figure 10 In this embodiment, the first lens L1 is made of glass, and the second lens L2 to the seventh lens L7 are made of plastic.

[0135] In this embodiment, when the camera module 200 is switched from the non-working state (storage state) to the working state (long shot state or close-up state), the first lens group G1 and the second lens group G2 move in the direction of the object side along the optical axis O, and the third lens group G3 is stationary. When the camera module 200 is switched from the working state to the non-working state, the first lens group G1 and the second lens group G2 move in the direction of the image side along the optical axis O, and the third lens group G3 is stationary. This makes the overall size of the camera module 200 relatively low, and does not cause the corresponding part of the electronic device 1000 to protrude.

[0136] In the embodiment, when the camera module 200 switches from the telephoto state to the close-up state, the second lens group G2 moves along the optical axis O to the image side, and the first lens group G1 and the third lens group G3 are stationary to achieve focusing.

[0137] In the embodiment, when the camera module 200 switches from the close-up state to the telephoto state, the second lens group G2 moves along the optical axis O to the object side, and the first lens group G1 and the third lens group G3 are stationary to achieve focusing.

[0138] Please refer to Table 2a, which is the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 20 of the optical lens 10 in the telephoto and close-up states in the second embodiment. The thickness includes the thickness of the lens itself and the spacing between the lenses, and the Abbe number is the dispersion coefficient.

[0139] Table 2a

[0140] In Table 2a, 0.1 / 1.846 means that the spacing between the first lens group G1 and the second lens group G2 on the optical axis is 0.1 mm when the object distance is infinity, and the spacing between the first lens group G1 and the second lens group G2 on the optical axis is 1.846 mm when the object distance is 50 mm. 2.7640 / 1.018 means that the spacing between the second lens group G2 and the third lens group G3 on the optical axis is 2.7640 mm when the object distance is infinity, and the spacing between the first lens group G1 and the second lens group G2 on the optical axis is 1.018 mm when the object distance is 50 mm.

[0141] Please refer to Table 2b, which is the asphericity coefficient of each lens of the optical lens 10 in the second embodiment.

[0142] Table 2b

[0143] In the embodiment, the object side and the image side of the first lens L1 to the seventh lens L7 are aspheric surfaces, which can be defined by, but not limited to, the following aspheric surface formula:

[0144] where z is the relative distance of a point on the aspheric surface with a distance r from the optical axis to the tangent plane at the intersection point on the optical axis; r is the vertical distance of a point on the aspheric curve to the optical axis; c is the curvature; k is the conical coefficient; a i is the i-th order asphericity coefficient.

[0145] Please refer to Table 2c, which is the basic parameters of the optical lens 10 in the second embodiment. In Table 2c, f1-f7 are the focal lengths of the first lens L1 to the seventh lens L7, F1-F3 are the focal lengths of the first lens group G1 to the third lens group G3, ImgH is the maximum image height of the optical lens 10, which is half of the diagonal size of the photosensitive element, and Fno is the F-number.

[0146] Table 2c

[0147] In this embodiment, when the optical lens 10 is switched from a telephoto to a close-up, for example, to focus at a micro distance of 50 mm, the distance between the first lens group G1 and the second lens group G2 is increased from 0.1 mm to 1.846 mm, and the focusing stroke of the second lens group G2 is 1.746 mm. The short focusing stroke and good focusing effect can achieve good micro distance shooting effect. In this embodiment, the micro distance focusing shooting is achieved by moving the second lens group G2 to the image side, and the first lens group G1 does not move, so that the micro distance shooting can be achieved without increasing the size of the optical lens 10.

[0148] Please refer to Figure 11 , Figure 11 is a representation diagram of the optical performance of the optical lens 10 in the second embodiment when the object distance is infinity.

[0149] In Table 2c, f1-f7 are the focal lengths of the first lens L1 to the seventh lens L7, F1-F3 are the focal lengths of the first lens group G1 to the third lens group G3, ImgH is the maximum image height of the optical lens 10, which is half of the diagonal size of the photosensitive element, and Fno is the F-number. Figure 11 includes the axial chromatic aberration curve, the astigmatic field curve, and the distortion diagram of the optical lens 10 when the object distance is infinity. The axial chromatic aberration curve includes the spherical aberration curves corresponding to different wave bands (the diagrams include 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm). The physical meaning is that the light of the corresponding wavelength emitted at 0-degree field is deviated from the ideal image point after passing through the optical system. The horizontal coordinate is the deviation value in the optical axis direction, and the vertical coordinate is the normalized coordinate at the pupil. Figure 11 The values in Table 2c are small, and the on-axis aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatic field curve is used to show the deviation of the converging points of the light beams in different fields from the ideal imaging surface. The solid line S is the sagittal direction light beam, and the dashed line T is the tangential direction light beam. The horizontal coordinate is the deviation value in the optical axis direction, and the vertical coordinate is the corresponding field. When the field value is too large, the image quality of the field is poor or there is high-order aberration. Figure 11 The two direction field curves shown in Table 2c are small, and the system has good depth of focus. The distortion diagram is used to represent the relative deviation of the converging points (actual image height) of the light beams in different fields from the ideal image height. Figure 11 The distortion shown in Table 2c is within 2.5%, which can ensure that the picture does not have obvious deformation.

[0150] Please refer to Figure 12 ,Figure 12 is a representation of the optical performance of the optical lens 10 in the second embodiment when the object distance is 50mm.

[0151] wherein, Figure 12 includes the axial chromatic aberration curve, the field curvature curve and the distortion graph of the optical lens 10 when the object distance is 50mm. The axial chromatic aberration curve includes the spherical aberration curves corresponding to different wavebands (the graphs include 650nm, 610nm, 555nm, 510nm and 470nm) of the system, Figure 12 The values shown in the table are small, and the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the optical lens 10 are well corrected. The field curvature curve is used to show the deviation of the converging points of the light beams in different fields of view from the ideal imaging surface. The solid line S is the sagittal direction light beam, and the dashed line T is the tangential direction light beam. When the value of a certain field of view is too large, the image quality of the field of view is poor or there is high-order aberration, Figure 12 The field curvatures in the two directions shown are small, and the system has good depth of focus. The distortion graph is used to represent the relative deviation of the converging points (actual image height) of the light beams in different fields of view from the ideal image height, Figure 12 The distortions shown are all within 2.5%, which can ensure that the picture does not have obvious deformation.

[0152] According to Figure 11 and Figure 12 , it can be known that the optical lens 10 given in the second embodiment can achieve good imaging quality when the object distance is infinity and the object distance is 50mm in the macro mode.

[0153] Third Embodiment Please refer to Figure 13 , Figure 14 and Figure 15 , Figure 13 is a structural schematic diagram of a camera module 200 of the third embodiment of the present application, Figure 14 is a structural schematic diagram of the camera module 200 shown in Figure 13 in a working state, Figure 15 is a structural schematic diagram of the camera module 200 shown in Figure 13 in another working state. Figure 13 The camera module 200 shown is in a non-working state, Figure 14 is a telephoto working state of the camera module 200 shown in Figure 13 when the object distance is infinity, Figure 15 is a close-up working state of the camera module 200 shown in Figure 13 when the camera module 200 is in the macro mode.

[0154] The camera module 200 comprises an optical lens 10, a filter 20 and a photosensitive element 30. In this embodiment, the optical lens 10 comprises, in sequence from the object side to the image side, an aperture 40, a first lens group G1, a second lens group G2 and a third lens group G3. The first lens group G1 has positive refractive power, and comprises a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4. The second lens group G2 has negative refractive power, and comprises a fifth lens L5 and a sixth lens L6. The third lens group G3 has negative refractive power, and comprises a seventh lens L7. The first lens L1 to the seventh lens L7 are arranged in sequence from the object side to the image side. The aperture 40 is a variable aperture, and the size of the aperture can be adjusted according to requirements. The aperture 40 is located on the object side of the first lens L1. In other embodiments, the aperture 40 can also be located at other positions, which are not limited in the present application.

[0155] In this embodiment, the first lens L1 has positive refractive power, and comprises an object side S1 and an image side S2. The second lens L2 has negative refractive power, and comprises an object side S3 and an image side S4. The third lens L3 has positive refractive power, and comprises an object side S5 and an image side S6. The fourth lens L4 has positive refractive power, and comprises an object side S7 and an image side S8. The fifth lens L5 has negative refractive power, and comprises an object side S9 and an image side S10. The sixth lens L6 has positive refractive power, and comprises an object side S11 and an image side S12. The seventh lens L7 has negative refractive power, and comprises an object side S13 and an image side S14. In addition, the filter 20 is arranged behind the seventh lens L7, and comprises an object side S15 and an image side S16. An imaging surface S17 (not labeled) is located on the image side of all the lenses in the optical lens 10, and is a carrier surface on which the image formed by the light rays passing through the lenses in the optical lens 10 in sequence. Figure 13 、 Figure 14 and Figure 15 In this embodiment, the first lens L1 is made of glass, and the second lens L2 to the seventh lens L7 are made of plastic.

[0156] In this embodiment, when the camera module 200 is switched from the non-working state (storage state) to the working state (long shot state or close-up state), the first lens group G1 and the second lens group G2 move in the direction of the object side along the optical axis O, and the third lens group G3 is stationary. When the camera module 200 is switched from the working state to the non-working state, the first lens group G1 and the second lens group G2 move in the direction of the image side along the optical axis O, and the third lens group G3 is stationary. In this way, the overall size of the camera module 200 is relatively low, and does not cause the corresponding part of the electronic device 1000 to protrude.

[0157] In the embodiment, when the camera module 200 switches from the telephoto state to the close-up state, the second lens group G2 moves along the optical axis O to the image side, and the first lens group G1 and the third lens group G3 are stationary to achieve focusing.

[0158] In the embodiment, when the camera module 200 switches from the close-up state to the telephoto state, the second lens group G2 moves along the optical axis O to the object side, and the first lens group G1 and the third lens group G3 are stationary to achieve focusing.

[0159] Please refer to Table 3a, which is the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 20 of the optical lens 10 in the third embodiment in the telephoto and close-up working states. The thickness includes the thickness of the lens itself and the spacing between the lenses, and the Abbe number is the dispersion coefficient.

[0160] Table 3a

[0161] In Table 3a, 1.1344 / 4.2844 means that the spacing between the first lens group G1 and the second lens group G2 on the optical axis is 1.1344 mm when the object distance is infinity, and the spacing between the first lens group G1 and the second lens group G2 on the optical axis is 4.2844 mm when the object distance is 50 mm. 5.1655 / 2.0156 means that the spacing between the second lens group G2 and the third lens group G3 on the optical axis is 5.1655 mm when the object distance is infinity, and the spacing between the first lens group G1 and the second lens group G2 on the optical axis is 2.0156 mm when the object distance is 50 mm.

[0162] Please refer to Table 3b, which is the asphericity coefficient of each lens of the optical lens 10 in the third embodiment.

[0163] Table 3b

[0164] In the embodiment, the object side and the image side of the first lens L1 to the seventh lens L7 are aspheric surfaces, which can be defined by, but not limited to, the following aspheric surface formula:

[0165] where z is the relative distance of a point on the aspheric surface with a distance r from the optical axis to the tangent plane at the intersection point on the optical axis; r is the vertical distance of a point on the aspheric curve from the optical axis; c is the curvature; k is the conical coefficient; a i is the i-th order asphericity coefficient.

[0166] Please refer to Table 3c, which is the basic parameters of the optical lens 10 in the third embodiment. In Table 3c, f1-f7 are the focal lengths of the first lens L1 to the seventh lens L7, F1-F3 are the focal lengths of the first lens group G1 to the third lens group G3, ImgH is the maximum image height of the optical lens 10, which is half of the diagonal size of the photosensitive element, and Fno is the F-number.

[0167] Table 3c

[0168] In this embodiment, when the optical lens 10 is switched from a telephoto to a close-up, for example, to focus at a micro distance of 50 mm, the distance between the first lens group G1 and the second lens group G2 is increased from 1.1344 mm to 4.2844 mm, and the focusing stroke of the second lens group G2 is 3.15 mm. The short focusing stroke and good focusing effect can achieve good micro distance shooting effect. In this embodiment, the micro distance focusing shooting is achieved by moving the second lens group G2 to the image side, and the first lens group G1 does not move, so that the micro distance shooting can be achieved without increasing the size of the optical lens 10.

[0169] Please refer to Figure 16 , Figure 16 is a representation diagram of the optical performance of the optical lens 10 in the third embodiment when the object distance is infinity.

[0170] In which, Figure 16 includes the axial chromatic aberration curve diagram, the astigmatism field curve diagram, and the distortion diagram of the optical lens 10 when the object distance is infinity. The axial chromatic aberration curve diagram includes the spherical aberration curves corresponding to different wave bands (the diagrams include 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm); the physical meaning is that the light of the corresponding wavelength emitted at 0 degree field is deviated from the ideal image point after passing through the optical system; the abscissa is the deviation value in the optical axis direction, and the ordinate is the normalized coordinate at the pupil. Figure 16 The values in the table are small, and the on-axis aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curve diagram is used to show the deviation of the converging point of the light beam in different fields from the ideal imaging surface. The solid line S is the sagittal direction light beam, and the dashed line T is the tangential direction light beam. The abscissa is the deviation value in the optical axis direction, and the ordinate is the corresponding field. When a field value is too large, the image quality of the field is poor or there is high-order aberration. Figure 16 The two direction field curves shown are small, and the system has good focal depth. The distortion diagram is used to represent the relative deviation of the converging point (actual image height) of the light beam in different fields from the ideal image height. Figure 16 The distortion shown is within 2%, which can ensure that the picture does not have obvious deformation.

[0171] Please refer to Figure 17 ,Figure 17 is a representation of the optical performance of the optical lens 10 in the third embodiment when the object distance is 50mm.

[0172] wherein, Figure 17 includes the axial chromatic aberration curve, the field curvature curve and the distortion curve of the optical lens 10 when the object distance is 50mm. The axial chromatic aberration curve includes the spherical aberration curves corresponding to different wavebands (the curves shown include 650nm, 610nm, 555nm, 510nm and 470nm) of the system, Figure 17 The values shown in the table are small, and the on-axis aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The field curvature curve is used to show the deviation of the converging point of the light beam in different fields of view from the ideal imaging surface. The solid line S is the sagittal direction light beam, and the dashed line T is the tangential direction light beam. When the value of a certain field of view is too large, the image quality of the field of view is poor or there is high-order aberration, Figure 17 The field curvature in both directions shown is small, and the system has good depth of focus. The distortion curve is used to represent the relative deviation of the converging point (actual image height) of the light beam in different fields of view from the ideal image height, Figure 17 The distortion shown is within 5%, which can ensure that the picture is not obviously deformed.

[0173] According to Figure 16 and Figure 17 , it can be known that the optical lens 10 given in the third embodiment can achieve good imaging quality when the object distance is infinity and the object distance is 50mm in the macro mode.

[0174] Fourth Embodiment Please refer to Figure 18 , Figure 19 and Figure 20 , Figure 18 is a structural schematic diagram of a camera module 200 of the fourth embodiment of the present application, Figure 19 is a structural schematic diagram of the camera module 200 shown in Figure 18 in a working state, Figure 20 is a structural schematic diagram of the camera module 200 shown in Figure 18 in another working state. Figure 18 The camera module 200 shown is in a non-working state, Figure 19 is a telephoto working state of the camera module 200 shown in Figure 18 when the object distance is infinity, Figure 20 is a close-up working state of the camera module 200 shown in Figure 18 when the macro mode is used.

[0175] The camera module 200 comprises an optical lens 10, a filter 20 and a photosensitive element 30. In this embodiment, the optical lens 10 comprises, in order from the object side to the image side, an aperture 40, a first lens group G1, a second lens group G2 and a third lens group G3. The first lens group G1 has positive refractive power, and comprises a first lens L1, a second lens L2 and a third lens L3. The second lens group G2 has negative refractive power, and comprises a fourth lens L4, a fifth lens L5 and a sixth lens L6. The third lens group G3 has positive refractive power, and comprises a seventh lens L7. The first lens L1 to the seventh lens L7 are arranged in order from the object side to the image side. The aperture 40 is a variable aperture, and the size of the aperture can be adjusted according to requirements. The aperture 40 is located on the object side of the first lens L1. In other embodiments, the aperture 40 can also be located at other positions, which are not limited in the present application.

[0176] In this embodiment, the first lens L1 has positive refractive power, and comprises an object side S1 and an image side S2. The second lens L2 has negative refractive power, and comprises an object side S3 and an image side S4. The third lens L3 has positive refractive power, and comprises an object side S5 and an image side S6. The fourth lens L4 has negative refractive power, and comprises an object side S7 and an image side S8. The fifth lens L5 has positive refractive power, and comprises an object side S9 and an image side S10. The sixth lens L6 has negative refractive power, and comprises an object side S11 and an image side S12. The seventh lens L7 has positive refractive power, and comprises an object side S13 and an image side S14. In addition, the filter is located behind the seventh lens L7, and comprises an object side S15 and an image side S16. An imaging surface S17 (not shown) is located on the image side of all the lenses in the optical lens 10, and is a carrier surface on which the image formed by the light rays passing through the lenses in the optical lens 10 in order. Figure 18 、 Figure 19 and Figure 20 In this embodiment, the first lens L1 is made of glass, and the second lens L2 to the seventh lens L7 are made of plastic.

[0177] It should be noted that, Figure 18 、 Figure 19 and Figure 20 Part of the seventh lens L7 is an opening area, because the opening area is a non-effective area, and this non-effective area does not affect the light path. During production, the staff can manufacture the lens as a closed lens according to the mold forming conditions.

[0178] In the embodiment, when the camera module 200 is switched from the non-working state (storage state) to the working state (long shot state or close shot state), the first lens group G1 and the second lens group G2 move in the object side direction along the optical axis O, and the third lens group G3 is stationary; when the camera module 200 is switched from the working state to the non-working state, the first lens group G1 and the second lens group G2 move in the image side direction along the optical axis O, and the third lens group G3 is stationary, so that the overall size of the camera module 200 is relatively low, and does not cause the corresponding part of the electronic device 1000 to be convex.

[0179] In the embodiment, when the camera module 200 is switched from the long shot state to the close shot state, the first lens group G1 moves in the object side direction along the optical axis O, the second lens group G2 moves in the image side direction along the optical axis O, and the third lens group G3 is stationary, so as to realize focusing.

[0180] In the embodiment, when the camera module 200 is switched from the close shot state to the long shot state, the first lens group G1 moves in the image side direction along the optical axis O, the second lens group G2 moves in the object side direction along the optical axis O, and the third lens group G3 is stationary, so as to realize focusing.

[0181] Please refer to Table 4a, which is the radius of curvature, thickness, refractive index (Nd) and Abbe number of each lens and filter 20 of the optical lens 10 in the fourth embodiment in the working state of long shot and close shot. Among them, the thickness includes the thickness of the lens itself and the distance between the lenses, and the Abbe number is the dispersion coefficient.

[0182] Table 4a

[0183] In Table 4a, 0.6696 / 3.3476 means that when the object distance is infinity, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 0.6696 mm, and when the object distance is 50 mm, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 3.3476 mm. 2.3019 / 0.1443 means that when the object distance is infinity, the distance between the second lens group G2 and the third lens group G3 on the optical axis is 2.3019 mm, and when the object distance is 50 mm, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 0.1443 mm.

[0184] Please refer to Table 4b, which is the asphericity coefficient of each lens of the optical lens 10 in the fourth embodiment.

[0185] Table 4b

[0186] In the embodiment, the object side surface and the image side surface of the first lens L1 to the seventh lens L7 are aspheric surfaces, which can be defined by, but not limited to, the following aspheric surface formula:

[0187] wherein z is the relative distance of a point on the aspheric surface at a distance r from the optical axis to the tangent plane at the intersection of the optical axis with the tangent plane; r is the perpendicular distance of a point on the aspheric curve to the optical axis; c is the curvature; k is the conic constant; a i is the aspheric coefficient of the i-th order.

[0188] Please refer to Table 4c, which is the basic parameters of the optical lens 10 in the fourth embodiment. In Table 4c, f1 to f7 are the focal lengths of the first lens L1 to the seventh lens L7, respectively, F1 to F3 are the focal lengths of the first lens group G1 to the third lens group G3, respectively, ImgH is the maximum image height of the optical lens 10, which is half of the diagonal size of the photosensitive element, Fno is the F-number, and the closest object distance of the present embodiment is 50mm.

[0189] Table 4c

[0190] In the present embodiment, when the optical lens 10 is switched from a telephoto to a close-up, for example, to focus at a micro distance of 50mm, the distance between the first lens group G1 and the second lens group G2 is reduced from 2.3019mm to 0.1443mm, and the focusing stroke of the second lens group G2 is 2.1576mm. The short focusing stroke and good focusing effect can achieve good micro distance shooting effect. In the present embodiment, when the optical lens 10 is switched from a telephoto to a close-up, both the first lens group G1 and the second lens group G2 are moved, which increases more degrees of freedom, is conducive to compensating for the image plane drift caused by the object plane change during micro distance focusing, and the micro distance focusing effect is better.

[0191] Please refer to Figure 21 , Figure 21 is a representation diagram of the optical performance of the optical lens 10 in the fourth embodiment when the object distance is infinity.

[0192] wherein, Figure 21 includes the axial chromatic aberration curve diagram, the astigmatism field curve diagram and the distortion diagram of the optical lens 10 when the object distance is infinity. The axial chromatic aberration curve diagram includes the spherical aberration curve corresponding to different wave bands (the diagrams shown include 650nm, 610nm, 555nm, 510nm and 470nm) of the system; the physical meaning is that the light of the corresponding wavelength emitted at 0 degree field of view is deviated from the ideal image point after passing through the optical system; the abscissa is the deviation value in the optical axis direction, and the ordinate is the normalized coordinate at the pupil. Figure 21The axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected, and the values of the two directions are small. The astigmatic field curve is used to show the deviation of the fine light beam convergence point of different fields of view from the ideal imaging surface. The solid line S is the sagittal direction light beam, and the dashed line T is the meridional direction light beam. The abscissa is the deviation value in the optical axis direction, and the ordinate is the corresponding field of view. When the field of view value is too large, the image quality of the field of view is poor or there is high-order aberration. Figure 21 The two direction field curves shown are small, and the system has good focal depth. The distortion graph is used to represent the relative deviation of the light beam convergence point (actual image height) of different fields of view from the ideal image height. Figure 21 The distortion shown is within 3%, which can ensure that the picture does not have obvious deformation.

[0193] Please refer to Figure 22 , Figure 22 is a representation graph of the optical performance of the optical lens 10 in the fourth embodiment when the object distance is 50mm.

[0194] Among them, Figure 22 includes the axial chromatic aberration curve, the astigmatic field curve and the distortion graph of the optical lens 10 when the object distance is 50mm. The axial chromatic aberration curve includes the spherical aberration curve corresponding to different wave bands (the graph shown includes 650nm, 610nm, 555nm, 510nm and 470nm), Figure 22 The axial aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected, and the values of the two directions are small. The astigmatic field curve is used to show the deviation of the fine light beam convergence point of different fields of view from the ideal imaging surface. The solid line S is the sagittal direction light beam, and the dashed line T is the meridional direction light beam. When the field of view value is too large, the image quality of the field of view is poor or there is high-order aberration, Figure 22 The two direction field curves shown are small, and the system has good focal depth. The distortion graph is used to represent the relative deviation of the light beam convergence point (actual image height) of different fields of view from the ideal image height, Figure 22 The distortion shown is within 8%, which can ensure that the picture does not have obvious deformation.

[0195] According to Figure 21 and Figure 22 It can be known that the optical lens 10 given in the fourth embodiment can achieve good imaging quality when the object distance is infinity and the object distance is 50mm in the micro distance.

[0196] In other embodiments, when the camera module 200 is switched from the long shot state to the close-up state, the third lens group G3 can also move towards the object side or the image side.

[0197] In other embodiments, when the camera module 200 is switched from the close-up state to the long shot state, the third lens group G3 can also move towards the object side or the image side.

[0198] In the focusing process of switching the optical lens 10 from the far view to the close view, the second lens group G2 can move to the image side, or the first lens group G1 moves to the object side, or the first lens group G1 moves to the object side and the second lens group G2 can move to the image side, so as to increase the distance between the first lens group G1 and the second lens group G2, and realize the effect of macro focusing. The optical lens 10 has the characteristics of long focal length, large target surface, macro and large light aperture, and can realize miniaturization.

[0199] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; 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 case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

Claims

1. An optical lens, characterized in that, The system includes a first lens group and a second lens group arranged from the object side to the image side. The first lens group has positive optical power. The first lens group includes a first lens, a second lens, and a third lens arranged from the object side to the image side. The first lens has positive optical power, the second lens has negative optical power, the third lens has positive optical power, and the second lens group has negative optical power. The first lens group and / or the second lens group are focusing lens groups. During the focusing process of the optical lens from a distant scene to a close-up scene, the distance between the first lens group and the second lens group increases, and the effective focal length of the optical lens decreases; the optical lens satisfies the following relationship: -0.5022≥F2 / EFL≥-1.5, F1 / EFL≤1, 1mm≤φ1≤10mm, F2 is the focal length of the second lens group, EFL is the effective focal length of the optical lens, F1 is the focal length of the first lens group, and φ1 is the maximum effective area diameter of the first lens group.

2. The optical lens according to claim 1, characterized in that, During the focusing process of the optical lens switching from a distant view to a close view, the first lens group moves along the optical axis to the object side and / or the second lens group moves along the optical axis to the image side.

3. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following relationship: 0.5 ≤ TTL / EFL ≤ 1, or 1 < TTL / EFL ≤ 2. When TTL is in working state, the distance on the optical axis from the object side of the first lens of the first lens group to the imaging surface.

4. The optical lens according to claim 1 or 2, characterized in that, The first lens group includes at least two lenses, and the at least two lenses have different Abbe numbers.

5. The optical lens according to claim 1 or 2, characterized in that, The first lens group includes a first lens, and the optical lens satisfies the following relationship: Vd1≥18, Vd1 is the Abbe number of the first lens.

6. The optical lens according to claim 1 or 2, characterized in that, At least one lens in the first lens group is made of glass.

7. The optical lens according to claim 1 or 2, characterized in that, The first lens group includes a first lens, and the near-optical axis region of the object side of the first lens is convex.

8. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following relationship: 1mm≤φ2≤20mm φ2 is the maximum effective area diameter of the second lens group.

9. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following relationship: 0.3mm≤h1≤50mm, h1 is the maximum pop-out height of the first lens group, which refers to the maximum distance the first lens group moves when the optical lens switches from a non-working state to a working state.

10. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following relationship: 0.3mm ≤ h2 ≤ 2.2432, or 2.2432 < h2 ≤ 50mm. h2 is the maximum pop-out height of the second lens group, which refers to the maximum distance the second lens group moves when the optical lens switches from a non-working state to a working state.

11. The optical lens according to claim 1 or 2, characterized in that, The optical lens includes a variable aperture, the size of which decreases during the focusing process of the optical lens switching from a distant scene to a close-up scene.

12. The optical lens according to claim 1 or 2, characterized in that, The optical lens satisfies the following relationship: 0.5≤Fno≤4, Fno is the aperture number of the optical lens.

13. The optical lens according to claim 1 or 2, characterized in that, The optical lens includes a third lens group located on the image side of the second lens group, and the third lens group has optical power.

14. The optical lens according to claim 13, characterized in that, The optical lens satisfies the following relationship: 5mm ≤ ox1 + ox2 + ox3 ≤ 10mm, or 10mm < ox1 + ox2 + ox3 ≤ 30mm. ox1 is the thickness of the first lens group on the optical axis, ox2 is the thickness of the second lens group on the optical axis, and ox3 is the thickness of the third lens group on the optical axis.

15. The optical lens according to claim 13, characterized in that, At least one lens in the third lens group has an aspherical optical surface.

16. The optical lens according to claim 1 or 2, characterized in that, The optical lens includes a liquid lens and / or a liquid crystal lens, wherein the liquid lens and / or the liquid crystal lens is located in the first lens group.

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

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

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