Telephoto lens, camera module and electronic equipment

Abstract

A telephoto lens (1), a camera module (10) and an electronic device (100). And when the telephoto lens (1) is focused at a distant view, the field angle FOV of the telephoto lens (1) is less than 60 degrees. The telephoto lens (1) includes a first lens group (G1) and a second lens group (G2) arranged from an object side to an image side, the first lens group (G1) having a positive refractive power, the second lens group (G2) having a negative refractive power, and a distance between the first lens group (G1) and the second lens group (G2) varies during a focusing process in which the telephoto lens (1) is switched between a distant view and a close view. The telephoto lens (1) not only can realize long-range shooting and high imaging quality, but also can have relatively strong close-range shooting capability, so that wide object distance imaging from long-range shooting to close-range shooting is realized.

Description

[0001] This application is a divisional application. The application number of the original application is 202380020984.7, and the original application date is March 13, 2023. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the technical field of photographing equipment, and in particular to a telephoto lens, a camera module and an electronic device. Background Art

[0003] Existing telephoto lenses are mainly used for long-range photography. When photographing distant objects or objects that are difficult to approach, telephoto lenses can show the details of distant objects and have good long-range photography capabilities. However, existing telephoto lenses have poor imaging effects when photographing close-ups, which limits the application of telephoto lenses in close-up photography scenarios. Summary of the invention

[0004] The present application provides a telephoto lens, a camera module and an electronic device. The telephoto lens can achieve long-distance shooting with high imaging quality, and also has strong close-up shooting capabilities to achieve wide-range imaging from long-distance to close-up.

[0005] In a first aspect, the present application provides a telephoto lens. When the telephoto lens focuses on a distant view, the field of view of the telephoto lens is less than 60°. The telephoto lens includes a first lens group and a second lens group arranged from the object side to the image side, the first lens group has a positive optical focal length, the second lens group has a negative optical focal length, and the distance between the first lens group and the second lens group changes during the focusing process of the telephoto lens switching between the distant view and the near view, and the closest focusing distance of the telephoto lens is less than 10 cm.

[0006] The telephoto lens provided in the present application can not only achieve long-distance shooting with high image quality, but also has strong close-up shooting capabilities, achieving wide object distance imaging from long-distance to close-up.

[0007] In addition, the first lens group has positive optical power and the second lens group has negative optical power, so that the height of the telephoto lens is smaller than the effective focal length EFL of the telephoto lens, so as to reduce the height of the telephoto lens, which is conducive to the miniaturization of the camera module.

[0008] In some implementations, during the focusing process of the telephoto lens switching from a distant view to a near view, the distance between the first lens group and the second lens group increases.

[0009] In this implementation manner, during the focusing process of the telephoto lens when switching from a long-distance view to a close-up view, the distance between the first lens group and the second lens group increases, and relatively high close-up imaging quality can be obtained. In some other implementation manners, during the focusing process of the telephoto lens when switching from a long-distance view to a close-up view, the distance between the first lens group and the second lens group can also decrease, and the present application does not limit this.

[0010] In some implementation manners, during the focusing process of the telephoto lens when switching from a long-distance view to a close-up view, the distance between the first lens group and the imaging surface of the telephoto lens remains unchanged, and the distance between the second lens group and the imaging surface of the telephoto lens decreases;

[0011] Or, the distance between the first lens group and the imaging surface of the telephoto lens increases, and the distance between the second lens group and the imaging surface of the telephoto lens remains unchanged;

[0012] Or, the distance between the first lens group and the imaging surface of the telephoto lens increases, and the distance between the second lens group and the imaging surface of the telephoto lens decreases.

[0013] In this implementation manner, a single-group focusing method can be adopted to simplify the movement manner of the focusing structure and simplify the focusing method. Among them, the first lens group remains stationary, and focusing is performed by moving the second lens group, which can simplify the movement manner of the focusing structure of the telephoto lens, thereby simplifying the focusing method. In addition, the first lens group is located on the object side of the second lens group, increasing the movable optical path space, which is beneficial to reducing the light turning angle, reducing aberration, and improving imaging quality. If the second lens group remains stationary and focusing is performed by moving the first lens group, the movement manner of the focusing structure of the telephoto lens can be simplified, thereby simplifying the focusing method.

[0014] In addition, a double-group focusing method can also be adopted. In this implementation manner, the distances between the first lens group and the second lens group and the imaging surface both change, thereby reducing the respective focusing strokes of the first lens group and the second lens group, and also improving the movement accuracy of the first lens group and the second lens group, enhancing the focusing ability of the telephoto lens.

[0015] In some implementation manners, the focal length F1 of the first lens group and the effective focal length EFL of the telephoto lens satisfy: F1 ≤ 0.9EFL, or, 0.9EFL < F1 < EFL.

[0016] In this implementation manner, by setting F1 ≤ 0.9EFL, or, 0.9EFL < F1 < EFL, the focal length of the first lens group is relatively small, and the light converging ability is relatively strong, enabling the telephoto lens to be used for close-up shooting within 10 centimeters.

[0017] In some implementation manners, the focal length F2 of the second lens group and the effective focal length EFL of the telephoto lens satisfy: -EFL < F2.

[0018] In this implementation, by setting -EFL < F2, the thickness of the second lens group can be reduced, thereby reducing the height of the telephoto lens, facilitating storage; and making the focal length of the second lens group smaller, with a stronger light converging ability, facilitating focusing and reducing the motor travel. In addition, the small thickness of the second lens group can reduce the height of the telephoto lens, which is beneficial to the miniaturization of the camera module.

[0019] In some implementations, the focal length F1 of the first lens group and the focal length F2 of the second lens group satisfy: 1 < (F1 - F2) / F1 ≤ 3, or, 3 < (F1 - F2) / F1 < 9.

[0020] In this implementation, when the focal lengths of both lens groups are relatively small and the difference between the focal lengths of the two lens groups is relatively small, that is, the value of (F1 - F2) / F1 is small, the light converging ability of the telephoto lens will be improved, which is beneficial to achieving near - field imaging; but it will increase the degree of light deflection of the telephoto lens, increase aberration, and the imaging may be unclear and the imaging quality is poor. When the focal length of the second lens group is large and the difference from the focal length of the first lens group is large, that is, the value of (F1 - F2) / F1 is large, the light converging ability of the telephoto lens will be reduced, which is not conducive to achieving near - field imaging; but it will reduce the degree of light deflection of the telephoto lens, reduce aberration, and improve the imaging quality. Therefore, the focal lengths of the two lens groups can be designed according to the requirements of the actual application scenario. By setting 1 < (F1 - F2) / F1 ≤ 3, or, 3 < (F1 - F2) / F1 < 9, the focusing ability and imaging quality of the telephoto lens can be improved.

[0021] In some implementations, the first lens group includes two to four lenses; or, the second lens group includes two to four lenses; or, the telephoto lens includes four to eight lenses.

[0022] In this implementation, by adjusting the number of lenses in the first lens group and the second lens group, different specifications of designs can be obtained to adapt to diverse application scenarios. Exemplarily, if the number of lenses in the first lens group and the second lens group is large, the specification of the telephoto lens is high and the imaging quality is high, but the design difficulty of each lens in the first lens group and the second lens group is increased; if the number of lenses in the first lens group and the second lens group is small, the design difficulty of each lens in the first lens group and the second lens group is low, but the specification of the telephoto lens is low and the imaging quality is poor. Different numbers of lenses can be selected according to different requirements.

[0023] In some implementations, the first lens group includes a first lens near the object side, and the focal length f11 of the first lens of the first lens group and the focal length F1 of the first lens group satisfy: 0.5 < f11 / F1 < 1;

[0024] The second lens group includes a first lens near the object side, and the focal length f21 of the first lens of the second lens group and the focal length F2 of the second lens group satisfy: 0.2 < f21 / F2 < 1.

[0025] In this implementation, by designing 0.5 < f11 / F1 < 1, the difference between the focal length of the first lens of the first lens group and the focal length of the first lens group is small, which is convenient for adjusting the focal length of the first lens to obtain the focal length of the first lens group.

[0026] In addition, by designing 0.2 < f21 / F1 < 1, the difference between the focal length of the first lens of the second lens group and the focal length of the second lens group is small, which is convenient for adjusting the focal length of the first lens to obtain the focal length of the second lens group.

[0027] In some implementations, the first lens group further includes a second lens, the second lens of the first lens group is adjacent to the object side of the first lens of the first lens group, and the sum of the Abbe number of the first lens of the first lens group and the Abbe number of the second lens of the first lens group is greater than 20.

[0028] In this implementation, the sum of the Abbe number of the first lens and the Abbe number of the second lens can be greater than 20, which is beneficial to the chromatic aberration correction of the telephoto lens.

[0029] In some implementations, the sum of the Abbe numbers of the multiple lenses of the second lens group is greater than 18.

[0030] In this implementation, the sum of the Abbe numbers of the multiple lenses of the second lens group is greater than 18, which is beneficial to the chromatic aberration correction of the telephoto lens.

[0031] In some implementations, the thickness T1 of the first lens group and the focal length F1 of the first lens group satisfy: 0.1 < T1 / F1 ≤ 0.3, or, 0.3 < T1 / F1 < 1;

[0032] Or, the thickness T2 of the second lens group and the focal length F2 of the second lens group satisfy: -1 < T2 / F2 < -0.1.

[0033] In this implementation, by setting 0.1 < T1 / F1 ≤ 0.3, or, 0.3 < T1 / F1 < 1, the thickness of the first lens group is small, so that the height of the telephoto lens can be reduced, which is convenient for storage; and it is convenient for the movement of the first lens group to improve the imaging quality.

[0034] In addition, by setting -1 < T2 / F2 < -0.1, it is beneficial to make the second lens group have a small thickness, thereby reducing the height of the telephoto lens 1, which is convenient for storage; and it is convenient for the movement of the second lens group to improve the imaging quality.

[0035] In some implementation manners, the thickness T1 of the first lens group, the thickness T2 of the second lens group, and the effective focal length EFL of the telephoto lens satisfy: T1 + T2 ≤ 0.6EFL, or, 0.6EFL < T1 + T2 ≤ 0.8EFL, or, 0.8EFL < T1 + T2 < EFL.

[0036] In this implementation manner, by setting T1 + T2 ≤ 0.6EFL, or, 0.6EFL < T1 + T2 ≤ 0.8EFL, or, 0.8EFL < T1 + T2 < EFL, the sum of the thickness of the first lens group and the thickness of the second lens group is small, so that when the telephoto lens is in the retracted state, the overall height of the camera module is small, and it occupies a small space in the whole machine cavity of the electronic device, which is convenient for storage and can be better applied to thin electronic devices.

[0037] In some implementation manners, the image height ImgH of the telephoto lens satisfies: ImgH > 2 mm.

[0038] In this implementation manner, the telephoto lens has a small field of view angle and a large board size to have a strong long-distance shooting ability and high imaging quality in long-distance shooting.

[0039] In a second aspect, the present application further provides a camera module, including a photosensitive element, a first driving mechanism, and a telephoto lens. The photosensitive element is located on the image side of the telephoto lens; the first driving mechanism is connected to the telephoto lens and is used to control the telephoto lens to move in a direction close to or away from the photosensitive element. The camera module provided by the present application can not only achieve long-distance shooting with high imaging quality, but also have a strong close-up shooting ability, realizing wide object distance imaging from long-distance to close-up.

[0040] The telephoto lens provided by the present application can not only achieve long-distance shooting with high imaging quality, but also have a strong close-up shooting ability, realizing wide object distance imaging from long-distance to close-up.

[0041] In addition, the present application can achieve auto focus (AF) through the first driving mechanism.

[0042] In some implementation manners, the camera module further includes a second driving mechanism. The second driving mechanism is connected to the first lens group and is used to control the first lens group to move along the optical axis;

[0043] and / or the camera module further includes a third driving mechanism. The third driving mechanism is connected to the second lens group and is used to control the second lens group to move along the optical axis.

[0044] In this implementation manner, the second driving mechanism is used to control the first lens group to move along the optical axis to change the distance between the first lens group and the second lens group, so as to realize the switching of the telephoto lens between the long-distance mode and the close-up mode.

[0045] In addition, the third driving mechanism is used to control the second lens group to move along the optical axis to change the distance between the first lens group and the second lens group, thereby realizing the switching of the telephoto lens between the long-range mode and the short-range mode.

[0046] In a third aspect, the present application further provides an electronic device, including an image processor and a camera module, wherein the image processor is communicatively connected to the camera module, and the image processor is used to obtain an image signal from the camera module and process the image signal. The electronic device provided by the present application can achieve long-distance shooting with high imaging quality, and can also have a strong close-up shooting capability, achieving wide-object distance imaging from long-distance to close-up.

[0047] In a fourth aspect, the present application provides an electronic device, comprising a first lens and a second lens, the second lens being a 3x optical zoom lens of the first lens; when the second lens focuses on a distant view, the field angle of the second lens is less than 60°; the second lens comprises a first lens group and a second lens group arranged from the object side to the image side, the first lens group having a positive optical focal length, the second lens group having a negative optical focal length, and during the focusing process of the second lens switching between a distant view and a near view, the distance between the first lens group and the second lens group changes, and the closest focusing distance of the second lens is less than 10 cm.

[0048] The electronic device provided in the present application can not only realize long-distance shooting with high imaging quality, but also has strong close-up shooting capability, realizing wide-object distance imaging from long-distance to close-up.

[0049] In some implementations, during the focusing process when the second lens switches from a distant view to a close view, the distance between the first lens group and the imaging plane of the second lens remains unchanged, and the distance between the second lens group and the imaging plane of the second lens decreases;

[0050] Or, the distance between the first lens group and the imaging plane of the second lens increases, and the distance between the second lens group and the imaging plane of the second lens remains unchanged;

[0051] Alternatively, the distance between the first lens group and the imaging plane of the second lens increases, and the distance between the second lens group and the imaging plane of the second lens decreases.

[0052] In this implementation, a single-group focusing method can be used to simplify the movement of the focusing structure and the focusing method. The first lens group is stationary, and focusing is performed by moving the second lens group, which can simplify the movement of the focusing structure of the telephoto lens, thereby simplifying the focusing method. In addition, the first lens group is located on the object side of the second lens group, which increases the movable optical path space, helps to reduce the light turning angle, reduce aberrations, and improve imaging quality. The second lens group is stationary, and focusing is performed by moving the first lens group, which can simplify the movement of the focusing structure of the telephoto lens, thereby simplifying the focusing method.

[0053] In addition, a dual-group focusing method can also be adopted. In this implementation, the distances between the first lens group and the second lens group and the imaging surface both change, thereby reducing the focusing stroke of each of the first lens group and the second lens group, improving the movement accuracy of the first lens group and the second lens group, and enhancing the focusing ability of the telephoto lens.

[0054] In some implementations, the focal length F1 of the first lens group and the effective focal length EFL of the second lens satisfy: F1 ≤ 0.9EFL, or, 0.9EFL < F1 < EFL.

[0055] In this implementation, by setting F1 ≤ 0.9EFL, or, 0.9EFL < F1 < EFL, the focal length of the first lens group is relatively small, and its light-gathering ability is relatively strong, enabling the telephoto lens to be used for close-up shooting within 10 cm.

[0056] In some implementations, the focal length F2 of the second lens group and the effective focal length EFL of the second lens satisfy: -EFL < F2.

[0057] In this implementation, by setting -EFL < F2, the thickness of the second lens group can be reduced, thereby reducing the height of the telephoto lens for easy storage; and making the focal length of the second lens group relatively small with relatively strong light-gathering ability for easy focusing and reducing the motor stroke. In addition, the small thickness of the second lens group can reduce the height of the telephoto lens, which is beneficial to the miniaturization of the camera module.

[0058] In some implementations, the focal length F1 of the first lens group and the focal length F2 of the second lens group satisfy: 1 < (F1 - F2) / F1 ≤ 3, or, 3 < (F1 - F2) / F1 < 9.

[0059] In this implementation, when the focal lengths of both lens groups are relatively small and the difference between the focal lengths of the two lens groups is relatively small, that is, the value of (F1 - F2) / F1 is relatively small, the light-gathering ability of the telephoto lens will be enhanced, which is beneficial to realizing close-up imaging; but the degree of light deflection of the telephoto lens will increase, the aberration will increase, and the imaging may be unclear and the imaging quality is poor. When the focal length of the second lens group is relatively large and the difference from the focal length of the first lens group is relatively large, that is, the value of (F1 - F2) / F1 is relatively large, the light-gathering ability of the telephoto lens will be reduced, which is not conducive to realizing close-up imaging; but the degree of light deflection of the telephoto lens will be reduced, the aberration will be reduced, and the imaging quality will be improved. Therefore, the focal lengths of the two lens groups can be designed according to the requirements of the actual application scenario. By setting 1 < (F1 - F2) / F1 ≤ 3, or, 3 < (F1 - F2) / F1 < 9, the focusing ability and imaging quality of the telephoto lens can be enhanced.

[0060] In some implementation manners, the thickness T1 of the first lens group and the focal length F1 of the first lens group satisfy: 0.1 < T1 / F1 ≤ 0.3, or, 0.3 < T1 / F1 < 1;

[0061] or the thickness T2 of the second lens group and the focal length F2 of the second lens group satisfy: -1 < T2 / F2 < -0.1.

[0062] In this implementation manner, by setting 0.1 < T1 / F1 ≤ 0.3, or, 0.3 < T1 / F1 < 1, the thickness of the first lens group is small, so that the height of the telephoto lens can be reduced, facilitating storage; and it is convenient for the movement of the first lens group, improving the imaging quality.

[0063] In addition, by setting -1 < T2 / F2 < -0.1, it is beneficial to make the second lens group have a small thickness, thereby reducing the height of the telephoto lens 1, facilitating storage; and it is convenient for the movement of the second lens group, improving the imaging quality.

[0064] In some implementation manners, the thickness T1 of the first lens group, the thickness T2 of the second lens group and the effective focal length EFL of the second lens satisfy: T1 + T2 ≤ 0.6EFL, or, 0.6EFL < T1 + T2 ≤ 0.8EFL, or, 0.8EFL < T1 + T2 < EFL.

[0065] In this implementation manner, by setting T1 + T2 ≤ 0.6EFL, or, 0.6EFL < T1 + T2 ≤ 0.8EFL, or, 0.8EFL < T1 + T2 < EFL, the sum of the thickness of the first lens group and the thickness of the second lens group is small, so that when the telephoto lens is in the storage state, the overall height of the camera module is small, and it occupies a small space in the whole machine cavity of the electronic device, facilitating storage, and can be better applied to thin electronic devices.

[0066] In some implementation manners, the image height ImgH of the second lens satisfies: ImgH > 2 mm.

[0067] In this implementation manner, the telephoto lens has a small field of view angle and a large board size, so as to have a strong long-distance shooting ability and high imaging quality in long-distance shooting. Brief Description of the Drawings

[0068] Figure 1A is a schematic structural diagram of an electronic device provided by an embodiment of the present application in some embodiments;

[0069] Figure 1B is Figure 1A a schematic diagram of the field of view angle FOV of the shown camera module in some application scenarios;

[0070] Figure 2 is Figure 1A The structure diagram of the camera module shown in some embodiments;

[0071] Figure 3A yes Figure 2 The structural schematic diagram of the camera module shown is in the storage state;

[0072] Figure 3B yes Figure 3A The structural diagram of the camera module shown is in the pop-up state;

[0073] Figure 3C yes Figure 3A The structure diagram of the camera module shown is in another pop-up state;

[0074] Figure 4A is a schematic diagram of the optical path when the camera module focuses on a distant view in the first embodiment provided by the present application;

[0075] Figure 4B yes Figure 4A The optical path diagram of the camera module shown is when focusing on a close-up view of 50mm;

[0076] Figure 4C yes Figure 4A The simulation effect diagram of the telephoto lens when focusing on the distant scene is shown;

[0077] Figure 4D yes Figure 4B The simulation effect of the telephoto lens when focusing on a close-up of 50mm is shown;

[0078] Figure 5A is a schematic diagram of the optical path when the camera module focuses on a distant view in the second embodiment provided by the present application;

[0079] Figure 5B yes Figure 5A The optical path diagram of the camera module shown is when focusing on a close-up view of 50mm;

[0080] Figure 5C yes Figure 5A The simulation effect diagram of the telephoto lens when focusing on the distant scene is shown;

[0081] Figure 5D yes Figure 5B The simulation effect of the telephoto lens when focusing on a close-up of 50mm is shown;

[0082] Fig. 6A is a schematic diagram of the optical path when the camera module focuses on a distant view in the third embodiment provided by the present application;

[0083] Figure 6B yes Fig. 6A The optical path diagram of the camera module shown is when focusing on a close-up view of 50mm;

[0084] Figure 6C yes Fig. 6A The simulation effect diagram of the telephoto lens when focusing on the distant scene is shown;

[0085] Fig.6D yes Figure 6B The simulation effect of the telephoto lens when focusing on a close-up of 50mm is shown;

[0086] Fig. 7A is a schematic diagram of the optical path when the camera module focuses on a distant view in the fourth embodiment provided by the present application;

[0087] Figure 7B yes Fig. 7A The optical path diagram of the camera module shown is when focusing on a close-up view of 50mm;

[0088] Figure 7C yes Fig. 7A The simulation effect diagram of the telephoto lens when focusing on the distant scene is shown;

[0089] Fig.7D yes Figure 7B The simulation effect of the telephoto lens when focusing on a close-up of 50mm is shown;

[0090] Fig. 8A is a schematic diagram of the optical path when the camera module focuses on a distant view in the fifth embodiment provided by the present application;

[0091] Figure 8B yes Fig. 8A The optical path diagram of the camera module shown is when focusing on a close-up view of 50mm;

[0092] Figure 8C yes Fig. 8A The simulation effect diagram of the telephoto lens when focusing on the distant scene is shown;

[0093] Fig.8D yes Figure 8B The simulation effect of the telephoto lens when focusing on a close-up of 50mm is shown;

[0094] Fig. 9A is a schematic diagram of the optical path when the camera module focuses on a distant view in the sixth embodiment provided by the present application;

[0095] Fig. 9B yes Fig. 9A The optical path diagram of the camera module shown is when focusing on a close-up view of 50mm;

[0096] Fig. 9C yes Fig. 9A The simulation effect diagram of the telephoto lens when focusing on the distant scene is shown;

[0097] Fig.9D yes Fig. 9B The simulation effect of the telephoto lens when focusing on a close-up of 50mm is shown;

[0098] Fig. 10A is a schematic diagram of the optical path when the camera module focuses on a distant view in the seventh embodiment provided by the present application;

[0099] Fig. 10B yes Fig. 10A The optical path diagram of the camera module shown is when focusing on a close-up view of 50mm;

[0100] Fig. 10C yes Fig. 10A The simulation effect diagram of the telephoto lens when focusing on the distant scene is shown;

[0101] Fig. 10D yes Fig. 10B The simulation effect of the telephoto lens when focusing on a close-up of 50mm is shown;

[0102] Fig.11A is a schematic diagram of the optical path when the camera module focuses on a distant view in the eighth embodiment provided by the present application;

[0103] Fig. 11B yes Fig.11A The optical path diagram of the camera module shown is when focusing on a close-up view of 50mm;

[0104] Fig. 11C yes Fig.11A The simulation effect diagram of the telephoto lens when focusing on the distant scene is shown;

[0105] Fig.11D yes Fig. 11B The simulation effect of a telephoto lens when focusing on a close-up of 50mm is shown. DETAILED DESCRIPTION

[0106] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0107] Focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam. It characterizes the ability of an optical system to deflect light.

[0108] A lens or lens group with positive optical power has a positive focal length and has the effect of converging light.

[0109] A lens or lens group with negative optical power has a negative focal length and has the effect of diverging light.

[0110] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical system. It refers to the vertical distance from the optical center of a lens or lens group to the focal plane of the image side when an infinitely distant scene forms a clear image on the focal plane of the image side through a lens or lens group. From a practical point of view, it can be understood as the distance from the center of the lens to the plane when the object is infinitely far away. For a fixed-focus lens, the position of its optical center is fixed; for a telephoto lens, the change of the optical center of the lens brings about a change in the focal length of the lens.

[0111] The effective focal length (EFL) of a lens refers to the distance from the center of the lens to the focus.

[0112] The object side is bounded by the lens. The side where the object is located is called the object side, and the surface of the lens close to the object side is called the object side.

[0113] The image side is bounded by the lens. The side where the image of the object is located is called the image side, and the surface of the lens close to the image side is called the image side.

[0114] Object distance is the distance from the object to the object side of the lens.

[0115] The aperture diaphragm is a device used to control the amount of light that passes through the lens and enters the photosensitive surface inside the camera body. It is usually inside the lens.

[0116] Aperture value, also known as F number (Fno), is the relative value obtained by dividing the focal length of the lens by the diameter of the lens entrance pupil (the inverse of the relative aperture). The smaller the aperture value, the more light enters in the same unit time. The larger the aperture value, the smaller the depth of field, and the background content of the photo will be blurred, similar to the effect of a telephoto lens.

[0117] Total track length (TTL) refers to the total length from the surface of the lens closest to the object side to the imaging surface. TTL is the main factor affecting the height of the camera.

[0118] The imaging plane is located on the image side of all lenses in the telephoto lens, and is the plane on which the image is formed after light passes through each lens in the telephoto lens in sequence.

[0119] Field of view (FOV), also known as field of view, is the angle formed by the two edges of the maximum range of the image of the object that can pass through the lens, with the lens of the optical instrument as the vertex.

[0120] The optical axis is an axis that passes vertically through the center of the lens. The optical axis of the lens is the axis that passes through the center of each lens of the lens. When light parallel to the optical axis enters a convex lens, the ideal convex lens should have all the light converge at one point behind the lens. This point where all the light converges is the focus.

[0121] Focus is the point where parallel light rays converge after being refracted by a lens or lens group.

[0122] The image focal plane, also called the back focal plane or the second focal plane, is a plane passing through the image focus (also called the back focus or the second focus) and perpendicular to the optical axis of the system.

[0123] The Abbe number, or dispersion coefficient, is the difference ratio of the refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0124] Aberration: The paraxial region of the optical system has the properties of an ideal optical system. The paraxial light emitted from a point on the object intersects the image plane at one point (also known as the paraxial image point). However, the light that actually passes through different apertures of the lens is difficult to intersect perfectly at one point, but has a certain deviation from the position of the paraxial image point. These differences are collectively called aberrations.

[0125] Axial chromatic aberration (longitudinal spherical aberration), also known as longitudinal chromatic aberration or position chromatic aberration or axial aberration, is a beam of light parallel to the optical axis that converges at different positions before and after passing through the lens. This aberration is called position chromatic aberration or axial chromatic aberration. This is because the positions of the images of the light of each wavelength are different, so that the focal planes of the image side of the light of different colors cannot overlap when the final image is formed, and the complex light spreads out to form dispersion.

[0126] Distortion, also known as distortion, is the degree of distortion of the image formed by the optical system relative to the object itself. Distortion is due to the influence of aperture spherical aberration. The height of the intersection of the main light of different fields of view with the Gaussian image plane after passing through the optical system is not equal to the ideal image height. The difference between the two is the distortion. Therefore, distortion only changes the imaging position of the off-axis object point on the ideal plane, causing the shape of the image to be distorted, but does not affect the clarity of the image.

[0127] Image height (ImgH) refers to half of the diagonal length of the effective pixel area on the photosensitive chip, that is, the image height of the imaging surface.

[0128] Astigmatism, because the object point is not on the optical axis of the optical system, the light beam it emits has an inclination angle with the optical axis. After the light beam is refracted by the lens, the convergence point of its meridional beamlet and sagittal beamlet is not at the same point. That is, the light beam cannot be focused on one point, and the image is not clear, so astigmatism occurs. Meridian beamlet and sagittal beamlet are the names of light beams in two perpendicular planes in a rotationally symmetric optical system.

[0129] Field curvature is used to indicate the difference between the clearest image point position of the non-central field of view light after passing through the optical lens group and the clearest image point position of the central field of view on the optical axis. When the lens has field curvature, the intersection point of the entire light beam does not coincide with the ideal image point. Although a clear image point can be obtained at each specific point, the entire image plane is a curved surface.

[0130] The technical solution in the embodiment of the present application will be described below in conjunction with the accompanying drawings. In the description of the embodiment of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiment of the present application, "multiple" means two or more than two.

[0131] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0132] The embodiment of the present application provides an electronic device. The electronic device may be a mobile phone, a tablet, a laptop computer, a television, a vehicle-mounted device, a wearable device, a video surveillance device, or other electronic product with a photo or video recording function. The wearable device may be a smart bracelet, a smart watch, a wireless headset, augmented reality (AR) glasses, an augmented reality helmet, virtual reality (VR) glasses, and a virtual reality helmet. The embodiment of the present application is described by taking the electronic device as a mobile phone as an example.

[0133] See also Figure 1A , Figure 1A It is a schematic diagram of the structure of the electronic device 100 provided in some embodiments of the present application.

[0134] like Figure 1AAs shown, in some embodiments, the electronic device 100 includes a camera module 10, an image processor 20, a back cover 30, a frame 40 and a display screen (not shown in the figure). The back cover 30 and the display screen are fixed on both sides of the frame 40 in reverse, and the back cover 30, the display screen and the frame 40 together surround the entire inner cavity of the electronic device 100. Among them, the display screen can be used to display images, and can also integrate touch functions to achieve human-computer interaction. The camera module 10 is accommodated in the inner cavity of the whole machine, and the camera module 10 is used to collect optical information outside the electronic device 100 and form a corresponding image signal. The image processor 20 is connected to the camera module 10 in communication, and the image processor 20 is used to obtain image signals from the camera module 10 and process image signals. Among them, the communication connection between the camera module 10 and the image processor 20 can include data transmission through electrical connection methods such as wiring, and data transmission can also be achieved through coupling and other methods. It can be understood that the camera module 10 and the image processor 20 can also be communicated and connected by other methods that can achieve data transmission.

[0135] In this embodiment, the back cover 30 may be provided with a camera hole 31, and the camera module 10 collects light through the camera hole 31, and the camera module 10 may be used as a rear camera of the electronic device 100. Exemplarily, the back cover 30 may include a light-transmitting lens, which is mounted on the camera hole 31 to allow light to pass through and is dustproof and waterproof.

[0136] In some other embodiments, the camera module 10 can also be used as a front camera of the electronic device 100. Exemplarily, the display screen can be provided with a light-transmitting area, and the camera module 10 can collect optical information outside the electronic device 100 through the light-transmitting area. In this embodiment, the camera module 10 is used as a front camera module of the electronic device 100. That is, the camera module 10 can be used as a front camera module of the electronic device 100, and can also be used as a rear camera module of the electronic device 100, and the embodiment of the present application does not strictly limit this.

[0137] For example, Figure 1A As shown, the camera module 10 of the electronic device 100 can be installed at the first end of the upper part of the electronic device 100. The first end and the second end of the upper part are respectively located at the left and right ends of the upper part. It can be understood that the directional terms such as "upper", "lower", "left", "right" and the like involved in this application are described with reference to the directions of the attached drawings, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of this application.

[0138] also, Figure 1AThe installation position of the camera module 10 of the electronic device 100 in the illustrated embodiment is merely illustrative, and the present application does not strictly limit the installation position of the camera module 10. In some other embodiments, the camera module 10 may also be installed at other positions of the electronic device 100, for example, the camera module 10 may be installed at the middle of the upper part or the second end of the upper part of the electronic device 100, or may be installed at the left end of the middle or lower part of the electronic device 100 or the right end of the lower part.

[0139] In some other embodiments, the electronic device 100 may also include a terminal body and an auxiliary component that can be rotated, moved or disassembled relative to the terminal body, and the camera module 10 may also be disposed on the auxiliary component.

[0140] In some embodiments, the electronic device 100 may further include an analog-to-digital converter (also referred to as an A / D converter, not shown in the figure). The analog-to-digital converter is connected between the camera module 10 and the image processor 20. The analog-to-digital converter is used to convert the analog image signal generated by the camera module 10 into a digital image signal and transmit it to the image processor 20, and then the image processor 20 processes the digital image signal to obtain a processed image signal, and the processed image signal can be displayed as an image or video on a display screen.

[0141] In some embodiments, the electronic device 100 may further include a memory (not shown in the figure), which is in communication with the image processor 20. The image processor 20 transmits the processed image signal to the memory, so that when the image needs to be viewed later, the processed image signal can be searched from the memory at any time and displayed on the display screen. In some embodiments, the image processor 20 also compresses the processed image signal and stores it in the memory to save memory space.

[0142] See also Figure 1B , Figure 1B yes Figure 1A The diagram shown is a schematic diagram of the field of view FOV of the camera module 10 in some application scenarios.

[0143] Exemplarily, the camera module 10 may include a first lens (not shown) and a second lens (not shown). Among them, the first lens can be used as a main camera lens. In the present application, the first lens corresponds to a 1x (i.e. 1 times) optical zoom multiple. The second lens may be a telephoto lens, and the second lens is a 3x (i.e. 3 times) optical zoom lens of the first lens, that is, the second lens corresponds to a 3x (i.e. 3 times) optical zoom multiple. It can be understood that optical zoom is mainly achieved by switching lenses with different optical zoom multiples in the camera module. The optical zoom multiple of a lens can indicate the optical zoom capability of the lens. The larger the optical zoom multiple, the farther the scene that can be photographed.

[0144] like Figure 1B As shown, when the camera module 10 performs long-range shooting, the second lens may be used, and the field of view FOV of the second lens may be 40°. In this embodiment, the field of view of the second lens is less than 60°. When the camera module 10 performs standard shooting, the first lens may be used, and the field of view of the first lens may be 80°. In this embodiment, the field of view of the first lens may be greater than 60° and less than 120°. When the camera module 10 performs close-up shooting, the second lens may also be used, and the field of view of the second lens may be 120°.

[0145] See also Figure 2 , Figure 2 yes Figure 1A The illustrated structure is a schematic diagram of the camera module 10 in some embodiments.

[0146] like Figure 2 As shown, in some embodiments, the camera module 10 includes a telephoto lens 1 and a photosensitive element 2. In this embodiment, the second lens of the camera module 10 may have the same structure as the telephoto lens 1. In some other embodiments, the second lens of the camera module 10 may also have other structures, which is not limited in this application. Figure 2 The structure within the middle dotted line is a schematic structure of the telephoto lens 1 in some embodiments. The telephoto lens 1 in the present application may also have other structures, and the drawings cannot be regarded as limiting the structure of the telephoto lens 1.

[0147] The photosensitive element 2 is located on the image side of the telephoto lens 1. The camera module 10 may also include a circuit board (not shown in the figure), and the photosensitive element 2 may be fixed to the circuit board. Light can pass through the telephoto lens 1 to illuminate the photosensitive element 2. Exemplarily, the working principle of the camera module 10 is as follows: the light reflected by the photographed scene generates an optical image through the telephoto lens 1 and is projected onto the photosensitive element 2. The photosensitive element 2 converts the optical image into an electrical signal, that is, an analog image signal and transmits it to the analog-to-digital converter, so as to be converted into a digital image signal through the analog-to-digital converter to the image processor 20.

[0148] The photosensitive element 2 (also called an image sensor) is a semiconductor chip, which contains hundreds of thousands to millions of photodiodes on its surface. When exposed to light, it will generate electric charge. The photosensitive element 2 can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). A charge coupled device is made of a highly sensitive semiconductor material and can convert light into electric charge. A charge coupled device is composed of many photosensitive units, usually in units of millions of pixels. When the surface of the charge coupled device is exposed to light, each photosensitive unit will reflect the charge on the component, and the signals generated by all the photosensitive units are added together to form a complete picture. Complementary metal oxide semiconductor devices mainly use semiconductors made of two elements, silicon and germanium, so that semiconductors with N (-charged) and P (+charged) levels coexist on the complementary metal oxide semiconductor device. The current generated by these two complementary effects can be recorded and interpreted into an image by the processing chip.

[0149] In some embodiments, the photosensitive element 2 can move on a plane perpendicular to the thickness direction of the camera module 10 or tilt relative to the thickness direction of the camera module 10 to achieve anti-shake. In this case, the photosensitive element 2 does not have the ability to move in a direction parallel to the thickness of the camera module 10, or has a weak stroke much smaller than the focus stroke to reduce the thickness of the module. In other embodiments, the photosensitive element 2 can also be a fixed component.

[0150] Among them, the telephoto lens 1 mainly uses the refraction principle of the lens to form an image, that is, the light of the scene passes through the telephoto lens 1, forms a clear image on the imaging surface, and the image of the scene is recorded by the photosensitive element 2 located on the imaging surface. Exemplarily, when the telephoto lens 1 focuses on an object with an object distance greater than 100 meters, that is, when it focuses on a distant view, the field of view FOV of the telephoto lens 1 is less than 60°, for example: the half field of view HFOV can satisfy: tan(HFOV)<0.5, that is, the field of view FOV can be 53°, or the field of view FOV can also be 45°, 50°, 54°, etc. In addition, the image height ImgH of the telephoto lens 1>2 mm, that is, the diagonal size of the photosensitive element of the telephoto lens 1 is greater than 4 mm, for example: the diagonal size of the photosensitive element of the telephoto lens 1 can be 5 mm, 6 mm or 8 mm, etc. In the present application, the telephoto lens 1 has a small field of view and a large panel size, so as to have a strong long-range shooting capability and high imaging quality in long-range shooting. Among them, the half field of view HFOV is half of the maximum field of view of the telephoto lens 1. In the present application, shooting with an object distance greater than 100 meters can be regarded as long-range shooting, and shooting with an object distance less than 10 centimeters can be regarded as close-range shooting. In addition, the closest focusing distance of the telephoto lens 1 is less than 10 centimeters to achieve macro shooting.

[0151] The telephoto lens 1 may be a vertical lens or a periscope lens. This embodiment is described by taking the telephoto lens 1 being a vertical lens as an example.

[0152] In some embodiments, the camera module 10 may further include a filter 3. The filter 3 may be located between the telephoto lens 1 and the photosensitive element 2, and is used to filter out unnecessary bands in the light, prevent the photosensitive element 2 from generating false colors or ripples, and improve its effective resolution and color reproduction. Exemplarily, the filter 3 may be an infrared filter. Among them, in this embodiment, the filter 3 is an independent component. In some other embodiments, the filter 3 may be eliminated, and the filtering may be achieved by surface treatment or material treatment of at least one optical element of the telephoto lens 1. The present application does not strictly limit the specific embodiments of the structural members or structures used to achieve filtering.

[0153] Please refer to Figure 3A and Figure 3B , Figure 3A yes Figure 2 The structure diagram of the camera module 10 in the storage state is shown in FIG. Figure 3B yes Figure 3A The structure diagram of the camera module 10 shown is in the pop-up state.

[0154] like Figure 3A As shown, the telephoto lens 1 can be moved to a storage state; Figure 3BAs shown, the telephoto lens 1 can be moved to a pop-up state. When the telephoto lens 1 is in the storage state, the first distance H1 between the telephoto lens 1 and the filter 3 is small. For example, the first distance H1 can be less than 1 mm, such as 0.1 mm, 0.5 mm, etc. When the telephoto lens 1 is in the storage state, the overall height of the camera module 10 is small, and it occupies a small space in the entire inner cavity of the electronic device 100, which is convenient for storage and can be better applied to thin electronic devices. In addition, a first distance H1 is set between the telephoto lens 1 and the filter 3 to avoid damage to the telephoto lens 1 and the filter 3 due to collision or scratching when the telephoto lens 1 is in the storage state, thereby extending the service life of the camera module 10. Among them, the first distance H1 needs to take into account factors such as focusing stroke, lens support margin and temperature influence. In some other embodiments, when the telephoto lens 1 is in the storage state, the telephoto lens 1 can also contact the filter 3, which is not limited in this application.

[0155] like Figure 3B As shown, when the telephoto lens 1 is in the pop-up state, the second distance H2 between the telephoto lens 1 and the filter 3 is greater than the first distance H1. At this time, the telephoto lens 1 can be in a long-range shooting state and realize the focus function. In this embodiment, the second distance H2 between the telephoto lens 1 and the filter 3 provides sufficient moving space for the telephoto lens 1, and the telephoto lens 1 can move relative to the photosensitive element 2 to realize the focus function.

[0156] In some embodiments, the telephoto lens 1 may include multiple single lenses, for example, five, six, seven, etc. The multiple single lenses are arranged at intervals. When the telephoto lens 1 moves from the stored state to the pop-up state, or from the pop-up state to the stored state, or when focusing in long-range shooting, the distance between the multiple single lenses of the telephoto lens 1 does not change, that is, the effective focal length EFL of the telephoto lens 1 remains unchanged.

[0157] Please refer to Figure 3B and Figure 3C , Figure 3C yes Figure 3A The structure diagram of the camera module 10 shown in another pop-up state, Figure 3B The camera module 10 is shown in a long-range shooting mode. Figure 3C The camera module 10 is shown in a close-up shooting mode. Figure 3B and Figure 3C The structure within the dotted line is a schematic structure of the first lens group G1 and the second lens group G2 of the telephoto lens 1 in some embodiments. The first lens group G1 and the second lens group G2 in the present application may also have other structures, and the drawings cannot be regarded as limiting the structures of the first lens group G1 and the second lens group G2.

[0158] When the camera module 10 is in the pop-up state, the focal length of the telephoto lens 1 can also change to achieve switching between the distant view and the near view.

[0159] In some embodiments, the telephoto lens 1 may include a first lens group G1 and a second lens group G2 arranged from the object side to the image side. Figure 3B and Figure 3C As shown, in the process of switching the focus of the telephoto lens 1 from a distant view to a near view, the distance H3 between the first lens group G1 and the second lens group G2 increases. Conversely, in the process of switching the focus of the telephoto lens 1 from a near view to a distant view, the distance H3 between the first lens group G1 and the second lens group G2 decreases. Therefore, in the process of switching the focus of the telephoto lens 1 between a distant view and a near view, the distance H3 between the first lens group G1 and the second lens group G2 changes.

[0160] In the present application, by changing the distance H3 between the first lens group G1 and the second lens group G2, the telephoto lens 1 can achieve long-distance shooting with high imaging quality, and also have strong close-up shooting capabilities to achieve wide object distance imaging from long-distance to close-up.

[0161] In addition, when the telephoto lens 1 switches from a distant view to a close view, the distance H3 between the first lens group G1 and the second lens group G2 increases, so that a higher close view imaging quality can be obtained. In some other embodiments, when the telephoto lens 1 switches from a distant view to a close view, the distance H3 between the first lens group G1 and the second lens group G2 may also decrease, and this application does not limit this.

[0162] In addition, the first lens group G1 has positive optical power and the second lens group G2 has negative optical power, so that the height of the telephoto lens 1 is less than the effective focal length EFL of the telephoto lens 1, so as to reduce the height of the telephoto lens 1, which is conducive to the miniaturization of the camera module 10.

[0163] In the present application, the telephoto lens 1 has a strong focusing capability at a wide object distance, and can not only shoot long-range shots, but also shoot close-range shots within 10 cm, and has high image clarity and high image quality. In addition, the telephoto lens 1 is also configured reasonably by the optical focal length of the first lens group G1 and the second lens group G2, so that the height of the telephoto lens 1 is relatively small, which is conducive to the miniaturization of the camera module 10.

[0164] In some embodiments, when the telephoto lens 1 switches from a distant view to a near view, the combined focal length of the first lens group G1 and the second lens group G2, that is, the effective focal length EFL of the telephoto lens 1 decreases. In some other embodiments, when the telephoto lens 1 switches from a distant view to a near view, the effective focal length EFL of the telephoto lens 1 may also increase.

[0165] In some embodiments, the thickness T1 of the first lens group G1, the thickness T2 of the second lens group G2, and the effective focal length EFL of the telephoto lens 1 satisfy: T1 + T2 < EFL. By setting T1 + T2 < EFL, the sum of the thickness T1 of the first lens group G1 and the thickness T2 of the second lens group G2 is relatively small, so that when the telephoto lens 1 is in the retracted state, the overall height of the camera module 10 is relatively small, and it occupies a relatively small space in the whole machine cavity of the electronic device 100, which is convenient for storage and can be better applied to thin electronic devices. For example: The thickness T1 of the first lens group G1, the thickness T2 of the second lens group G2, and the effective focal length EFL of the telephoto lens 1 may also satisfy: T1 + T2 = 0.5EFL, 0.6EFL, or 0.8EFL, etc. Or, the thickness T1 of the first lens group G1, the thickness T2 of the second lens group G2, and the effective focal length EFL of the telephoto lens 1 may also satisfy: T1 + T2 ≤ 0.6EFL, or, 0.6EFL < T1 + T2 ≤ 0.8EFL, or, 0.8EFL < T1 + T2 < EFL. In the present application, the thickness T1 of the first lens group G1 is the distance between the object side and the image side of the first lens group G1, and the thickness T2 of the second lens group G2 is the distance between the object side and the image side of the second lens group G2. By setting T1 + T2 ≤ 0.6EFL, the sum of the thickness T1 of the first lens group G1 and the thickness T2 of the second lens group G2 is even smaller, so that when the telephoto lens 1 is in the retracted state, the overall height of the camera module 10 is even smaller, and it occupies a relatively small space in the whole machine cavity of the electronic device 100, which is convenient for storage and can be better applied to thin electronic devices.

[0166] In some embodiments, the thickness T1 of the first lens group G1 and the focal length F1 of the first lens group G1 satisfy: 0.1 < T1 / F1 < 1. For example: The thickness T1 of the first lens group G1 and the focal length F1 of the first lens group G1 may also satisfy: T1 / F1 = 0.3, 0.5, or 0.9, etc. Or, the thickness T1 of the first lens group G1 and the focal length F1 of the first lens group G1 may also satisfy: 0.1 < T1 / F1 ≤ 0.3, or, 0.3 < T1 / F1 < 1. In this embodiment, by setting 0.1 < T1 / F1 ≤ 0.3, the thickness of the first lens group G1 is relatively small, so that the height of the telephoto lens 1 can be reduced, which is convenient for storage; and it is convenient for the movement of the first lens group G1, improving the imaging quality.

[0167] In the present application, multiple lenses of the first lens group G1 can be mounted on a first lens barrel (not shown in the figure), and multiple lenses of the second lens group G2 can be mounted on a second lens barrel (not shown in the figure). That is, multiple lenses of the first lens group G1 and multiple lenses of the second lens group G2 can be respectively mounted on two lens barrels, and the focal length F1 of the first lens group G1 and the focal length F2 of the second lens group G2 can be separately measured. Exemplarily, the focal length F1 of the first lens group G1, the focal length F2 of the second lens group G2, and the effective focal length EFL of the telephoto lens 1 can be respectively measured by a focal length measuring instrument.

[0168] In some embodiments, the thickness T2 of the second lens group G2 and the focal length F2 of the second lens group G2 satisfy: -1 < T2 / F2 < -0.1. In this embodiment, by setting -1 < T2 / F2 < -0.1, it is beneficial to make the second lens group G2 have a smaller thickness, thereby reducing the height of the telephoto lens 1 and facilitating storage; and facilitating the movement of the second lens group G2 to improve the imaging quality.

[0169] It can be understood that the limitation on the ratio range of the thickness T1 of the first lens group G1 and the focal length F1 of the first lens group G1, and the limitation on the ratio range of the thickness T2 of the second lens group G2 and the focal length F2 of the second lens group G2 can exist independently of each other or can be combined with each other. When the above ratio ranges are combined with each other, the telephoto lens 1 can obtain a smaller height, as well as better focusing ability and imaging quality.

[0170] In some embodiments, a single-group focusing method can be adopted to simplify the movement mode of the focusing structure and simplify the focusing method.

[0171] Exemplarily, as Figure 3B and Figure 3C shown, during the focusing process of the telephoto lens 1 switching from a long shot to a close-up, the first lens group G1 remains stationary, and the second lens group G2 moves along the optical axis O towards the image side to increase the distance H3 between the first lens group G1 and the second lens group G2. In this embodiment, the first lens group G1 remains stationary, and by moving the second lens group G2 for focusing, the movement mode of the focusing structure of the telephoto lens 1 can be simplified, thereby simplifying the focusing method.

[0172] In this embodiment, the distance between the first lens group G1 and the photosensitive element 2 remains unchanged, and the distance between the second lens group G2 and the photosensitive element 2 decreases. In the present application, when the telephoto lens 1 focuses on a long shot and a close-up, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 remains unchanged, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 decreases.

[0173] In some other embodiments, the first lens group G1 moves toward the object side along the optical axis O, and the second lens group G2 does not move, so as to increase the distance H3 between the first lens group G1 and the second lens group G2. In this embodiment, the first lens group G1 is located on the object side of the second lens group G2, which increases the movable optical path space, helps to reduce the light turning angle, reduce aberrations, and improve image quality. In addition, the second lens group G2 does not move, and focusing is performed by moving the first lens group G1, which can simplify the movement mode of the focusing structure of the telephoto lens 1, thereby simplifying the focusing method.

[0174] In this embodiment, the distance between the first lens group G1 and the photosensitive element 2 increases, and the distance between the second lens group G2 and the photosensitive element 2 remains unchanged. In this application, when the telephoto lens 1 focuses on the distant view and the near view, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 increases, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 remains unchanged.

[0175] In some other embodiments, a dual-group focusing method can be used to reduce the focus stroke of each of the first lens group G1 and the second lens group G2, and can also improve the movement accuracy of the first lens group G1 and the second lens group G2, thereby improving the focusing ability of the telephoto lens 1. Exemplarily, the first lens group G1 and the second lens group G2 can be moved along the optical axis O, as long as the distance H3 between the first lens group G1 and the second lens group G2 is increased. In this embodiment, the first lens group G1 and the second lens group G2 can both move, thereby reducing the focus stroke of each of the first lens group G1 and the second lens group G2, and can also improve the movement accuracy of the first lens group G1 and the second lens group G2, thereby improving the focusing ability of the telephoto lens 1. In addition, since both lens groups can move, the movable optical path space is further increased, which is more conducive to reducing the light turning angle, reducing aberrations, and further improving the imaging quality.

[0176] In this embodiment, the distances between the first lens group G1 and the second lens group G2 and the photosensitive element 2 are changed. In this application, when the telephoto lens 1 focuses on the distant view and the near view, the imaging plane falls on the photosensitive element 2, that is, the distances between the first lens group G1 and the second lens group G2 and the imaging plane are changed.

[0177] Exemplarily, the first lens group G1 and the second lens group G2 may move relative to the photosensitive element 2 in such a manner that the distance between the first lens group G1 and the photosensitive element 2 increases, and the distance between the second lens group G2 and the photosensitive element 2 decreases. In the present application, when the telephoto lens 1 focuses on a distant view or a near view, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 increases, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 decreases.

[0178] In some other embodiments, the moving manner of the first lens group G1 and the second lens group G2 relative to the photosensitive element 2 may also be that the distances between the first lens group G1 and the second lens group G2 and the photosensitive element 2 both increase, that is, the distances between the first lens group G1 and the second lens group G2 and the imaging surface of the telephoto lens 1 both increase. The present application does not make any limitation thereto.

[0179] In some embodiments, the distance H3 between the first lens group G1 and the second lens group G2 and the effective focal length EFL of the telephoto lens 1 satisfy: H3 < EFL, so that the telephoto lens 1 can achieve wide object distance shooting. For example, the distance H3 between the first lens group G1 and the second lens group G2 and the effective focal length EFL of the telephoto lens 1 may satisfy: H3 = 0.5EFL, 0.7EFL or 0.9EFL. Or, the distance H3 between the second lens group G2 may satisfy: H3 = 0.05 mm, 0.07 mm or 0.1 mm, etc. Or, the distance H3 between the first lens group G1 and the second lens group G2 and the effective focal length EFL of the telephoto lens 1 may satisfy: H3 < 0.9EFL or 0.05 mm < H3 < 0.9EFL. Among them, when the distance H3 between the first lens group G1 and the second lens group G2 and the effective focal length EFL of the telephoto lens 1 satisfy 0.5EFL < H3 < 0.9EFL, the effective focal length EFL of the telephoto lens 1 is smaller, and the light converging ability is stronger, which can be used for close-up shooting within 10 cm.

[0180] In some embodiments, the camera module 10 may further include a first driving mechanism (not shown in the figure). The first driving mechanism is connected to the telephoto lens 1 and is used to control the telephoto lens 1 to move in a direction close to or away from the photosensitive element 2, so as to realize the accommodation and ejection of the telephoto lens 1, and can also realize the long-distance focusing of the telephoto lens 1. The present application can achieve auto focus (AF) through the first driving mechanism.

[0181] Exemplarily, the first driving mechanism may adopt a focusing motor, such as a voice coil motor (VCM), a shape memory alloy motor, a piezo motor, and a stepper motor, etc. In some other embodiments, the first driving mechanism may also adopt a mechanism such as a spring that can undergo elastic deformation. Exemplarily, please refer to Figure 3A and Figure 3BWhen the telephoto lens 1 is in the pop-up state, the spring does not undergo elastic deformation or has a small elastic deformation and is in a natural state; when the telephoto lens 1 is in the stored state, the spring undergoes elastic deformation or the elastic deformation increases and is in a compressed state. When the telephoto lens 1 changes from the stored state to the pop-up state, the elastic deformation of the spring decreases or the spring returns to the natural state, thereby generating an elastic force, and the telephoto lens 1 is ejected from the stored state under the drive of the elastic force of the spring. In addition, the first driving mechanism may also adopt other structures, which are not limited in this application.

[0182] In some embodiments, the camera module 10 may further include a second driving mechanism (not shown), which is connected to the first lens group G1 and is used to control the movement of the first lens group G1 along the optical axis O to change the distance H3 between the first lens group G1 and the second lens group G2, thereby realizing the switching of the telephoto lens 1 between the long-range mode and the close-range mode.

[0183] Exemplarily, the second driving mechanism may adopt a focus motor, such as a voice coil motor, a memory metal motor, a ceramic motor, and a stepping motor, etc. In addition, the second driving mechanism may also adopt other structures, which are not limited in the present application.

[0184] In some embodiments, the camera module 10 may further include a third driving mechanism (not shown), which is connected to the second lens group G2 and is used to control the movement of the second lens group G2 along the optical axis O to change the distance H3 between the first lens group G1 and the second lens group G2, thereby realizing the switching of the telephoto lens 1 between the long-range mode and the close-range mode.

[0185] Exemplarily, the third driving mechanism may adopt a focus motor, such as a voice coil motor, a memory metal motor, a ceramic motor, a stepping motor, etc. In addition, the third driving mechanism may also adopt other structures, which are not limited in the present application.

[0186] In some embodiments, the camera module 10 may further include a second driving mechanism and a third driving mechanism, wherein the second driving mechanism is connected to the first lens group G1 and is used to control the first lens group G1 to move along the optical axis O, and the third driving mechanism is connected to the second lens group G2 and is used to control the second lens group G2 to move along the optical axis O, so as to change the distance H3 between the first lens group G1 and the second lens group G2, and realize the switching of the telephoto lens 1 between the long-view mode and the short-view mode. In this embodiment, the first lens group G1 and the second lens group G2 are driven to move by two driving mechanisms respectively, so that the focusing strokes of the first lens group G1 and the second lens group G2 can be reduced, and the movement accuracy of the first lens group G1 and the second lens group G2 can be improved, thereby improving the focusing ability of the telephoto lens 1.

[0187] Exemplarily, the second drive mechanism may adopt a focus motor, such as a voice coil motor, a memory metal motor, a ceramic motor, and a stepper motor. The third drive mechanism may adopt a focus motor, such as a voice coil motor, a memory metal motor, a ceramic motor, and a stepper motor. In addition, the second drive mechanism and / or the third drive mechanism may also adopt other structures, which is not limited in this application. In this embodiment, the structures of the second drive mechanism and the third drive mechanism may be the same or different, which is not limited in this application.

[0188] In some embodiments, the camera module 10 may further include a first driving mechanism and a second driving mechanism and / or a third driving mechanism. The first driving mechanism is connected to the telephoto lens 1, and is used to control the telephoto lens 1 to move in a direction close to or away from the photosensitive element 2, so as to achieve the storage and pop-up of the telephoto lens 1, and also to achieve the telephoto focus of the telephoto lens 1. The second driving mechanism is connected to the first lens group G1, and is used to control the first lens group G1 to move along the optical axis O. The third driving mechanism is connected to the second lens group G2, and is used to control the second lens group G2 to move along the optical axis O, so as to change the distance H3 between the first lens group G1 and the second lens group G2, so as to achieve the switching of the telephoto lens 1 between the telephoto mode and the close-up mode.

[0189] Exemplarily, the first drive mechanism may adopt a focus motor, such as a voice coil motor, a memory metal motor, a ceramic motor, and a stepper motor. The second drive mechanism may adopt a focus motor, such as a voice coil motor, a memory metal motor, a ceramic motor, and a stepper motor. The third drive mechanism may adopt a focus motor, such as a voice coil motor, a memory metal motor, a ceramic motor, and a stepper motor. In addition, one, two, or three of the first drive mechanism, the second drive mechanism, and the third drive mechanism may also adopt other structures, which is not limited in this application. In this embodiment, the structures of the first drive mechanism, the second drive mechanism, and the third drive mechanism may be the same, and at least one of the first drive mechanism, the second drive mechanism, and the third drive mechanism may have a structure different from that of the other mechanisms, which is not limited in this application.

[0190] In some embodiments, the camera module 10 may further include an anti-shake motor (not shown). The anti-shake motor is used to drive the telephoto lens 1 to move in a direction perpendicular to the optical axis O, or to tilt and rotate relative to the optical axis O. The anti-shake motor may be a shape memory alloy motor, a suspension wire motor, a ball bearing motor, etc.

[0191] In some embodiments, the focal length F1 of the first lens group G1 and the effective focal length EFL of the telephoto lens 1 satisfy: F1 < EFL. By setting F1 < EFL, the focal length of the first lens group G1 is relatively small, and its light converging ability is relatively strong, enabling the telephoto lens 1 to be used for taking close-up shots within 10 cm. The first lens group G1 has a positive focal power, that is, the focal length F1 of the first lens group G1 is greater than 0. In some other embodiments, the focal length F1 of the first lens group G1 and the effective focal length EFL of the telephoto lens 1 may also satisfy: F1 ≤ 0.9EFL. Then, the focal length of the first lens group G1 is relatively small, and its light converging ability is relatively strong, enabling the telephoto lens 1 to be used for taking close-up shots within 10 cm. In addition, the focal length F1 of the first lens group G1 and the effective focal length EFL of the telephoto lens 1 may also satisfy: 0.9EFL < F1 < EFL, and the present application does not limit this.

[0192] In addition, the focal length F1 of the first lens group G1 is less than the effective focal length EFL of the telephoto lens 1, and the second lens group G2 with a negative focal power can extend the focal length F1 of the first lens group G1, so that the combined focal length of the first lens group G1 and the second lens group G2, that is, the effective focal length EFL of the telephoto lens 1, is greater than the focal length F1 of the first lens group G1.

[0193] In this embodiment, the focal length F2 of the second lens group G2 and the effective focal length EFL of the telephoto lens 1 may satisfy: -EFL < F2. In this embodiment, the second lens group G2 has a negative focal power, that is, the focal length F2 of the second lens group G2 is less than 0. In addition, by setting -EFL < F2, the thickness T2 of the second lens group G2 can be reduced, thereby reducing the height of the telephoto lens 1, facilitating storage; and making the focal length of the second lens group G2 relatively small, with a relatively strong light converging ability, facilitating focusing and reducing the motor travel. In addition, the small thickness T2 of the second lens group G2 can reduce the height of the telephoto lens 1, which is beneficial to the miniaturization of the camera module 10.

[0194] In some other embodiments, the focal length F2 of the second lens group G2 and the effective focal length EFL of the telephoto lens 1 may also satisfy: F2 < -EFL, and the present application does not limit this.

[0195] In some embodiments, the focal length F1 of the first lens group G1 and the focal length F2 of the second lens group G2 may satisfy: 1 < (F1 - F2) / F1 < 9 to improve the focusing ability and imaging quality of the telephoto lens 1. For example: the focal length F1 of the first lens group G1 and the focal length F2 of the second lens group G2 may satisfy: (F1 - F2) / F1 = 1.1, 2, or 3, etc. Or, the focal length F1 of the first lens group G1 and the focal length F2 of the second lens group G2 may satisfy: 1 < (F1 - F2) / F1 ≤ 3, or, 3 < (F1 - F2) / F1 < 9, or, 1.1 < (F1 - F2) / F1 < 9.

[0196] Understandably, when the focal lengths of both lens groups are relatively small, and the difference between the focal lengths of the two lens groups is small, that is, the value of (F1-F2) / F1 is small, the telephoto lens 1 will be able to enhance its ability to converge light, which is beneficial to close-range imaging; however, the degree of light deflection by the telephoto lens 1 will be increased, increasing aberrations, and the imaging may be unclear and the imaging quality will be poor. When the focal length F2 of the second lens group G2 is relatively large, and is significantly different from the focal length F1 of the first lens group G1, that is, the value of (F1-F2) / F1 is large, the telephoto lens 1 will be able to converge light, which is not beneficial to close-range imaging; however, the degree of light deflection by the telephoto lens 1 will be reduced, reducing aberrations and improving imaging quality. Therefore, the focal lengths of the two lens groups can be designed according to the needs of the actual application scenario.

[0197] It is understandable that the above-mentioned limitation on the ratio range of the focal length F1 of the first lens group G1 to the focal length F2 of the second lens group G2, and the limitation on the ratio range of the focal length F1 of the first lens group G1 to the focal length F2 of the second lens group G2 to the effective focal length EFL of the telephoto lens 1 can exist independently of each other, or can be combined with each other. When the above-mentioned three ratio ranges are combined with each other, the telephoto lens 1 can obtain a smaller size, and better focusing ability and imaging quality.

[0198] In some embodiments, the first lens group G1 includes at least two lenses to improve the specifications of the telephoto lens 1 and enhance the imaging quality. Exemplarily, the first lens group G1 may include two to four lenses, such as three or four lenses. The first lens group G1 includes at least one lens with positive optical power.

[0199] In some embodiments, the second lens group G2 may also include multiple lenses to improve the specifications of the telephoto lens 1 and enhance the imaging quality. Exemplarily, the second lens group G2 may include two to four lenses. For example, two, three, four, etc. In some other embodiments, the second lens group G2 may also include one lens, which is not limited in the present application. Exemplarily, the second lens group G2 includes at least one lens with negative optical power.

[0200] In some embodiments, the telephoto lens 1 may include four to eight lenses, for example, five, six, or seven lenses.

[0201] In this application, by adjusting the number of lenses in the first lens group G1 and the second lens group G2, different specifications of designs can be obtained to adapt to diverse application scenarios. Exemplarily, if the number of lenses in the first lens group G1 and the second lens group G2 is large, the specification of the telephoto lens 1 is high and the imaging quality is high, but the design difficulty of each lens in the first lens group G1 and the second lens group G2 is increased; if the number of lenses in the first lens group G1 and the second lens group G2 is small, the design difficulty of each lens in the first lens group G1 and the second lens group G2 is low, but the specification of the telephoto lens 1 is low and the imaging quality is poor. Different numbers of lenses can be selected according to different requirements.

[0202] Exemplarily, as Figure 3C shown, the first lens group G1 may include a first lens L11 and a second lens L12 arranged from the object side to the image side. The sum of the Abbe number of the first lens L11 and the Abbe number of the second lens L12 may be greater than 20, which is beneficial to the chromatic aberration correction of the telephoto lens 1.

[0203] Exemplarily, the sum of the Abbe numbers of each lens in the second lens group G2 may be greater than 18, which is beneficial to the chromatic aberration correction of the telephoto lens 1.

[0204] Exemplarily, as Figure 3C shown, the second lens group G2 may include a first lens L21 close to the object side. The focal length f11 of the first lens L11 of the first lens group G1 and the focal length F1 of the first lens group G1 may satisfy: f11 / F1 < 1; and the first lens L21 of the second lens group G2 and the focal length F2 of the second lens group G2 may satisfy: f21 / F2 < 1. For example: the focal length f11 of the first lens L11 of the first lens group G1 and the focal length F1 of the first lens group G1 may satisfy: f11 / F1 = 0.5, 0.6 or 0.8, etc., and the first lens L21 of the second lens group G2 and the focal length F2 of the second lens group G2 may satisfy: f21 / F2 = 0.2, 0.4 or 0.5, etc.

[0205] Alternatively, the focal length f11 of the first lens L11 of the first lens group G1 and the focal length F1 of the first lens group G1 may also satisfy: 0.5 < f11 / F1 < 1. In this application, the first lens L11 of the first lens group G1 generally serves as the main lens, and other lenses are added to form a lens group, so that through the adjustment of other lenses based on the first lens L11, the first lens group G1 can obtain the required optical performance. By designing 0.5 < f11 / F1 < 1, the difference between the focal length f11 of the first lens L11 of the first lens group G1 and the focal length F1 of the first lens group G1 is small, which is convenient for adjusting the focal length f11 of the first lens L11 to obtain the focal length F1 of the first lens group G1.

[0206] In some embodiments, the focal length f21 of the first lens L21 of the second lens group G2 and the focal length F2 of the second lens group G2 may also satisfy: 0.2 < f21 / F2 < 1. In the present application, the first lens L21 of the second lens group G2 generally serves as the main lens, and other lenses are added to form a lens group, so that the required optical performance of the second lens group G2 can be obtained by adjusting with other lenses on the basis of the first lens L21. By designing 0.2 < f21 / F1 < 1, the difference between the focal length f21 of the first lens L21 of the second lens group G2 and the focal length F2 of the second lens group G2 is small, which is convenient for adjusting the focal length f21 of the first lens L21 to obtain the focal length F2 of the second lens group G2.

[0207] Exemplarily, multiple lenses of the first lens group G1 may be made of the same material, such as glass, resin, etc. Among them, glass has high refractive index and low expansion characteristics, making the telephoto lens 1 have better imaging quality and low temperature drift characteristics. The resin has low density, which can reduce the weight of the lens group, facilitate movement, and improve the focusing ability of the telephoto lens 1. In some other embodiments, at least one lens among the multiple lenses of the first lens group G1 may have a different material from other lenses, and the present application does not limit this.

[0208] Exemplarily, one lens among the multiple lenses of the first lens group G1 may be made of glass. For example, the first lens L11 of the first lens group G1 may be made of glass, and other lenses may be made of resin, so that both the imaging quality and low temperature drift characteristics of the telephoto lens 1 can be ensured, and the weight of the lens group can be reduced, and the focusing ability of the telephoto lens 1 can be improved.

[0209] Exemplarily, the multiple lenses of the first lens group G1 may be processed and formed by processes such as injection molding, molding, and / or polishing and grinding.

[0210] Exemplarily, multiple lenses of the second lens group G2 may be made of the same material, such as glass, resin, etc. In some other embodiments, at least one lens among the multiple lenses of the second lens group G2 may have a different material from other lenses, and the present application does not limit this.

[0211] Exemplarily, one lens among the multiple lenses of the second lens group G2 may also be made of glass. For example, the first lens L21 of the second lens group G2 may be made of glass, and other lenses may be made of resin, so that both the imaging quality and low temperature drift characteristics of the telephoto lens 1 can be ensured, and the weight of the lens group can be reduced, and the focusing ability of the telephoto lens 1 can be improved.

[0212] Exemplarily, the multiple lenses of the second lens group G2 may be processed and formed by processes such as injection molding, molding, and / or polishing and grinding.

[0213] In some embodiments, such as Figure 3C As shown, the telephoto lens 1 may further include an aperture stop 4, and the aperture stop 4 may be installed on the first lens group G1. In this case, the aperture adjustment effect of the aperture stop 4 is better, which can improve the imaging quality of the telephoto lens 1. For example, the aperture stop 4 may be installed on one end of the first lens group G1 close to the object side. In this embodiment, the aperture stop 4 is installed on the first lens L11 of the first lens group G1 as an example for illustration. In some other embodiments, the aperture stop 4 may also be installed on other lenses of the first lens group G1, the second lens group G2 or other positions of the telephoto lens 1, and this embodiment of the present application does not strictly limit this.

[0214] The aperture stop 4 may be a spacer ring structure or a variable fan blade structure; or, the aperture stop 4 may be realized by a surface spraying process, for example, by spraying a light-shielding material on a lens to form the aperture stop 4. The position of the aperture stop 4 may be fixed or variable. For example, the position of the aperture stop 4 is variable, and the aperture stop 4 may be adjusted according to the focusing condition to be located between different lenses.

[0215] In some embodiments, the optical surface of at least one lens of the telephoto lens 1 is an aspherical surface, and the optical surface of the aspherical shape has different optical powers from the paraxial to the outer field of view area, so that the image quality of the image is more balanced. And / or, the optical surface of at least one lens of the telephoto lens 1 can be a free-form surface to correct aberrations. Among them, the aspherical surface is a surface that is rotationally symmetrical around the optical axis O; the free-form surface can have no symmetry axis, or can be symmetrical along a certain direction, or can be symmetrical along two directions.

[0216] In some embodiments, multiple lenses of the telephoto lens 1 are assembled through an active alignment (AA) process to ensure assembly accuracy.

[0217] In some embodiments, a diffraction grating structure may be formed on the optical surface of at least one lens of the telephoto lens 1. In this embodiment, by properly setting the diffraction grating structure, chromatic aberration can be reduced and the volume of the telephoto lens 1 can also be reduced.

[0218] In some embodiments, the telephoto lens 1 may further include a liquid lens (not shown), which may be located between the first lens group G1 and the second lens group G2. In this embodiment, the liquid lens may be used to enhance the focusing effect to achieve ultra-close-up photography. The liquid lens is a structural component that uses liquid as a lens and changes the focal length by changing the curvature of the liquid.

[0219] In some embodiments, at least one lens of the telephoto lens 1 may adopt a special-shaped technology to reduce the size of the telephoto lens 1, so that the telephoto lens 1 can be better adapted to miniaturized electronic devices 100, thereby increasing the scope of application of the telephoto lens 1. The cutout may be implemented by an I-CUT process. In addition, since the height of the lens is reduced by cutting, the lens may be provided with a larger aperture, thereby increasing the amount of light transmitted by the telephoto lens 1, so that the imaging quality of the telephoto lens 1 is better. Among them, the special-shaped technology may also be adopted on the structural support members of the lens such as the lens barrel and the spacer to reduce the size of the telephoto lens 1.

[0220] In some embodiments, the peripheral side surface or supporting surface of at least one lens of the telephoto lens 1 can be blackened or roughened to eliminate stray light and improve the image quality. The blackening treatment can be coated or plated with a matte material such as black ink, or it can be a film. The roughening treatment is mainly used to increase the roughness. Of course, in some other embodiments, the telephoto lens 1 can also eliminate stray light by other means, and the embodiments of the present application are not strictly limited to this.

[0221] Illustratively, the present application provides eight possible embodiments of the camera module 10 .

[0222] Among them, in the first to fourth embodiments, the telephoto lens 1 includes seven lenses. The number of lenses is large, so the specification of the telephoto lens 1 is high and the imaging quality is high.

[0223] In the first and second embodiments, the first lens group G1 of the telephoto lens 1 includes three lenses. In the third and fourth embodiments, the first lens group G1 of the telephoto lens 1 includes four lenses. In the first and second embodiments, the first lens L1 closest to the object side of the three lenses of the first lens group G1 is the main lens, and the second lens L2 and the third lens L3 of the three lenses of the first lens group G1 are used to adjust the parameters such as the focal length of the first lens L1 so that the first lens group G1 obtains the preset optical performance. The first lens group G1 adjusts the main lens through two lenses, the optical path is simple, the design difficulty of each lens is low, and the thickness of the lens to be adjusted is large, which is conducive to processing; in addition, the thickness TI of the first lens group G1 is small, and the height of the telephoto lens 1 is small, which is convenient for storage.

[0224] In the first and third embodiments, focusing is performed by moving the first lens group G1 and fixing the second lens group G2, so that when focusing on a close-up view, the object side of the telephoto lens 1 is closer to the subject, the degree of light deflection is small, aberrations are reduced, and imaging quality is improved. In the second and fourth embodiments, focusing is performed by moving the second lens group G2 and fixing the first lens group G1.

[0225] In the fifth and sixth embodiments, the telephoto lens 1 includes six lenses, and the first lens group G1 of the telephoto lens 1 includes three lenses. In the fifth embodiment, focusing is performed by moving the first lens group G1 and fixing the second lens group G2. In the sixth embodiment, focusing is performed by moving the second lens group G2 and fixing the first lens group G1.

[0226] In the seventh and eighth embodiments, the telephoto lens 1 includes five lenses, and the first lens group G1 of the telephoto lens 1 includes three lenses. In the seventh embodiment, focusing is performed by moving the first lens group G1 and fixing the second lens group G2. In the eighth embodiment, focusing is performed by moving the second lens group G2 and fixing the first lens group G1.

[0227] The following describes the specific structure of the camera module 10 in various possible embodiments in conjunction with the accompanying drawings and tables.

[0228] Please refer to Figure 4A and Figure 4B , Figure 4A is a schematic diagram of the optical path when the camera module 10 is focused on a distant view in the first embodiment provided by the present application, Figure 4B yes Figure 4A The illustrated diagram is a light path diagram of the camera module 10 when focusing on a close-up view of 50 mm. Figure 4A The camera module 10 shown includes Figure 3B Most of the technical features of the camera module 10 are shown. The following mainly describes the differences between the two, and most of the same contents between the two are not repeated.

[0229] In the first embodiment, the telephoto lens 1 includes seven lenses. In addition, the first lens group G1 includes three lenses. Focusing is performed by moving the first lens group G1 and fixing the second lens group G2.

[0230] Specifically, in the first embodiment, the camera module 10 includes a telephoto lens 1, a filter 3 and a photosensitive element 2. The telephoto lens 1 includes a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The first lens group G1 has positive focal power, and the second lens group G2 has negative focal power. During the focusing process of the telephoto lens 1 switching between a distant view and a near view, the distance H3 between the first lens group G1 and the second lens group G2 changes.

[0231] In this embodiment, the first lens group G1 of the telephoto lens 1 includes a first lens L1, a second lens L2 and a third lens L3 arranged from the object side to the image side, and the second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 arranged from the object side to the image side. Along the direction of the optical axis O, the light passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 in sequence, and then passes through the filter 3, and finally reaches the photosensitive element 2.

[0232] In the first embodiment, the telephoto lens 1 includes seven lenses. The larger the number of lenses, the higher the specification and the image quality of the telephoto lens 1. In addition, the first lens L1 closest to the object side of the three lenses of the first lens group G1 is the main lens, and the second lens L2 and the third lens L3 of the three lenses of the first lens group G1 are used to adjust the parameters such as the focal length of the first lens L1, so that the first lens group G1 obtains the preset optical performance. In this embodiment, the first lens group G1 adjusts the main lens through two lenses, the optical path is simple, the design difficulty of each lens is low, and the thickness of the lens to be adjusted is large, which is conducive to processing; in addition, the thickness TI of the first lens group G1 is small, and the height of the telephoto lens 1 is small, which is convenient for storage.

[0233] like Figure 4A As shown, when the telephoto lens 1 focuses on the distant view, the light reflected by the distant view object passes through the telephoto lens 1 and forms an image on the imaging surface, and the imaging surface falls on the photosensitive element 2, and the camera module 10 can capture the distant view image. Figure 4B As shown, when the telephoto lens 1 focuses on the near-field, the first lens group G1 moves toward the object side along the optical axis O, and the light reflected by the near-field object passes through the telephoto lens 1 and is imaged on the imaging surface, and the imaging surface falls on the photosensitive element 2, so that the camera module 10 can capture near-field images.

[0234] like Figure 4A and Figure 4B As shown, during the focusing process of the telephoto lens 1 switching from the distant view to the near view, the first lens group G1 moves toward the object side along the optical axis O, the second lens group G2 does not move, the distance H3 between the first lens group G1 and the second lens group G2 increases, and the effective focal length EFL of the telephoto lens 1 decreases. In addition, the distance between the first lens group G1 and the photosensitive element 2 increases, and the distance between the second lens group G2 and the photosensitive element 2 remains unchanged. In the present application, when the telephoto lens 1 focuses on the distant view and the near view, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 increases, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 remains unchanged.

[0235] In the first embodiment, focusing is performed by moving the first lens group G1 and fixing the second lens group G2, so that when focusing on a close scene, the object side of the telephoto lens 1 is closer to the subject, the degree of deflection of light is small, the aberration is reduced, and the imaging quality is improved.

[0236] The following combines data and simulation results to present Figure 4A The telephoto lens 1 is shown as a concrete solution in a possible embodiment.

[0237] Please refer to Table 1a and Table 1b, where Table 1a is Figure 4A The curvature radius, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 of the telephoto lens 1 in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface located between the filter 3 and the photosensitive element 2, which is used to examine whether the light spot converges. Table 1b is Figure 4A Aspherical coefficients of various lenses of the telephoto lens 1 in a possible embodiment are shown.

[0238] Table 1a

[0239]

[0240]

[0241] Table 1b

[0242]

[0243] The aspherical surface of the telephoto lens 1 in Table 1a can be defined by, but not limited to, the following aspherical surface curve equation:

[0244]

[0245] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 1b.

[0246] Please refer to Table 1c and Table 1d. Table 1c and Table 1d are Figure 4A The basic parameters of the telephoto lens 1 in a possible embodiment are shown. f1 to f7 in Table 1c are the focal lengths of the first lens L1 to the seventh lens L7, respectively. F1 and F2 in Table 1d are the focal lengths of the first lens group G1 and the second lens group G2, respectively. T1 and T2 are the thicknesses of the first lens group G1 and the second lens group G2, respectively.

[0247] Table 1c

[0248] parameter f1 f2 f3 f4 f5 f6 f7 Aperture value Field of view Numeric 7.83 -10.8 14.59 -5.53 17.9 42.13 33.13 1.6 26°

[0249] Table 1d

[0250]

[0251] In this embodiment, when the telephoto lens 1 switches from a long shot to a close shot, for example, when switching to focus on an object at 50 mm in the close shot, the first lens group G1 moves toward the object side, and the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2 mm. That is, the focusing travel of the first lens group G1 moving toward the object side is 2 mm. Compared with a conventional lens (usually requiring more than 4 mm), the focusing travel is significantly shortened, and the focusing ability is strong.

[0252] In addition, when the telephoto lens 1 focuses on a long shot, the effective focal length EFL of the telephoto lens 1 is 14.6 mm; when the telephoto lens 1 focuses on a close shot, the effective focal length EFL of the telephoto lens 1 is 12.3 mm. During the focusing process of the telephoto lens 1 switching from a long shot to a close shot, the effective focal length EFL of the telephoto lens 1 decreases.

[0253] In this embodiment, when the telephoto lens 1 switches from a long shot to a close shot, the first lens group G1 moves toward the object side, the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2 mm, and the distance (S14) between the second lens group G2 and the filter 3 remains unchanged, so as to adopt a single-group focusing method to simplify the focusing method. The height of the telephoto lens 1 increases.

[0254] In this embodiment, as shown in Table 1d, F1 < 0.9EFL (0.9EFL = 0.9 x 14.6 = 13.14), then the focal length F1 of the first lens group G1 is relatively small, and the light-gathering ability is relatively strong, which is beneficial to achieving a close shot within 10 cm.

[0255] In addition, -EFL < F2, then the focal length F2 of the second lens group is relatively small, and the light-gathering ability is relatively strong, which is convenient for focusing and shortens the motor travel.

[0256] In addition, (F1 - F2) / F1 is approximately equal to 3, then the difference in the focal lengths of the two lens groups is relatively small, which can improve the light-gathering ability of the telephoto lens 1 and is beneficial to achieving a close-shot imaging; and the focal length F2 of the second lens group G2 is relatively large, so that the degree of light deflection of the telephoto lens 1 can be reduced, the aberration can be reduced, and the imaging quality can be improved.

[0257] In addition, the focal length f1 of the first lens L1 is the focal length f11 of the first lens L11 of the first lens group G1. 0.5 < f1 / F1 < 1, that is, 0.5 < f11 / F1 < 1, making the focal length f11 of the first lens L11 of the first lens group G1 differ less from the focal length F1 of the first lens group G1, facilitating the adjustment of the focal length f11 of the first lens L11 to obtain the focal length F1 of the first lens group G1.

[0258] In addition, the focal length f4 of the fourth lens L4 is the focal length f21 of the first lens L21 of the second lens group G2. 0.2 < f4 / F2 < 1, that is, 0.2 < f21 / F2 < 1, making the focal length f21 of the first lens L21 of the second lens group G2 differ less from the focal length F2 of the second lens group G2, facilitating the adjustment of the focal length f21 of the first lens L21 to obtain the focal length F2 of the second lens group G2.

[0259] In addition, 0.3 < T1 / F1 < 1, then the first lens group G1 has a smaller thickness, thus being able to reduce the height of the telephoto lens 1, facilitating storage; facilitating the movement of the first lens group G1 and improving the imaging quality.

[0260] In addition, -1 < T2 / F2 < -0.1, which is beneficial for the second lens group G2 to have a smaller thickness, thereby reducing the height of the telephoto lens 1, facilitating storage; and facilitating the movement of the second lens group G2 and improving the imaging quality.

[0261] In addition, T1 + T2 = 8, 0.6EFL = 0.6 x 14.6 = 8.76, then T1 + T2 < 0.6EFL. The sum of the thickness T1 of the first lens group G1 and the thickness T2 of the second lens group G2 is smaller, making the overall height of the camera module 10 smaller when the telephoto lens 1 is in the storage state, and occupying a smaller space in the whole machine cavity of the electronic device 100, facilitating storage and being better applicable to thin electronic devices.

[0262] Please refer to Figure 4C and Figure 4D , Figure 4C is Figure 4A the simulation effect diagram of the telephoto lens 1 when focusing on a distant view as shown in Figure 4D is Figure 4B the simulation effect diagram of the telephoto lens 1 when focusing on a close view of 50 millimeters as shown in

[0263] Among them, Figure 4C and Figure 4DThey all include the axial chromatic aberration curve diagram, astigmatism field curvature diagram and distortion diagram of the telephoto lens 1. Among them, the axial chromatic aberration curve diagram includes spherical aberration curves corresponding to different bands of the system (including 650nm, 610nm, 555nm, 510nm, 470nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate at the pupil. Figure 4C and Figure 4D The values ​​shown in the middle are all small. When focusing on the distant and near scenes, the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the telephoto lens 1 are well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Figure 4C and Figure 4D The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Figure 4C and Figure 4D The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0264] Please refer to Figure 5A and Figure 5B , Figure 5A is a schematic diagram of the optical path when the camera module 10 focuses on a distant view in the second embodiment provided by the present application, Figure 5B yes Figure 5A The illustrated diagram is a light path diagram of the camera module 10 when focusing on a close-up view of 50 mm. Figure 5A The camera module 10 shown includes Figure 3B Most of the technical features of the camera module 10 are shown. The following mainly describes the differences between the two, and most of the same contents between the two are not repeated.

[0265] In the second embodiment, the telephoto lens 1 includes seven lenses, and the first lens group G1 also includes three lenses. Different from the first embodiment, focusing is performed by moving the second lens group G2 and fixing the first lens group G1.

[0266] Specifically, in the second embodiment, the camera module 10 includes a telephoto lens 1, a filter 3 and a photosensitive element 2. The telephoto lens 1 includes a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The first lens group G1 has positive focal power, and the second lens group G2 has negative focal power. During the focusing process of the telephoto lens 1 switching between a distant view and a near view, the distance H3 between the first lens group G1 and the second lens group G2 changes.

[0267] In this embodiment, the first lens group G1 of the telephoto lens 1 includes a first lens L1, a second lens L2 and a third lens L3 arranged from the object side to the image side, and the second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 arranged from the object side to the image side. Along the direction of the optical axis O, the light passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 in sequence, and then passes through the filter 3, and finally reaches the photosensitive element 2.

[0268] In the second embodiment, the telephoto lens 1 includes seven lenses. The larger the number of lenses, the higher the specification of the telephoto lens 1 and the higher the imaging quality. In addition, the first lens L1 closest to the object side of the three lenses of the first lens group G1 is the main lens, and the second lens L2 and the third lens L3 of the three lenses of the first lens group G1 are used to adjust the parameters such as the focal length of the first lens L1 so that the first lens group G1 obtains the preset optical performance. In this embodiment, the first lens group G1 adjusts the main lens through two lenses, the optical path is simple, the design difficulty of each lens is low, and the thickness TI of the first lens group G1 is small, and the height of the telephoto lens 1 is small, which is convenient for storage.

[0269] like Figure 5A As shown, when the telephoto lens 1 focuses on the distant view, the light reflected by the distant view object passes through the telephoto lens 1 and forms an image on the imaging surface, and the imaging surface falls on the photosensitive element 2, and the camera module 10 can capture the distant view image. Figure 5B As shown, when the telephoto lens 1 focuses on the near-field, the second lens group G2 moves toward the image side along the optical axis O, and the light reflected by the near-field object passes through the telephoto lens 1 and is imaged on the imaging surface, and the imaging surface falls on the photosensitive element 2, so that the camera module 10 can capture near-field images.

[0270] like Figure 5A and Figure 5B As shown, during the focusing process of the telephoto lens 1 switching from the distant view to the near view, the first lens group G1 does not move, the second lens group G2 moves toward the image side along the optical axis O, the distance H3 between the first lens group G1 and the second lens group G2 increases, and the effective focal length EFL of the telephoto lens 1 decreases. In addition, the distance between the first lens group G1 and the photosensitive element 2 remains unchanged, and the distance between the second lens group G2 and the photosensitive element 2 decreases. In the present application, when the telephoto lens 1 focuses on the distant view and the near view, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 remains unchanged, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 decreases.

[0271] The following combines data and simulation results to present Figure 5A The telephoto lens 1 is shown as a concrete solution in a possible embodiment.

[0272] Please refer to Table 2a and Table 2b, where Table 2a is Figure 5A The curvature radius, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 of the telephoto lens 1 in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface located between the filter 3 and the photosensitive element 2, which is used to examine whether the light spot converges. Table 2b is Figure 5A Aspherical coefficients of various lenses of the telephoto lens 1 in a possible embodiment are shown.

[0273] Table 2a

[0274]

[0275]

[0276] Table 2b

[0277]

[0278] The aspherical surface of the telephoto lens 1 in Table 2a can be defined by, but not limited to, the following aspherical surface curve equation:

[0279]

[0280] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 2b.

[0281] Please refer to Table 2c and Table 2d. Table 2c and Table 2d are Figure 5A The basic parameters of the telephoto lens 1 in a possible embodiment are shown. f1 to f7 in Table 2c are the focal lengths of the first lens L1 to the seventh lens L7, respectively. F1 and F2 in Table 2d are the focal lengths of the first lens group G1 and the second lens group G2, respectively. T1 and T2 are the thicknesses of the first lens group G1 and the second lens group G2, respectively.

[0282] Table 2c

[0283] parameter f1 f2 f3 f4 f5 f6 f7 Aperture value Field of view Numeric 7.78 -10.66 10.8 -6.89 28 31 -52 1.8 29°

[0284] Table 2d

[0285]

[0286] In this embodiment, when the telephoto lens 1 switches from a long shot to a close shot, for example, when switching to focus on an object 50 millimeters away in the close shot, the second lens group G2 moves toward the image side, and the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2.3 mm. That is, the focusing travel of the second lens group G2 moving toward the image side is 2.3 mm. Compared with a conventional lens (usually requiring more than 4 mm), the focusing travel is significantly shortened, and the focusing ability is strong.

[0287] In addition, when the telephoto lens 1 focuses on a long shot, the effective focal length EFL of the telephoto lens 1 is 14.75 mm; when the telephoto lens 1 focuses on a close shot, the effective focal length EFL of the telephoto lens 1 is 10.5 mm. During the focusing process of the telephoto lens 1 switching from a long shot to a close shot, the effective focal length EFL of the telephoto lens 1 decreases.

[0288] In this embodiment, when the telephoto lens 1 switches from a long shot to a close shot, the second lens group G2 moves toward the image side, and the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2.3 mm. Correspondingly, the distance (S14) between the second lens group G2 and the filter 3 decreases by 2.3 mm to keep the height of the telephoto lens 1 unchanged.

[0289] In this embodiment, as shown in Table 2d, F1 < 0.9EFL (0.9EFL = 0.9 x 14.75 = 13.275), so the focal length F1 of the first lens group G1 is smaller, and the light converging ability is stronger, which is beneficial to achieving a close shot within 10 centimeters.

[0290] In addition, -EFL < F2, so the focal length F2 of the second lens group is smaller, and the light converging ability is stronger, which is convenient for focusing and shortens the motor travel.

[0291] In addition, (F1 - F2) / F1 < 3, so the difference in focal lengths between the two lens groups is small, which can improve the light converging ability of the telephoto lens 1 and is beneficial to achieving close-up imaging; and the focal length F2 of the second lens group G2 is larger, so that the degree of light deflection of the telephoto lens 1 can be reduced, the aberration can be reduced, and the imaging quality can be improved.

[0292] In addition, the focal length f1 of the first lens L1 is the focal length f11 of the first lens L11 of the first lens group G1. 0.5 < f1 / F1 < 1, that is, 0.5 < f11 / F1 < 1, so that the difference between the focal length f11 of the first lens L11 of the first lens group G1 and the focal length F1 of the first lens group G1 is small, which is convenient for adjusting the focal length f11 of the first lens L11 to obtain the focal length F1 of the first lens group G1.

[0293] In addition, the focal length f4 of the fourth lens L4 is the same as the focal length f21 of the first lens L21 of the second lens group G2. 0.2 < f4 / F2 < 1, that is, 0.2 < f21 / F2 < 1, which makes the focal length f21 of the first lens L21 of the second lens group G2 differ less from the focal length F2 of the second lens group G2, facilitating the adjustment of the focal length f21 of the first lens L21 to obtain the focal length F2 of the second lens group G2.

[0294] In addition, 0.3 < T1 / F1 < 1, so the first lens group G1 has a smaller thickness, which can reduce the height of the telephoto lens 1, facilitating storage; and facilitating the movement of the first lens group G1 to improve the imaging quality.

[0295] In addition, -1 < T2 / F2 < -0.1, which is beneficial for the second lens group G2 to have a smaller thickness, thereby reducing the height of the telephoto lens 1, facilitating storage; and facilitating the movement of the second lens group G2 to improve the imaging quality.

[0296] In addition, T1 + T2 = 7.88, 0.6EFL = 0.6 x 14.75 = 8.85, then T1 + T2 < 0.6EFL. The sum of the thickness T1 of the first lens group G1 and the thickness T2 of the second lens group G2 is smaller, so that when the telephoto lens 1 is in the storage state, the overall height of the camera module 10 is smaller, and it occupies a smaller space in the whole machine cavity of the electronic device 100, facilitating storage and being better applicable to thin electronic devices.

[0297] Please refer to Figure 5C and Figure 5D , Figure 5C is Figure 5A the simulation effect diagram of the telephoto lens 1 when focusing on a distant view as shown, Figure 5D is Figure 5B the simulation effect diagram of the telephoto lens 1 when focusing on a close view of 50 mm as shown.

[0298] Among them, Figure 5C and Figure 5D both include the axial chromatic aberration curve diagram, astigmatism field curvature diagram and distortion diagram of the telephoto lens 1. Among them, the axial chromatic aberration curve diagram includes spherical aberration curves corresponding to different bands of the system (the figure shows 650 nm, 610 nm, 555 nm, 510 nm, 470 nm); its physical meaning is that the light of the corresponding wavelength emitted from the 0-degree field of view, after passing through the optical system, deviates from the ideal image point; its abscissa is the deviation value along the optical axis direction, and the ordinate is the normalized coordinate at the pupil. Figure 5C and Figure 5DThe values ​​shown in the middle are all small. When focusing on the distant and near scenes, the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the telephoto lens 1 are well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Figure 5C and Figure 5D The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Figure 5C and Figure 5D The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0299] Please refer to Fig. 6A and Figure 6B , Fig. 6A is a schematic diagram of the optical path when the camera module 10 focuses on a distant view in the third embodiment provided by the present application, Figure 6B yes Fig. 6A The illustrated diagram is a light path diagram of the camera module 10 when focusing on a close-up view of 50 mm. Fig. 6A The camera module 10 shown includes Figure 3B Most of the technical features of the camera module 10 are shown. The following mainly describes the differences between the two, and most of the same contents between the two are not repeated.

[0300] In the third embodiment, the telephoto lens 1 includes seven lenses, and focusing is performed by moving the first lens group G1 and fixing the second lens group G2. In addition, different from the first embodiment, the first lens group G1 includes four lenses.

[0301] Specifically, in the third embodiment, the camera module 10 includes a telephoto lens 1, a filter 3 and a photosensitive element 2. The telephoto lens 1 includes a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The first lens group G1 has positive focal power, and the second lens group G2 has negative focal power. During the focusing process of the telephoto lens 1 switching between a distant view and a near view, the distance H3 between the first lens group G1 and the second lens group G2 changes.

[0302] In this embodiment, the first lens group G1 of the telephoto lens 1 includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 arranged from the object side to the image side, and the second lens group G2 includes a fifth lens L5, a sixth lens L6 and a seventh lens L7 arranged from the object side to the image side. Along the direction of the optical axis O, the light passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 in sequence, and then passes through the filter 3, and finally reaches the photosensitive element 2.

[0303] like Fig. 6A As shown, when the telephoto lens 1 focuses on the distant view, the light reflected by the distant view object passes through the telephoto lens 1 and forms an image on the imaging surface, and the imaging surface falls on the photosensitive element 2, and the camera module 10 can capture the distant view image. Figure 6B As shown, when the telephoto lens 1 focuses on the near-field, the first lens group G1 moves toward the object side along the optical axis O, and the light reflected by the near-field object passes through the telephoto lens 1 and is imaged on the imaging surface, and the imaging surface falls on the photosensitive element 2, so that the camera module 10 can capture near-field images.

[0304] like Fig. 6A and Figure 6B As shown, during the focusing process of the telephoto lens 1 switching from the distant view to the near view, the first lens group G1 moves toward the object side along the optical axis O, the second lens group G2 does not move, the distance H3 between the first lens group G1 and the second lens group G2 increases, and the effective focal length EFL of the telephoto lens 1 decreases. In addition, the distance between the first lens group G1 and the photosensitive element 2 increases, and the distance between the second lens group G2 and the photosensitive element 2 remains unchanged. In the present application, when the telephoto lens 1 focuses on the distant view and the near view, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 increases, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 remains unchanged.

[0305] The following combines data and simulation results to present Fig. 6A The telephoto lens 1 is shown as a concrete solution in a possible embodiment.

[0306] Please refer to Table 3a and Table 3b, where Table 3a is Fig. 6A The curvature radius, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 of the telephoto lens 1 in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface between the filter 3 and the photosensitive element 2, which is used to examine whether the light spot converges. Table 3b is Fig. 6A Aspherical coefficients of various lenses of the telephoto lens 1 in a possible embodiment are shown.

[0307] Table 3a

[0308]

[0309]

[0310] Table 3b

[0311]

[0312]

[0313] The aspherical surface of the telephoto lens 1 in Table 3a can be defined by, but not limited to, the following aspherical surface curve equation:

[0314]

[0315] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 3b.

[0316] Please refer to Table 3c and Table 3d. Table 3c and Table 3d are Fig. 6A The basic parameters of the telephoto lens 1 in a possible embodiment are shown. f1 to f7 in Table 3c are the focal lengths of the first lens L1 to the seventh lens L7, respectively. F1 and F2 in Table 3d are the focal lengths of the first lens group G1 and the second lens group G2, respectively. T1 and T2 are the thicknesses of the first lens group G1 and the second lens group G2, respectively.

[0317] Table 3c

[0318] parameter f1 f2 f3 f4 f5 f6 f7 Aperture value Field of view Numeric 6.43 -9.5 30.3 61 -7.65 47 27.3 1.8 27°

[0319] Table 3d

[0320]

[0321] In this embodiment, when the telephoto lens 1 switches from a distant view to a near view, for example, switches to focus on a near view of 50 mm, the first lens group G1 moves toward the object side, and the distance (S8) between the first lens group G1 and the second lens group G2 increases by 2 mm, that is, the focusing stroke of the first lens group G1 moving toward the object side is 2 mm. Compared with a conventional lens (usually requiring more than 4 mm), the focusing stroke is significantly shortened, and the focusing capability is strong.

[0322] In addition, when the telephoto lens 1 focuses on the distant view, the effective focal length EFL of the telephoto lens 1 is 14.55 mm; when the telephoto lens 1 focuses on the near view, the effective focal length EFL of the telephoto lens 1 is 12.2 mm. During the process of switching the telephoto lens 1 from the distant view to the near view, the effective focal length EFL of the telephoto lens 1 decreases.

[0323] In this embodiment, when the telephoto lens 1 switches from a distant view to a close view, the first lens group G1 moves toward the object side, the distance (S8) between the first lens group G1 and the second lens group G2 increases by 2 mm, and the distance (S14) between the second lens group G2 and the filter 3 remains unchanged, so as to adopt a single-group focusing method and simplify the focusing method. The height of the telephoto lens 1 increases.

[0324] In this embodiment, as shown in Table 3d, F1 < 0.9EFL (0.9EFL = 0.9 x 14.55 = 13.095). Then the focal length F1 of the first lens group G1 is relatively small, and its light converging ability is relatively strong, which is beneficial for achieving close-up shooting within 10 centimeters.

[0325] In addition, -EFL < F2. Then the focal length F2 of the second lens group is relatively small, and its light converging ability is relatively strong, which is convenient for focusing and shortens the motor stroke.

[0326] In addition, (F1 - F2) / F1 is approximately equal to 3. Then the difference in the focal lengths of the two lens groups is relatively small, which can improve the light converging ability of the telephoto lens 1 and is beneficial for achieving close-up imaging. Moreover, the focal length F2 of the second lens group G2 is relatively large, which can reduce the degree of light deflection of the telephoto lens 1, reduce aberration, and improve imaging quality.

[0327] In addition, the focal length f1 of the first lens L1 is the focal length f11 of the first lens L11 of the first lens group G1. 0.5 < f1 / F1 < 1, that is, 0.5 < f11 / F1 < 1, which makes the difference between the focal length f11 of the first lens L11 of the first lens group G1 and the focal length F1 of the first lens group G1 relatively small, facilitating the adjustment of the focal length f11 of the first lens L11 to obtain the focal length F1 of the first lens group G1.

[0328] In addition, the focal length f5 of the fifth lens L5 is the focal length f21 of the first lens L21 of the second lens group G2. 0.2 < f5 / F2 < 1, that is, 0.2 < f21 / F2 < 1, which makes the difference between the focal length f21 of the first lens L21 of the second lens group G2 and the focal length F2 of the second lens group G2 relatively small, facilitating the adjustment of the focal length f21 of the first lens L21 to obtain the focal length F2 of the second lens group G2.

[0329] In addition, 0.3 < T1 / F1 < 1. Then the thickness of the first lens group G1 is relatively small, which can reduce the height of the telephoto lens 1 and facilitate storage. It is also convenient for the movement of the first lens group G1 and improves imaging quality.

[0330] In addition, -1 < T2 / F2 < -0.1, which is beneficial for making the second lens group G2 have a relatively small thickness, thus reducing the height of the telephoto lens 1 and facilitating storage. It is also convenient for the movement of the second lens group G2 and improves imaging quality.

[0331] In addition, T1+T2=8.72, 0.6EFL=0.6x14.55=8.73, then T1+T2<0.6EFL, the sum of the thickness T1 of the first lens group G1 and the thickness T2 of the second lens group G2 is small, so that when the telephoto lens 1 is in the storage state, the overall height of the camera module 10 is small, and it occupies a smaller space in the entire inner cavity of the electronic device 100, which is convenient for storage and can be better suitable for thin electronic devices.

[0332] Please refer to Figure 6C and Fig.6D , Figure 6C yes Fig. 6A The simulation effect diagram of the telephoto lens 1 when focusing on the distant scene is shown in FIG. Fig.6D yes Figure 6B The simulation effect diagram of the telephoto lens 1 when focusing on a close-up of 50 mm is shown.

[0333] in, Figure 6C and Fig.6D They all include the axial chromatic aberration curve diagram, astigmatism field curvature diagram and distortion diagram of the telephoto lens 1. Among them, the axial chromatic aberration curve diagram includes spherical aberration curves corresponding to different bands of the system (including 650nm, 610nm, 555nm, 510nm, 470nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate at the pupil. Figure 6C and Fig.6D The values ​​shown in the middle are all small. When focusing on the distant and near scenes, the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the telephoto lens 1 are well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Figure 6C and Fig.6D The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Figure 6C and Fig.6D The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0334] Please refer to Fig. 7A and Figure 7B , Fig. 7A is a schematic diagram of the optical path when the camera module 10 focuses on a distant view in the fourth embodiment provided by the present application, Figure 7B yes Fig. 7A The illustrated diagram is a light path diagram of the camera module 10 when focusing on a close-up view of 50 mm. Fig. 7AThe camera module 10 shown includes Figure 3B Most of the technical features of the camera module 10 are shown. The following mainly describes the differences between the two, and most of the same contents between the two are not repeated.

[0335] In the fourth embodiment, the telephoto lens 1 includes seven lenses. In addition, different from the first embodiment, the first lens group G1 includes four lenses, and focusing is performed by moving the second lens group G2 and fixing the first lens group G1.

[0336] Specifically, in the fourth embodiment, the camera module 10 includes a telephoto lens 1, a filter 3 and a photosensitive element 2. The telephoto lens 1 includes a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The first lens group G1 has positive focal power, and the second lens group G2 has negative focal power. During the focusing process of the telephoto lens 1 switching between a distant view and a near view, the distance H3 between the first lens group G1 and the second lens group G2 changes.

[0337] In this embodiment, the first lens group G1 of the telephoto lens 1 includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 arranged from the object side to the image side, and the second lens group G2 includes a fifth lens L5, a sixth lens L6 and a seventh lens L7 arranged from the object side to the image side. Along the direction of the optical axis O, the light passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 in sequence, and then passes through the filter 3, and finally reaches the photosensitive element 2.

[0338] like Fig. 7A As shown, when the telephoto lens 1 focuses on the distant view, the light reflected by the distant view object passes through the telephoto lens 1 and forms an image on the imaging surface, and the imaging surface falls on the photosensitive element 2, and the camera module 10 can capture the distant view image. Figure 7B As shown, when the telephoto lens 1 focuses on the near-field, the second lens group G2 moves toward the image side along the optical axis O, and the light reflected by the near-field object passes through the telephoto lens 1 and is imaged on the imaging surface, and the imaging surface falls on the photosensitive element 2, so that the camera module 10 can capture near-field images.

[0339] like Fig. 7A and Figure 7BAs shown, during the focusing process of the telephoto lens 1 switching from the distant view to the near view, the first lens group G1 does not move, the second lens group G2 moves toward the image side along the optical axis O, the distance H3 between the first lens group G1 and the second lens group G2 increases, and the effective focal length EFL of the telephoto lens 1 decreases. In addition, the distance between the first lens group G1 and the photosensitive element 2 remains unchanged, and the distance between the second lens group G2 and the photosensitive element 2 decreases. In the present application, when the telephoto lens 1 focuses on the distant view and the near view, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 remains unchanged, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 decreases.

[0340] The following combines data and simulation results to present Fig. 7A The telephoto lens 1 is shown as a concrete solution in a possible embodiment.

[0341] Please refer to Table 4a and Table 4b. Table 4a is Fig. 7A The curvature radius, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 of the telephoto lens 1 in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface between the filter 3 and the photosensitive element 2, which is used to examine whether the light spot converges. Table 4b is Fig. 7A Aspherical coefficients of various lenses of the telephoto lens 1 in a possible embodiment are shown.

[0342] Table 4a

[0343]

[0344] Table 4b

[0345]

[0346]

[0347] The aspherical surface of the telephoto lens 1 in Table 4a can be defined by, but not limited to, the following aspherical surface curve equation:

[0348]

[0349] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 4b.

[0350] Please refer to Table 4c and Table 4d. Table 4c and Table 4d are Fig. 7AThe basic parameters of the telephoto lens 1 shown in a possible embodiment. f1 to f7 in Table 4c are the focal lengths of the first lens L1 to the seventh lens L7 respectively, F1 and F2 in Table 4d are the focal lengths of the first lens group G1 and the second lens group G2 respectively, and T1 and T2 are the thicknesses of the first lens group G1 and the second lens group G2 respectively.

[0351] Table 4c

[0352] parameter f1 f2 f3 f4 f5 f6 f7 Aperture value Field of view Numeric 6.46 -9.6 28.5 67.7 -7.49 58.3 23.3 1.8 26°

[0353] Table 4d

[0354]

[0355]

[0356] In this embodiment, when the telephoto lens 1 switches from a long shot to a close shot, for example, when switching to focus on an object at 50 mm in the close shot, the second lens group G2 moves towards the image side, and the distance (S8) between the first lens group G1 and the second lens group G2 increases by 2.2 mm. That is, the focusing stroke of the second lens group G2 moving towards the image side is 2.2 mm. Compared with a conventional lens (usually requiring more than 4 mm), the focusing stroke is significantly shortened and the focusing ability is strong.

[0357] In addition, when the telephoto lens 1 focuses on a long shot, the effective focal length EFL of the telephoto lens 1 is 14.55 mm; when the telephoto lens 1 focuses on a close shot, the effective focal length EFL of the telephoto lens 1 is 10.5 mm. During the focusing process of the telephoto lens 1 switching from a long shot to a close shot, the effective focal length EFL of the telephoto lens 1 decreases.

[0358] In this embodiment, when the telephoto lens 1 switches from a long shot to a close shot, the second lens group G2 moves towards the image side, and the distance (S8) between the first lens group G1 and the second lens group G2 increases by 2.2 mm. Correspondingly, the distance (S14) between the second lens group G2 and the filter 3 decreases by 2.2 mm to keep the height of the telephoto lens 1 unchanged.

[0359] In this embodiment, as shown in Table 4d, F1 < 0.9EFL (0.9EFL = 0.9 x 14.55 = 13.095), then the focal length F1 of the first lens group G1 is smaller, and the light converging ability is stronger, which is beneficial for achieving close shot photography within 10 cm.

[0360] In addition, -EFL < F2, then the focal length F2 of the second lens group is smaller, and the light converging ability is stronger, which is convenient for focusing and shortens the motor stroke.

[0361] In addition, if (F1 - F2) / F1 is approximately equal to 3, the focal lengths of the two lens groups differ slightly, which can enhance the light-gathering ability of the telephoto lens 1 and is conducive to achieving close-up imaging. Moreover, the focal length F2 of the second lens group G2 is relatively large, which can reduce the degree of light deflection by the telephoto lens 1, reduce aberration, and improve the imaging quality.

[0362] In addition, the focal length f1 of the first lens L1 is the focal length f11 of the first lens L11 of the first lens group G1. 0.5 < f1 / F1 < 1, that is, 0.5 < f11 / F1 < 1, which makes the focal length f11 of the first lens L11 of the first lens group G1 differ slightly from the focal length F1 of the first lens group G1, facilitating the adjustment of the focal length f11 of the first lens L11 to obtain the focal length F1 of the first lens group G1.

[0363] In addition, the focal length f5 of the fifth lens L5 is the focal length f21 of the first lens L21 of the second lens group G2. 0.2 < f5 / F2 < 1, that is, 0.2 < f21 / F2 < 1, which makes the focal length f21 of the first lens L21 of the second lens group G2 differ slightly from the focal length F2 of the second lens group G2, facilitating the adjustment of the focal length f21 of the first lens L21 to obtain the focal length F2 of the second lens group G2.

[0364] In addition, if 0.3 < T1 / F1 < 1, the thickness of the first lens group G1 is small, which can reduce the height of the telephoto lens 1, facilitating storage; it also facilitates the movement of the first lens group G1 and improves the imaging quality.

[0365] In addition, if -1 < T2 / F2 < -0.1, it is beneficial for the second lens group G2 to have a small thickness, thereby reducing the height of the telephoto lens 1, facilitating storage; and it also facilitates the movement of the second lens group G2 and improves the imaging quality.

[0366] In addition, T1 + T2 = 8.95, 0.6EFL = 0.8 x 14.55 = 11.64, then T1 + T2 < 0.8EFL. The sum of the thickness T1 of the first lens group G1 and the thickness T2 of the second lens group G2 is small, so that when the telephoto lens 1 is in the storage state, the overall height of the camera module 10 is small, and it occupies a small space in the internal cavity of the electronic device 100, facilitating storage and being more suitable for thin electronic devices.

[0367] Please refer to Figure 7C and Fig.7D , Figure 7C which is Fig. 7A the simulation effect diagram of the telephoto lens 1 when focused on a distant view as shown, Fig.7D and Figure 7B is the simulation effect diagram of the telephoto lens 1 when focused on a 50-mm close view as shown.

[0368] in, Figure 7C and Fig.7D They all include the axial chromatic aberration curve diagram, astigmatism field curvature diagram and distortion diagram of the telephoto lens 1. Among them, the axial chromatic aberration curve diagram includes spherical aberration curves corresponding to different bands of the system (including 650nm, 610nm, 555nm, 510nm, 470nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate at the pupil. Figure 7C and Fig.7D The values ​​shown in the middle are all small. When focusing on the distant and near scenes, the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the telephoto lens 1 are well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Figure 7C and Fig.7D The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Figure 7C and Fig.7D The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0369] Please refer to Fig. 8A and Figure 8B , Fig. 8A is a schematic diagram of the optical path when the camera module 10 focuses on a distant view in the fifth embodiment provided by the present application, Figure 8B yes Fig. 8A The illustrated diagram is a light path diagram of the camera module 10 when focusing on a close-up view of 50 mm. Fig. 8A The camera module 10 shown includes Figure 3B Most of the technical features of the camera module 10 are shown. The following mainly describes the differences between the two, and most of the same contents between the two are not repeated.

[0370] In the fifth embodiment, different from the first embodiment, the telephoto lens 1 includes six lenses. In addition, the first lens group G1 includes three lenses. Focusing is performed by moving the first lens group G1 and fixing the second lens group G2.

[0371] Specifically, in the fifth embodiment, the camera module 10 includes a telephoto lens 1, a filter 3 and a photosensitive element 2. The telephoto lens 1 includes a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The first lens group G1 has positive focal power, and the second lens group G2 has negative focal power. During the focusing process of the telephoto lens 1 switching between a distant view and a near view, the distance H3 between the first lens group G1 and the second lens group G2 changes.

[0372] In this embodiment, the first lens group G1 of the telephoto lens 1 includes a first lens L1, a second lens L2 and a third lens L3 arranged from the object side to the image side, and the second lens group G2 includes a fourth lens L4, a fifth lens L5 and a sixth lens L6 arranged from the object side to the image side. Along the direction of the optical axis O, the light passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 in sequence, and then passes through the filter 3, and finally reaches the photosensitive element 2.

[0373] like Fig. 8A As shown, when the telephoto lens 1 focuses on the distant view, the light reflected by the distant view object passes through the telephoto lens 1 and forms an image on the imaging surface, and the imaging surface falls on the photosensitive element 2, and the camera module 10 can capture the distant view image. Figure 8B As shown, when the telephoto lens 1 focuses on the near-field, the first lens group G1 moves toward the object side along the optical axis O, and the light reflected by the near-field object passes through the telephoto lens 1 and is imaged on the imaging surface, and the imaging surface falls on the photosensitive element 2, so that the camera module 10 can capture near-field images.

[0374] like Fig. 8A and Figure 8B As shown, during the focusing process of the telephoto lens 1 switching from the distant view to the near view, the first lens group G1 moves toward the object side along the optical axis O, the second lens group G2 does not move, the distance H3 between the first lens group G1 and the second lens group G2 increases, and the effective focal length EFL of the telephoto lens 1 decreases. In addition, the distance between the first lens group G1 and the photosensitive element 2 increases, and the distance between the second lens group G2 and the photosensitive element 2 remains unchanged. In the present application, when the telephoto lens 1 focuses on the distant view and the near view, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 increases, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 remains unchanged.

[0375] The following combines data and simulation results to present Fig. 8A The telephoto lens 1 is shown as a concrete solution in a possible embodiment.

[0376] Please refer to Table 5a and Table 5b, where Table 5a is Fig. 8AThe curvature radius, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 of the telephoto lens 1 in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface between the filter 3 and the photosensitive element 2, which is used to examine whether the light spot converges. Table 5b is Fig. 8A Aspherical coefficients of various lenses of the telephoto lens 1 in a possible embodiment are shown.

[0377] Table 5a

[0378]

[0379] Table 5b

[0380]

[0381] The aspherical surface of the telephoto lens 1 in Table 5a can be defined by, but not limited to, the following aspherical surface curve equation:

[0382]

[0383] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 5b.

[0384] Please refer to Table 5c and Table 5d. Table 5c and Table 5d are Fig. 8A The basic parameters of the telephoto lens 1 in a possible embodiment are shown. f1 to f6 in Table 5c are the focal lengths of the first lens L1 to the sixth lens L6, respectively. F1 and F2 in Table 5d are the focal lengths of the first lens group G1 and the second lens group G2, respectively. T1 and T2 are the thicknesses of the first lens group G1 and the second lens group G2, respectively.

[0385] Table 5c

[0386]

[0387]

[0388] Table 5d

[0389]

[0390] In this embodiment, when the telephoto lens 1 switches from a long-distance view to a close-up view, for example, when switching to focus on an object at 50 mm in the close-up view, the first lens group G1 moves toward the object side, and the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2 mm. That is, the focusing travel of the first lens group G1 moving toward the object side is 2 mm. Compared with a conventional lens (usually requiring more than 4 mm), the focusing travel is significantly shortened, and the focusing ability is strong.

[0391] In addition, when the telephoto lens 1 focuses on a long-distance view, the effective focal length EFL of the telephoto lens 1 is 14.6 mm; when the telephoto lens 1 focuses on a close-up view, the effective focal length EFL of the telephoto lens 1 is 12.4 mm. During the focusing process of the telephoto lens 1 switching from a long-distance view to a close-up view, the effective focal length EFL of the telephoto lens 1 decreases.

[0392] In this embodiment, when the telephoto lens 1 switches from a long-distance view to a close-up view, the first lens group G1 moves toward the object side, and the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2 mm, while the distance (S12) between the second lens group G2 and the filter 3 remains unchanged, so as to adopt a single-group focusing method and simplify the focusing method. The height of the telephoto lens 1 increases.

[0393] In this embodiment, as shown in Table 5d, F1 < 0.9EFL (0.9EFL = 0.9 x 14.6 = 13.14), so the focal length F1 of the first lens group G1 is relatively small, and the light-gathering ability is relatively strong, which is beneficial to achieving close-up shooting within 10 cm.

[0394] In addition, -EFL < F2, so the focal length F2 of the second lens group is relatively small, and the light-gathering ability is relatively strong, which is convenient for focusing and shortens the motor travel.

[0395] In addition, (F1 - F2) / F1 is approximately equal to 3, so the difference in the focal lengths of the two lens groups is relatively small, which can improve the light-gathering ability of the telephoto lens 1 and is beneficial to achieving close-up imaging; and the focal length F2 of the second lens group G2 is relatively large, so that the degree of light deflection of the telephoto lens 1 can be reduced, the aberration can be reduced, and the imaging quality can be improved.

[0396] In addition, the focal length f1 of the first lens L1 is the focal length f11 of the first lens L11 of the first lens group G1. 0.5 < f1 / F1 < 1, that is, 0.5 < f11 / F1 < 1, so that the difference between the focal length f11 of the first lens L11 of the first lens group G1 and the focal length F1 of the first lens group G1 is relatively small, which is convenient for adjusting the focal length f11 of the first lens L11 to obtain the focal length F1 of the first lens group G1.

[0397] In addition, the focal length f4 of the fourth lens L4 is the same as the focal length f21 of the first lens L21 of the second lens group G2. 0.2 < f4 / F2 < 1, that is, 0.2 < f21 / F2 < 1, which makes the focal length f21 of the first lens L21 of the second lens group G2 differ less from the focal length F2 of the second lens group G2, facilitating the adjustment of the focal length f21 of the first lens L21 to obtain the focal length F2 of the second lens group G2.

[0398] In addition, 0.3 < T1 / F1 < 1, then the thickness of the first lens group G1 is small, which can reduce the height of the telephoto lens 1, facilitating storage; and facilitating the movement of the first lens group G1 to improve the imaging quality.

[0399] In addition, -1 < T2 / F2 < -0.1, which is beneficial to making the second lens group G2 have a small thickness, thereby reducing the height of the telephoto lens 1, facilitating storage; and facilitating the movement of the second lens group G2 to improve the imaging quality.

[0400] In addition, T1 + T2 = 7.98, 0.6EFL = 0.6 x 14.6 = 8.76, then T1 + T2 < 0.6EFL. The sum of the thickness T1 of the first lens group G1 and the thickness T2 of the second lens group G2 is small, making the overall height of the camera module 10 small when the telephoto lens 1 is in the storage state, and occupying a small space in the whole machine cavity of the electronic device 100, facilitating storage and being better applicable to thin electronic devices.

[0401] Please refer to Figure 8C and Fig.8D , Figure 8C is Fig. 8A the simulation effect diagram of the telephoto lens 1 when focusing on a distant view as shown, Fig.8D is Figure 8B the simulation effect diagram of the telephoto lens 1 when focusing on a close view of 50 mm as shown.

[0402] Among them, Figure 8C and Fig.8D both include the axial chromatic aberration curve diagram, astigmatism field curvature diagram and distortion diagram of the telephoto lens 1. Among them, the axial chromatic aberration curve diagram includes spherical aberration curves corresponding to different bands of the system (the diagram shows 650 nm, 610 nm, 555 nm, 510 nm, 470 nm); its physical meaning is that the light of the corresponding wavelength emitted from the 0-degree field of view, after passing through the optical system, deviates from the ideal image point; its abscissa is the deviation value along the optical axis direction, and the ordinate is the normalized coordinate at the pupil. Figure 8C and Fig.8DThe values ​​shown in the middle are all small. When focusing on the distant and near scenes, the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the telephoto lens 1 are well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Figure 8C and Fig.8D The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Figure 8C and Fig.8D The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0403] Please refer to Fig. 9A and Fig. 9B , Fig. 9A is a schematic diagram of the optical path when the camera module 10 focuses on a distant view in the sixth embodiment provided by the present application, Fig. 9B yes Fig. 9A The illustrated diagram is a light path diagram of the camera module 10 when focusing on a close-up view of 50 mm. Fig. 9A The camera module 10 shown includes Figure 3B Most of the technical features of the camera module 10 are shown. The following mainly describes the differences between the two, and most of the same contents between the two are not repeated.

[0404] In the sixth embodiment, different from the first embodiment, the telephoto lens 1 includes six lenses. In addition, the first lens group G1 includes three lenses. Focusing is performed by moving the second lens group G2 and fixing the first lens group G1.

[0405] Specifically, in the sixth embodiment, the camera module 10 includes a telephoto lens 1, a filter 3 and a photosensitive element 2. The telephoto lens 1 includes a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The first lens group G1 has positive focal power, and the second lens group G2 has negative focal power. During the focusing process of the telephoto lens 1 switching between a distant view and a near view, the distance H3 between the first lens group G1 and the second lens group G2 changes.

[0406] In this embodiment, the first lens group G1 of the telephoto lens 1 includes a first lens L1, a second lens L2 and a third lens L3 arranged from the object side to the image side, and the second lens group G2 includes a fourth lens L4, a fifth lens L5 and a sixth lens L6 arranged from the object side to the image side. Along the direction of the optical axis O, the light passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 in sequence, and then passes through the filter 3, and finally reaches the photosensitive element 2.

[0407] In the sixth embodiment, the telephoto lens 1 includes six lenses. In addition, the first lens L1 closest to the object side of the three lenses of the first lens group G1 is the main lens, and the second lens L2 and the third lens L3 of the three lenses of the first lens group G1 are used to adjust the parameters such as the focal length of the first lens L1, so that the first lens group G1 obtains the preset optical performance. In this embodiment, the first lens group G1 adjusts the main lens through two lenses, the optical path is simple, the design difficulty of each lens is low, and the thickness TI of the first lens group G1 is small, and the height of the telephoto lens 1 is small, which is easy to store.

[0408] like Fig. 9A As shown, when the telephoto lens 1 focuses on the distant view, the light reflected by the distant view object passes through the telephoto lens 1 and forms an image on the imaging surface, and the imaging surface falls on the photosensitive element 2, and the camera module 10 can capture the distant view image. Fig. 9B As shown, when the telephoto lens 1 focuses on the near-field, the second lens group G2 moves toward the image side along the optical axis O, and the light reflected by the near-field object passes through the telephoto lens 1 and is imaged on the imaging surface, and the imaging surface falls on the photosensitive element 2, so that the camera module 10 can capture near-field images.

[0409] like Fig. 9A and Fig. 9B As shown, during the focusing process of the telephoto lens 1 switching from the distant view to the near view, the first lens group G1 does not move, the second lens group G2 moves toward the image side along the optical axis O, the distance H3 between the first lens group G1 and the second lens group G2 increases, and the effective focal length EFL of the telephoto lens 1 decreases. In addition, the distance between the first lens group G1 and the photosensitive element 2 remains unchanged, and the distance between the second lens group G2 and the photosensitive element 2 decreases. In the present application, when the telephoto lens 1 focuses on the distant view and the near view, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 remains unchanged, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 decreases.

[0410] The following combines data and simulation results to present Fig. 9A The telephoto lens 1 is shown as a concrete solution in a possible embodiment.

[0411] Please refer to Table 6a and Table 6b, where Table 6a is Fig. 9A The curvature radius, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 of the telephoto lens 1 in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface located between the filter 3 and the photosensitive element 2, which is used to examine whether the light spot converges. Table 6b is Fig. 9A Aspherical coefficients of various lenses of the telephoto lens 1 in a possible embodiment are shown.

[0412] Table 6a

[0413]

[0414]

[0415] Table 6b

[0416]

[0417] The aspherical surface of the telephoto lens 1 in Table 6a can be defined by, but not limited to, the following aspherical surface curve equation:

[0418]

[0419] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 6b.

[0420] Please refer to Table 6c and Table 6d. Table 6c and Table 6d are Fig. 9A The basic parameters of the telephoto lens 1 in a possible embodiment are shown. f1 to f6 in Table 6c are the focal lengths of the first lens L1 to the sixth lens L6, respectively. F1 and F2 in Table 6d are the focal lengths of the first lens group G1 and the second lens group G2, respectively. T1 and T2 are the thicknesses of the first lens group G1 and the second lens group G2, respectively.

[0421] Table 6c

[0422]

[0423]

[0424] Table 6d

[0425]

[0426] In this embodiment, when the telephoto lens 1 switches from a distant view to a near view, for example, switches to focus on a near view of 50 mm, the second lens group G2 moves toward the image side, and the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2.3 mm, that is, the focusing stroke of the second lens group G2 moving toward the image side is 2.3 mm. Compared with a conventional lens (usually requiring more than 4 mm), the focusing stroke is significantly shortened, and the focusing capability is strong.

[0427] In addition, when the telephoto lens 1 focuses on a distant view, the effective focal length EFL of the telephoto lens 1 is 14.55 mm; when the telephoto lens 1 focuses on a close view, the effective focal length EFL of the telephoto lens 1 is 10.6 mm. During the focusing process of the telephoto lens 1 switching from a distant view to a close view, the effective focal length EFL of the telephoto lens 1 decreases.

[0428] In this embodiment, when the telephoto lens 1 switches from a distant view to a close view, the second lens group G2 moves toward the image side, and the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2.3 mm. Correspondingly, the distance (S12) between the second lens group G2 and the filter 3 decreases by 2.3 mm to keep the height of the telephoto lens 1 unchanged.

[0429] In this embodiment, as shown in Table 6d, F1 < 0.9EFL (0.9EFL = 0.9 x 14.55 = 13.095), so the focal length F1 of the first lens group G1 is relatively small, and the light converging ability is relatively strong, which is beneficial to achieving close view shooting within 10 cm.

[0430] In addition, -EFL < F2, so the focal length F2 of the second lens group is relatively small, and the light converging ability is relatively strong, which is convenient for focusing and shortens the motor stroke.

[0431] In addition, (F1 - F2) / F1 is approximately equal to 3, so the difference in the focal lengths of the two lens groups is relatively small, which can improve the light converging ability of the telephoto lens 1 and is beneficial to achieving close view imaging; and the focal length F2 of the second lens group G2 is relatively large, so that the degree of light deflection of the telephoto lens 1 can be reduced, chromatic aberration can be reduced, and the imaging quality can be improved.

[0432] In addition, the focal length f1 of the first lens L1 is the focal length f11 of the first lens L11 of the first lens group G1. 0.5 < f1 / F1 < 1, that is, 0.5 < f11 / F1 < 1, so that the difference between the focal length f11 of the first lens L11 of the first lens group G1 and the focal length F1 of the first lens group G1 is relatively small, which is convenient for adjusting the focal length f11 of the first lens L11 to obtain the focal length F1 of the first lens group G1.

[0433] In addition, the focal length f4 of the fourth lens L4 is the focal length f21 of the first lens L21 of the second lens group G2. 0.2 < f4 / F2 < 1, that is, 0.2 < f21 / F2 < 1, so that the difference between the focal length f21 of the first lens L21 of the second lens group G2 and the focal length F2 of the second lens group G2 is relatively small, which is convenient for adjusting the focal length f21 of the first lens L21 to obtain the focal length F2 of the second lens group G2.

[0434] In addition, 0.3 < T1 / F1 < 1, so the thickness of the first lens group G1 is small, which can reduce the height of the telephoto lens 1, facilitating storage; it is also convenient for the movement of the first lens group G1, improving the imaging quality.

[0435] In addition, -1 < T2 / F2 < -0.1, which is conducive to making the second lens group G2 have a small thickness, thus reducing the height of the telephoto lens 1, facilitating storage; and it is convenient for the movement of the second lens group G2, improving the imaging quality.

[0436] In addition, T1 + T2 = 8.09, 0.6EFL = 0.6 x 14.55 = 8.73, then T1 + T2 < 0.6EFL. The sum of the thickness T1 of the first lens group G1 and the thickness T2 of the second lens group G2 is small, so that when the telephoto lens 1 is in the storage state, the overall height of the camera module 10 is small, and it occupies a small space in the whole machine cavity of the electronic device 100, facilitating storage and being better applicable to thin electronic devices.

[0437] Please refer to Fig. 9C and Fig.9D , Fig. 9C which Fig. 9A is the simulation effect diagram of the telephoto lens 1 when focusing on a distant view as shown in Fig.9D and Fig. 9B is the simulation effect diagram of the telephoto lens 1 when focusing on a close view of 50 mm as shown in

[0438] Among them, Fig. 9C and Fig.9D both include the axial chromatic aberration curve diagram, astigmatism field curvature diagram and distortion diagram of the telephoto lens 1. Among them, the axial chromatic aberration curve diagram includes spherical aberration curves corresponding to different bands of the system (the illustration includes 650 nm, 610 nm, 555 nm, 510 nm, 470 nm); its physical meaning is that the light of the corresponding wavelength emitted from the 0-degree field of view, after passing through the optical system, deviates from the ideal image point; its abscissa is the deviation value along the optical axis direction, and the ordinate is the normalized coordinate at the pupil. Fig. 9C and Fig.9D show relatively small values. When focusing on a distant view and a close view, the axial aberrations (such as spherical aberration and chromatic aberration) of the telephoto lens 1 are corrected well. The astigmatism field curvature diagram is used to indicate the deviation of the convergence points of thin beams in different fields of view from the ideal imaging plane. X is the beam in the sagittal direction, Y is the beam in the meridional direction, its abscissa is the deviation value along the optical axis direction, and the ordinate is the corresponding field of view. When a certain field of view value is too large, the image quality of that field of view is poor or there are high-order aberrations. Fig. 9C and Fig.9D show that the field curvatures in both directions are relatively small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation amount between the convergence points of light beams in different fields of view (actual image height) and the ideal image height. Fig. 9C and Fig.9DThe distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0439] Please refer to Fig. 10A and Fig. 10B , Fig. 10A is a schematic diagram of the optical path when the camera module 10 focuses on a distant view in the seventh embodiment provided by the present application, Fig. 10B yes Fig. 10A The illustrated diagram is a light path diagram of the camera module 10 when focusing on a close-up view of 50 mm. Fig. 10A The camera module 10 shown includes Figure 3B Most of the technical features of the camera module 10 are shown. The following mainly describes the differences between the two, and most of the same contents between the two are not repeated.

[0440] In the seventh embodiment, the telephoto lens 1 includes five lenses. In addition, the first lens group G1 includes three lenses. Focusing is performed by moving the first lens group G1 and fixing the second lens group G2.

[0441] Specifically, in the seventh embodiment, the camera module 10 includes a telephoto lens 1, a filter 3 and a photosensitive element 2. The telephoto lens 1 includes a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The first lens group G1 has positive focal power, and the second lens group G2 has negative focal power. During the focusing process of the telephoto lens 1 switching between a distant view and a near view, the distance H3 between the first lens group G1 and the second lens group G2 changes.

[0442] In this embodiment, the first lens group G1 of the telephoto lens 1 includes a first lens L1, a second lens L2 and a third lens L3 arranged from the object side to the image side, and the second lens group G2 includes a fourth lens L4 and a fifth lens L5 arranged from the object side to the image side. Along the direction of the optical axis O, the light passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 in sequence, and then passes through the filter 3, and finally reaches the photosensitive element 2.

[0443] like Fig. 10A As shown, when the telephoto lens 1 focuses on the distant view, the light reflected by the distant view object passes through the telephoto lens 1 and forms an image on the imaging surface, and the imaging surface falls on the photosensitive element 2, and the camera module 10 can capture the distant view image. Fig. 10B As shown, when the telephoto lens 1 focuses on the near-field, the first lens group G1 moves toward the object side along the optical axis O, and the light reflected by the near-field object passes through the telephoto lens 1 and is imaged on the imaging surface, and the imaging surface falls on the photosensitive element 2, so that the camera module 10 can capture near-field images.

[0444] like Fig. 10A and Fig. 10BAs shown, during the focusing process of the telephoto lens 1 switching from the distant view to the near view, the first lens group G1 moves toward the object side along the optical axis O, the second lens group G2 does not move, the distance H3 between the first lens group G1 and the second lens group G2 increases, and the effective focal length EFL of the telephoto lens 1 decreases. In addition, the distance between the first lens group G1 and the photosensitive element 2 increases, and the distance between the second lens group G2 and the photosensitive element 2 remains unchanged. In the present application, when the telephoto lens 1 focuses on the distant view and the near view, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 increases, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 remains unchanged.

[0445] The following combines data and simulation results to present Fig. 10A The telephoto lens 1 is shown as a concrete solution in a possible embodiment.

[0446] Please refer to Table 7a and Table 7b, where Table 7a is Fig. 10A The curvature radius, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 of the telephoto lens 1 in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface between the filter 3 and the photosensitive element 2, which is used to examine whether the light spot converges. Table 7b is Fig. 10A Aspherical coefficients of various lenses of the telephoto lens 1 in a possible embodiment are shown.

[0447] Table 7a

[0448]

[0449]

[0450] Table 7b

[0451]

[0452] The aspherical surface of the telephoto lens 1 in Table 7a can be defined by, but not limited to, the following aspherical surface curve equation:

[0453]

[0454] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 7b.

[0455] Please refer to Table 7c and Table 7d. Table 7c and Table 7d are Fig. 10AThe basic parameters of the long - focal - length lens 1 shown in a possible embodiment. In Table 7c, f1 to f5 are the focal lengths of the first lens L1 to the fifth lens L5 respectively. In Table 7d, F1 and F2 are the focal lengths of the first lens group G1 and the second lens group G2 respectively, and T1 and T2 are the thicknesses of the first lens group G1 and the second lens group G2 respectively.

[0456] Table 7c

[0457] parameter f1 f2 f3 f4 f5 Aperture value Field of view Numeric 7.2 -10.4 17.9 -9.6 26.2 1.9 26°

[0458] Table 7d

[0459]

[0460]

[0461] In this embodiment, when the long - focal - length lens 1 switches from a long - distance view to a short - distance view, for example, when switching to focus on an object at 50 mm in the short - distance view, the first lens group G1 moves towards the object side, and the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2 mm. That is, the focusing stroke of the first lens group G1 moving towards the object side is 2 mm. Compared with a conventional lens (usually requiring more than 4 mm), the focusing stroke is significantly shortened, and the focusing ability is strong.

[0462] In addition, when the long - focal - length lens 1 focuses on a long - distance view, the effective focal length EFL of the long - focal - length lens 1 is 14.6 mm; when the long - focal - length lens 1 focuses on a short - distance view, the effective focal length EFL of the long - focal - length lens 1 is 12.1 mm. During the focusing process of the long - focal - length lens 1 switching from a long - distance view to a short - distance view, the effective focal length EFL of the long - focal - length lens 1 decreases.

[0463] In this embodiment, when the long - focal - length lens 1 switches from a long - distance view to a short - distance view, the first lens group G1 moves towards the object side, the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2 mm, and the distance (S10) between the second lens group G2 and the filter 3 remains unchanged, so as to adopt a single - group focusing method to simplify the focusing method. The height of the long - focal - length lens 1 increases.

[0464] In this embodiment, as shown in Table 7d, F1 < 0.9EFL (0.9EFL = 0.9×14.6 = 13.14), so the focal length F1 of the first lens group G1 is relatively small, and the light - converging ability is relatively strong, which is beneficial to achieving short - distance shooting within 10 cm.

[0465] In addition, - EFL < F2, so the focal length F2 of the second lens group is relatively small, and the light - converging ability is relatively strong, which is convenient for focusing and shortens the motor stroke.

[0466] In addition, if (F1 - F2) / F1 is approximately equal to 3, the focal lengths of the two lens groups differ slightly, which can enhance the light-gathering ability of the telephoto lens 1 and is conducive to achieving close-up imaging. Moreover, the focal length F2 of the second lens group G2 is relatively large, which can reduce the degree of light deflection by the telephoto lens 1, reduce aberration, and improve the imaging quality.

[0467] In addition, the focal length f1 of the first lens L1 is the focal length f11 of the first lens L11 of the first lens group G1. 0.5 < f1 / F1 < 1, that is, 0.5 < f11 / F1 < 1, which makes the focal length f11 of the first lens L11 of the first lens group G1 differ slightly from the focal length F1 of the first lens group G1, facilitating the adjustment of the focal length f11 of the first lens L11 to obtain the focal length F1 of the first lens group G1.

[0468] In addition, the focal length f4 of the fourth lens L4 is the focal length f21 of the first lens L21 of the second lens group G2. 0.2 < f4 / F2 < 1, that is, 0.2 < f21 / F2 < 1, which makes the focal length f21 of the first lens L21 of the second lens group G2 differ slightly from the focal length F2 of the second lens group G2, facilitating the adjustment of the focal length f21 of the first lens L21 to obtain the focal length F2 of the second lens group G2.

[0469] In addition, if 0.3 < T1 / F1 < 1, the thickness of the first lens group G1 is small, which can reduce the height of the telephoto lens 1, facilitating storage; it also facilitates the movement of the first lens group G1 and improves the imaging quality.

[0470] In addition, if -1 < T2 / F2 < -0.1, it is beneficial for the second lens group G2 to have a small thickness, thereby reducing the height of the telephoto lens 1, facilitating storage; and it also facilitates the movement of the second lens group G2 and improves the imaging quality.

[0471] In addition, T1 + T2 = 7.68, 0.6EFL = 0.6 x 14.6 = 8.76, then T1 + T2 < 0.6EFL. The sum of the thickness T1 of the first lens group G1 and the thickness T2 of the second lens group G2 is small, making the overall height of the camera module 10 small when the telephoto lens 1 is in the storage state, and it occupies a small space in the internal cavity of the electronic device 100, facilitating storage and being more suitable for thin electronic devices.

[0472] Please refer to Fig. 10C and Fig. 10D , Fig. 10C which is Fig. 10A the simulation effect diagram of the telephoto lens 1 focused on a distant view shown in Fig. 10D and Fig. 10B the simulation effect diagram of the telephoto lens 1 focused on a 50-mm close view shown in

[0473] in, Fig. 10C and Fig. 10D They all include the axial chromatic aberration curve diagram, astigmatism field curvature diagram and distortion diagram of the telephoto lens 1. Among them, the axial chromatic aberration curve diagram includes spherical aberration curves corresponding to different bands of the system (including 650nm, 610nm, 555nm, 510nm, 470nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate at the pupil. Fig. 10C and Fig. 10D The values ​​shown in the middle are all small. When focusing on the distant and near scenes, the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the telephoto lens 1 are well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig. 10C and Fig. 10D The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Fig. 10C and Fig. 10D The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0474] Please refer to Fig.11A and Fig. 11B , Fig.11A is a schematic diagram of the optical path when the camera module 10 focuses on a distant view in the eighth embodiment provided by the present application, Fig. 11B yes Fig.11A The illustrated diagram is a light path diagram of the camera module 10 when focusing on a close-up view of 50 mm. Fig.11A The camera module 10 shown includes Figure 3B Most of the technical features of the camera module 10 are shown. The following mainly describes the differences between the two, and most of the same contents between the two are not repeated.

[0475] In the eighth embodiment, the telephoto lens 1 includes five lenses. In addition, the first lens group G1 includes three lenses. Focusing is performed by moving the second lens group G2 and fixing the first lens group G1.

[0476] Specifically, in the eighth embodiment, the camera module 10 includes a telephoto lens 1, a filter 3 and a photosensitive element 2. The telephoto lens 1 includes a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The first lens group G1 has positive focal power, and the second lens group G2 has negative focal power. During the focusing process of the telephoto lens 1 switching between a distant view and a near view, the distance H3 between the first lens group G1 and the second lens group G2 changes.

[0477] In this embodiment, the first lens group G1 of the telephoto lens 1 includes a first lens L1, a second lens L2 and a third lens L3 arranged from the object side to the image side, and the second lens group G2 includes a fourth lens L4 and a fifth lens L5 arranged from the object side to the image side. Along the direction of the optical axis O, the light passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 in sequence, and then passes through the filter 3, and finally reaches the photosensitive element 2.

[0478] like Fig.11A As shown, when the telephoto lens 1 focuses on the distant view, the light reflected by the distant view object passes through the telephoto lens 1 and forms an image on the imaging surface, and the imaging surface falls on the photosensitive element 2, and the camera module 10 can capture the distant view image. Fig. 11B As shown, when the telephoto lens 1 focuses on the near-field, the second lens group G2 moves toward the image side along the optical axis O, and the light reflected by the near-field object passes through the telephoto lens 1 and is imaged on the imaging surface, and the imaging surface falls on the photosensitive element 2, so that the camera module 10 can capture near-field images.

[0479] like Fig.11A and Fig. 11B As shown, during the focusing process of the telephoto lens 1 switching from the distant view to the near view, the first lens group G1 does not move, the second lens group G2 moves toward the image side along the optical axis O, the distance H3 between the first lens group G1 and the second lens group G2 increases, and the effective focal length EFL of the telephoto lens 1 decreases. In addition, the distance between the first lens group G1 and the photosensitive element 2 remains unchanged, and the distance between the second lens group G2 and the photosensitive element 2 decreases. In the present application, when the telephoto lens 1 focuses on the distant view and the near view, the imaging plane falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging plane of the telephoto lens 1 remains unchanged, and the distance between the second lens group G2 and the imaging plane of the telephoto lens 1 decreases.

[0480] The following combines data and simulation results to present Fig.11A The telephoto lens 1 is shown as a concrete solution in a possible embodiment.

[0481] Please refer to Table 8a and Table 8b together. Table 8a is Fig.11AThe curvature radius, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 of the telephoto lens 1 in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface between the filter 3 and the photosensitive element 2, which is used to examine whether the light spot converges. Table 8b is Fig.11A Aspherical coefficients of various lenses of the telephoto lens 1 in a possible embodiment are shown.

[0482] Table 8a

[0483]

[0484]

[0485] Table 8b

[0486]

[0487] The aspherical surface of the telephoto lens 1 in Table 8a can be defined by, but not limited to, the following aspherical surface curve equation:

[0488]

[0489] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 8b.

[0490] Please refer to Table 8c and Table 8d. Table 8c and Table 8d are Fig.11A The basic parameters of the telephoto lens 1 in a possible embodiment are shown. f1 to f5 in Table 8c are the focal lengths of the first lens L1 to the fifth lens L5, respectively. F1 and F2 in Table 8d are the focal lengths of the first lens group G1 and the second lens group G2, respectively. T1 and T2 are the thicknesses of the first lens group G1 and the second lens group G2, respectively.

[0491] Table 8c

[0492] parameter f1 f2 f3 f4 f5 Aperture value Field of view Numeric 7.7 -12.1 12 -9 58.6 2 26°

[0493] Table 8d

[0494]

[0495] In this embodiment, when the telephoto lens 1 switches from a long-distance view to a close-up view, for example, when switching to focus on an object at 50 mm in the close-up, the second lens group G2 moves toward the image side, and the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2 mm. That is, the focusing stroke of the second lens group G2 moving toward the image side is 2 mm. Compared with a conventional lens (usually requiring more than 4 mm), the focusing stroke is significantly shortened, and the focusing ability is strong.

[0496] In addition, when the telephoto lens 1 focuses on a long-distance view, the effective focal length EFL of the telephoto lens 1 is 14.6 mm; when the telephoto lens 1 focuses on a close-up view, the effective focal length EFL of the telephoto lens 1 is 10.7 mm. During the focusing process of the telephoto lens 1 switching from a long-distance view to a close-up view, the effective focal length EFL of the telephoto lens 1 decreases.

[0497] In this embodiment, when the telephoto lens 1 switches from a long-distance view to a close-up view, the second lens group G2 moves toward the image side, and the distance (S6) between the first lens group G1 and the second lens group G2 increases by 2 mm. Correspondingly, the distance (S10) between the second lens group G2 and the filter 3 decreases by 2 mm to keep the height of the telephoto lens 1 unchanged.

[0498] In this embodiment, as shown in Table 8d, F1 < 0.9EFL (0.9EFL = 0.9 x 14.6 = 13.14), so the focal length F1 of the first lens group G1 is relatively small, and the light-gathering ability is strong, which is beneficial to achieving close-up shooting within 10 cm.

[0499] In addition, -EFL < F2, so the focal length F2 of the second lens group is relatively small, and the light-gathering ability is strong, which is convenient for focusing and shortens the motor stroke.

[0500] In addition, (F1 - F2) / F1 is approximately equal to 3, so the difference in the focal lengths of the two lens groups is small, which can improve the light-gathering ability of the telephoto lens 1 and is beneficial to achieving close-up imaging; and the focal length F2 of the second lens group G2 is relatively large, so that the degree of light deflection of the telephoto lens 1 can be reduced, the aberration can be reduced, and the imaging quality can be improved.

[0501] In addition, the focal length f1 of the first lens L1 is the focal length f11 of the first lens L11 of the first lens group G1. 0.5 < f1 / F1 < 1, that is, 0.5 < f11 / F1 < 1, so that the difference between the focal length f11 of the first lens L11 of the first lens group G1 and the focal length F1 of the first lens group G1 is small, which is convenient for adjusting the focal length f11 of the first lens L11 to obtain the focal length F1 of the first lens group G1.

[0502] In addition, the focal length f4 of the fourth lens L4 is the same as the focal length f21 of the first lens L21 of the second lens group G2. 0.2 < f4 / F2 < 1, that is, 0.2 < f21 / F2 < 1, making the focal length f21 of the first lens L21 of the second lens group G2 differ less from the focal length F2 of the second lens group G2, facilitating the adjustment of the focal length f21 of the first lens L21 to obtain the focal length F2 of the second lens group G2.

[0503] In addition, 0.3 < T1 / F1 < 1, then the thickness of the first lens group G1 is small, so that the height of the telephoto lens 1 can be reduced, facilitating storage; and facilitating the movement of the first lens group G1 to improve the imaging quality.

[0504] In addition, -1 < T2 / F2 < -0.1, which is conducive to making the second lens group G2 have a small thickness, thereby reducing the height of the telephoto lens 1 and facilitating storage; and facilitating the movement of the second lens group G2 to improve the imaging quality.

[0505] In addition, T1 + T2 = 7.96, 0.6EFL = 0.6 x 14.6 = 8.76, then T1 + T2 < 0.6EFL. The sum of the thickness T1 of the first lens group G1 and the thickness T2 of the second lens group G2 is small, making the overall height of the camera module 10 small when the telephoto lens 1 is in the storage state, and occupying a small space in the whole machine cavity of the electronic device 100, facilitating storage and being better applicable to thin electronic devices.

[0506] Please refer to Fig. 11C and Fig.11D , Fig. 11C is Fig.11A the simulation effect diagram of the telephoto lens 1 when focusing on a distant view as shown, Fig.11D is Fig. 11B the simulation effect diagram of the telephoto lens 1 when focusing on a close view of 50 mm as shown.

[0507] Among them, Fig. 11C and Fig.11D both include the axial chromatic aberration curve diagram, astigmatism field curvature diagram and distortion diagram of the telephoto lens 1. Among them, the axial chromatic aberration curve diagram includes spherical aberration curves corresponding to different bands of the system (the figure shows 650 nm, 610 nm, 555 nm, 510 nm, 470 nm); its physical meaning is that the light of the corresponding wavelength emitted from the 0-degree field of view, after passing through the optical system, deviates from the ideal image point; its abscissa is the deviation value along the optical axis direction, and the ordinate is the normalized coordinate at the pupil. Fig. 11C and Fig.11DThe values ​​shown in the middle are all small. When focusing on the distant and near scenes, the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of the telephoto lens 1 are well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig. 11C and Fig.11D The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point (actual image height) of the light beam in different fields of view and the ideal image height. Fig. 11C and Fig.11D The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0508] In the above embodiments, Figure 5A , Figure 5B , Fig. 9A , Fig. 9B , Figure 4A , Figure 4B , Fig. 8A , Figure 8B , Fig. 7A , Figure 7B , Fig. 6A , Figure 6B , Fig.11A , Fig. 11B , Fig. 10A and Fig. 10B The first lenses L1 of the first lens group G1 shown in FIG. 1 all correspond to Figure 3C The first lens L11 of the first lens group G1 and the second lens L2 of the first lens group G1 correspond to Figure 3C The second lens L12 of the first lens group G1 is shown. Figure 5A , Figure 5B , Fig. 9A , Fig. 9B , Figure 4A , Figure 4B , Fig. 8A , Figure 8B , Fig.11A , Fig. 11B , Fig. 10A and Fig. 10B The fourth lens L4 of the second lens group G2 shown in FIG. Fig. 7A , Figure 7B , Fig. 6A and Figure 6B The second lens group G2 and the fifth lens L5 shown in FIG. Figure 3C The first lens L21 of the second lens group G2 is shown.

[0509] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

Claims

1. A telephoto lens, characterized in that: The field of view angle of the telephoto lens is less than 60°; The telephoto lens includes a first lens group and a second lens group arranged from the object side to the image side. The number of lens groups of the telephoto lens is 2 groups. The number of lenses of the telephoto lens is 6 to 8 pieces. The number of lenses of both the first lens group and the second lens group is not less than 3 pieces; The first lens group has a positive optical power, and the second lens group has a negative optical power. During the focusing process of the telephoto lens switching between a long shot and a close shot, the distance between the first lens group and the second lens group changes. The closest focusing distance of the telephoto lens is within 10 cm; The first lens group includes a first lens close to the object side. The focal length f11 of the first lens of the first lens group and the focal length F1 of the first lens group satisfy: 0.6 < f11 / F1 < 1; The second lens group includes a first lens close to the object side. The focal length f21 of the first lens of the second lens group and the focal length F2 of the second lens group satisfy: 0.2 < f21 / F2 < 1; The thickness T1 of the first lens group, the thickness T2 of the second lens group, and the effective focal length EFL of the telephoto lens satisfy: 0.6EFL < T1 + T2 ≤ 0.8EFL, or 0.8EFL < T1 + T2 < EFL.

2. The telephoto lens according to claim 1, characterized in that: During the focusing process of the telephoto lens switching from a long shot to a close shot, the distance between the first lens group and the second lens group increases.

3. The telephoto lens according to claim 1 or 2, characterized in that: During the focusing process of the telephoto lens switching from a long shot to a close shot, the distance between the first lens group and the imaging plane of the telephoto lens remains unchanged, and the distance between the second lens group and the imaging plane of the telephoto lens decreases; Or, the distance between the first lens group and the imaging plane of the telephoto lens increases, and the distance between the second lens group and the imaging plane of the telephoto lens remains unchanged; Or, the distance between the first lens group and the imaging plane of the telephoto lens increases, and the distance between the second lens group and the imaging plane of the telephoto lens decreases.

4. The telephoto lens according to any one of claims 1 to 3, characterized in that: The focal length F1 of the first lens group and the effective focal length EFL of the telephoto lens satisfy: F1 ≤ 0.9EFL, or, 0.9EFL < F1 < EFL.

5. The telephoto lens according to any one of claims 1 to 3, characterized in that: The focal length F2 of the second lens group and the effective focal length EFL of the telephoto lens satisfy: -EFL < F2.

6. The telephoto lens according to claim 5, characterized in that: The focal length F1 of the first lens group and the focal length F2 of the second lens group satisfy: 1 < (F1 - F2) / F1 ≤ 3, or, 3 < (F1 - F2) / F1 < 9.

7. The telephoto lens according to claim 1, wherein: The first lens group further includes a second lens. The second lens of the first lens group is adjacent to the object side of the first lens of the first lens group. The sum of the Abbe number of the first lens of the first lens group and the Abbe number of the second lens of the first lens group is greater than 20.

8. The telephoto lens according to claim 1, wherein: The sum of the Abbe numbers of the multiple lenses of the second lens group is greater than 18.

9. The telephoto lens according to claim 1, wherein: The thickness T1 of the first lens group and the focal length F1 of the first lens group satisfy: 0.1 < T1 / F1 ≤ 0.3, or, 0.3 < T1 / F1 < 1; Alternatively, the thickness T2 of the second lens group and the focal length F2 of the second lens group satisfy: -1 < T2 / F2 < -0.

1.

10. The telephoto lens according to claim 1, wherein: The image height ImgH of the telephoto lens satisfies: ImgH > 2 mm.

11. A camera module, characterized in that: Comprising an image sensor, a first driving mechanism, and the telephoto lens according to any one of claims 1 to 10, the image sensor being located on the image side of the telephoto lens; the first driving mechanism is connected to the telephoto lens and is used to control the telephoto lens to move in a direction close to or away from the image sensor.

12. The camera module according to claim 11, characterized in that: The camera module further comprises a second driving mechanism, the second driving mechanism is connected to the first lens group and is used to control the first lens group to move along the optical axis; and / or the camera module further comprises a third driving mechanism, the third driving mechanism is connected to the second lens group and is used to control the second lens group to move along the optical axis.

13. An electronic device, characterized in that: Comprising an image processor and the camera module according to claim 11 or 12, the image processor is communicatively connected to the camera module, and the image processor is used to obtain an image signal from the camera module and process the image signal.

14. An electronic device, characterized in that: Comprising a first lens and a second lens, the second lens is a 3x optical zoom lens of the first lens; The field of view angle of the second lens is less than 60°; The second lens comprises a first lens group and a second lens group arranged from the object side to the image side, the number of lens groups of the telephoto lens is 2 groups, the number of lenses of the telephoto lens is 6 to 8 pieces, and the number of lenses of both the first lens group and the second lens group is not less than 3 pieces; The first lens group has a positive optical power, the second lens group has a negative optical power, during the focusing process of the second lens switching between a long shot and a close shot, the distance between the first lens group and the second lens group changes, and the closest focusing distance of the second lens is less than 10 cm; The first lens group comprises a first lens close to the object side, and the focal length f11 of the first lens of the first lens group and the focal length F1 of the first lens group satisfy: 0.6 < f11 / F1 < 1; The second lens group comprises a first lens close to the object side, and the focal length f21 of the first lens of the second lens group and the focal length F2 of the second lens group satisfy: 0.2 < f21 / F2 < 1; The thickness T1 of the first lens group, the thickness T2 of the second lens group, and the effective focal length EFL of the telephoto lens satisfy: 0.6EFL < T1 + T2 ≤ 0.8EFL, or 0.8EFL < T1 + T2 < EFL.

15. The electronic device according to claim 14, characterized in that: During the focusing process of the second lens switching from a long shot to a close shot, the distance between the first lens group and the imaging plane of the second lens remains unchanged, and the distance between the second lens group and the imaging plane of the second lens decreases; Alternatively, the distance between the first lens group and the imaging plane of the second lens increases, and the distance between the second lens group and the imaging plane of the second lens remains unchanged; Alternatively, the distance between the first lens group and the imaging plane of the second lens increases, and the distance between the second lens group and the imaging plane of the second lens decreases.

16. The electronic device according to claim 14, characterized in that: The focal length F1 of the first lens group and the effective focal length EFL of the second lens satisfy: F1 ≤ 0.9EFL, or, 0.9EFL < F1 < EFL.

17. The electronic device according to claim 14, characterized in that: The focal length F2 of the second lens group and the effective focal length EFL of the second lens satisfy: -EFL < F2.

18. The electronic device according to claim 14, characterized in that: The focal length F1 of the first lens group and the focal length F2 of the second lens group satisfy: 1 < (F1 - F2) / F1 ≤ 3, or, 3 < (F1 - F2) / F1 < 9.

19. The electronic device according to claim 14, characterized in that: The thickness T1 of the first lens group and the focal length F1 of the first lens group satisfy: 0.1 < T1 / F1 ≤ 0.3, or, 0.3 < T1 / F1 < 1; or the thickness T2 of the second lens group and the focal length F2 of the second lens group satisfy: -1 < T2 / F2 < -0.

1.

20. The electronic device according to any one of claims 14 to 19, characterized in that: The image height ImgH of the second lens satisfies: ImgH > 2 mm.

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