Telephoto lenses, camera modules and electronic devices

Abstract

A kind of long-focus lens (1), camera module (10) and electronic equipment (100).When focusing on long shot, the field of view FOV of long-focus lens (1) is less than 60 °.Long-focus lens (1) includes first lens group (G1) and second lens group (G2) arranged along object side to image side, first lens group (G1) has positive focal power, second lens group (G2) has negative focal power, the distance between first lens group (G1) and second lens group (G2) changes in the focusing process that long-focus lens (1) switches between long shot and close shot.Long-focus lens (1) can realize long shot and high imaging quality, and also can have strong close shot ability, realize wide zoom imaging from long shot to close shot.

Description

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

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

[0003] Existing telephoto lenses are mainly used for shooting distant scenes. When shooting distant objects or objects that are difficult to approach, telephoto lenses can reveal details of distant subjects and have good capabilities for shooting distant scenes. However, existing telephoto lenses have poor image quality when shooting close-ups, which limits their application in close-up shooting scenarios. Summary of the Invention

[0004] This application provides a telephoto lens, a camera module, and an electronic device. The telephoto lens can achieve both long-distance shooting with high image quality and strong close-up shooting capabilities, enabling wide-range imaging from distant to close-up views.

[0005] In a first aspect, this application provides a telephoto lens. When the telephoto lens focuses on a distant scene, 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 positive optical power, and the second lens group has negative optical power. During the focusing process of the telephoto lens switching between distant and near scenes, the distance between the first lens group and the second lens group changes, and the closest focusing distance of the telephoto lens is less than 10 centimeters.

[0006] The telephoto lens provided in this application can achieve both long-distance shooting with high image quality and strong close-up shooting capabilities, enabling wide-range imaging from distant to close-up views.

[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 less than the effective focal length (EFL) of the telephoto lens, thereby reducing the height of the telephoto lens and facilitating the miniaturization of the camera module.

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

[0009] In this implementation, during the focusing process of the telephoto lens switching from a long-distance view to a close-up view, the distance between the first lens group and the second lens group increases, enabling higher close-up imaging quality. In some other implementations, during the focusing process of the telephoto lens 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 this application does not limit this.

[0010] In some implementations, during the focusing process of the telephoto lens 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, a single-group focusing method can be adopted to simplify the movement mode 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 mode 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 conducive to reducing the light turning angle, reducing aberration, and improving imaging quality. When the second lens group remains stationary and focusing is performed by moving the first lens group, the movement mode 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, 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 can also improve the movement accuracy of the first lens group and the second lens group, enhancing the focusing ability of the telephoto lens.

[0015] In some implementations, 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, by setting F1 ≤ 0.9EFL, or, 0.9EFL < F1 < EFL, the focal length of the first lens group is relatively small, and its light converging ability is strong, enabling the telephoto lens to be used for close-up shooting within 10 centimeters.

[0017] In some implementations, 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 - scene 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 - scene 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 the 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 multiple lenses of the second lens group is greater than 18.

[0030] In this implementation, the sum of the Abbe numbers of 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 < T / 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, improving 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, improving 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 thicknesses of the first lens group and 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, facilitating storage and being better applicable 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 strong long-distance shooting capabilities 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 both achieve long-distance shooting with high imaging quality and have strong close-up shooting capabilities, realizing wide object distance imaging from long-distance to close-up.

[0040] The telephoto lens provided by the present application can both achieve long-distance shooting with high imaging quality and have strong close-up shooting capabilities, 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, realizing the switching of the telephoto lens between the long-distance mode and the close-up mode.

[0045] In addition, the third drive mechanism is used to control the movement of the second lens group along the optical axis to change the distance between the first lens group and the second lens group, thereby enabling the telephoto lens to switch between distant and close-up modes.

[0046] Thirdly, this application also provides an electronic device, including an image processor and a camera module. The image processor is communicatively connected to the camera module and is used to acquire and process image signals from the camera module. The electronic device provided by this application can achieve both long-distance shooting with high image quality and strong close-up shooting capabilities, realizing wide-range imaging from distant to close-up views.

[0047] Fourthly, this application also provides an electronic device, including a first lens and a second lens, wherein the second lens is a 3x optical zoom lens of the first lens; when the second lens focuses on a distant scene, the field of view of the second lens is less than 60°; the second lens includes a first lens group and a second lens group arranged from the object side to the image side, the first lens group having positive optical power and the second lens group having negative optical power; during the focusing process of the second lens switching between distant and near scenes, 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 this application can achieve both long-distance shooting with high image quality and strong close-up shooting capability, realizing wide-range imaging from far to near.

[0049] In some implementations, during the focusing process of the second lens switching from a distant view to a close-up view, the distance between the first lens group and the imaging surface of the second lens remains unchanged, while the distance between the second lens group and the imaging surface of the second lens decreases.

[0050] Alternatively, the distance between the imaging surfaces of the first lens group and the second lens increases, while the distance between the imaging surfaces of the second lens group and the second lens remains unchanged;

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

[0052] In this implementation, a single-group focusing method can be used, simplifying the movement of the focusing structure and the focusing method. Specifically, the first lens group remains stationary, while focusing is performed by moving the second lens group. This simplifies the movement of the focusing structure in a telephoto lens, thereby simplifying the focusing method. Furthermore, the first lens group is located on the object side of the second lens group, increasing the movable optical path space, which helps to reduce the light reversal angle, reduce aberrations, and improve image quality. The fact that focusing is performed by moving the first lens group while the second lens group remains stationary further simplifies the movement of the focusing structure in a telephoto lens, thus simplifying the focusing method.

[0053] In addition, a dual-group focusing method can 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, and also 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 the light converging 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 a relatively strong light converging ability, facilitating 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 converging ability of the telephoto lens will be enhanced, which is beneficial to achieving close-up imaging; but it will increase the degree of light deflection of the telephoto lens, increase the aberration, 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 converging ability of the telephoto lens will be reduced, which is not conducive to achieving close-up imaging; but it will reduce the degree of light deflection of the telephoto lens, reduce the 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 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 camera module shown in some application scenarios;

[0070] Figure 2 is Figure 1A The diagram shows a structural schematic of a camera module in some embodiments.

[0071] Figure 3A yes Figure 2 The diagram shows the structure of the camera module in its stowed state.

[0072] Figure 3B yes Figure 3A The diagram shows the structure of the camera module in its pop-up state.

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

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

[0075] Figure 4B yes Figure 4A The diagram shows the optical path of the camera module when focusing on a close-up at 50mm.

[0076] Figure 4C yes Figure 4A The image shown is a simulation of a telephoto lens focusing on a distant scene.

[0077] Figure 4D yes Figure 4B The image shown is a simulation of a telephoto lens focusing on a close-up at 50mm.

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

[0079] Figure 5B yes Figure 5A The diagram shows the optical path of the camera module when focusing on a close-up at 50mm.

[0080] Figure 5C yes Figure 5A The image shown is a simulation of a telephoto lens focusing on a distant scene.

[0081] Figure 5D yes Figure 5B The image shown is a simulation of a telephoto lens focusing on a close-up at 50mm.

[0082] Figure 6A This is a schematic diagram of the optical path when the camera module focuses on a distant scene in the third embodiment provided in this application;

[0083] Figure 6B yes Figure 6A The diagram shows the optical path of the camera module when focusing on a close-up at 50mm.

[0084] Figure 6C yes Figure 6A The image shown is a simulation of a telephoto lens focusing on a distant scene.

[0085] Figure 6D yes Figure 6B The image shown is a simulation of a telephoto lens focusing on a close-up at 50mm.

[0086] Figure 7A This is a schematic diagram of the optical path when the camera module focuses on a distant scene in the fourth embodiment provided in this application;

[0087] Figure 7B yes Figure 7A The diagram shows the optical path of the camera module when focusing on a close-up at 50mm.

[0088] Figure 7C yes Figure 7A The image shown is a simulation of a telephoto lens focusing on a distant scene.

[0089] Figure 7D yes Figure 7B The image shown is a simulation of a telephoto lens focusing on a close-up at 50mm.

[0090] Figure 8A This is a schematic diagram of the optical path when the camera module focuses on a distant scene in the fifth embodiment provided in this application;

[0091] Figure 8B yes Figure 8A The diagram shows the optical path of the camera module when focusing on a close-up at 50mm.

[0092] Figure 8C yes Figure 8A The image shown is a simulation of a telephoto lens focusing on a distant scene.

[0093] Figure 8D yes Figure 8B The image shown is a simulation of a telephoto lens focusing on a close-up at 50mm.

[0094] Figure 9A This is a schematic diagram of the optical path when the camera module focuses on a distant scene in the sixth embodiment provided in this application;

[0095] Figure 9B yes Figure 9A The diagram shows the optical path of the camera module when focusing on a close-up at 50mm.

[0096] Figure 9C yes Figure 9A The image shown is a simulation of a telephoto lens focusing on a distant scene.

[0097] Figure 9D yes Figure 9B The image shown is a simulation of a telephoto lens focusing on a close-up at 50mm.

[0098] Figure 10A This is a schematic diagram of the optical path when the camera module focuses on a distant scene in the seventh embodiment provided in this application;

[0099] Figure 10B yes Figure 10A The diagram shows the optical path of the camera module when focusing on a close-up at 50mm.

[0100] Figure 10C yes Figure 10A The image shown is a simulation of a telephoto lens focusing on a distant scene.

[0101] Figure 10D yes Figure 10B The image shown is a simulation of a telephoto lens focusing on a close-up at 50mm.

[0102] Figure 11A This is a schematic diagram of the optical path when the camera module focuses on a distant scene in the eighth embodiment provided in this application;

[0103] Figure 11B yes Figure 11A The diagram shows the optical path of the camera module when focusing on a close-up at 50mm.

[0104] Figure 11C yes Figure 11A The image shown is a simulation of a telephoto lens focusing on a distant scene.

[0105] Figure 11D yes Figure 11B The image shown is a simulation of a telephoto lens when focusing on a close-up at 50mm. Detailed Implementation

[0106] For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be 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 rays.

[0108] A lens or lens group with positive optical power, having a positive focal length, and having 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 perpendicular distance from the optical center of a lens or lens group to the image-side focal plane when a sharp image of an object at infinity is formed. From a practical perspective, it can be understood as the distance from the center of the lens to a plane when the object is at infinity. For prime lenses, the position of their optical center remains constant; for telephoto lenses, changes in the optical center result in changes in the focal length.

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

[0112] The object side is defined by the lens; the side where the object is located is called the object side, and the surface of the lens closest to the object side is called the object side surface.

[0113] The image side is the side on which the image of the object is located, with the lens as the boundary. The surface of the lens closest to the image side is called the image side surface.

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

[0115] An aperture diaphragm is a device used to control the amount of light passing through the lens and entering the sensor inside the camera body; it is usually located inside the lens.

[0116] Aperture value, also known as F-number (Fno), is a relative value derived from the lens's focal length divided by the lens's entrance pupil diameter (the reciprocal of the relative aperture). A smaller aperture value allows more light to enter the lens in the same unit of time. A larger aperture value results in a shallower depth of field, blurring the background and creating an effect similar to a telephoto lens.

[0117] Total track length (TTL) refers to the total length from the surface of the lens closest to the object to the image plane. TTL is a major factor in determining camera height.

[0118] The imaging plane is located on the image side of all lenses in a 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 between the two edges of an optical instrument, with the lens of the instrument as the vertex, representing the maximum range through which the image of the subject can pass through the lens.

[0120] The optical axis is a perpendicular axis passing through the center of a lens. The lens optical axis is the axis passing through the centers of each lens element. When light rays parallel to the optical axis enter a convex lens, an ideal convex lens should have all the light rays converging at a single point behind the lens; this point where all the light rays converge is called the focal point.

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

[0122] The image-side focal plane, also known as the back focal plane or the second focal plane, is a plane that passes through the image-side focal point (also known as the back focal point or the second focal point) and is perpendicular to the optical axis of the system.

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

[0124] Aberrations: The paraxial region of an optical system has the properties of an ideal optical system, where paraxial rays emitted from a point on an object intersect the image plane at a single point (i.e., the paraxial image point). However, in reality, light rays passing through different apertures of a lens rarely intersect perfectly at a single point, but rather deviate from the position of the paraxial image point. These differences are collectively referred to as aberrations.

[0125] Axial spherical aberration, also known as longitudinal chromatic aberration, positional chromatic aberration, or axial aberration, occurs when a beam of light parallel to the optical axis converges at different positions after passing through a lens. This aberration is called positional chromatic aberration or axial chromatic aberration because the lens images different wavelengths of light at different positions, causing the image-side focal planes of different colors of light to not coincide in the final image, resulting in the dispersion of polychromatic light.

[0126] Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical system relative to the object itself. Distortion occurs due to the spherical aberration of the aperture. The height of the intersection point between the principal ray from different fields of view and the Gaussian image plane is not equal to the ideal image height; this difference is the distortion. Therefore, distortion only changes the imaging position of an off-axis object point on the ideal plane, causing a distortion in the image shape, but it does not affect the image's sharpness.

[0127] Image height (ImgH) represents half the diagonal length of the effective pixel area on the image sensor, which is also the image height of the imaging surface.

[0128] Astigmatism occurs because the object point is not on the optical axis of the optical system, and the emitted beam of light has an angle with the optical axis. After refraction by a lens, the convergence points of the meridional and sagittal beams are not at the same point. That is, the beam cannot be focused on a single point, resulting in an unclear image, hence astigmatism. The meridional and sagittal beams are the names of beams in two perpendicular planes within a rotationally symmetric optical system.

[0129] Field curvature refers to the difference in optical axis between the position of the sharpest image point after rays from the off-center field of view pass through an optical lens assembly and the position of the sharpest image point in the center field of view. When a lens has field curvature, the intersection of the entire beam does not coincide with the ideal image point. Although a sharp image point can be obtained at each specific point, the entire image plane is a curved surface.

[0130] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; the word "and / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

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

[0132] This application provides an electronic device. The electronic device can be a mobile phone, tablet, laptop, television, in-vehicle device, wearable device, video surveillance equipment, or other electronic product with photography or video recording capabilities. Wearable devices can be smart bracelets, smartwatches, wireless headphones, augmented reality (AR) glasses, augmented reality headsets, virtual reality (VR) glasses, and virtual reality headsets, etc. This application uses a mobile phone as an example for illustration.

[0133] Please see Figure 1A , Figure 1A This is a schematic diagram of the structure of the electronic device 100 provided in some embodiments of this 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). The back cover 30 and the display screen are fixed opposite to each other on both sides of the frame 40, and the back cover 30, the display screen, and the frame 40 together enclose the entire internal cavity of the electronic device 100. The display screen can be used to display images and can also integrate touch functionality to achieve human-computer interaction. The camera module 10 is housed within the internal cavity and is used to collect optical information from outside the electronic device 100 and form corresponding image signals. The image processor 20 is communicatively connected to the camera module 10 and is used to acquire and process image signals from the camera module 10. The communication connection between the camera module 10 and the image processor 20 can include data transmission via electrical connections such as wiring, or data transmission via coupling. It is understood that the camera module 10 and the image processor 20 can also be connected via other methods capable of data transmission.

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

[0136] In some other embodiments, the camera module 10 can also serve as a front-facing camera of the electronic device 100. For example, the display screen may have a light-transmitting area, through which the camera module 10 can collect optical information from the outside of the electronic device 100. In this embodiment, the camera module 10 is used as a front-facing camera module of the electronic device 100. That is, the camera module 10 can be used as a front-facing camera module of the electronic device 100, or it can be used as a rear-facing camera module of the electronic device 100; this application does not strictly limit this.

[0137] For example, such as 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 located at the left and right ends of the upper part, respectively. It is understood that the directional terms such as "upper," "lower," "left," and "right" used in this application are descriptions of the orientation with reference to the accompanying drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0138] also, Figure 1AThe installation position of the camera module 10 in the illustrated embodiment of the electronic device 100 is merely illustrative, and this 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 in other positions of the electronic device 100, such as in the upper middle or upper second end of the electronic device 100, or in the middle or lower left or lower right end of the electronic device 100.

[0139] In some other embodiments, the electronic device 100 may also include a terminal body and an auxiliary component that can rotate, move or be detached 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 known 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. The image processor 20 then processes the digital image signal to obtain a processed image signal, which 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 communicatively connected to the image processor 20. The image processor 20 transmits the processed image signal to the memory so that the processed image signal can be retrieved from the memory and displayed on the screen at any time when the image needs to be viewed later. In some embodiments, the image processor 20 may also compress the processed image signal before storing it in the memory to save memory space.

[0142] Please see Figure 1B , Figure 1B yes Figure 1A The diagram shows the field of view (FOV) of the camera module 10 in some application scenarios.

[0143] For example, the camera module 10 may include a first lens (not shown) and a second lens (not shown). The first lens can serve as the main camera lens. In this application, the first lens corresponds to a 1x (i.e., 1x) optical zoom. The second lens can be a telephoto lens, specifically a 3x (i.e., 3x) optical zoom lens of the first lens, meaning the second lens corresponds to a 3x (i.e., 3x) optical zoom. Understandably, optical zoom is primarily achieved by switching between lenses with different optical zoom magnifications within the camera module. The optical zoom magnification of a lens indicates its optical zoom capability; the higher the optical zoom magnification, the farther away the scene can be captured.

[0144] like Figure 1B As shown, when the camera module 10 is shooting at a distance, a second lens can be used, and the field of view (FOV) of the second lens can be 40°. In this embodiment, the FOV of the second lens is less than 60°. When the camera module 10 is shooting in a standard manner, a first lens can be used, and the FOV of the first lens can be 80°. In this embodiment, the FOV of the first lens can be greater than 60° and less than 120°. When the camera module 10 is shooting at a close distance, a second lens can also be used, and the FOV of the second lens can be 120°.

[0145] Please see Figure 2 , Figure 2 yes Figure 1A The diagram shows the structure 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 other embodiments, the second lens of the camera module 10 may have other structures, which are not limited in this application. Figure 2 The structure within the dashed line is a schematic structure of the telephoto lens 1 in some embodiments. The telephoto lens 1 in this application may also have other structures, and the drawings should not be regarded as a limitation on 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), to which the photosensitive element 2 can be fixed. Light can pass through the telephoto lens 1 and illuminate the photosensitive element 2. Exemplarily, the working principle of the camera module 10 is as follows: light reflected from the subject passes through the telephoto lens 1 to generate an optical image, which is projected onto the photosensitive element 2. The photosensitive element 2 converts the optical image into an electrical signal, i.e., an analog image signal, and transmits it to an analog-to-digital converter (ADC) to convert it into a digital image signal for the image processor 20.

[0148] The photosensitive element 2 (also known as the image sensor) is a semiconductor chip containing hundreds of thousands to millions of photodiodes on its surface. When illuminated, these photodiodes generate electrical charges. The photosensitive element 2 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. CCDs are made using a highly sensitive semiconductor material that converts light into electrical charges. They consist of many photosensitive units, typically measured in megapixels. When light illuminates the surface of a CCD, each photosensitive unit reflects a charge onto the component. The signals generated by all the photosensitive units are combined to form a complete image. CMOS devices primarily utilize semiconductors made of silicon and germanium, allowing N-type (negative) and P-type (positive) semiconductors to coexist on the device. The current generated by these complementary effects can be recorded and interpreted by the processing chip as an image.

[0149] In some embodiments, the photosensitive element 2 can move in 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 image stabilization. In this case, the photosensitive element 2 does not have the ability to move in the direction parallel to the thickness direction of the camera module 10, or has a very small travel distance much smaller than the focusing stroke, to reduce the module thickness. In other embodiments, the photosensitive element 2 can also be a fixed component.

[0150] The telephoto lens 1 primarily utilizes the refraction principle of lenses for imaging. Light from the scene passes through the telephoto lens 1, forming a clear image on the imaging surface, which is then recorded by the photosensitive element 2 located on the imaging surface. For example, when the telephoto lens 1 focuses on an object at a distance greater than 100 meters (i.e., focusing on a distant scene), the field of view (FOV) of the telephoto lens 1 is less than 60°. For instance, the half-field of view (HFOV) can satisfy tan(HFOV) < 0.5, meaning the FOV can be 53°, or it can be 45°, 50°, 54°, etc. Furthermore, the image height (ImgH) of the telephoto lens 1 is greater than 2 mm, meaning the diagonal size of the photosensitive element in the telephoto lens 1 is greater than 4 mm. For example, the diagonal size of the photosensitive element in the telephoto lens 1 can be 5 mm, 6 mm, or 8 mm, etc. In this application, the telephoto lens 1 has a small field of view and a large surface area, enabling strong long-distance shooting capabilities and high image quality in long-distance shooting. The half-field of view (HFOV) is half of the maximum field of view of the telephoto lens 1. In this application, an object distance greater than 100 meters is considered long-distance shooting, and an object distance less than 10 centimeters is considered close-up shooting. Furthermore, the closest focusing distance of the telephoto lens 1 is less than 10 centimeters to achieve macro shooting.

[0151] The telephoto lens 1 can be a vertical lens or a periscope lens. In this embodiment, the telephoto lens 1 is described as a vertical lens.

[0152] In some embodiments, the camera module 10 may further include a light filter 3. The light filter 3 may be located between the telephoto lens 1 and the photosensitive element 2, used to filter out unwanted wavelengths of light, preventing the photosensitive element 2 from producing false colors or ripples, thereby improving its effective resolution and color reproduction. For example, the light filter 3 may be an infrared filter. In this embodiment, the light filter 3 is a separate component. In other embodiments, the light filter 3 may be omitted, and filtering may be achieved by surface treatment or material treatment of at least one optical element of the telephoto lens 1. This application does not strictly limit the specific embodiments of the structure or component used to achieve light filtering.

[0153] Please refer to the following: Figure 3A and Figure 3B , Figure 3A yes Figure 2 The diagram shown is a structural schematic of the camera module 10 in its stowed state. Figure 3B yes Figure 3A The diagram shows the structure of the camera module 10 in the pop-up state.

[0154] like Figure 3A As shown, the telephoto lens 1 can be moved to a retracted state; as Figure 3BAs shown, the telephoto lens 1 can be moved to a pop-up state. When the telephoto lens 1 is in the retracted 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 1mm, such as 0.1mm, 0.5mm, etc. When the telephoto lens 1 is in the retracted state, the overall height of the camera module 10 is small, and it occupies less space in the internal cavity of the electronic device 100, which facilitates storage and makes it more suitable for thin electronic devices. In addition, setting the first distance H1 between the telephoto lens 1 and the filter 3 avoids damage to the telephoto lens 1 and the filter 3 due to collision or scratch when the telephoto lens 1 is in the retracted state, thereby extending the service life of the camera module 10. 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 retracted 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 achieve focusing. In this embodiment, the second distance H2 between the telephoto lens 1 and the filter 3 provides sufficient space for the telephoto lens 1 to move relative to the photosensitive element 2, thereby achieving focusing.

[0156] In some embodiments, the telephoto lens 1 may include multiple single lenses, such as five, six, or seven lenses. These single lenses are spaced apart. During the process of moving the telephoto lens 1 from a retracted state to a pop-up state, or from a pop-up state to a retracted state, or during focusing in long-distance 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 the following: Figure 3B and Figure 3C , Figure 3C yes Figure 3A The diagram shown illustrates the structure of the camera module 10 in another pop-up state. Figure 3B The camera module 10 shown is in long-range shooting mode. Figure 3C The camera module 10 shown is in close-up shooting mode. Among them, Figure 3B and Figure 3C The structure within the dashed 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 this application may also have other structures, and the drawings should not be regarded as a limitation on the structure 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 switch between distant and close-up views.

[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. For example... Figure 3B and Figure 3C As shown, during the focusing process of telephoto lens 1 switching from a distant view to a close-up view, the distance H3 between the first lens group G1 and the second lens group G2 increases. Conversely, during the focusing process of telephoto lens 1 switching from a close-up view to a distant view, the distance H3 between the first lens group G1 and the second lens group G2 decreases. Therefore, during the focusing process of telephoto lens 1 switching between distant and close-up views, the distance H3 between the first lens group G1 and the second lens group G2 changes.

[0160] In this application, by changing the distance H3 between the first lens group G1 and the second lens group G2, the telephoto lens 1 can achieve both long-distance shooting with high image quality and strong close-up shooting capability, thus realizing wide object distance imaging from far to near.

[0161] Furthermore, during the focusing process of the telephoto lens 1 switching from a distant view to a close-up view, the distance H3 between the first lens group G1 and the second lens group G2 increases, resulting in higher close-up image quality. In some other embodiments, the distance H3 between the first lens group G1 and the second lens group G2 may also decrease during the focusing process of the telephoto lens 1 switching from a distant view to a close-up view; this application does not limit this to any particular embodiment.

[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, thereby reducing the height of the telephoto lens 1 and facilitating the miniaturization of the camera module 10.

[0163] In this application, the telephoto lens 1 has strong wide-range focusing capability, enabling it to capture not only distant scenes but also close-up shots within 10 centimeters, with high image clarity and quality. Furthermore, by rationally configuring the optical power of the first lens group G1 and the second lens group G2, the telephoto lens 1 achieves a relatively small height, which is beneficial for the miniaturization of the camera module 10.

[0164] In some embodiments, during the focusing process of the telephoto lens 1 switching from a distant view to a close-up view, the combined focal length of the first lens group G1 and the second lens group G2, i.e., the effective focal length (EFL) of the telephoto lens 1, decreases. In other embodiments, the effective focal length (EFL) of the telephoto lens 1 may also increase during the focusing process of the telephoto lens 1 switching from a distant view to a close-up view.

[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 this 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, which can reduce the height of the telephoto lens 1, facilitating 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 installed in a first lens barrel (not shown in the figure), and multiple lenses of the second lens group G2 can be installed in 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 installed in 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 it is also convenient for 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 shot, 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 shot, 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 along the optical axis O towards the object side, while the second lens group G2 remains stationary, thereby increasing 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, increasing the movable optical path space, which helps to reduce the light reversal angle, reduce aberrations, and improve image quality. Furthermore, by keeping the second lens group G2 stationary and focusing by moving the first lens group G1, the movement of the focusing structure of the telephoto lens 1 can be simplified, thus simplifying the focusing method.

[0174] In this embodiment, the distance between the first lens group G1 and the photosensitive element 2 is increased, while 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 a distant or near scene, the imaging surface falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging surface of the telephoto lens 1 is increased, while the distance between the second lens group G2 and the imaging surface of the telephoto lens 1 remains unchanged.

[0175] In other embodiments, a dual-group focusing method can be employed to reduce the focusing travel of the first lens group G1 and the second lens group G2, thereby improving the motion accuracy of the first lens group G1 and the second lens group G2 and enhancing the focusing capability of the telephoto lens 1. For example, 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, both the first lens group G1 and the second lens group G2 are movable, which reduces the focusing travel of each of the first lens group G1 and the second lens group G2, and also improves the motion accuracy of the first lens group G1 and the second lens group G2, enhancing the focusing capability of the telephoto lens 1. Furthermore, the movable nature of both lens groups further increases the movable optical path space, which is more conducive to reducing the light reversal angle, reducing aberrations, and further improving image quality.

[0176] In this embodiment, the distances between the first lens group G1 and the second lens group G2 and the photosensitive element 2 both change. In this application, when the telephoto lens 1 focuses on a distant or near scene, the imaging surface 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 surface both change.

[0177] For example, the movement of the first lens group G1 and the second lens group G2 relative to the photosensitive element 2 can be such 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 this application, when the telephoto lens 1 focuses on a distant or near scene, the imaging surface falls on the photosensitive element 2, that is, the distance between the first lens group G1 and the imaging surface of the telephoto lens 1 increases, and the distance between the second lens group G2 and the imaging surface 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, and the present application does not limit this.

[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, the light converging ability is stronger, and it can be used for close-range 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 storage 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-out state, the spring does not undergo elastic deformation or has only minor elastic deformation, remaining in its natural state. When the telephoto lens 1 is in the retracted state, the spring undergoes elastic deformation or the amount of elastic deformation increases, remaining in a compressed state. During the process of the telephoto lens 1 changing from the retracted state to the pop-out state, the amount of elastic deformation of the spring decreases or the spring returns to its natural state, thereby generating an elastic force. Driven by this elastic force, the telephoto lens 1 pops out from the retracted state. Furthermore, the first driving mechanism can also employ 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 first lens group G1 to move along the optical axis O to change the distance H3 between the first lens group G1 and the second lens group G2, thereby enabling the telephoto lens 1 to switch between distant view mode and close view mode.

[0183] For example, the second drive mechanism can be a focusing motor, such as a voice coil motor, a memory metal motor, a ceramic motor, or a stepper motor. Alternatively, the second drive mechanism can also employ other structures, which are not limited in this 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 second lens group G2 to move along the optical axis O to change the distance H3 between the first lens group G1 and the second lens group G2, thereby enabling the telephoto lens 1 to switch between distant and close-up modes.

[0185] For example, the third drive mechanism can be a focusing motor, such as a voice coil motor, a memory metal motor, a ceramic motor, or a stepper motor. Alternatively, the third drive mechanism can also employ other structures, which are not limited in this application.

[0186] In some embodiments, the camera module 10 may further include a second driving mechanism and a third driving mechanism. 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, thereby changing the distance H3 between the first lens group G1 and the second lens group G2, and realizing the switching between the telephoto lens 1 in distant view mode and close view mode. In this embodiment, by driving the first lens group G1 and the second lens group G2 to move through two driving mechanisms respectively, the focusing stroke 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 enhancing the focusing capability of the telephoto lens 1.

[0187] For example, the second drive mechanism can be a focusing motor, such as a voice coil motor, a shape memory metal motor, a ceramic motor, or a stepper motor. The third drive mechanism can also be a focusing motor, such as a voice coil motor, a shape memory metal motor, a ceramic motor, or a stepper motor. Furthermore, the second and / or third drive mechanisms can also employ other structures, which are not limited in this application. In this embodiment, the structures of the second and third drive mechanisms can be the same or different, which are not limited in this application.

[0188] In some embodiments, the camera module 10 may further include a first driving mechanism and a second and / or a third driving mechanism. The first driving mechanism is connected to the telephoto lens 1 and controls the telephoto lens 1 to move towards or away from the photosensitive element 2, thereby enabling the telephoto lens 1 to be retracted and extended, and also enabling long-range focusing. The second driving mechanism is connected to the first lens group G1 and controls 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 controls the second lens group G2 to move along the optical axis O, thereby changing the distance H3 between the first lens group G1 and the second lens group G2, and enabling the telephoto lens 1 to switch between long-range and close-range modes.

[0189] For example, the first drive mechanism can be a focusing motor, such as a voice coil motor, a shape memory metal motor, a ceramic motor, or a stepper motor. The second drive mechanism can be a focusing motor, such as a voice coil motor, a shape memory metal motor, a ceramic motor, or a stepper motor. The third drive mechanism can be a focusing motor, such as a voice coil motor, a shape memory metal motor, a ceramic motor, or a stepper motor. Furthermore, one, two, or all three of the first, second, and third drive mechanisms can also employ other structures, and this application does not limit this. In this embodiment, the structures of the first, second, and third drive mechanisms can be the same, or at least one of the first, second, and third drive mechanisms can have a structure different from the structures of other mechanisms, and this application does not limit this.

[0190] In some embodiments, the camera module 10 may also include a stabilization motor (not shown). The stabilization 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 stabilization motor may be a shape memory alloy motor, a suspension motor, or 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 close-up shooting within 10 cm. The first lens group G1 has a positive optical 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 close-up shooting 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 optical 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 optical 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 for easy storage; and the focal length of the second lens group G2 is relatively small, and its light converging ability is relatively strong, which is convenient for focusing and reduces the motor stroke. 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 both lens groups have relatively small focal lengths and the difference between them is small (i.e., the (F1-F2) / F1 ratio is small), the telephoto lens 1's ability to converge light is improved, which is beneficial for close-up imaging. However, it also increases the refraction of light by the telephoto lens 1, increasing aberrations and potentially resulting in blurry images and poor image quality. Conversely, when the second lens group G2 has a larger focal length F2 and a significant difference in focal length F1 compared to the first lens group G1 (i.e., the (F1-F2) / F1 ratio is large), the telephoto lens 1's ability to converge light is reduced, which is detrimental to close-up imaging. However, it reduces the refraction of light by the telephoto lens 1, reducing aberrations and improving image 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 aforementioned limitations 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 limitations on the ratio range of 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 exist independently or in combination. When the above three ratio ranges are combined, the telephoto lens 1 can achieve a smaller size, as well as better focusing ability and image 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 image quality. Exemplarily, the first lens group G1 may include two to four lenses, such as three or four. 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 image quality. For example, the second lens group G2 may include two to four lenses, such as two, three, or four lenses. In other embodiments, the second lens group G2 may also include a single lens, which is not limited herein. For example, 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, such as 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 numbers of the first lens L11 and 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 based on 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 can 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 can 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 can be made of glass. For example, the first lens L11 of the first lens group G1 can be made of glass, and other lenses can be made of resin, so as to not only ensure the imaging quality and low temperature drift characteristics of the telephoto lens 1, but also reduce the weight of the lens group and improve the focusing ability of the telephoto lens 1.

[0209] Exemplarily, multiple lenses of the first lens group G1 can 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 can 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 can 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 can also be made of glass. For example, the first lens L21 of the second lens group G2 can be made of glass, and other lenses can be made of resin, so as to not only ensure the imaging quality and low temperature drift characteristics of the telephoto lens 1, but also reduce the weight of the lens group and improve the focusing ability of the telephoto lens 1.

[0212] Exemplarily, multiple lenses of the second lens group G2 can 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, which can be mounted on the first lens group G1. In this case, the aperture adjustment effect of the aperture stop 4 is better, improving the image quality of the telephoto lens 1. For example, the aperture stop 4 can be mounted on the end of the first lens group G1 near the object side. In this embodiment, the first lens L11 with the aperture stop 4 mounted on the first lens group G1 is used as an example. In other embodiments, the aperture stop 4 can also be mounted on other lenses of the first lens group G1, the second lens group G2, or other positions of the telephoto lens 1; this application does not strictly limit this.

[0214] The aperture stop 4 can be a spacer structure or a variable fan blade structure; alternatively, the aperture stop 4 can be achieved through a surface coating process, such as forming the aperture stop 4 by spraying a light-shielding material onto the lens. The position of the aperture stop 4 can be fixed or variable. For example, the position of the aperture stop 4 can be variable, adjusting its position according to focusing conditions to be located between different lenses.

[0215] In some embodiments, the optical surface of at least one lens of the telephoto lens 1 is aspherical. The aspherical optical surface has different optical powers from the paraxial region to the outer field of view, thereby achieving more uniform image quality. And / or, the optical surface of at least one lens of the telephoto lens 1 can be a freeform surface to correct aberrations. Wherein, the aspherical surface is a surface that is rotationally symmetrical about the optical axis O; the freeform surface may have no axis of symmetry, or it may be symmetrical along a certain direction, or symmetrical along two directions.

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

[0217] In some embodiments, the optical surface of at least one lens of the telephoto lens 1 can be formed with a diffraction grating structure. In this embodiment, by reasonably setting the diffraction grating structure, chromatic aberration can be reduced, and the size 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 focusing effect can be enhanced by the liquid lens to achieve ultra-close-up shooting. The liquid lens is a structural component that uses liquid as a lens and changes the focal length by altering the curvature of the liquid.

[0219] In some embodiments, at least one lens of the telephoto lens 1 can employ an irregular shape technique to reduce the size of the telephoto lens 1, making it more suitable for miniaturized electronic devices 100 and increasing its applicability. The cutout can be achieved through an I-CUT process. Furthermore, because the lens height is reduced through the cutout, the lens can have a larger aperture, thereby increasing the light transmission of the telephoto lens 1 and resulting in better image quality. Alternatively, irregular shapes can be used on the lens's structural support components, such as the lens barrel and spacers, to further reduce the size of the telephoto lens 1.

[0220] In some embodiments, the peripheral surface or supporting surface of at least one lens of the telephoto lens 1 may be blackened or roughened to eliminate stray light and improve image quality. Blackening may involve coating or plating with a matte material such as black ink, or applying a film. Roughening primarily increases surface roughness. Of course, in other embodiments, the telephoto lens 1 may also eliminate stray light in other ways; this application does not strictly limit this approach.

[0221] Exemplary examples are provided in this application for eight possible embodiments of the camera module 10.

[0222] In the first to fourth embodiments, the telephoto lens 1 includes seven lenses. The larger the number of lenses, the higher the specifications and the higher the imaging quality of the telephoto lens 1.

[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, which is closest to the object side among the three lenses of the first lens group G1, is the main lens. The second lens L2 and the third lens L3 of the three lenses of the first lens group G1 are used to adjust 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, which simplifies the optical path, reduces the design difficulty of each lens, and allows for greater thickness of the lens being adjusted, which is beneficial for manufacturing. In addition, the thickness TI of the first lens group G1 is small, and the height of the telephoto lens 1 is small, making it easy to store.

[0224] In the first and third embodiments, focusing is achieved by moving the first lens group G1 and fixing the second lens group G2. This ensures that when focusing on a close-up scene, the object-side surface of the telephoto lens 1 is closer to the subject, resulting in less light refraction, reduced aberrations, and improved image quality. In the second and fourth embodiments, focusing is achieved 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 description, in conjunction with the accompanying drawings and tables, illustrates the specific structure of the camera module 10 in various possible embodiments.

[0228] Please refer to the following: Figure 4A and Figure 4B , Figure 4A This is a schematic diagram of the optical path when the camera module 10 focuses on a distant scene in the first embodiment provided in this application. Figure 4B yes Figure 4A The diagram shows the optical path of the camera module 10 when focusing on a close-up at 50mm. Figure 4A The camera module 10 shown includes Figure 3B The following describes most of the technical features of the camera module 10 shown. The main difference between the two is described below, and the most common parts of the two will not be repeated.

[0229] In the first embodiment, the telephoto lens 1 includes seven lenses. In addition, the first lens group G1 includes three lenses, and 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 optical power, and the second lens group G2 has negative optical power. During the focusing process of the telephoto lens 1 switching between distant and near views, 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. 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 optical axis O, light rays pass sequentially 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, then through the filter 3, and finally reach the photosensitive element 2.

[0232] In the first embodiment, the telephoto lens 1 includes seven lenses. The larger number of lenses results in higher specifications and better image quality for the telephoto lens 1. Furthermore, the first lens L1, the one closest to the object side among the three lenses in the first lens group G1, is the main lens. The second lens L2 and the third lens L3 in the first lens group G1 are used to adjust parameters such as the focal length of the first lens L1, so that the first lens group G1 achieves the preset optical performance. In this embodiment, the first lens group G1 adjusts the main lens through two lenses, resulting in a simple optical path, lower design difficulty for each lens, and a relatively large thickness for the adjusted lens, which is beneficial for manufacturing. In addition, the thickness TI of the first lens group G1 is relatively small, and the height of the telephoto lens 1 is relatively small, making it easy to store.

[0233] like Figure 4A As shown, when the telephoto lens 1 focuses on a distant scene, the light reflected from the distant object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture a distant image. Figure 4B As shown, when the telephoto lens 1 focuses on a close-up object, the first lens group G1 moves along the optical axis O towards the object side. The light reflected by the close-up object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture close-up images.

[0234] like Figure 4A and Figure 4B As shown, during the focusing process of the telephoto lens 1 from a distant scene to a close-up scene, the first lens group G1 moves towards the object side along the optical axis O, while the second lens group G2 remains stationary. 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. Furthermore, the distance between the first lens group G1 and the image sensor 2 increases, while the distance between the second lens group G2 and the image sensor 2 remains unchanged. In this application, when the telephoto lens 1 focuses on a distant scene or a close-up scene, the imaging surface falls on the image sensor 2; that is, the distance between the first lens group G1 and the imaging surface of the telephoto lens 1 increases, while the distance between the second lens group G2 and the imaging surface 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-up, the object side of the telephoto lens 1 is closer to the subject, the degree of light refraction is small, aberration is reduced, and image quality is improved.

[0236] The following presents the results, combining data and simulation findings. Figure 4A The telephoto lens 1 shown is a specific embodiment of one possible solution.

[0237] Please refer to Tables 1a to 1b, where Table 1a is... Figure 4A The telephoto lens 1 shown, in one possible embodiment, displays the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 when focusing on a distant scene. The thickness includes both the thickness of the lens itself and the distance between the lenses. A virtual surface, an imaginary surface located between the filter 3 and the photosensitive element 2, is used to examine whether the light spot converges. Table 1b shows... Figure 4A The aspherical coefficients of each lens in one possible embodiment of the telephoto lens 1 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 using, but is not limited to, the following aspherical curve equations:

[0244]

[0245] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i For the i-th order aspherical coefficients, refer to Table 1b.

[0246] Please refer to Tables 1c and 1d. Tables 1c and 1d are... Figure 4A The telephoto lens 1 shown has basic parameters in one possible embodiment. In Table 1c, f1 to f7 are the focal lengths of the first lens L1 to the seventh lens L7, respectively. In Table 1d, F1 and F2 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 numerical values 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 it switches to focus on an object at 50 mm in the close shot, 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.

[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 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 (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 smaller, and the light-gathering ability is stronger, 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 smaller, and the light-gathering ability is stronger, which is convenient for focusing and shortens the motor stroke.

[0256] In addition, (F1 - F2) / F1 is approximately equal to 3, then 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-shot 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.

[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 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.

[0260] In addition, -1 < T2 / F2 < -0.1, which is beneficial to making the second lens group G2 have a small thickness, thus 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.

[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 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.

[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 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 shown in

[0263] Among them, Figure 4C and Figure 4DAll include axial chromatic aberration curves, astigmatism curves, and distortion diagrams for telephoto lens 1. The axial chromatic aberration curves include spherical aberration curves corresponding to different wavelengths of the system (illustrated as 650nm, 610nm, 555nm, 510nm, and 470nm); its physical meaning is the deviation of light of the corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system; its horizontal axis represents the deviation value along the optical axis, and its vertical axis represents the normalized coordinates at the pupil. Figure 4C and Figure 4D The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of telephoto lens 1 are well corrected when focusing on both distant and close-up scenes. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. X represents the sagittal beam, and Y represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 4C and Figure 4D The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 4C and Figure 4D The distortion shown is small, which ensures that there is no obvious deformation in the image.

[0264] Please refer to the following: Figure 5A and Figure 5B , Figure 5A This is a schematic diagram of the optical path when the camera module 10 focuses on a distant scene in the second embodiment provided in this application. Figure 5B yes Figure 5A The diagram shows the optical path of the camera module 10 when focusing on a close-up at 50mm. Figure 5A The camera module 10 shown includes Figure 3B The following describes most of the technical features of the camera module 10 shown. The main difference between the two is described below, and the most common parts of the two will not be repeated.

[0265] In the second embodiment, the telephoto lens 1 includes seven lenses, and the first lens group G1 also includes three lenses. Unlike the first embodiment, focusing is achieved 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 optical power, and the second lens group G2 has negative optical power. During the focusing process of the telephoto lens 1 switching between distant and near views, 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. 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 optical axis O, light rays pass sequentially 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, then through the filter 3, and finally reach the photosensitive element 2.

[0268] In the second embodiment, the telephoto lens 1 includes seven lenses. The larger number of lenses results in higher specifications and better image quality for the telephoto lens 1. Furthermore, the first lens L1, the one closest to the object side among the three lenses in the first lens group G1, is the main lens. The second lens L2 and the third lens L3 in the first lens group G1 are used to adjust parameters such as the focal length of the first lens L1, so that the first lens group G1 achieves the preset optical performance. In this embodiment, the first lens group G1 adjusts the main lens through two lenses, resulting in a simple optical path, low design difficulty for each lens, and a smaller thickness TI for the first lens group G1, leading to a smaller height for the telephoto lens 1 and easier storage.

[0269] like Figure 5A As shown, when the telephoto lens 1 focuses on a distant scene, the light reflected from the distant object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture a distant image. Figure 5B As shown, when the telephoto lens 1 focuses on a close-up scene, the second lens group G2 moves along the optical axis O towards the image side. The light reflected by the close-up object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture close-up images.

[0270] like Figure 5A and Figure 5B As shown, during the focusing process of the telephoto lens 1 from a distant scene to a close-up, the first lens group G1 remains stationary, while the second lens group G2 moves along the optical axis O towards the image side. 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. Furthermore, the distance between the first lens group G1 and the image sensor 2 remains unchanged, while the distance between the second lens group G2 and the image sensor 2 decreases. In this application, when the telephoto lens 1 focuses on a distant or close-up scene, the imaging surface falls on the image sensor 2; that is, the distance between the first lens group G1 and the imaging surface of the telephoto lens 1 remains unchanged, while the distance between the second lens group G2 and the imaging surface of the telephoto lens 1 decreases.

[0271] The following presents the results, combining data and simulation findings. Figure 5A The telephoto lens 1 shown is a specific embodiment of one possible solution.

[0272] Please refer to both Table 2a and Table 2b, where Table 2a is... Figure 5A The telephoto lens 1 shown in one possible embodiment has the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 when focusing on a distant scene. The thickness includes the thickness of the lens itself and the distance between the lenses. A virtual surface is an imaginary surface located between the filter 3 and the photosensitive element 2, used to examine whether the light spot converges. Table 2b shows... Figure 5A The aspherical coefficients of each lens in one possible embodiment of the telephoto lens 1 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 using, but is not limited to, the following aspherical curve equations:

[0279]

[0280] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i For the i-th order aspherical coefficients, refer to Table 2b.

[0281] Please refer to Tables 2c and 2d. Tables 2c and 2d are... Figure 5A The telephoto lens 1 shown has basic parameters in one possible embodiment. In Table 2c, f1 to f7 are the focal lengths of the first lens L1 to the seventh lens L7, respectively. In Table 2d, F1 and F2 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 numerical values 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-distance view to a close-up view, for example, when it switches to focus on an object 50 mm away in the 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 2.3 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-distance view, the effective focal length EFL of the telephoto lens 1 is 14.75 mm; when the telephoto lens 1 focuses on a close-up view, 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-distance view to a close-up view, the effective focal length EFL of the telephoto lens 1 decreases.

[0288] 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 2.3 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 relatively small, and the light-gathering ability is strong, which is beneficial for taking close-up photos within 10 cm.

[0290] 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 travel.

[0291] In addition, (F1 - F2) / F1 < 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 for achieving close-up imaging; and 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 the imaging quality.

[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, 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.

[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 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.

[0295] 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, 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 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.

[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 shown in Figure 5D is Figure 5B the simulation effect diagram of the telephoto lens 1 when focusing on a close view of 50 mm shown in

[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 ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of telephoto lens 1 are well corrected when focusing on both distant and close-up scenes. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. X represents the sagittal beam, and Y represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 5C and Figure 5D The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 5C and Figure 5D The distortion shown is small, which ensures that there is no obvious deformation in the image.

[0299] Please refer to the following: Figure 6A and Figure 6B , Figure 6A This is a schematic diagram of the optical path of the camera module 10 when focusing on a distant scene in the third embodiment provided in this application. Figure 6B yes Figure 6A The diagram shows the optical path of the camera module 10 when focusing on a close-up at 50mm. Figure 6A The camera module 10 shown includes Figure 3B The following describes most of the technical features of the camera module 10 shown. The main difference between the two is described below, and the most common parts of the two will not be repeated.

[0300] In the third embodiment, the telephoto lens 1 includes seven lenses, and focusing is achieved by moving the first lens group G1 and fixing the second lens group G2. Furthermore, unlike 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 optical power, and the second lens group G2 has negative optical power. During the focusing process of the telephoto lens 1 switching between distant and near views, 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. 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 optical axis O, light rays pass sequentially 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, then through the filter 3, and finally reach the photosensitive element 2.

[0303] like Figure 6A As shown, when the telephoto lens 1 focuses on a distant scene, the light reflected from the distant object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture a distant image. Figure 6B As shown, when the telephoto lens 1 focuses on a close-up object, the first lens group G1 moves along the optical axis O towards the object side. The light reflected by the close-up object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture close-up images.

[0304] like Figure 6A and Figure 6B As shown, during the focusing process of the telephoto lens 1 from a distant scene to a close-up scene, the first lens group G1 moves towards the object side along the optical axis O, while the second lens group G2 remains stationary. 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. Furthermore, the distance between the first lens group G1 and the image sensor 2 increases, while the distance between the second lens group G2 and the image sensor 2 remains unchanged. In this application, when the telephoto lens 1 focuses on a distant scene or a close-up scene, the imaging surface falls on the image sensor 2; that is, the distance between the first lens group G1 and the imaging surface of the telephoto lens 1 increases, while the distance between the second lens group G2 and the imaging surface of the telephoto lens 1 remains unchanged.

[0305] The following presents the results, combining data and simulation findings. Figure 6A The telephoto lens 1 shown is a specific embodiment of one possible solution.

[0306] Please refer to Tables 3a to 3b, where Table 3a is... Figure 6A The telephoto lens 1 shown in one possible embodiment has the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 when focusing on a distant scene. The thickness includes the thickness of the lens itself and the distance between the lenses. A virtual surface is an imaginary surface located between the filter 3 and the photosensitive element 2, used to examine whether the light spot converges. Table 3b is... Figure 6A The aspherical coefficients of each lens in one possible embodiment of the telephoto lens 1 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 using, but is not limited to, the following aspherical curve equations:

[0314]

[0315] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i For the i-th order aspherical coefficients, refer to Table 3b.

[0316] Please refer to Tables 3c and 3d. Tables 3c and 3d are... Figure 6A The telephoto lens 1 shown has basic parameters in one possible embodiment. In Table 3c, f1 to f7 are the focal lengths of the first lens L1 to the seventh lens L7, respectively. In Table 3d, F1 and F2 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 numerical values 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 close view, for example, when it switches to focus at a close view of 50 mm, the first lens group G1 moves towards 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 distance of the first lens group G1 moving towards the object side is 2 mm. Compared with conventional lenses (which usually need to be greater than 4 mm), the focusing distance is significantly shortened, and the focusing ability is strong.

[0322] Furthermore, when the telephoto lens 1 is focused on a distant scene, its effective focal length (EFL) is 14.55mm; when the telephoto lens 1 is focused on a close-up scene, its effective focal length (EFL) is 12.2mm. The effective focal length (EFL) of the telephoto lens 1 decreases during the focusing process from a distant scene to a close-up scene.

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

[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 shortening 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] Furthermore, T1+T2=8.72, 0.6EFL=0.6x14.55=8.73, so 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, which makes the overall height of the camera module 10 smaller when the telephoto lens 1 is in the storage state, and it occupies less space in the internal cavity of the electronic device 100, making it easier to store and better suited for thin electronic devices.

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

[0333] in, Figure 6C and Figure 6D All include axial chromatic aberration curves, astigmatism curves, and distortion diagrams for telephoto lens 1. The axial chromatic aberration curves include spherical aberration curves corresponding to different wavelengths of the system (illustrated as 650nm, 610nm, 555nm, 510nm, and 470nm); its physical meaning is the deviation of light of the corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system; its horizontal axis represents the deviation value along the optical axis, and its vertical axis represents the normalized coordinates at the pupil. Figure 6C and Figure 6D The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of telephoto lens 1 are well corrected when focusing on both distant and close-up scenes. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. X represents the sagittal beam, and Y represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 6C and Figure 6D The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 6C and Figure 6D The distortion shown is small, which ensures that there is no obvious deformation in the image.

[0334] Please refer to the following: Figure 7A and Figure 7B , Figure 7A This is a schematic diagram of the optical path of the camera module 10 when focusing on a distant scene in the fourth embodiment provided in this application. Figure 7B yes Figure 7A The diagram shows the optical path of the camera module 10 when focusing on a close-up at 50mm. Figure 7AThe camera module 10 shown includes Figure 3B The following describes most of the technical features of the camera module 10 shown. The main difference between the two is described below, and the most common parts of the two will not be repeated.

[0335] In the fourth embodiment, the telephoto lens 1 includes seven lenses. Furthermore, unlike the first embodiment, the first lens group G1 includes four lenses, and focusing is achieved 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 optical power, and the second lens group G2 has negative optical power. During the focusing process of the telephoto lens 1 switching between distant and near views, 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. 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 optical axis O, light rays pass sequentially 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, then through the filter 3, and finally reach the photosensitive element 2.

[0338] like Figure 7A As shown, when the telephoto lens 1 focuses on a distant scene, the light reflected from the distant object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture a distant image. Figure 7B As shown, when the telephoto lens 1 focuses on a close-up scene, the second lens group G2 moves along the optical axis O towards the image side. The light reflected by the close-up object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture close-up images.

[0339] like Figure 7A and Figure 7BAs shown, during the focusing process of the telephoto lens 1 from a distant scene to a close-up, the first lens group G1 remains stationary, while the second lens group G2 moves along the optical axis O towards the image side. 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. Furthermore, the distance between the first lens group G1 and the image sensor 2 remains unchanged, while the distance between the second lens group G2 and the image sensor 2 decreases. In this application, when the telephoto lens 1 focuses on a distant or close-up scene, the imaging surface falls on the image sensor 2; that is, the distance between the first lens group G1 and the imaging surface of the telephoto lens 1 remains unchanged, while the distance between the second lens group G2 and the imaging surface of the telephoto lens 1 decreases.

[0340] The following presents the results, combining data and simulation findings. Figure 7A The telephoto lens 1 shown is a specific embodiment of one possible solution.

[0341] Please refer to both Table 4a and Table 4b, where Table 4a is... Figure 7A The telephoto lens 1 shown in one possible embodiment has the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 when focusing on a distant scene. The thickness includes both the thickness of the lens itself and the distance between the lenses. A virtual surface is an imaginary surface located between the filter 3 and the photosensitive element 2, used to examine whether the light spot converges. Table 4b is... Figure 7A The aspherical coefficients of each lens in one possible embodiment of the telephoto lens 1 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 using, but is not limited to, the following aspherical curve equations:

[0348]

[0349] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i For the i-th order aspherical coefficients, refer to Table 4b.

[0350] Please refer to Tables 4c and 4d. Tables 4c and 4d are... Figure 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 numerical values 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-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 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 travel 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 travel is significantly shortened, and the focusing ability is strong.

[0357] In addition, when the telephoto lens 1 focuses on a long-distance view, the effective focal length EFL of the telephoto lens 1 is 14.55 mm; when the telephoto lens 1 focuses on a close-up view, 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-distance view to a close-up view, the effective focal length EFL of the telephoto lens 1 decreases.

[0358] 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 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), 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-up shooting within 10 cm.

[0360] 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 travel.

[0361] In addition, if (F1 - F2) / F1 is approximately equal to 3, the focal lengths of the two lens groups differ little, which can improve the light converging ability of the telephoto lens 1 and is conducive to achieving near-field 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 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 little 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 little 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 imaging quality.

[0365] In addition, if -1 < T2 / F2 < -0.1, it is conducive to making the second lens group G2 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 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, 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 overall cavity of the electronic device 100, facilitating storage and being better applicable to thin electronic devices.

[0367] Please refer to Figure 7C and Figure 7D , Figure 7C which is Figure 7A the simulation effect diagram of the telephoto lens 1 focusing on the long distance shown in Figure 7D and Figure 7B the simulation effect diagram of the telephoto lens 1 focusing on the near distance of 50 mm shown in

[0368] in, Figure 7C and Figure 7D All include axial chromatic aberration curves, astigmatism curves, and distortion diagrams for telephoto lens 1. The axial chromatic aberration curves include spherical aberration curves corresponding to different wavelengths of the system (illustrated as 650nm, 610nm, 555nm, 510nm, and 470nm); its physical meaning is the deviation of light of the corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system; its horizontal axis represents the deviation value along the optical axis, and its vertical axis represents the normalized coordinates at the pupil. Figure 7C and Figure 7D The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of telephoto lens 1 are well corrected when focusing on both distant and close-up scenes. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. X represents the sagittal beam, and Y represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 7C and Figure 7D The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 7C and Figure 7D The distortion shown is small, which ensures that there is no obvious deformation in the image.

[0369] Please refer to the following: Figure 8A and Figure 8B , Figure 8A This is a schematic diagram of the optical path of the camera module 10 when focusing on a distant scene in the fifth embodiment provided in this application. Figure 8B yes Figure 8A The diagram shows the optical path of the camera module 10 when focusing on a close-up at 50mm. Figure 8A The camera module 10 shown includes Figure 3B The following describes most of the technical features of the camera module 10 shown. The main difference between the two is described below, and the most common parts of the two will not be repeated.

[0370] In the fifth embodiment, unlike the first embodiment, the telephoto lens 1 includes six lenses. In addition, the first lens group G1 includes three lenses, and 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 optical power, and the second lens group G2 has negative optical power. During the focusing process of the telephoto lens 1 switching between distant and near views, 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 optical axis O, light rays pass sequentially 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, then through the filter 3, and finally reach the photosensitive element 2.

[0373] like Figure 8A As shown, when the telephoto lens 1 focuses on a distant scene, the light reflected from the distant object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture a distant image. Figure 8B As shown, when the telephoto lens 1 focuses on a close-up object, the first lens group G1 moves along the optical axis O towards the object side. The light reflected by the close-up object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture close-up images.

[0374] like Figure 8A and Figure 8B As shown, during the focusing process of the telephoto lens 1 from a distant scene to a close-up scene, the first lens group G1 moves towards the object side along the optical axis O, while the second lens group G2 remains stationary. 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. Furthermore, the distance between the first lens group G1 and the image sensor 2 increases, while the distance between the second lens group G2 and the image sensor 2 remains unchanged. In this application, when the telephoto lens 1 focuses on a distant scene or a close-up scene, the imaging surface falls on the image sensor 2; that is, the distance between the first lens group G1 and the imaging surface of the telephoto lens 1 increases, while the distance between the second lens group G2 and the imaging surface of the telephoto lens 1 remains unchanged.

[0375] The following presents the results, combining data and simulation findings. Figure 8A The telephoto lens 1 shown is a specific embodiment of one possible solution.

[0376] Please refer to Tables 5a and 5b together, among which Table 5a is... Figure 8AThe telephoto lens 1 shown in one possible embodiment has the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 when focusing on a distant scene. The thickness includes both the thickness of the lens itself and the distance between the lenses. A virtual surface is an imaginary surface located between the filter 3 and the photosensitive element 2, used to examine whether the light spot converges. Table 5b shows... Figure 8A The aspherical coefficients of each lens in one possible embodiment of the telephoto lens 1 shown.

[0377] Table 5a

[0378]

[0379] Table 5b

[0380]

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

[0382]

[0383] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i For the i-th order aspherical coefficients, refer to Table 5b.

[0384] Please refer to Tables 5c and 5d. Tables 5c and 5d are... Figure 8A The telephoto lens 1 shown has basic parameters in one possible embodiment. In Table 5c, f1 to f6 are the focal lengths of the first lens L1 to the sixth lens L6, respectively. In Table 5d, F1 and F2 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 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.

[0391] 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 12.4 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.

[0392] 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, 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 strong, which is beneficial to achieving a close shot 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 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 between 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-shot imaging; and the focal length F2 of the second lens group G2 is relatively large, so as to reduce the degree of light deflection of the telephoto lens 1, reduce aberration, and improve the imaging quality.

[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 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, 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.

[0399] In addition, -1 < T2 / F2 < -0.1, which is beneficial to making the second lens group G2 have a small thickness, thus 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.

[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, 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.

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

[0402] Among them, Figure 8C and Figure 8D both include the axial chromatic aberration curve diagram, the astigmatism field curvature diagram and the distortion diagram of the telephoto lens 1. Among them, the axial chromatic aberration curve diagram includes the 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. Figure 8C and Figure 8DThe values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of telephoto lens 1 are well corrected when focusing on both distant and close-up scenes. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. X represents the sagittal beam, and Y represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 8C and Figure 8D The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 8C and Figure 8D The distortion shown is small, which ensures that there is no obvious deformation in the image.

[0403] Please refer to the following: Figure 9A and Figure 9B , Figure 9A This is a schematic diagram of the optical path of the camera module 10 when focusing on a distant scene in the sixth embodiment provided in this application. Figure 9B yes Figure 9A The diagram shows the optical path of the camera module 10 when focusing on a close-up at 50mm. Figure 9A The camera module 10 shown includes Figure 3B The following describes most of the technical features of the camera module 10 shown. The main difference between the two is described below, and the most common parts of the two will not be repeated.

[0404] In the sixth embodiment, unlike the first embodiment, the telephoto lens 1 includes six lenses. In addition, the first lens group G1 includes three lenses, and 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 optical power, and the second lens group G2 has negative optical power. During the focusing process of the telephoto lens 1 switching between distant and near views, 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 optical axis O, light rays pass sequentially 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, then through the filter 3, and finally reach the photosensitive element 2.

[0407] In the sixth embodiment, the telephoto lens 1 includes six lenses. Furthermore, the first lens L1, the one closest to the object side among the three lenses in the first lens group G1, is the main lens. The second lens L2 and the third lens L3 in the first lens group G1 are used to adjust parameters such as the focal length of the first lens L1, so that the first lens group G1 obtains a preset optical performance. In this embodiment, the first lens group G1 adjusts the main lens through two lenses, resulting in a simple optical path, low design difficulty for each lens, and a small thickness TI for the first lens group G1, leading to a smaller height for the telephoto lens 1 and easier storage.

[0408] like Figure 9A As shown, when the telephoto lens 1 focuses on a distant scene, the light reflected from the distant object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture a distant image. Figure 9B As shown, when the telephoto lens 1 focuses on a close-up scene, the second lens group G2 moves along the optical axis O towards the image side. The light reflected by the close-up object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture close-up images.

[0409] like Figure 9A and Figure 9B As shown, during the focusing process of the telephoto lens 1 from a distant scene to a close-up, the first lens group G1 remains stationary, while the second lens group G2 moves along the optical axis O towards the image side. 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. Furthermore, the distance between the first lens group G1 and the image sensor 2 remains unchanged, while the distance between the second lens group G2 and the image sensor 2 decreases. In this application, when the telephoto lens 1 focuses on a distant or close-up scene, the imaging surface falls on the image sensor 2; that is, the distance between the first lens group G1 and the imaging surface of the telephoto lens 1 remains unchanged, while the distance between the second lens group G2 and the imaging surface of the telephoto lens 1 decreases.

[0410] The following presents the results, combining data and simulation findings. Figure 9A The telephoto lens 1 shown is a specific embodiment of one possible solution.

[0411] Please refer to Tables 6a to 6b, where Table 6a is... Figure 9A The telephoto lens 1 shown in one possible embodiment has the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 when focusing on a distant scene. The thickness includes the thickness of the lens itself and the distance between the lenses. A virtual surface is an imaginary surface located between the filter 3 and the photosensitive element 2, used to examine whether the light spot converges. Table 6b is... Figure 9A The aspherical coefficients of each lens in one possible embodiment of the telephoto lens 1 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 using, but is not limited to, the following aspherical curve equations:

[0418]

[0419] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i For the i-th order aspherical coefficients, refer to Table 6b.

[0420] Please refer to Tables 6c and 6d. Tables 6c and 6d are... Figure 9A The telephoto lens 1 shown has basic parameters in one possible embodiment. In Table 6c, f1 to f6 are the focal lengths of the first lens L1 to the sixth lens L6, respectively. In Table 6d, F1 and F2 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 close view, for example, when it switches to focus at a close view of 50 mm, the second lens group G2 moves towards 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 distance of the second lens group G2 moving towards the image side is 2.3 mm. Compared with conventional lenses (which usually need to be greater than 4 mm), the focusing distance is significantly shortened, and the focusing ability is strong.

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

[0428] In this embodiment, when the telephoto lens 1 switches from a distant scene to a near scene, 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 for taking a near-scene photo 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 for achieving near-scene 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.

[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, 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.

[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, 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.

[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; and it is 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, 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.

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

[0438] Among them, Figure 9C and Figure 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, the deviation relative to 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 9C and Figure 9D The indicated values in Figure 9C and Figure 9D are both small. When focusing on a distant view and a close view, the on-axis aberrations (such as spherical aberration, chromatic aberration, etc.) of the telephoto lens 1 are corrected well. The astigmatism field curvature diagram is used to indicate the deviation of the convergence point of the thin beam of 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 the value of a certain field of view is too large, the image quality of that field of view is poor or there are high-order aberrations. Figure 9C and Figure 9DThe distortion shown is small, which ensures that there is no obvious deformation in the image.

[0439] Please refer to the following: Figure 10A and Figure 10B , Figure 10A This is a schematic diagram of the optical path of the camera module 10 when focusing on a distant scene in the seventh embodiment provided in this application. Figure 10B yes Figure 10A The diagram shows the optical path of the camera module 10 when focusing on a close-up at 50mm. Figure 10A The camera module 10 shown includes Figure 3B The following describes most of the technical features of the camera module 10 shown. The main difference between the two is described below, and the most common parts of the two will not be repeated.

[0440] In the seventh embodiment, the telephoto lens 1 includes five lenses. In addition, the first lens group G1 includes three lenses, and 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 optical power, and the second lens group G2 has negative optical power. During the focusing process of the telephoto lens 1 switching between distant and near views, 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 optical axis O, light rays pass sequentially through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, then through the filter 3, and finally reach the photosensitive element 2.

[0443] like Figure 10A As shown, when the telephoto lens 1 focuses on a distant scene, the light reflected from the distant object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture a distant image. Figure 10B As shown, when the telephoto lens 1 focuses on a close-up object, the first lens group G1 moves along the optical axis O towards the object side. The light reflected by the close-up object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture close-up images.

[0444] like Figure 10A and Figure 10BAs shown, during the focusing process of the telephoto lens 1 from a distant scene to a close-up scene, the first lens group G1 moves towards the object side along the optical axis O, while the second lens group G2 remains stationary. 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. Furthermore, the distance between the first lens group G1 and the image sensor 2 increases, while the distance between the second lens group G2 and the image sensor 2 remains unchanged. In this application, when the telephoto lens 1 focuses on a distant scene or a close-up scene, the imaging surface falls on the image sensor 2; that is, the distance between the first lens group G1 and the imaging surface of the telephoto lens 1 increases, while the distance between the second lens group G2 and the imaging surface of the telephoto lens 1 remains unchanged.

[0445] The following presents the results, combining data and simulation findings. Figure 10A The telephoto lens 1 shown is a specific embodiment of one possible solution.

[0446] Please refer to Tables 7a to 7b, where Table 7a is... Figure 10A The telephoto lens 1 shown in one possible embodiment has the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 when focusing on a distant scene. The thickness includes both the thickness of the lens itself and the distance between the lenses. A virtual surface is an imaginary surface located between the filter 3 and the photosensitive element 2, used to examine whether the light spot converges. Table 7b is... Figure 10A The aspherical coefficients of each lens in one possible embodiment of the telephoto lens 1 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 using, but is not limited to, the following aspherical curve equations:

[0453]

[0454] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i For the i-th order aspherical coefficients, see Table 7b.

[0455] Please refer to Tables 7c and 7d. Tables 7c and 7d are... Figure 10AThe basic parameters of the telephoto lens 1 shown in a possible embodiment. f1 to f5 in Table 7c are the focal lengths of the first lens L1 to the fifth lens L5 respectively, and F1 and F2 in Table 7d 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.

[0456] Table 7c

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

[0458] Table 7d

[0459]

[0460]

[0461] 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 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 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 12.1 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.

[0463] In this embodiment, when the telephoto lens 1 switches from a long shot to a close shot, 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, 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 telephoto lens 1 increases.

[0464] In this embodiment, as shown in Table 7d, F1 < 0.9EFL (0.9EFL = 0.9 x 14.6 = 13.14), 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 close-shot photography within 10 cm.

[0465] 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 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 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, 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, facilitate storage, and facilitate the movement of the first lens group G1 to improve imaging quality.

[0470] 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, facilitating storage, and facilitating the movement of the second lens group G2 to improve 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 occupying a small space in the whole machine cavity of the electronic device 100, facilitating storage and being better applicable to thin electronic devices.

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

[0473] in, Figure 10C and Figure 10D All include axial chromatic aberration curves, astigmatism curves, and distortion diagrams for telephoto lens 1. The axial chromatic aberration curves include spherical aberration curves corresponding to different wavelengths of the system (illustrated as 650nm, 610nm, 555nm, 510nm, and 470nm); its physical meaning is the deviation of light of the corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical system; its horizontal axis represents the deviation value along the optical axis, and its vertical axis represents the normalized coordinates at the pupil. Figure 10C and Figure 10D The values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of telephoto lens 1 are well corrected when focusing on both distant and close-up scenes. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. X represents the sagittal beam, and Y represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 10C and Figure 10D The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 10C and Figure 10D The distortion shown is small, which ensures that there is no obvious deformation in the image.

[0474] Please refer to the following: Figure 11A and Figure 11B , Figure 11A This is a schematic diagram of the optical path of the camera module 10 when focusing on a distant scene in the eighth embodiment provided in this application. Figure 11B yes Figure 11A The diagram shows the optical path of the camera module 10 when focusing on a close-up at 50mm. Figure 11A The camera module 10 shown includes Figure 3B The following describes most of the technical features of the camera module 10 shown. The main difference between the two is described below, and the most common parts of the two will not be repeated.

[0475] In the eighth embodiment, the telephoto lens 1 includes five lenses. In addition, the first lens group G1 includes three lenses, and 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 optical power, and the second lens group G2 has negative optical power. During the focusing process of the telephoto lens 1 switching between distant and near views, 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 optical axis O, light rays pass sequentially through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, then through the filter 3, and finally reach the photosensitive element 2.

[0478] like Figure 11A As shown, when the telephoto lens 1 focuses on a distant scene, the light reflected from the distant object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture a distant image. Figure 11B As shown, when the telephoto lens 1 focuses on a close-up scene, the second lens group G2 moves along the optical axis O towards the image side. The light reflected by the close-up object passes through the telephoto lens 1 and forms an image on the imaging surface. The imaging surface falls on the photosensitive element 2, and the camera module 10 can capture close-up images.

[0479] like Figure 11A and Figure 11B As shown, during the focusing process of the telephoto lens 1 from a distant scene to a close-up, the first lens group G1 remains stationary, while the second lens group G2 moves along the optical axis O towards the image side. 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. Furthermore, the distance between the first lens group G1 and the image sensor 2 remains unchanged, while the distance between the second lens group G2 and the image sensor 2 decreases. In this application, when the telephoto lens 1 focuses on a distant or close-up scene, the imaging surface falls on the image sensor 2; that is, the distance between the first lens group G1 and the imaging surface of the telephoto lens 1 remains unchanged, while the distance between the second lens group G2 and the imaging surface of the telephoto lens 1 decreases.

[0480] The following presents the results, combining data and simulation findings. Figure 11A The telephoto lens 1 shown is a specific embodiment of one possible solution.

[0481] Please refer to both Table 8a and Table 8b, where Table 8a is... Figure 11AThe telephoto lens 1 shown in one possible embodiment has the radius of curvature, thickness, refractive index (Nd), and Abbe number of each lens and filter 3 when focusing on a distant scene. The thickness includes both the thickness of the lens itself and the distance between the lenses. A virtual surface is an imaginary surface located between the filter 3 and the photosensitive element 2, used to examine whether the light spot converges. Table 8b is... Figure 11A The aspherical coefficients of each lens in one possible embodiment of the telephoto lens 1 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 using, but is not limited to, the following aspherical curve equations:

[0488]

[0489] Where z is a point on the aspherical surface at a distance r from the optical axis, and its relative distance to the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; α i For the i-th order aspherical coefficients, refer to Table 8b.

[0490] Please refer to Tables 8c and 8d. Tables 8c and 8d are... Figure 11A The telephoto lens 1 shown has basic parameters in one possible embodiment. In Table 8c, f1 to f5 are the focal lengths of the first lens L1 to the fifth lens L5, respectively. In Table 8d, F1 and F2 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 numerical values 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 shot to a close shot, for example, when it switches to focus on an object at 50 mm 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 mm. That is, the focusing travel 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 travel is significantly shortened, and the focusing ability is strong.

[0496] 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 10.7 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.

[0497] 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 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 for achieving close-shot photography 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 travel.

[0500] 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 for achieving close-shot imaging; and 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 the imaging quality.

[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, 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.

[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, 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.

[0503] 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; 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 beneficial for the second lens group G2 to have a small thickness, thus 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.

[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 Figure 11C and Figure 11D , Figure 11C is Figure 11A the simulation effect diagram of the telephoto lens 1 when focusing on a distant view shown in Figure 11D is Figure 11B [[ID=2,4]]the simulation effect diagram of the telephoto lens 1 when focusing on a close view of 50 mm shown in

[0507] Among them, Figure 11C and Figure 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 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 11C and Figure 11DThe values ​​are all relatively small, indicating that the on-axis aberrations (spherical aberration, chromatic aberration, etc.) of telephoto lens 1 are well corrected when focusing on both distant and close-up scenes. The astigmatism field curve is used to illustrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. X represents the sagittal beam, and Y represents the meridional beam. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the corresponding field of view. When a value in a certain field of view is too large, the image quality of that field of view is poor or there are advanced aberrations. Figure 11C and Figure 11D The field curvature in both directions shown is small, indicating that the system has good depth of focus. The distortion diagram is used to characterize the relative deviation between the beam convergence point (actual image height) and the ideal image height in different fields of view. Figure 11C and Figure 11D The distortion shown is small, which ensures that there is no obvious deformation in the image.

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

[0509] The above description and embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. Where there is no conflict, the embodiments of this application and the features in the embodiments can be combined with each other.

Claims

1. A long focus lens characterized by, The field of view of the long-focus lens is less than 60° when the long-focus lens focuses on a far scene; The long-focus lens comprises a first lens group and a second lens group arranged from an object side to an image side, the long-focus lens has two lens groups, the first lens group only comprises three lenses, and the second lens group only comprises four lenses; or, the first lens group only comprises four lenses, and the second lens group only comprises three lenses; or, the first lens group only comprises three lenses, and the second lens group only comprises three lenses; The first lens group has positive refractive power, the second lens group has negative refractive power, the distance between the first lens group and the second lens group changes in the focusing process of the long-focus lens switching between a far scene and a near scene, and the closest focusing distance of the long-focus lens is within 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 long-focus lens satisfy 0.5EFL < T1+T2 < EFL.

2. The telephoto lens of claim 1, wherein The thickness T1 of the first lens group, the thickness T2 of the second lens group, and the effective focal length EFL of the long-focus lens satisfy 0.6EFL < T1+T2 ≤ 0.8EFL.

3. The telephoto lens of claim 1, wherein, In the focusing process of the long-focus lens switching from a far scene to a near scene, the distance between the first lens group and the second lens group increases.

4. The telephoto lens of claim 1, wherein, In the focusing process of the long-focus lens switching from a far scene to a near scene, the distance between the first lens group and the imaging surface of the long-focus lens is unchanged, and the distance between the second lens group and the imaging surface of the long-focus lens decreases. Or, the distance between the first lens group and the imaging surface of the long-focus lens increases, and the distance between the second lens group and the imaging surface of the long-focus lens is unchanged.

5. The telephoto lens according to any one of claims 1 to 4, characterized in that, The focal length F1 of the first lens group and the effective focal length EFL of the long-focus lens satisfy F1 ≤ 0.9EFL.

6. The telephoto lens according to any one of claims 1 to 4, characterized in that, The focal length F2 of the second lens group and the effective focal length EFL of the long-focus lens satisfy EFL < -F2.

7. The telephoto lens of claim 6, wherein, 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.

8. The telephoto lens of claim 1, wherein, The first lens group further comprises a second lens, the second lens of the first lens group is located 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.

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

10. The telephoto lens of claim 1, wherein, The thickness T1 of the first lens group and the focal length F1 of the first lens group satisfy 0.3 < T1 / F1 < 1; Or, a thickness T2 of the second lens group and a focal length F2 of the second lens group satisfy: -1 < T2 / F2 < -0.

1.

11. The telephoto lens of claim 1, wherein, An image height ImgH of the long-focus lens satisfies: ImgH > 2 millimeters.

12. A camera module, comprising: The camera module further comprises a second driving mechanism connected with the first lens group, the second driving mechanism being configured to control the first lens group to move along the optical axis.

13. The camera module of claim 12, wherein, The camera module further comprises a third driving mechanism connected with the second lens group, the third driving mechanism being configured to control the second lens group to move along the optical axis. The camera module further comprises a third driving mechanism connected with the second lens group, the third driving mechanism being configured to control the second lens group to move along the optical axis.

14. An electronic device, comprising: The camera module further comprises a third driving mechanism connected with the second lens group, the third driving mechanism being configured to control the second lens group to move along the optical axis.

15. An electronic device, comprising: The camera module further comprises a third driving mechanism connected with the second lens group, the third driving mechanism being configured to control the second lens group to move along the optical axis. The second lens has a field of view less than 60 degrees. The second lens comprises a first lens group and a second lens group arranged from an object side to an image side, the second lens has two lens groups, the first lens group comprises only three lenses, and the second lens group comprises only four lenses; or, the first lens group comprises only four lenses, and the second lens group comprises only three lenses; or, the first lens group comprises only three lenses, and the second lens group comprises only three lenses. The first lens group has positive refractive power, the second lens group has negative refractive power, and the distance between the first lens group and the second lens group changes in a focusing process in which the second lens switches between a telephoto state and a close-up state, and the closest focusing distance of the second lens is less than 10 centimeters. The first lens group comprises a first lens closest to the object side, and a focal length f11 of the first lens of the first lens group and a focal length F1 of the first lens group satisfy: 0.6 < f11 / F1 < 1. The second lens group comprises a first lens closest to the object side, and a focal length f21 of the first lens of the second lens group and a focal length F2 of the second lens group satisfy: 0.2 < f21 / F2 < 1. A thickness T1 of the first lens group, a thickness T2 of the second lens group, and an effective focal length EFL of the second lens satisfy: 0.5EFL < T1+T2 < EFL.

16. The electronic device of claim 15, wherein, A thickness T1 of the first lens group, a thickness T2 of the second lens group, and an effective focal length EFL of the second lens satisfy: 0.6EFL < T1+T2 ≤ 0.8EFL.

17. The electronic device of claim 15, wherein, In a focusing process in which the second lens switches from a telephoto state to a close-up state, the distance between the first lens group and the imaging surface of the second lens is constant, and the distance between the second lens group and the imaging surface of the second lens decreases. or, the distance between the first lens group and the imaging surface of the second lens increases, and the distance between the second lens group and the imaging surface of the second lens remains unchanged.

18. The electronic device of claim 15, wherein, The focal length F1 of the first lens group and the effective focal length EFL of the second lens satisfy: F1≤0.9EFL.

19. The electronic device of claim 15, wherein, The focal length F2 of the second lens group and the effective focal length EFL of the second lens satisfy: EFL<-F2.

20. The electronic device of claim 15, wherein, 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.

21. The electronic device of claim 15, wherein, The thickness T1 of the first lens group and the focal length F1 of the first lens group satisfy: 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.

22. The electronic device of any of claims 15-21, wherein, The image height ImgH of the second lens satisfies: ImgH>2mm.

Images