Optical lens, camera module and electronic device

Abstract

The application discloses an optical lens, a camera module and an electronic device. 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 positive refractive power, the second lens group has negative refractive power, and the first lens group and / or the second lens group is a focusing lens group. In the focusing process of switching the optical lens from a long shot to a close shot, 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 relationship F2 / EFL >-5, wherein F2 is the focal length of the second lens group, and EFL is the effective focal length of the optical lens. The optical lens has the characteristics of long focal length, micro distance and large aperture, and can be miniaturized.

Description

[0001] This application claims priority to the Chinese Patent Application No. 202210288243.4, filed on March 23, 2022, and entitled "Optical Lens, Camera Module and Electronic Device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] 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

[0003] Portable electronic products are increasingly widely used, and camera modules are typical electronic device components. In a combined optical lens with multiple cameras, a long-focus lens design is indispensable. Long-focus lenses have become a development trend of camera modules for electronic products.

[0004] In order to improve the shooting experience, it is generally desirable for an optical lens to have a larger photosensitive element, a smaller F number (a larger light aperture), and a closer long-focus macro. However, in an earlier upright design, as the focal length increases, the size of the optical lens increases dramatically, but the size of portable terminal devices is limited, and it is difficult to achieve macro shooting.

[0005] Therefore, it is necessary to provide an optical lens that has long-focus, macro, large light aperture, and is miniaturized. SUMMARY

[0006] 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 be miniaturized.

[0007] 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 focusing of the optical lens from a long shot to a close shot, 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 being the 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 the 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 macro, the focal length of the optical lens decreases.

[0008] The present application limits the focal 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 be miniaturized. Specifically, the first lens group has positive focal 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 focal power, which is beneficial to realize long focal length design and is used for focusing and macro focusing, has small focusing stroke and strong focusing ability. By limiting F2 / EFL>-5, the second lens group 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 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 with a distance between infinity and 20mm, wherein the optical lens of the present application has small focusing stroke and high imaging quality when shooting objects with a distance between 20mm and 50mm.

[0009] In a possible implementation, in the focusing process of switching the optical lens from long distance to close distance, the first lens group moves towards the object side along the optical axis and / or the second lens group moves towards the image side along the optical axis. In the focusing process of switching the optical lens from long distance to close distance, the second lens group can move towards the image side, or the first lens group moves towards the object side, or the first lens group moves towards the object side and the second lens group can move towards 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 macro shooting.

[0010] 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.

[0011] 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 appropriate range of F1 / EFL, the focal power of the first lens group can be reasonably configured, the aperture number is reduced, the design of large aperture is facilitated, the light aperture is increased, and good imaging quality can be ensured.

[0012] In a possible implementation, the first lens group includes at least two lenses, and Abbe numbers of the at least two lenses are different. 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 chromatic aberration on image quality is reduced.

[0013] In a possible implementation, the first lens group includes a first lens, a second lens and a third lens arranged from an object side to an image side, the first lens has a positive focal power, the second lens has a negative focal power, and the third lens has a positive focal power. In this implementation, by reasonably configuring the focal powers of the first lens, the second lens and the third lens, a large-aperture design is facilitated, the aperture is increased, and good imaging quality is ensured.

[0014] In a possible implementation, the first lens group includes a first lens, and the optical lens satisfies the following relationship: Vd1≥18, where Vd1 is the Abbe number of the first lens. For example, the Abbe number of the first lens can be 40 or 50. By limiting the Abbe number of the first lens to be greater than 18, it is ensured that the first lens group has a large Abbe number, and in this case, the optical lens can ensure that no excessive residual chromatic aberration is generated, and the design difficulty of the lens group located on the image side of the first lens group is reduced.

[0015] 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 imaging quality, reducing 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 used. The lens made of glass is beneficial to improving imaging quality and reducing chromatic aberration and temperature drift effect, and the lens made of plastic can reduce the weight and cost of the optical lens.

[0016] In a possible implementation, the first lens group includes a first lens, and a region close to an optical axis of an object side surface of the first lens is a convex surface, which is beneficial to converging a light beam. The region close to the optical axis of the object side surface of the first lens refers to a region of 1 / 50 of the aperture height of the object side surface of the first lens.

[0017] In a possible implementation, the optical lens satisfies the following relationship: D1 is the maximum effective diameter of the first lens group. The greater the maximum effective diameter of the first lens group, the greater the target surface size of the optical lens, so that the optical lens has a large target surface feature, which is beneficial to increasing the clarity of imaging and improving imaging quality.

[0018] In a possible implementation, the optical lens satisfies the following relationship: The maximum effective region diameter of the second lens group is greater, the target surface size of the optical lens can be greater, the optical lens has the characteristics of a large target surface, which is beneficial to increasing the clarity of imaging and improving the imaging quality.

[0019] 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, and the maximum pop-up height of the first lens group refers to the maximum distance that the first lens group moves when the optical lens is switched from an inactive state to an active state. In the implementation of the present application, the maximum pop-up height of the first lens group is small, that is, the displacement of the first lens group is small, which reduces the power requirement of the motor, reduces the volume of the motor used to drive the movement of the first lens group, and makes the camera module more easily miniaturized.

[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, and the maximum pop-up height of the first lens group refers to the maximum distance that the first lens group moves when the optical lens is switched from an inactive state to an active state. In the implementation of the present application, the maximum pop-up height of the first lens group is small, that is, the displacement of the first lens group is small, which reduces the power requirement of the motor, reduces the volume of the motor used to drive the movement of the first lens group, and makes the camera module more easily miniaturized.

[0021] In a possible implementation, the optical lens includes 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-up. When shooting a long shot, 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 beneficial to long shot shooting. When shooting a close-up, it is not suitable to use the blurring effect in order to improve the clarity of shooting, and therefore the variable aperture needs to be adjusted to be small to improve the quality of close-up shooting.

[0022] In a possible implementation, the optical lens satisfies the following relationship: 0.5≤Fno≤8, where Fno is the aperture number of the optical lens. Fno is small, and the aperture is large. Fno is large, and the aperture is small. When shooting a long shot, the Fno can be reduced by adjusting the variable aperture to obtain a large aperture, and the blurring effect is good, which is beneficial to long shot shooting. When shooting a close-up, the Fno is increased, and the aperture is reduced to improve the quality of close-up shooting.

[0023] In a possible implementation, the optical lens comprises a third lens group, the third lens group is 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, at this time, the third lens group functions as a flat field mirror, 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 is from infinity to a limited distance, and the imaging quality of the camera module is higher. In other implementations, the third lens group has positive optical power, which matches the special structural requirements of the different moving directions of the second lens group in the automatic focusing process.

[0024] In a possible implementation, the optical lens satisfies the following relationship: 5mm≤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. 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 type as an example, the present application limits ox1+ox2+ox3≤30mm to ensure that the optical lens has a small size when being stored, avoids the optical lens part being protruding, and affects the weight and appearance. By limiting ox1+ox2+ox3≥5mm, the optical lens has the characteristics of a large target surface, which is beneficial to increasing the clarity of imaging and improving the imaging quality.

[0025] In a possible implementation, the optical surface of at least one lens in the third lens group is aspherical. In this way, different optical powers are provided from the paraxial region to the outer field region, so that the imaging picture has more balanced quality, aberrations are corrected, and the imaging quality is improved.

[0026] In a possible implementation, the optical lens comprises 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. In this implementation, the focusing effect can be enhanced by the liquid lens or the liquid crystal lens to realize ultra-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.

[0027] 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.

[0028] 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 implementation of the present application limits the range of ImgH, so that the optical lens has the characteristic of a large target surface.

[0029] 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.

[0030] In a possible implementation, the object distance range of the optical lens is from infinity to 20mm, and the optical lens of the present application can clearly image within the object distance range from infinity to 20mm.

[0031] In a possible implementation, the focusing stroke of the second lens group is less than or equal to 50mm.

[0032] In a second aspect, the present application further provides a camera module, including a photosensitive element and the optical lens of any one of the above, and the photosensitive element is located on the image side of the optical lens. The camera module has the characteristics of long focal length, macro, and large aperture, and can be miniaturized.

[0033] In a third aspect, the present application further provides an electronic device, including an image processor and the camera module, the image processor is in communication connection with the camera module, and the image processor is used to acquire image data from the camera module and process the image data. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a schematic diagram of an electronic device provided by an embodiment of the present application;

[0035] Figure 2 is a structural schematic diagram of a camera module of a first embodiment of the present application;

[0036] Figure 3 is Figure 2 is a structural schematic diagram of the camera module shown in FIG. 8 in a working state;

[0037] Figure 4 is Figure 2 is a structural schematic diagram of the camera module shown in FIG. 8 in another working state;

[0038] Figure 5This is a simplified structural diagram of an optical lens in different states according to one embodiment of this application;

[0039] Figure 6 This is a characterization diagram of the optical performance of the optical lens in the first embodiment at an object distance of infinity;

[0040] Figure 7 This is a characterization diagram of the optical performance of the optical lens in the first embodiment at an object distance of 50mm;

[0041] Figure 8 This is a schematic diagram of the structure of the camera module according to the second embodiment of this application;

[0042] Figure 9 yes Figure 8 The diagram shows the structure of the camera module in one working state.

[0043] Figure 10 yes Figure 8 The diagram shows the structure of the camera module in another working state.

[0044] Figure 11 This is a characterization diagram of the optical performance of the optical lens in the second embodiment at an object distance of infinity;

[0045] Figure 12 This is a characterization diagram of the optical performance of the optical lens in the second embodiment at an object distance of 50mm;

[0046] Figure 13 This is a schematic diagram of the structure of the camera module according to the third embodiment of this application;

[0047] Figure 14 yes Figure 13 The diagram shows the structure of the camera module in one working state.

[0048] Figure 15 yes Figure 13 The diagram shows the structure of the camera module in another working state.

[0049] Figure 16 This is a characterization diagram of the optical performance of the optical lens in the third embodiment at an object distance of infinity;

[0050] Figure 17 This is a characterization diagram of the optical performance of the optical lens in the third embodiment at an object distance of 50mm;

[0051] Figure 18 This is a schematic diagram of the structure of the camera module according to the fourth embodiment of this application;

[0052] Figure 19 yes Figure 18A structural schematic diagram of the camera module in a working state is shown.

[0053] Figure 20 is Figure 18 A structural schematic diagram of the camera module in another working state is shown.

[0054] Figure 21 is a representation of the optical performance of the optical lens in the fourth embodiment when the object distance is infinite.

[0055] 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

[0056] 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.

[0057] Focal power, equal to the difference between the convergence degree of the image-side beam and the convergence degree of the object-side beam, represents the ability of the optical system to deflect light.

[0058] Lens or lens group with positive focal power, which has a positive focal length and has the effect of converging light.

[0059] Lens or lens group with negative focal power, which has a negative focal length and has the effect of diverging light.

[0060] 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.

[0061] Object side, bounded by the lens, is the side where the object to be imaged is located.

[0062] Image side, bounded by the lens, is the side where the image of the object to be imaged is located.

[0063] Object side surface, bounded by the lens, is 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.

[0064] Image side surface, bounded by the lens, is 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.

[0065] Imaging surface, located on the image side of all lenses in the optical lens, and the carrier surface on which the image is formed after the light passes through each lens in the optical lens in turn.

[0066] Aperture, which is used to control the amount of light passing through the lens into the body of the light-sensitive surface, is usually in the lens.

[0067] F-number, also known as F-number (Fno), is the 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 aperture value, the more light will be admitted in the same unit of time. The larger the aperture value, the smaller the depth of field, and the background content of the photograph will be blurred, similar to the effect of a long focal length lens.

[0068] Abbe number (Abbe), i.e. dispersion coefficient, is the ratio of the difference in refractive index of optical materials at different wavelengths, representing the degree of material dispersion.

[0069] Field of view (FOV), in optical instruments, 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, is called the field of view. 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.

[0070] 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, but 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.

[0071] Optical axis is a light ray perpendicular to the center of an ideal lens. When light rays parallel to the optical axis enter a convex lens, the ideal convex lens should converge all light rays to a point behind the lens, and this point where all light rays converge is called the focal point. When light propagates along the optical axis, its transmission direction does not change.

[0072] Longitudinal spherical aberration, also known as longitudinal chromatic aberration or position chromatic aberration or axial aberration, a bundle of light rays parallel to the optical axis will converge at different positions before and after passing through the lens. This aberration is called position chromatic aberration or axial aberration. This is because the lens images different wavelengths of light at different positions, so that the image plane of different colors cannot coincide when imaging, and the dispersion of complex color light is formed.

[0073] Distortion, also called as aberration, is the degree of distortion of the image of an object formed by an optical system relative to the object itself. Distortion is due to the effect of the stop spherical aberration, the intersection height of the chief ray of different fields after passing through the optical system is not equal to the ideal image height, and the difference between the two is the distortion. Therefore, distortion only changes the imaging position of the off-axis object point on the ideal surface, which causes the shape of the image to be distorted, but does not affect the sharpness of the image.

[0074] Astigmatism is that the light beam emitted by the object point is inclined to the optical axis of the optical system. After the light beam is refracted by the lens, the convergence points of the meridional pencil and the sagittal pencil are not on the same point. That is, the light beam cannot be focused on a point, and the image is not clear, so astigmatism is generated. The meridional pencil and the sagittal pencil are the names of the light beams in two perpendicular planes in a rotationally symmetric optical system.

[0075] Curvature of field is used to represent the difference between the position of the most clear image point of the non-central field light after passing through the optical lens group and the position of the most clear image point of the central field on the optical axis. When the lens has field curvature, the intersection point of the entire light beam does not coincide with the ideal image point, although a clear image point can be obtained at each specific point, but the entire image plane is a curved surface.

[0076] 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.

[0077] The application provides an optical lens, a camera module using the optical lens, and an electronic device including the camera module. The optical lens includes a first lens group and a second lens group arranged from an object side to an image side, the first lens group has positive refractive power, the second lens group has negative refractive power, and the first lens group and / or the second lens group is a focusing lens group. During a focusing process of the optical lens from a long shot to a close shot, 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, and EFL is the effective focal length of the optical lens. By limiting the refractive power of the first lens group and the second lens group and limiting F2 / EFL>-5, the optical lens has the characteristics of long focal length, macro, 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 long focal length design and is used for focusing and macro focusing. By limiting F2 / EFL>-5, the second lens group can have a large enough refractive power, the focusing stroke can be reduced, the focusing ability is strong, and the image quality is good when shooting objects at different distances. The optical lens of the application can not only be used for long shot shooting, but also can be used for close shot macro shooting, and the optical lens of the application has good shooting effect on objects with a distance between infinity and 20mm.

[0078] The application provides an electronic device, which can be a mobile phone, a tablet computer, a laptop computer, a wearable device, or the like, and has a photographing or video shooting function. Figure 1 , Figure 1 As shown in FIG. 1, the electronic device 1000 is a mobile phone in this embodiment. The application takes the mobile phone as an example for description.

[0079] 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 configured to acquire image data and input the image data to the image processor 300, and the image processor 300 is configured 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 can be achieved 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.

[0080] 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.).

[0081] In a specific embodiment, the camera module 200 can be arranged on the back of the electronic device 1000, and the camera module 200 serves as a 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 a 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.

[0082] It can be understood that, Figure 1 The mounting position of the camera module 200 of the electronic device 1000 in the illustrated embodiment 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.

[0083] 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). An 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. The image processor 300 then processes the digital image signal and finally displays the image or video on the display.

[0084] In some embodiments, the electronic device 1000 may 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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 2The image shows the close-up working state of the camera module during macro shooting at 200.

[0090] 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.

[0091] The first lens group G1 and / or the second lens group G2 are focusing lens groups. Exemplarily, during focusing, only the first lens group G1 can move along the optical axis O for focusing, only the second lens group G2 can move along the optical axis O for focusing, or both the first lens group G1 and the second lens group G2 can move along the optical axis O for focusing. During the focusing process of the optical lens 10 from a distant view to a close-up view, 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 at a macro distance is less than the focal length at an infinity distance. During the focusing process of the optical lens 10 from a distant view to a close-up view, the second lens group G2 can move towards the image side along the optical axis O, or the first lens group G1 can move towards the object side along the optical axis O, or the first lens group G1 can move towards the object side along the optical axis O and the second lens group G2 can move towards the image side along the optical axis O, to increase the distance between the first lens group G1 and the second lens group G2, achieving a macro focusing effect.

[0092] The optical lens 10 satisfies the relationship: F2 / EFL > -5, where F2 is the focal length of the second lens group G2, and EFL is the effective focal length of the optical lens 10. For example, the value of F2 / EFL can be -1, -1.5, -2, -3, or -4, etc.

[0093] It should be noted that when the object distance is at infinity, the optical lens 10 of this application is a fixed focal length lens. When the object distance is switched from infinity to macro, the focal length of the optical lens 10 becomes smaller.

[0094] This application, by limiting the optical power of the first lens group G1 and the second lens group G2 and limiting F2 / EFL > -5, enables the optical lens 10 to possess the characteristics of telephoto, macro, and large aperture, while also achieving miniaturization. The first lens group G1 has a positive optical power and is used for beam converging, resulting in a smaller diameter of the beam entering the second lens group G2. The aperture of the second lens group G2 is no longer a maximum limitation on the aperture size, which is beneficial for the miniaturization and large aperture design of the optical lens 10, effectively increasing the aperture size and achieving a smaller aperture number. The second lens group G2 has a negative optical power, which is beneficial for achieving a telephoto design and for enabling focusing and macro focusing. It has a short focusing throw and strong focusing capability. By limiting F2 / EFL > -5, it is ensured that the second lens group G2 has a sufficiently large optical power, reducing the focusing throw, resulting in strong focusing capability, good image quality, and high image sharpness when shooting objects at different distances. The optical lens 10 with telephoto capabilities has a shallow depth of field, and the optical lens 10 with a large aperture also has a shallow depth of field, which is beneficial for achieving a background blur effect when the object distance is large. The optical lens 10 of this application can not only perform long-distance shooting, but also close-up macro shooting. The optical lens 10 of this application has good shooting effect on subjects with an object distance of infinity to 20mm. Among them, when performing macro shooting on objects with an object distance of 20mm to 50mm, the optical lens 10 of this application has a short focusing distance and high image quality.

[0095] According to applied optics theory, when two lens groups with focal lengths Fa and Fb are arranged at an interval 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 this 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 when the first lens group G1 moves towards the object side, the interval d between the first lens group G1 and the second lens group G2 increases. Therefore, the combined focal length of the first lens group G1 and the second lens group G2 decreases. Thus, in this embodiment, when the second lens group G2 moves towards the image side, or when 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 tends to decrease, which is beneficial for achieving macro photography.

[0096] In the embodiments of this application, a reasonable configuration of the F2 value helps to compensate for image plane drift caused by changes in the object plane during macro focusing with a small displacement, thereby indirectly suppressing the aberration deterioration caused by focusing.

[0097] In some embodiments, the optical lens 10 includes 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 optical power and includes at least one lens with optical power. During focusing, the position of the third lens group G3 can remain unchanged, or it can move along the optical axis O. The third lens group G3 is used to correct field curvature and improve the imaging quality of the optical lens 10. For example, the third lens group G3 can have negative optical power. In this case, the third lens group G3 acts as a field-planing lens, which can compensate for some of the field curvature changes caused by focusing, thereby greatly enhancing the focusing capability of the second lens group G2. This results in a stronger focusing capability of the optical lens 10 and also helps to achieve uniform image quality from infinity to finite distance, leading to higher imaging quality of the camera module 200. In other embodiments, when the third lens group G3 has positive optical power, it is to match the special structural requirements such as different movement directions of the second lens group G2 during autofocus.

[0098] See also Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 5 This is a simplified structural diagram showing the optical lens in different states. When the camera module 200 switches from a non-operating state (stored state) to an operating state (far-view state or near-view state), the first lens group G1 and the second lens group G2 move along the optical axis O towards the object side, while the third lens group G3 remains stationary. When the camera module 200 switches from an operating state to a non-operating state, the first lens group G1 and the second lens group G2 move along the optical axis O towards the image side, while the third lens group G3 remains stationary. In other embodiments, the third lens group G3 may also move towards either the object side or the image side.

[0099] When the camera module 200 switches from a distant view to a close-up view, the second lens group G2 moves along the optical axis O towards the image side, while the first lens group G1 and the third lens group G3 remain stationary to achieve focusing. In other embodiments, when the camera module 200 switches from a distant view to a close-up view, the first lens group G1 may also move along the optical axis O towards the object side, and the third lens group G3 may also move along the optical axis O towards either the object side or the image side.

[0100] When the camera module 200 switches from a near-field state to a far-field state, the second lens group G2 moves along the optical axis O towards the object side, while the first lens group G1 and the third lens group G3 remain stationary to achieve focusing. In other embodiments, if the first lens group G1 moves along the optical axis O towards the object side when the camera module 200 switches from a far-field state to a near-field state, then when the camera module 200 switches from a near-field state to a far-field state, the first lens group G1 may also move along the optical axis O towards the image side. The third lens group G3 may move along the optical axis O towards the object side or the image side, or it may remain stationary.

[0101] In some embodiments, the first lens group G1 includes at least two lenses, and the at least two lenses in the first lens group G1 have different Abbe numbers. Exemplarily, the first lens group G1 includes a first lens, a second lens, and a third lens, and the first lens, the second lens, and the third lens each have different Abbe numbers. Chromatic aberration correction requires lenses with different Abbe numbers; therefore, by setting the Abbe numbers of the different lenses in the first lens group G1 to be different, the impact of chromatic aberration on image quality is reduced. In other embodiments, the different lenses in the first lens group G1 may have the same Abbe number, or some lenses may have the same Abbe number while others have different Abbe numbers; this application does not limit this.

[0102] In some embodiments, the optical lens 10 satisfies: Vd1 ≥ 18, where 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, a larger Abbe number is ensured for the first lens group G1. In this case, the first lens group G1 can ensure that excessive residual chromatic aberration is not generated, reducing the design difficulty of the lens group located on its image side.

[0103] In some embodiments, the second lens group G2 includes at least two lenses with different Abbe numbers to correct chromatic aberration and improve image quality. In other embodiments, the different lenses in the second lens group G2 may have the same Abbe number, or some lenses may have the same Abbe number while others have different Abbe numbers; this application does not limit this.

[0104] In some embodiments, at least one lens in the first lens group G1 is made of glass. Glass lenses are beneficial for improving image quality, reducing chromatic aberration and temperature drift effects in the optical lens 10, and avoiding the influence of temperature changes on the focal length of the optical lens 10. Understandably, 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 of them can be made of plastic, or a combination of both. Glass lenses are beneficial for improving image quality and reducing chromatic aberration and temperature drift effects, while plastic lenses can reduce the weight and cost of the optical lens 10.

[0105] In some embodiments, the first lens group G1 includes a first lens L1. The near-optical axis region of the object-side surface of the first lens is convex, which is beneficial for converging the light beam. This results in a smaller diameter of the light beam entering the second lens group G2, thereby effectively increasing the aperture of the optical lens 10 while maintaining the module size. The optical lens 10 has a smaller aperture value. The near-optical axis region of the object-side surface of the first lens L1 refers to 1 / 50 of the aperture height of the object-side surface of the first lens L1. The object-side surface of the first lens L1 can be spherical, which helps reduce manufacturing difficulty; it can also be aspherical, increasing design freedom and improving image quality.

[0106] 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 positive optical power, the second lens L2 has negative optical power, and the third lens L3 has positive optical power. In this embodiment, the reasonable configuration of the optical power of the first lens L1, the second lens L2, and the third lens L3 is beneficial for the design of a large aperture, increases the light transmission diameter, and ensures good image quality.

[0107] In some embodiments, the optical lens 10 satisfies: 0.5 ≤ TTL / EFL ≤ 5, where TTL is the distance along the optical axis from the object side of the first lens in the first lens group to the imaging plane when 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. Limiting the range of TTL / EFL is beneficial for miniaturization of the optical lens 10.

[0108] In some embodiments, the optical lens 10 satisfies the condition that F1 / EFL ≤ 5, where 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 optical power of the first lens group G1 can be reasonably configured, the aperture number can be reduced, which is beneficial for large aperture design, increases the light transmission diameter, and ensures good image quality.

[0109] In some embodiments, the optical lens 10 satisfies: This is the maximum effective area diameter of the first lens group G1. For example, The value 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, giving the optical lens 10 the characteristics of a large target surface, which is beneficial to increasing the sharpness of the image and improving the image quality.

[0110] In some embodiments, the optical lens 10 satisfies: This is the maximum effective area diameter of the second lens group G2. For example, The value can be 4mm, 10mm, 20mm, 22mm, or 25mm, etc. The larger the maximum effective area diameter of the second lens group G2, the larger the target surface size of the optical lens 10 can be, giving the optical lens 10 the characteristics of a large target surface, which is beneficial to increasing the sharpness of the image and improving the image quality.

[0111] 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. The maximum pop-up height of the first lens group G1 refers to the maximum distance the first lens group G1 moves when the optical lens 10 switches from a non-working state to a working state. For example, the value of h1 can be 1mm, 10mm, 20mm, 30mm, or 40mm, etc. In the embodiments of this application, the maximum pop-up height of the first lens group G1 is small, that is, the displacement of the first lens group G1 is small. This reduces the power requirement of the motor, reduces the size of the motor used to drive the movement of the first lens group, and makes it easier to miniaturize the camera module 200.

[0112] 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. The maximum pop-up height of the second lens group G2 refers to the maximum distance the second lens group G2 moves when the optical lens 10 switches from a non-working state to a working state. For example, the value of h2 can be 1mm, 10mm, 20mm, 30mm, or 40mm, etc. In the embodiments of this application, the maximum pop-up height of the second lens group G2 is small, that is, the displacement of the second lens group is small. This reduces the power requirement of the motor, decreases the size of the motor used to drive the movement of the second lens group G2, and makes it easier to miniaturize the camera module 200.

[0113] In some embodiments, the object distance range of the optical lens 10 is from infinity to 20mm. The optical lens 10 of this application can produce clear images within the object distance range of infinity to 20mm. It should be noted that in this application, infinity means an object distance greater than or equal to 2500mm, and macro means an object distance less than or equal to 200mm. For example, this application can achieve macro photography with an object distance of 50mm or 20mm.

[0114] In some embodiments, the focusing stroke of the second lens group G2 is less than or equal to 50mm. If the focusing stroke of the second lens group G2 is greater than 50mm, the power requirement of the motor is high. In the embodiments of this application, by limiting the focusing stroke of the second lens group G2 to less than or equal to 50mm, the power requirement of the motor is low.

[0115] In some embodiments, the optical lens 10 includes a variable aperture, the size of which decreases during the focusing process of the optical lens 10 from a distant view to a close-up view. When shooting distant scenes, the variable aperture can be adjusted to increase the aperture size, resulting in a shallow depth of field and good bokeh, which is beneficial for distant shots. In macro photography, to improve image sharpness, a bokeh effect is not advisable; therefore, the variable aperture needs to be reduced to increase the depth of field and improve the quality of macro photography.

[0116] 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. This application does not limit this.

[0117] The variable aperture can be a spacer structure or a variable fan blade structure; alternatively, it can be achieved through a surface coating process, such as coating a light-shielding material onto the lens to form the variable aperture. The position of the variable aperture can be fixed or variable. For example, the position of the variable aperture can be adjusted according to focusing conditions to be located between different lenses.

[0118] In some embodiments, the optical lens 10 satisfies the relationship: 0.5 ≤ Fno ≤ 8, where Fno is the aperture number of the optical lens 10. A smaller Fno corresponds to a larger aperture, and vice versa. For example, the value of Fno can be 0.8, 1.6, 1.8, 2.4, or 4, etc. When shooting distant scenes, adjusting the variable aperture can decrease Fno to obtain a larger aperture, resulting in better bokeh, which is beneficial for distant scenes. When shooting macro scenes, increasing Fno and decreasing the aperture can improve the quality of macro photography.

[0119] In some embodiments, the optical lens 10 satisfies the relationship: 5mm ≤ ox1 + ox2 + ox3 ≤ 30mm, where 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 this application can be used in pop-up camera modules or periscope camera modules. Taking a pop-up camera as an example, this application's implementation limits ox1 + ox2 + ox3 ≤ 30mm to ensure that the optical lens 10 has a small size when stored, avoiding protrusion of the optical lens 10, which would affect weight and appearance. By limiting ox1 + ox2 + ox3 ≥ 5mm, the optical lens 10 has a large target surface, which is beneficial for increasing image clarity and improving image quality.

[0120] In some embodiments, the optical surface of at least one lens in the third lens group is aspherical. This results in different optical powers from the paraxial region to the outer field of view, thereby achieving more uniform image quality, correcting aberrations, and improving image quality. And / or, the optical surface of at least one lens of the optical lens 10 can be a freeform surface to correct aberrations. Wherein, the aspherical surface is a surface that is rotationally symmetrical about the optical axis O; the freeform surface may have no axis of symmetry, or it may be symmetrical along a certain direction, or symmetrical along two directions.

[0121] In some embodiments, the optical lens 10 includes a liquid lens and / or a liquid crystal lens, which 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. The liquid lens is a structural component that uses liquid as a lens and changes the focal length by altering the curvature of the liquid. In other embodiments, the liquid lens or liquid crystal lens may also be located in the second lens group G2.

[0122] In some embodiments, the optical lens 10 includes a diffraction element located in the first lens group. In this embodiment, the diffraction element is used to reduce chromatic aberration and decrease the size of the optical lens, thereby improving the imaging quality of the optical lens 10 and achieving miniaturization of the optical lens 10.

[0123] In some embodiments, at least one lens of the optical lens 10 can employ a non-circular shape technique to reduce the size of the optical lens 10. For example, at least one lens in the first lens group G1 can have a notch for reducing the height of the lens. The notch can be implemented using an I-CUT process. By providing a notch for reducing the height of the lens on at least one lens of the first lens group G1, the size of the optical lens 10 in the height direction can be effectively reduced, making the optical lens 10 more suitable for miniaturized electronic devices and increasing the applicability of the optical lens 10. In addition, since the lens reduces its height by a notch, the lens can have a larger light-transmitting aperture, thereby increasing the light transmission of the optical lens 10 and resulting in better image quality. Furthermore, non-circular shape techniques can also be used on the structural support components of the lens, such as the lens barrel and spacers, to reduce the size of the optical lens.

[0124] In some embodiments, the peripheral surface or support surface of at least one lens of the optical lens 10 may be blackened or roughened to eliminate stray light and improve image quality. Blackening may involve coating or plating with a matte material such as black ink, or applying a film. Roughening primarily increases surface roughness. Of course, in other embodiments, the optical lens 10 may also eliminate stray light in other ways; this application does not strictly limit this approach.

[0125] 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 this application enable the optical lens to have a large target area, resulting in high image clarity.

[0126] In some embodiments, the optical lens 10 satisfies the relationship: FOV≤140°, where FOV is the full field of view of the optical lens 10.

[0127] In some embodiments, the multiple lenses of the optical lens 10 are assembled using an active alignment (AA) process to ensure assembly accuracy.

[0128] In some embodiments, when the object-side and / or image-side surfaces of some lenses in the optical lens 10 are aspherical, the object-side and / or image-side surfaces of some lenses can be defined using, but not limited to, the following aspherical formulas:

[0129]

[0130] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; k is the cone coefficient; α i Let be the i-th order aspherical coefficient.

[0131] The following will use four embodiments in combination Figures 2 to 22 Some specific, non-limiting examples of this application are described in more detail below.

[0132] First Embodiment

[0133] Please refer to the following: 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 an aperture 40, a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the image side. The first lens group G1 has positive optical power and includes a first lens L1, a second lens L2, and a third lens L3. The second lens group G2 has negative optical power and includes a fourth lens L4 and a fifth lens L5. The third lens group G3 has positive optical power and includes a sixth lens L6. The first lens L1 to the sixth lens L6 are arranged sequentially from the object side to the image side. The aperture 40 is a variable aperture, and its size can be adjusted as needed. The aperture 40 is located on the object side of the first lens L1. In other embodiments, the aperture 40 can also be in other positions, which is not limited in this application.

[0134] In this embodiment, the first lens L1 has positive optical power and includes an object-side surface S1 and an image-side surface S2; the second lens L2 has negative optical power and includes an object-side surface S3 and an image-side surface S4; the third lens L3 has positive optical power and includes an object-side surface S5 and an image-side surface S6; the fourth lens L4 has negative optical power and includes an object-side surface S7 and an image-side surface S8; the fifth lens L5 has positive optical power and includes an object-side surface S9 and an image-side surface S10; the sixth lens L6 has positive optical power and includes an object-side surface S11 and an image-side surface S12. Furthermore, a filter 20 is disposed after the sixth lens L6 and includes an object-side surface S13 and an image-side surface S14. Imaging plane S15 ( Figure 2 , Figure 3 and Figure 4 (Not marked) Located on the image side of all lenses in the optical lens 10, the imaging surface S15 is the cross surface on which the image is formed after the light passes through each lens in the optical lens 10 in sequence.

[0135] 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 may all be made of glass or all of plastic, or may include both glass and plastic materials; this application does not limit this.

[0136] In this embodiment, when the camera module 200 switches from a non-working state (storage state) to a working state (far-view state or close-view state), the first lens group G1 and the second lens group G2 move along the optical axis O towards the object side, while the third lens group G3 remains stationary; when the camera module 200 switches from a working state to a non-working state, the first lens group G1 and the second lens group G2 move along the optical axis O towards the image side, while the third lens group G3 remains stationary, so that the overall size of the camera module 200 is low and does not cause protrusions in the corresponding parts of the electronic device 1000.

[0137] In this embodiment, when the camera module 200 switches from a distant view to a close view, the second lens group G2 moves along the optical axis O towards the image side, while the first lens group G1 and the third lens group G3 remain stationary to achieve focusing.

[0138] In this embodiment, when the camera module 200 switches from a close-up view to a distant view, the second lens group G2 moves along the optical axis O towards the object side, while the first lens group G1 and the third lens group G3 remain stationary to achieve focusing.

[0139] Please refer to Table 1a, which shows 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 when operating in both distant and close-up modes. The thickness includes the thickness of the lens itself and the spacing between the lenses, and the Abbe number is the dispersion coefficient.

[0140] Table 1a

[0141]

[0142] In Table 1a, 0.1068 / 2.3500 means that at an object distance of infinity, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 0.1068 mm, and at an object distance of 50 mm, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 2.3500 mm. 4.6882 / 2.4450 means that at an object distance of infinity, the distance between the second lens group G2 and the third lens group G3 on the optical axis is 4.6882 mm, and at an object distance of 50 mm, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 2.4450 mm.

[0143] Please refer to Table 1b, which shows the aspherical coefficients of each lens in the optical lens 10 of the first embodiment.

[0144] Table 1b

[0145]

[0146] In this embodiment, the object-side surface and image-side surface of the first lens L1 to the sixth lens L6 are both aspherical surfaces, which can be limited by, but not limited to, the following aspherical surface formula:

[0147]

[0148] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; k is the cone coefficient; α i Let be the i-th order aspherical coefficient.

[0149] Please refer to Table 1c, which shows 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 the diagonal size of the photosensitive element; and Fno is the aperture number.

[0150] Table 1c

[0151]

[0152] In this embodiment, when the optical lens 10 switches from a distant view to a close-up view, for example, when focusing at a macro distance of 50mm, the distance between the first lens group G1 and the second lens group G2 increases from 0.1068mm to 2.3500mm. The focusing distance of the second lens group G2 is 2.2432mm, which is short and provides good focusing effect, thus achieving excellent macro shooting results. In this embodiment, macro focusing and shooting are achieved by moving the second lens group G2 towards the image side, while the first lens group G1 remains stationary. This allows macro shooting to be achieved without increasing the size of the optical lens 10.

[0153] Please see Figure 6 , Figure 6 This is a characterization diagram of the optical performance of the optical lens 10 in the first embodiment at an object distance of infinity.

[0154] in, Figure 6 This includes the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical lens 10 at an infinity object distance. The axial chromatic aberration curve includes spherical aberration curves corresponding to different wavelengths of the system (650nm, 610nm, 555nm, 510nm, and 470nm are shown in the illustration). Its physical meaning is the deviation of light of the corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. Figure 6 The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line S represents the sagittal beam, and the dashed line T represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 6 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 6 The distortion shown is all within 2%, which ensures that there is no obvious deformation in the image.

[0155] Please see Figure 7 , Figure 7 This is a characterization diagram of the optical performance of the optical lens 10 in the first embodiment at an object distance of 50mm.

[0156] in, Figure 7 This includes the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical lens 10 at an object distance of 50mm. The axial chromatic aberration curve includes spherical aberration curves corresponding to different wavelengths of the system (illustrated as 650nm, 610nm, 555nm, 510nm, and 470nm).Figure 7 The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line S represents the sagittal beam, and the dashed line T represents the meridional beam. When a value in a certain field of view is too large, the image quality of that field of view is poor or contains advanced aberrations. Figure 7 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 7 The distortion shown is all within 3%, which ensures that there is no obvious deformation in the image.

[0157] according to Figure 6 and Figure 7 It can be seen that the optical lens 10 given in the first embodiment can achieve good imaging quality at both infinity and macro distances of 50mm.

[0158] Second Embodiment

[0159] Please refer to the following: Figure 8 , Figure 9 and Figure 10 , Figure 8 This is a schematic diagram of the structure of the camera module 200 according to the second embodiment of this application. Figure 9 for Figure 8 The diagram shows the structure of the camera module 200 in one working state. Figure 10 for Figure 8 The diagram shows the structure of the camera module 200 in another working state. Figure 8 The camera module 200 shown is in a non-functional state. Figure 9 for Figure 8 The image shows the camera module 200 in its long-range working state at infinity. Figure 10 for Figure 8 The image shows the close-up working state of the camera module during macro shooting at 200.

[0160] 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 an aperture 40, a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the image side. The first lens group G1 has positive optical power and includes a first lens L1, a second lens L2, and a third lens L3. The second lens group G2 has negative optical power and includes a fourth lens L4, a fifth lens L5, and a sixth lens L6. The third lens group G3 has positive optical power and includes a seventh lens L7. The first lens L1 to the seventh lens L7 are arranged sequentially from the object side to the image side. The aperture 40 is a variable aperture, and its size can be adjusted as needed. The aperture 40 is located on the object side of the first lens L1. In other embodiments, the aperture 40 can also be in other positions, which is not limited in this application.

[0161] In this embodiment, the first lens L1 has positive optical power and includes an object-side surface S1 and an image-side surface S2; the second lens L2 has negative optical power and includes an object-side surface S3 and an image-side surface S4; the third lens L3 has positive optical power and includes an object-side surface S5 and an image-side surface S6; the fourth lens L4 has negative optical power and includes an object-side surface S7 and an image-side surface S8; the fifth lens L5 has positive optical power and includes an object-side surface S9 and an image-side surface S10; the sixth lens L6 has negative optical power and includes an object-side surface S11 and an image-side surface S12; and the seventh lens L7 has positive optical power and includes an object-side surface S13 and an image-side surface S14. Furthermore, the filter 20 is disposed after the seventh lens L7 and includes an object-side surface S15 and an image-side surface S16. Imaging plane S17 ( Figure 8 , Figure 9 and Figure 10 (Not shown) Located on the image side of all lenses in the optical lens 10, the imaging surface S17 is the surface on which the image is formed after light passes through each lens in the optical lens 10 in sequence. 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.

[0162] In this embodiment, when the camera module 200 switches from a non-working state (storage state) to a working state (far-view state or close-view state), the first lens group G1 and the second lens group G2 move along the optical axis O towards the object side, while the third lens group G3 remains stationary; when the camera module 200 switches from a working state to a non-working state, the first lens group G1 and the second lens group G2 move along the optical axis O towards the image side, while the third lens group G3 remains stationary, so that the overall size of the camera module 200 is low and does not cause protrusions in the corresponding parts of the electronic device 1000.

[0163] In this embodiment, when the camera module 200 switches from a distant view to a close view, the second lens group G2 moves along the optical axis O towards the image side, while the first lens group G1 and the third lens group G3 remain stationary to achieve focusing.

[0164] In this embodiment, when the camera module 200 switches from a close-up view to a distant view, the second lens group G2 moves along the optical axis O towards the object side, while the first lens group G1 and the third lens group G3 remain stationary to achieve focusing.

[0165] Please refer to Table 2a, which shows the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 20 in the optical lens 10 of the second embodiment in both distant 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.

[0166] Table 2a

[0167]

[0168]

[0169] In Table 2a, 0.1 / 1.846 means that at an object distance of infinity, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 0.1 mm, and at an object distance of 50 mm, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 1.846 mm. 2.7640 / 1.018 means that at an object distance of infinity, the distance between the second lens group G2 and the third lens group G3 on the optical axis is 2.7640 mm, and at an object distance of 50 mm, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 1.018 mm.

[0170] Please refer to Table 2b, which shows the aspherical coefficients of each lens in the optical lens 10 of the second embodiment.

[0171] Table 2b

[0172]

[0173]

[0174] In this embodiment, the object-side surface and image-side surface of the first lens L1 to the seventh lens L7 are both aspherical surfaces, which can be limited by, but not limited to, the following aspherical surface formula:

[0175]

[0176] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; k is the cone coefficient; α i Let be the i-th order aspherical coefficient.

[0177] Please refer to Table 2c, which shows the basic parameters of the optical lens 10 in the second embodiment. In Table 2c, 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 the diagonal size of the photosensitive element; and Fno is the aperture number.

[0178] Table 2c

[0179]

[0180] In this embodiment, when the optical lens 10 switches from a distant view to a close-up view, for example, when focusing at a macro distance of 50mm, the distance between the first lens group G1 and the second lens group G2 increases from 0.1mm to 1.846mm. The focusing distance of the second lens group G2 is 1.746mm, which is short and provides good focusing effect, thus achieving excellent macro shooting results. In this embodiment, macro focusing and shooting are achieved by moving the second lens group G2 towards the image side, while the first lens group G1 remains stationary. This allows macro shooting to be achieved without increasing the size of the optical lens 10.

[0181] Please see Figure 11 , Figure 11 This is a characterization diagram of the optical performance of the optical lens 10 in the second embodiment when the object distance is infinity.

[0182] in, Figure 11 This includes the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical lens 10 at an infinity object distance. The axial chromatic aberration curve includes spherical aberration curves corresponding to different wavelengths of the system (650nm, 610nm, 555nm, 510nm, and 470nm are shown in the illustration). Its physical meaning is the deviation of light of the corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. Figure 11 The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line S represents the sagittal beam, and the dashed line T represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 11The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 11 The distortion shown is all within 2.5%, which ensures that there is no obvious distortion in the image.

[0183] Please see Figure 12 , Figure 12 This is a characterization diagram of the optical performance of the optical lens 10 in the second embodiment at an object distance of 50mm.

[0184] in, Figure 12 This includes the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical lens 10 at an object distance of 50mm. The axial chromatic aberration curve includes spherical aberration curves corresponding to different wavelengths of the system (illustrated as 650nm, 610nm, 555nm, 510nm, and 470nm). Figure 12 The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line S represents the sagittal beam, and the dashed line T represents the meridional beam. When a value in a certain field of view is too large, the image quality of that field of view is poor or contains advanced aberrations. Figure 12 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 12 The distortion shown is all within 2.5%, which ensures that there is no obvious distortion in the image.

[0185] according to Figure 11 and Figure 12 It can be seen that the optical lens 10 given in the second embodiment can achieve good imaging quality at both infinity and macro distances of 50mm.

[0186] Third Embodiment

[0187] Please refer to the following: Figure 13 , Figure 14 and Figure 15 , Figure 13 This is a schematic diagram of the structure of the camera module 200 according to the third embodiment of this application. Figure 14 for Figure 13 The diagram shows the structure of the camera module 200 in one working state. Figure 15 for Figure 13 The diagram shows the structure of the camera module 200 in another working state. Figure 13 The camera module 200 shown is in a non-functional state. Figure 14 for Figure 13 The image shows the camera module 200 in its long-range working state at infinity.Figure 15 for Figure 13 The image shows the close-up working state of the camera module during macro shooting at 200.

[0188] 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 an aperture 40, a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the image side. The first lens group G1 has positive optical power and includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The second lens group G2 has negative optical power and includes a fifth lens L5 and a sixth lens L6. The third lens group G3 has negative optical power and includes a seventh lens L7. The first lens L1 to the seventh lens L7 are arranged sequentially from the object side to the image side. The aperture 40 is a variable aperture, and its size can be adjusted as needed. The aperture 40 is located on the object side of the first lens L1. In other embodiments, the aperture 40 can also be in other positions, which is not limited in this application.

[0189] In this embodiment, the first lens L1 has positive optical power and includes an object-side surface S1 and an image-side surface S2; the second lens L2 has negative optical power and includes an object-side surface S3 and an image-side surface S4; the third lens L3 has positive optical power and includes an object-side surface S5 and an image-side surface S6; the fourth lens L4 has positive optical power and includes an object-side surface S7 and an image-side surface S8; the fifth lens L5 has negative optical power and includes an object-side surface S9 and an image-side surface S10; the sixth lens L6 has positive optical power and includes an object-side surface S11 and an image-side surface S12; and the seventh lens L7 has negative optical power and includes an object-side surface S13 and an image-side surface S14. Furthermore, the filter 20 is disposed after the seventh lens L7 and includes an object-side surface S15 and an image-side surface S16. Imaging plane S17 ( Figure 13 , Figure 14 and Figure 15 (Not shown) Located on the image side of all lenses in the optical lens 10, the imaging surface S17 is the surface on which the image is formed after light passes through each lens in the optical lens 10 in sequence. 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.

[0190] In this embodiment, when the camera module 200 switches from a non-working state (storage state) to a working state (far-view state or close-view state), the first lens group G1 and the second lens group G2 move along the optical axis O towards the object side, while the third lens group G3 remains stationary; when the camera module 200 switches from a working state to a non-working state, the first lens group G1 and the second lens group G2 move along the optical axis O towards the image side, while the third lens group G3 remains stationary, so that the overall size of the camera module 200 is low and does not cause protrusions in the corresponding parts of the electronic device 1000.

[0191] In this embodiment, when the camera module 200 switches from a distant view to a close view, the second lens group G2 moves along the optical axis O towards the image side, while the first lens group G1 and the third lens group G3 remain stationary to achieve focusing.

[0192] In this embodiment, when the camera module 200 switches from a close-up view to a distant view, the second lens group G2 moves along the optical axis O towards the object side, while the first lens group G1 and the third lens group G3 remain stationary to achieve focusing.

[0193] Please refer to Table 3a, which shows the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 20 in the optical lens 10 of the third embodiment when operating in both distant and close-up modes. The thickness includes the thickness of the lens itself and the spacing between lenses, and the Abbe number is the dispersion coefficient.

[0194] Table 3a

[0195]

[0196] In Table 3a, 1.1344 / 4.2844 refers to the following: at an object distance of infinity, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 1.1344 mm; at an object distance of 50 mm, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 4.2844 mm. 5.1655 / 2.0156 refers to the following: at an object distance of infinity, the distance between the second lens group G2 and the third lens group G3 on the optical axis is 5.1655 mm; at an object distance of 50 mm, the distance between the first lens group G1 and the second lens group G2 on the optical axis is 2.0156 mm.

[0197] Please refer to Table 3b, which shows the aspherical coefficients of each lens in the optical lens 10 of the third embodiment.

[0198] Table 3b

[0199]

[0200]

[0201] In this embodiment, the object-side surface and image-side surface of the first lens L1 to the seventh lens L7 are both aspherical surfaces, which can be limited by, but not limited to, the following aspherical surface formula:

[0202]

[0203] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; k is the cone coefficient; α i Let be the i-th order aspherical coefficient.

[0204] Please refer to Table 3c, which shows the basic parameters of the optical lens 10 in the third embodiment. In Table 3c, 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 the diagonal size of the photosensitive element; and Fno is the aperture number.

[0205] Table 3c

[0206]

[0207] In this embodiment, when the optical lens 10 switches from a distant view to a close-up view, for example, when focusing at a macro distance of 50mm, the distance between the first lens group G1 and the second lens group G2 increases from 1.1344mm to 4.2844mm. The focusing distance of the second lens group G2 is 3.15mm, which is short and provides good focusing effect, thus achieving excellent macro shooting results. In this embodiment, macro focusing and shooting are achieved by moving the second lens group G2 towards the image side, while the first lens group G1 remains stationary. This allows macro shooting to be achieved without increasing the size of the optical lens 10.

[0208] Please see Figure 16 , Figure 16 This is a characterization diagram of the optical performance of the optical lens 10 in the third embodiment at an object distance of infinity.

[0209] in, Figure 16 This includes the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical lens 10 at an infinity object distance. The axial chromatic aberration curve includes spherical aberration curves corresponding to different wavelengths of the system (650nm, 610nm, 555nm, 510nm, and 470nm are shown in the illustration). Its physical meaning is the deviation of light of the corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. Figure 16The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line S represents the sagittal beam, and the dashed line T represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 16 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 16 The distortion shown is all within 2%, which ensures that there is no obvious deformation in the image.

[0210] Please see Figure 17 , Figure 17 This is a characterization diagram of the optical performance of the optical lens 10 in the third embodiment at an object distance of 50mm.

[0211] in, Figure 17 This includes the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical lens 10 at an object distance of 50mm. The axial chromatic aberration curve includes spherical aberration curves corresponding to different wavelengths of the system (illustrated as 650nm, 610nm, 555nm, 510nm, and 470nm). Figure 17 The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line S represents the sagittal beam, and the dashed line T represents the meridional beam. When a value in a certain field of view is too large, the image quality of that field of view is poor or contains advanced aberrations. Figure 17 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 17 The distortion shown is all within 5%, which ensures that there is no obvious deformation in the image.

[0212] according to Figure 16 and Figure 17 It can be seen that the optical lens 10 given in the third embodiment can achieve good imaging quality at both infinity and macro distances of 50mm.

[0213] Fourth embodiment

[0214] Please refer to the following: Figure 18 , Figure 19 and Figure 20 , Figure 18 This is a schematic diagram of the structure of the camera module 200 according to the fourth embodiment of this application. Figure 19 for Figure 18 The diagram shows the structure of the camera module 200 in one working state.Figure 20 for Figure 18 The diagram shows the structure of the camera module 200 in another working state. Figure 18 The camera module 200 shown is in a non-functional state. Figure 19 for Figure 18 The image shows the camera module 200 in its long-range working state at infinity. Figure 20 for Figure 18 The image shows the close-up working state of the camera module during macro shooting at 200.

[0215] 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 an aperture 40, a first lens group G1, a second lens group G2, and a third lens group G3 arranged sequentially from the object side to the image side. The first lens group G1 has positive optical power and includes a first lens L1, a second lens L2, and a third lens L3. The second lens group G2 has negative optical power and includes a fourth lens L4, a fifth lens L5, and a sixth lens L6. The third lens group G3 has positive optical power and includes a seventh lens L7. The first lens L1 to the seventh lens L7 are arranged sequentially from the object side to the image side. The aperture 40 is a variable aperture, and its size can be adjusted as needed. The aperture 40 is located on the object side of the first lens L1. In other embodiments, the aperture 40 can also be in other positions, which is not limited in this application.

[0216] In this embodiment, the first lens L1 has positive optical power and includes an object-side surface S1 and an image-side surface S2; the second lens L2 has negative optical power and includes an object-side surface S3 and an image-side surface S4; the third lens L3 has positive optical power and includes an object-side surface S5 and an image-side surface S6; the fourth lens L4 has negative optical power and includes an object-side surface S7 and an image-side surface S8; the fifth lens L5 has positive optical power and includes an object-side surface S9 and an image-side surface S10; the sixth lens L6 has negative optical power and includes an object-side surface S11 and an image-side surface S12; and the seventh lens L7 has positive optical power and includes an object-side surface S13 and an image-side surface S14. Furthermore, a filter is disposed after the seventh lens L7 and includes an object-side surface S15 and an image-side surface S16. Imaging plane S17 ( Figure 18 , Figure 19 and Figure 20 (Not shown) Located on the image side of all lenses in the optical lens 10, the imaging surface S17 is the surface on which the image is formed after light passes through each lens in the optical lens 10 in sequence. 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.

[0217] It should be noted that, Figure 18 ,Figure 19 and Figure 20 The seventh lens L7 in the image has a partially open area. This is because the open area is a non-effective area. This non-effective area does not affect the optical path. During production, the workers can manufacture it as a closed lens according to the mold forming conditions.

[0218] In this embodiment, when the camera module 200 switches from a non-working state (storage state) to a working state (far-view state or close-view state), the first lens group G1 and the second lens group G2 move along the optical axis O towards the object side, while the third lens group G3 remains stationary; when the camera module 200 switches from a working state to a non-working state, the first lens group G1 and the second lens group G2 move along the optical axis O towards the image side, while the third lens group G3 remains stationary, so that the overall size of the camera module 200 is low and does not cause protrusions in the corresponding parts of the electronic device 1000.

[0219] In this embodiment, when the camera module 200 switches from a distant view to a close view, the first lens group G1 moves along the optical axis O towards the object side, the second lens group G2 moves along the optical axis O towards the image side, and the third lens group G3 remains stationary to achieve focusing.

[0220] In this embodiment, when the camera module 200 switches from a close-up view to a distant view, the first lens group G1 moves along the optical axis O towards the image side, the second lens group G2 moves along the optical axis O towards the object side, and the third lens group G3 remains stationary to achieve focusing.

[0221] Please refer to Table 4a, which shows the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 20 in the optical lens 10 of the fourth embodiment when operating in both distant and close-up modes. The thickness includes the thickness of the lens itself and the spacing between lenses, and the Abbe number is the dispersion coefficient.

[0222] Table 4a

[0223]

[0224]

[0225] In Table 4a, 0.6696 / 3.3476 refers to the distance between the first lens group G1 and the second lens group G2 on the optical axis being 0.6696 mm at an object distance of infinity, and 3.3476 mm at an object distance of 50 mm. Similarly, 2.3019 / 0.1443 refers to the distance between the second lens group G2 and the third lens group G3 on the optical axis being 2.3019 mm at an object distance of infinity, and 0.1443 mm at an object distance of 50 mm.

[0226] Please refer to Table 4b, which shows the aspherical coefficients of each lens in the optical lens 10 of the fourth embodiment.

[0227] Table 4b

[0228]

[0229]

[0230] In this embodiment, the object-side surface and image-side surface of the first lens L1 to the seventh lens L7 are both aspherical surfaces, which can be limited by, but not limited to, the following aspherical surface formula:

[0231]

[0232] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; k is the cone coefficient; α i Let be the i-th order aspherical coefficient.

[0233] Please refer to Table 4c, which shows 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 the diagonal size of the photosensitive element; Fno is the aperture number; and the closest object distance in this embodiment is 50mm.

[0234] Table 4c

[0235]

[0236] In this embodiment, when the optical lens 10 switches from a distant view to a close-up view, for example, when focusing at a macro 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. The focusing distance of the second lens group G2 is 2.1576mm, which is short and provides good focusing effect, enabling excellent macro shooting results. In this embodiment, when the optical lens 10 switches from a distant view to a close-up view, both the first lens group G1 and the second lens group G2 move, thus increasing the degree of freedom and helping to compensate for image plane drift caused by changes in the object plane during macro focusing, resulting in better macro focusing effect.

[0237] Please see Figure 21 , Figure 21 This is a characterization diagram of the optical performance of the optical lens 10 in the fourth embodiment at an object distance of infinity.

[0238] in, Figure 21This includes the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical lens 10 at an infinity object distance. The axial chromatic aberration curve includes spherical aberration curves corresponding to different wavelengths of the system (650nm, 610nm, 555nm, 510nm, and 470nm are shown in the illustration). Its physical meaning is the deviation of light of the corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. Figure 21 The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line S represents the sagittal beam, and the dashed line T represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 21 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 21 The distortion shown is all within 3%, which ensures that there is no obvious deformation in the image.

[0239] Please see Figure 22 , Figure 22 This is a characterization diagram of the optical performance of the optical lens 10 in the fourth embodiment at an object distance of 50mm.

[0240] in, Figure 22 This includes the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical lens 10 at an object distance of 50mm. The axial chromatic aberration curve includes spherical aberration curves corresponding to different wavelengths of the system (illustrated as 650nm, 610nm, 555nm, 510nm, and 470nm). Figure 22 The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of optical lens 10 are well corrected. The astigmatism curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. The solid line S represents the sagittal beam, and the dashed line T represents the meridional beam. When a value in a certain field of view is too large, the image quality of that field of view is poor or contains advanced aberrations. Figure 22 The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 22 The distortion shown is all within 8%, which ensures that there is no obvious distortion in the image.

[0241] according to Figure 21 and Figure 22 It can be seen that the optical lens 10 given in the fourth embodiment can achieve good imaging quality at both infinity and macro distances of 50mm.

[0242] In other embodiments, when the camera module 200 switches from a distant view to a close view, the third lens group G3 can also move toward the object side or the image side.

[0243] In other embodiments, when the camera module 200 switches from a close-up view to a distant view, the third lens group G3 can also move toward the object side or the image side.

[0244] During the focusing process of the optical lens 10 from a distant view to a close-up view, the second lens group G2 can move towards the image side, or the first lens group G1 can move towards the object side, or the first lens group G1 can move towards the object side and the second lens group G2 can move towards the image side, thereby increasing the distance between the first lens group G1 and the second lens group G2 to achieve a macro focusing effect. The optical lens 10 of this application has the characteristics of long focal length, large target surface, macro capability, and large light transmission aperture, and can be miniaturized.

[0245] The above description and embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. Where there is no conflict, the embodiments of this 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≤20mm, 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 ≤ 5. 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≤φ1≤10mm.

9. 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.

10. 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.

11. 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.

12. 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.

13. 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.

14. 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.

15. The optical lens according to claim 14, 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.

16. The optical lens according to claim 14, characterized in that, At least one lens in the third lens group has an aspherical optical surface.

17. 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.

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

19. An electronic device, characterized in that, The device includes an image processor and a camera module as described in claim 18, 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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