Telephoto lens, camera module and electronic equipment

Abstract

The embodiment of the invention provides a telephoto lens, a camera module and electronic equipment. The telephoto lens comprises a first lens group, a first reflecting element and a second lens group. The lenses in the first lens group are arranged along a first direction. The first reflection element is used for returning the light emitted by the first lens group to a second direction. The lenses in the second lens group are arranged along a second direction. The first lens group has positive focal power, and the second lens group has negative focal power. The positions of the first reflecting element and the second lens group are relatively fixed, and the first lens group can move along a first direction relative to the first reflecting element, so that the working state of the telephoto lens is switched between a compressed state and a pop-up state, and the telephoto lens realizes a focusing function in the moving process of the first lens group. The telephoto function is realized when the telephoto lens is in a compressed state, and the microspur function is realized when the telephoto lens is in a pop-up state. The telephoto lens is large in aperture, large in target surface and small in size and has a macro shooting function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of camera, in particular to a long-focus lens, a camera module and an electronic device. BACKGROUND

[0002] In recent years, with the progress of electronic technology and the rapid development of mobile communication, electronic devices such as mobile phones, tablet computers and notebook computers have become an indispensable part of people's lives, and the camera module is an essential functional module in electronic devices. Under the development trend of miniaturization and thinness of electronic devices, the camera module needs to achieve high imaging quality while saving internal installation space.

[0003] In order to meet the demand of shooting distant scenes, in addition to the main camera lens, a long-focus lens is usually arranged in the camera module. However, due to the limitation of the internal installation space of the electronic device, the accommodation space of the long-focus lens in the camera module is small, which results in that the aperture of the long-focus lens and the photosensitive area of the photosensitive element are relatively small. The small aperture of the long-focus lens will result in small light quantity, which limits the signal-to-noise ratio of shooting and affects the shooting effect of the long-focus lens, especially in the shooting scene at night. In addition, the small photosensitive area of the photosensitive element of the long-focus lens will also affect the shooting effect of the long-focus lens. In order to improve the light quantity of the long-focus lens, the lens aperture or the photosensitive area of the photosensitive element can be increased. However, this will result in a significant increase in the optical length of the long-focus lens, and further result in an increase in the size of the camera module, which is contrary to the development direction of miniaturization and thinness of electronic devices.

[0004] In addition, in addition to the demand of shooting distant scenes, the camera module also needs to meet the demand of macro shooting in many scenes.

[0005] Therefore, how to break through the size limitation of the camera module and realize a long-focus lens with large aperture, large target surface, small size and macro shooting function is a technical problem to be solved urgently. SUMMARY

[0006] The embodiments of the present application provide a long-focus lens, a camera module and an electronic device, which break through the size limitation of the camera module and realize a long-focus lens with large aperture, large target surface, small size and macro shooting function.

[0007] In a first aspect, the embodiments of the present application provide a long-focus lens. The long-focus lens can include a first lens group, a first reflecting element, and a second lens group. The first lens group includes at least one lens. The lenses in the first lens group are arranged along a first direction. The first lens group is configured to transmit light along the first direction. The first reflecting element is located on an exit side of the first lens group and is configured to fold the light exiting the first lens group to a second direction. The first direction and the second direction form a set angle. The set angle can be 90 degrees, for example. The second lens group is located on an exit side of the first reflecting element. The second lens group includes at least one lens. The lenses in the second lens group are arranged along the second direction. The second lens group is configured to transmit the light folded by the first reflecting element along the second direction. The first lens group has a positive focal power. The second lens group has a negative focal power. The lenses in the first lens group can all have a positive focal power. Alternatively, some of the lenses in the first lens group have a positive focal power, and some of the lenses have a negative focal power. As long as the lenses in the first lens group have a positive focal power as a whole, the first lens group can have a positive focal power. The lenses in the second lens group can all have a negative focal power. Alternatively, some of the lenses in the second lens group have a positive focal power, and some of the lenses have a negative focal power. As long as the lenses in the second lens group have a negative focal power as a whole, the second lens group can have a negative focal power. The focal power of the lenses in the first lens group and the second lens group can be set to make the first lens group have a positive focal power and the second lens group have a negative focal power. The entrance side of the first lens group is an object side. The exit side of the second lens group is an image side. The object side is the side on which an object is located. The image side is the side on which an image of the object is located. The focal power is equal to the difference between the convergence degree of the light beam on the image side and the convergence degree of the light beam on the object side. The positive focal power indicates that the lens has a positive focal length and has a converging effect on the light rays. The negative focal power indicates that the lens has a negative focal length and has a diverging effect on the light rays.

[0008] In actual applications, a photosensitive element can be arranged on the exit side of the second lens group. The light reflected by the object enters the entrance side of the first lens group, passes through the first lens group, the first reflecting element, and the second lens group, and then is incident on the photosensitive element. The photosensitive element can receive the image of the object and convert the sensed light signal into an electrical signal, thereby realizing the shooting function of the long-focus lens. The photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) or other elements having a photoelectric conversion function.

[0009] In the long-focus lens provided in the embodiments of the present application, the first reflecting element is arranged on the optical path between the first lens group and the second lens group, the first reflecting element can fold the light rays emitted by the first lens group to the second direction, thereby the optical path in the long-focus lens can be folded and the volume of the long-focus lens can be reduced. In this way, when the structure of the long-focus lens is arranged, the aperture in the long-focus lens and the photosensitive area of the photosensitive element can be increased, thereby the long-focus lens can have the characteristics of large aperture, large target surface and small size, and the photosensitive capability of the long-focus lens can be improved. The aperture is a component for controlling the amount of light emitted to the photosensitive element through each lens, and the target surface refers to the photosensitive surface of the photosensitive element. The larger the photosensitive area of the photosensitive element is, the larger the target surface of the long-focus lens is.

[0010] In a possible implementation, the first reflecting element can include a first right-angle prism P1, the first right-angle prism P1 can fold the optical path by 90 degrees, thereby the light rays emitted by the first lens group can be folded to the second direction. Of course, in some cases, the first reflecting element can also be a plane mirror, a Schmidt prism or other reflecting elements such as a pentagonal prism.

[0011] When the structure of the first lens group and the second lens group is arranged in detail, each lens in the first lens group and the second lens group can have an ICUT (Incidence Cut) arrangement, thereby the size of the long-focus lens can be reduced.

[0012] In the embodiments of the present application, the position of the first reflecting element is fixed relative to the second lens group. The first lens group can move relative to the first reflecting element along the first direction, so that the working state of the long-focus lens is switched between the compressed state and the popped-out state. When the long-focus lens is in the compressed state, the distance between the light entrance surface of the first lens group and the light entrance surface of the first reflecting element is a first distance, and the long-focus lens implements the telephoto function. When the long-focus lens is in the popped-out state, the distance between the light entrance surface of the first lens group and the light entrance surface of the first reflecting element is a second distance, and the long-focus lens implements the macro function. The second distance is greater than the first distance. In some embodiments of the present application, when the first lens group includes a plurality of lenses, the lenses in the first lens group move together during the switching of the long-focus lens between the compressed state and the popped-out state, and the relative positions between the lenses remain unchanged.

[0013] The object distance of the long-focus lens in the compressed state can be equivalent to infinity. The light rays reflected by the photographed object can be considered to be incident into the long-focus lens in the form of parallel light beams from the point at infinity, the long-focus lens is focused at infinity, and the scene at infinity can be clearly imaged, thereby the telephoto function is implemented. The focal length of the long-focus lens in the popped-out state is smaller than that in the compressed state, and the long-focus lens has a magnification of one or more in the popped-out state, and can shoot an image that is equal to or smaller than the actual object, thereby the macro function is implemented.

[0014] In the embodiments of the present application, the compressed state and the popped-out state of the long-focus lens are both working states, the first mirror group can move relative to the first reflecting element in the first direction, so that the long-focus lens can be switched between the compressed state and the popped-out state. In this way, the long-focus lens can meet the demand of shooting distant scenes and also realize the macro function with high magnification and high resolution, so as to meet the demand of shooting close scenes. Thus, the shooting effect of the long-focus lens is improved, and the application scenarios of the long-focus lens are widened.

[0015] In the embodiments of the present application, the positions of the first reflecting element and the second mirror group are fixed when the long-focus lens is in the compressed state and the popped-out state. In this way, the long-focus lens does not need to set the optical stroke, the mechanism space and the reliability space for the movement of the optical element in the second direction, the total length of the optical path of the long-focus lens inside the electronic device is reduced, the structure of the camera module is made more compact while good imaging effect is achieved, and the size miniaturization of the camera module is facilitated.

[0016] The long-focus lens in the embodiments of the present application can be installed inside the shell of the electronic device. When the long-focus lens is in the compressed state, the distance between the first mirror group and the first reflecting element is short, and all the components in the long-focus lens are accommodated inside the shell. An optical aperture is provided outside the shell of the electronic device, and the first mirror group faces the optical aperture and receives the light reflected by the object to be shot through the optical aperture. When the long-focus lens is in the popped-out state, the first mirror group moves away from the first reflecting element in the first direction, so that the distance between the first mirror group and the first reflecting element is increased, and the first mirror group and other components such as the deco are popped out to the outside of the shell. The movement process of the first mirror group does not increase the thickness of the shell. Exemplarily, the pop-out distance of the long-focus lens in the embodiments of the present application can be between 3.5 mm and 4.5 mm, and specifically can be in the range of 3.9 mm to 4.1 mm. In this way, the focusing stroke of the long-focus lens can be transferred to the outside of the shell, the optical path length of the long-focus lens inside the shell is compressed, the volume proportion of the long-focus lens inside the shell can be reduced, and the volume space occupied by the long-focus lens in the electronic device is released. Thus, the installation volume of the long-focus lens in the electronic device can be further reduced, and the internal space of the electronic device is saved.

[0017] In addition, the first mirror group can change the focal length of the long-focus lens during the movement process in the first direction, so that the focusing function of the long-focus lens can be realized during the movement process of the first mirror group, and the auto-focusing function can be realized according to different focal length requirements during use. The long-focus lens in the embodiments of the present application has a two-group architecture, and the focusing function can be realized by moving the first mirror group. Therefore, the structure of the long-focus lens in the embodiments of the present application is relatively simple, and the long-focus lens has the characteristics of high yield and low cost.

[0018] Therefore, the embodiment of the present application can break through the size limitation of the camera module, and realize a long-focus lens with a large aperture, a large target surface, a small size, and a macro shooting function.

[0019] In a possible implementation, the long-focus lens in the embodiment of the present application can further include a second reflecting element located between the second mirror group and the optical path of the photosensitive element. The second reflecting element is configured to reflect the light emitted by the second mirror group to the photosensitive element. The second reflecting element can fold the light path in the long-focus lens back to the first direction, thereby further reducing the volume of the long-focus lens. In a possible implementation, the second reflecting element has at least one reflecting surface, and the number of reflections of the light path on the second reflecting element can be greater than or equal to 1, for example, the second reflecting element can include a second right-angle prism P2, which can fold the light path by 90 degrees, thereby folding the light emitted by the second mirror group back to the first direction. Of course, the second reflecting element can also be a plane mirror, a Schmidt prism, or a pentagonal prism, or other reflecting elements. In some cases, the long-focus lens can also not be provided with the second reflecting element, or more reflecting elements can be provided between the second mirror group and the photosensitive element, and the number and position of the reflecting elements in the long-focus lens can be reasonably set according to the mounting space of the long-focus lens in the electronic element.

[0020] In a possible implementation, the long-focus lens in the embodiment of the present application can further include a diaphragm, and the diaphragm is located on the light-incident side of the first mirror group. The diaphragm can limit the light incident into the long-focus lens to adjust the intensity of the light, thereby controlling the amount of light entering the long-focus lens.

[0021] When the structure of the long-focus lens is specifically set, the ratio of the focal length of the first mirror group to the focal length of the long-focus lens in the compressed state can satisfy the following relationship: 0.5≤|F1 / Ft|≤2; wherein F1 is the focal length of the first mirror group, and Ft is the focal length of the long-focus lens in the compressed state. In this way, the long-focus lens can meet the focal length requirement of the telephoto function, and the telephoto function of the long-focus lens can have high imaging quality. And / or, the ratio of the focal length of the second mirror group to the focal length of the long-focus lens in the compressed state can satisfy the following relationship: 0.1≤|F2 / Ft|≤1.2; wherein F2 is the focal length of the second mirror group, and Ft is the focal length of the long-focus lens in the compressed state. In this way, the long-focus lens can meet the focal length requirement of the macro function, and the magnification and resolution of the macro function of the long-focus lens can be improved.

[0022] When the long-focus lens is switched between the compressed state and the popped-out state, the ratio of the moving distance of the first lens group to the total track length (TTL) of the long-focus lens is in the range of 0.01-0.5. The TTL is the total length of the light-in side of the first lens group to the light-sensing surface of the light-sensing element on the optical axis, and the optical axis refers to the light passing through the center of each lens. In this way, the moving distance of the first lens group can meet the requirements of the macro function, realize the magnification function of different magnifications, and ensure that the long-focus lens will not protrude too much out of the shell of the electronic device due to the large pop-out distance, and ensure that the long-focus lens has good stability during switching between the compressed state and the popped-out state.

[0023] In addition, the focal length of the long-focus lens and the maximum half image height of the light-sensing element can satisfy the following relationship: IMH / EFL<0.6; wherein IMH is the maximum half image height of the light-sensing element, and EFL is the effective focal length of the long-focus lens. The effective focal length (EFL) is a way of measuring the convergence or divergence of light in an optical system, and refers to the vertical distance from the optical center of the lens or lens group to the focal plane when an infinite scene forms a clear image on the focal plane through the lens or lens group. IMH can reflect the size of the light-sensing area of the light-sensing element. The maximum half image height (IMH) is half of the full image height of the image formed by the first lens group and the second lens group, and is the maximum radius of the imaging circle. When designing the specific structure of the long-focus lens, adjusting the light-sensing area of the light-sensing element will affect parameters such as the focal length of the long-focus lens. In the embodiments of the present application, the ratio of IMH to EFL is set to be less than 0.6, so that the long-focus lens can meet the requirements of long-focus shooting and have a larger light-sensing area.

[0024] In specific implementation, the number, shape, focal power, material, and position of the lenses in the first lens group and the second lens group can be reasonably set to realize a long-focus lens with a large aperture, a large target surface, a small size, and a macro shooting function.

[0025] In some embodiments of the present application, the long-focus lens can include a first lens group, a first reflecting element, a second lens group, a second reflecting element, and a light-sensing element. The first lens group has positive focal power and can include three lenses, i.e., a first lens, a second lens, and a third lens, which are sequentially arranged from the object side to the image side. The first lens has positive focal power, the second lens has positive focal power, and the third lens has negative focal power. The second lens group has negative focal power and can include five lenses, i.e., a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which are sequentially arranged from the object side to the image side. The fourth lens has negative focal power, the fifth lens has positive focal power, the sixth lens has negative focal power, the seventh lens has positive focal power, and the eighth lens has negative focal power.

[0026] In some embodiments of the present application, the long-focus lens comprises a first mirror group, a first reflecting element, a second mirror group, a second reflecting element and a photosensitive element. The first mirror group has positive refractive power, and the first mirror group can comprise two lenses, i.e., a first lens and a second lens arranged in order from the object side to the image side. The first lens has positive refractive power, and the second lens has negative refractive power. The second mirror group has negative refractive power, and the second mirror group can comprise six lenses, i.e., a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens arranged in order from the object side to the image side. The third lens has negative refractive power, the fourth lens has positive refractive power, the fifth lens has negative refractive power, the sixth lens has positive refractive power, the seventh lens has positive refractive power, and the eighth lens has negative refractive power.

[0027] In a second aspect, the embodiments of the present application further provide a camera module. The camera module provided by the embodiments of the present application can comprise any long-focus lens in the first aspect and a control element. The control element can be used to control the long-focus lens to switch between the compressed state and the popped-out state. Since the long-focus lens in the first aspect has the characteristics of large aperture, large target surface, small size and macro shooting function, the shooting effect of the camera module comprising the long-focus lens in the first aspect is good.

[0028] In a third aspect, the embodiments of the present application further provide an electronic device. The electronic device provided by the embodiments of the present application can comprise any camera module in the second aspect and a circuit board, and the control element in the camera module is electrically connected to the circuit board. Since the camera module in the second aspect has good shooting effect, the electronic device comprising any camera module also has good shooting effect and good user experience. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A structural schematic diagram of the long-focus lens provided by the embodiments of the present application;

[0030] Figure 2 A structural schematic diagram of the long-focus lens provided by embodiment one of the present application;

[0031] Figure 3 A modulation transfer function (MTF) curve diagram of the long-focus lens in embodiment one;

[0032] Figure 4 A structural schematic diagram of the long-focus lens provided by embodiment two of the present application;

[0033] Figure 5 A modulation transfer function (MTF) curve diagram of the long-focus lens in embodiment two;

[0034] Figure 6A structural schematic diagram of a long-focus lens provided for Embodiment Three of the present application;

[0035] Figure 7 A modulation transfer function (MTF) curve diagram of the long-focus lens in Embodiment Three;

[0036] Figure 8 A structural schematic diagram of a long-focus lens provided for Embodiment Four of the present application;

[0037] Figure 9 A modulation transfer function (MTF) curve diagram of the long-focus lens in Embodiment Four;

[0038] Figure 10 A structural schematic diagram of a long-focus lens provided for Embodiment Five of the present application;

[0039] Figure 11 A modulation transfer function (MTF) curve diagram of the long-focus lens in Embodiment Five.

[0040] Reference Signs:

[0041] 101 - first lens group; 102 - first reflecting element; 103 - second lens group; 104 - second reflecting element; 105 - light receiving element; 106 - diaphragm; V1 - first direction; V2 - second direction; D1 - first distance; D2 - second distance; L1 - first lens; L2 - second lens; L3 - third lens; L4 - fourth lens; L5 - fifth lens; L6 - sixth lens; L7 - seventh lens; L8 - eighth lens; P1 - first right-angle prism; P2 - second right-angle prism. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the present application with reference to the accompanying drawings. It should be understood that the detailed description is only a description of the exemplary embodiments of the present application, and does not limit the scope of the present application in any way. The embodiments in the present application and the features in the embodiments can be combined with each other.

[0043] It should be noted that the accompanying drawings of the present application are only used for illustrating the relative positional relationship and do not represent the real proportions. In the accompanying drawings, the thickness, size and shape of the lenses have been slightly exaggerated for the convenience of illustration. Specifically, the shape of the spherical surface or aspherical surface shown in the accompanying drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the accompanying drawings. The accompanying drawings are only examples and are not drawn strictly to scale. The same reference signs in the accompanying drawings of the present application represent the same or similar structures, and thus repeated description thereof will be omitted.

[0044] The terms expressing position and direction described in the present application, for example, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, are described based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Changes can also be made as needed, and the changes made are all within the scope of protection of the present application. In addition, the terms "first", "second" are only for the purpose of description, to distinguish one feature from another feature, and do not represent any limitation on the features, nor can it be understood as indicating or implying relative importance, and the expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0045] The camera module is an essential functional module in electronic devices. In order to meet the more diverse shooting needs, a main camera lens and a telephoto lens are usually provided in the camera module. The equivalent focal length of the main camera lens is generally about 25mm, which has the characteristics of large field of view, large aperture, large target surface, etc., and is used for shooting large field of view scenes. The equivalent focal length of the telephoto lens is generally between 70mm and 250mm, and the field of view and aperture are small, which is used for shooting distant objects. In order to achieve longer focal length and better imaging quality, the size of the telephoto lens in the length direction and the lens aperture are becoming larger and larger. However, due to the limitation of the internal installation space in the electronic device, the accommodation space of the telephoto lens in the camera module is limited, which makes it difficult to improve the aperture of the telephoto lens and the photosensitive area of the photosensitive element.

[0046] In the related art, the aperture of the telephoto lens is relatively small, and the F# number is generally greater than or equal to 3.0. The small aperture will result in small light amount, and the small light amount will limit the signal-to-noise ratio of shooting, thereby affecting the shooting effect of the telephoto lens, especially the shooting effect in the night shooting scene. In addition, the photosensitive area of the photosensitive element of the telephoto lens is relatively small, generally less than 1 / 2 inch. The small photosensitive area of the photosensitive element will also affect the shooting effect of the telephoto lens. In order to improve the light amount of the telephoto lens, the lens aperture or the photosensitive area of the photosensitive element can be increased. However, this will cause the optical length of the telephoto lens to increase significantly, and further cause the size of the camera module to increase, which is contrary to the development direction of miniaturization and ultra-thin of electronic devices.

[0047] In addition, in addition to the demand for shooting distant objects, in many scenes, the camera module also needs to meet the demand for macro shooting.

[0048] Based on this, in order to break through the size limit of the camera module, realize a long-focus lens with large aperture, large target surface, small size and macro shooting function, the embodiment of the present application provides a long-focus lens, a camera module and an electronic device. The camera module in the embodiment of the present application can be applied to various shooting and recording image scenes, including various shooting and recording image scenes with different apertures. For example, it can be applied to smart phones, notebook computers, tablet computers, wearable devices, cameras, vehicle-mounted devices, monitoring camera devices and other portable electronic devices, so that the portable electronic device can realize the function of shooting external photos and videos through the camera module.

[0049] Figure 1 The structural schematic diagram of the long-focus lens provided by the embodiment of the present application is shown in FIG. 1, which can include a first mirror group 101, a first reflecting element 102 and a second mirror group 103. Figure 1 The long-focus lens provided by the embodiment of the present application can include a first mirror group 101, a first reflecting element 102 and a second mirror group 103. The first mirror group 101 includes at least one lens, for example Figure 1 The first mirror group 101 can include a first lens L1, a second lens L2 and a third lens L3, and each lens in the first mirror group 101 is arranged along a first direction V1, and the first mirror group 101 is used for transmitting light along the first direction V1. The first reflecting element 102 is located on the light exit side of the first mirror group 101, and is used for folding the light emitted by the first mirror group 101 to a second direction V2. Wherein, the first direction V1 and the second direction V2 are at a set angle, that is, the first direction V1 and the second direction V2 intersect with each other, and the set angle can be 90 degrees, of course, the set angle can also be other non-zero values, which is not limited here. The second mirror group 103 is located on the light exit side of the first reflecting element 102, and the second mirror group 103 includes at least one lens, for example Figure 1The second mirror group 103 can include a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8, and the lenses in the second mirror group 103 are arranged along a second direction V2. The second mirror group 103 is configured to transmit the light rays reflected by the first reflecting element 102 along the second direction V2. The first mirror group 101 has a positive focal power, and the second mirror group 103 has a negative focal power. In some embodiments, each lens in the first mirror group 101 can have a positive focal power, or some lenses in the first mirror group 101 have a positive focal power and some lenses have a negative focal power, as long as the first mirror group 101 as a whole has a positive focal power. Similarly, each lens in the second mirror group 103 can have a negative focal power, or some lenses in the second mirror group 103 have a positive focal power and some lenses have a negative focal power, as long as the second mirror group 103 as a whole has a negative focal power. The focal powers of the lenses in the first mirror group 101 and the second mirror group 103 can be appropriately set so that the first mirror group 101 has a positive focal power and the second mirror group 103 has a negative focal power. The object side of the first mirror group 101 is the side where the object is located, and the image side of the second mirror group 103 is the side where the image of the object is located. The focal power is equal to the difference between the convergence degree of the light beam on the image side and the convergence degree of the light beam on the object side, and represents the refractive power of the lens for the incident parallel light beam. A positive focal power means that the lens has a positive focal length and has a converging effect on the light rays. A negative focal power means that the lens has a negative focal length and has a diverging effect on the light rays.

[0050] In actual applications, a photosensitive element 105 can be arranged on the image side of the second mirror group 103. The light rays reflected by the object enter the object side of the first mirror group 101, pass through the first mirror group 101, the first reflecting element 102, and the second mirror group 103, and then reach the photosensitive element 105. The photosensitive element 105 can receive the image of the object and convert the sensed light signal into an electrical signal, thereby realizing the photographing function of the long-focus lens. The photosensitive element 105 can be a charge-coupled device (CCD) or a complementary metal-oxidesemiconductor (CMOS) or other elements having a photoelectric conversion function.

[0051] In the telephoto lens provided in this embodiment, a first reflective element 102 is provided on the optical path between the first lens group 101 and the second lens group 103. The first reflective element 102 can refract the light emitted from the first lens group 101 back to the second direction V2, thereby folding the optical path in the telephoto lens and reducing the size of the telephoto lens. In this way, when setting the structure of the telephoto lens, the aperture and the photosensitive area of ​​the photosensitive element 105 in the telephoto lens can be increased, thereby enabling the telephoto lens to have the characteristics of large aperture, large sensor surface, and small size, and improving the light sensitivity of the telephoto lens. Here, the aperture is a component used to control the amount of light that is incident on the photosensitive element 105 after passing through each lens, and the sensor surface refers to the photosensitive surface of the photosensitive element 105. The larger the photosensitive area of ​​the photosensitive element 105, the larger the sensor surface of the telephoto lens.

[0052] In one possible implementation, the first reflecting element 102 may include a first right-angle prism P1, which can refract the light path by 90 degrees, thereby reflecting the light emitted from the first mirror group 101 back to the second direction V2. Of course, in some cases, the first reflecting element 102 may also be other reflecting elements such as a plane mirror, a Schmidt prism, or a pentagonal prism.

[0053] When specifically configuring the structure of the first lens group 101 and the second lens group 103, each lens in the first lens group 101 and the second lens group 103 can have an incised angle (ICUT) setting, thereby reducing the size of the telephoto lens.

[0054] Continue to refer to Figure 1 The positions of the first reflective element 102 and the second lens group 103 are relatively fixed. The first lens group 101 can move relative to the first reflective element 102 along the first direction V1, so that the working state of the telephoto lens switches between a compressed state and a pop-up state, such as... Figure 1 (1) is a schematic diagram of the telephoto lens in a compressed state. Figure 1 (2) is a schematic diagram of the telephoto lens in its pop-up state. Figure 1 As shown in (1), when the telephoto lens is in a compressed state, the distance between the light-incident surface of the first lens group 101 and the light-incident surface of the first reflective element 102 is the first distance D1, and the telephoto lens realizes the telephoto function. Figure 1 As shown in (2), when the telephoto lens is in the pop-up state, the distance between the light-incident surface of the first lens group 101 and the light-incident surface of the first reflective element 102 is the second distance D2, and the telephoto lens realizes the macro function. The second distance D2 is greater than the first distance D1. In some embodiments of this application, when the first lens group 101 includes multiple lenses, during the switching process between the compressed state and the pop-up state of the telephoto lens, each lens in the first lens group 101 moves together, and the relative positions between the lenses remain unchanged.

[0055] The object distance of the long-focus lens in the compressed state can be equivalent to infinity. The light reflected by the photographed object can be considered to be taken into the long-focus lens in the form of a parallel light beam from an infinite point. The long-focus lens is focused at infinity, enabling the infinity scene to be clearly imaged, thereby realizing the telephoto function. The focal length of the long-focus lens in the pop-up state is smaller than that in the compressed state. In the pop-up state, the long-focus lens has a magnification of one or more, can shoot an image that is equal to or smaller than the actual object, realize high-magnification shooting at a relatively short distance, and thereby realize the macro function.

[0056] In the embodiments of the present application, the compressed state and the pop-up state of the long-focus lens are both working states. The first mirror group 101 is movable relative to the first reflecting element 102 along the first direction V1, so that the long-focus lens can be switched between the compressed state and the pop-up state. In this way, the long-focus lens can meet the demand for shooting distant scenes and also realize the macro function with high magnification and high resolution, so as to meet the demand for shooting close scenes. Thus, the shooting effect of the long-focus lens is improved, and the application scenarios of the long-focus lens are broadened.

[0057] In the embodiments of the present application, the positions of the first reflecting element 102 and the second mirror group 103 are fixed when the long-focus lens is in the compressed state and the pop-up state. In this way, the long-focus lens does not need to set an optical stroke, a mechanism space and a reliability space for the movement of the optical element in the second direction V2, thereby reducing the total length of the optical path inside the electronic device, achieving good imaging effect, and making the structure of the camera module more compact, which is conducive to the size miniaturization of the camera module.

[0058] The long-focus lens in the embodiment of the present application can be mounted inside the shell of an electronic device. When the long-focus lens is in a compressed state, the distance between the first mirror group 101 and the first reflecting element 102 is relatively short, and each component in the long-focus lens is accommodated inside the shell. An optical aperture is provided outside the shell of the electronic device, and the first mirror group 101 faces the optical aperture and receives light reflected by the photographed object through the optical aperture. When the long-focus lens is in a pop-up state, the first mirror group 101 moves away from the first reflecting element 102 along the first direction V1, so that the distance between the first mirror group 101 and the first reflecting element 102 is increased. The first mirror group 101 and other components such as a decoration (Deco) are popped up to the outside of the shell, and the movement of the first mirror group 101 does not increase the thickness of the shell. For example, the pop-up distance of the long-focus lens in the embodiment of the present application can be between 3.5 mm and 4.5 mm, and specifically can be in the range of 3.9 mm to 4.1 mm. In this way, the focusing stroke of the long-focus lens can be transferred to the outside of the shell, the optical path length of the long-focus lens inside the shell is compressed, the volume ratio of the long-focus lens inside the shell can be reduced, and the volume space occupied by the long-focus lens in the electronic device is released. Therefore, the installation volume of the long-focus lens in the electronic device can be further reduced, and the internal space of the electronic device is saved.

[0059] In addition, during the movement of the first mirror group 101 along the first direction V1, the focal length of the long-focus lens can be changed, so that the focusing function of the long-focus lens can be realized during the movement of the first mirror group 101. During use, the automatic focusing function can be realized according to different focal length requirements. The long-focus lens in the embodiment of the present application has a two-group architecture, and the focusing function can be realized by moving the first mirror group 101. Therefore, the structure of the long-focus lens in the embodiment of the present application is relatively simple, and the long-focus lens can have the characteristics of high yield and low cost.

[0060] Therefore, the embodiment of the present application can break through the size limitation of the camera module and realize a long-focus lens with a large aperture, a large target surface, a small size, and a macro shooting function.

[0061] In a possible implementation, the long-focus lens in the embodiment of the present application can further include a second reflecting element 104 located between the second mirror group 103 and the optical path of the photosensitive element 105. The second reflecting element 104 is configured to reflect the light rays emitted by the second mirror group 103 to the photosensitive element 105. The second reflecting element 104 can fold the light path in the long-focus lens back to the first direction V1, and further reduce the volume of the long-focus lens. In a possible implementation, the second reflecting element 104 has at least one reflecting surface, and the number of reflections of the light path on the second reflecting element 104 can be greater than or equal to 1, for example, the second reflecting element 104 can include a second right-angle prism P2, which can fold the light path by 90 degrees, so as to fold the light rays emitted by the second mirror group 103 back to the first direction V1. Of course, the second reflecting element 104 can also be a plane mirror, a Schmidt prism or a pentagonal prism or other reflecting elements. In some cases, the second reflecting element 104 can also not be provided in the long-focus lens, or more reflecting elements can be provided between the second mirror group 103 and the photosensitive element 105, and the number and position of the reflecting elements in the long-focus lens can be reasonably set according to the mounting space of the long-focus lens in the electronic element.

[0062] In a possible implementation, the long-focus lens in the embodiment of the present application can further include a diaphragm 106 located on the light-incoming side of the first mirror group 101. The diaphragm 106 can limit the light rays incident into the long-focus lens, so as to adjust the intensity of the light rays and control the amount of light entering the long-focus lens.

[0063] When the structure of the long-focus lens is specifically set, the ratio of the focal length of the first mirror group 101 to the focal length of the long-focus lens in the compressed state can satisfy the following relationship: 0.5≤|F1 / Ft|≤2; wherein F1 is the focal length of the first mirror group 101, and Ft is the focal length of the long-focus lens in the compressed state. In this way, the long-focus lens can meet the focal length requirement of the telephoto function, and the telephoto function of the long-focus lens can have high imaging quality. And / or, the ratio of the focal length of the second mirror group 103 to the focal length of the long-focus lens in the compressed state can satisfy the following relationship: 0.1≤|F2 / Ft|≤1.2; wherein F2 is the focal length of the second mirror group 103, and Ft is the focal length of the long-focus lens in the compressed state. In this way, the long-focus lens can meet the focal length requirement of the macro function, and the magnification and resolution of the macro function of the long-focus lens can be improved.

[0064] The ratio of the moving distance of the first lens group 101 to the total track length (TTL) of the telephoto lens is in the range of 0.01-0.5 when the telephoto lens switches between the compressed state and the popped-out state. The total track length (TTL) is the total length of the light-in side of the first lens group 101 to the light-sensing surface of the light-sensing element 105 on the optical axis, as shown by the dashed line in Figure 1 . The optical axis refers to the light passing through the center of each lens. In this way, the moving distance of the first lens group 101 can meet the requirements of the macro function, realize the magnification function of different magnifications, and ensure that the telephoto lens does not protrude too much out of the shell of the electronic device due to the excessive pop-out distance, thereby ensuring the stability of the telephoto lens during the switching process between the compressed state and the popped-out state.

[0065] In addition, the focal length of the telephoto lens and the maximum half image height of the light-sensing element 105 can satisfy the following relationship: IMH / EFL<0.6; where IMH is the maximum half image height of the light-sensing element 105, and EFL is the effective focal length of the telephoto lens. The effective focal length (EFL) is a measure of the convergence or divergence of light in an optical system, which refers to the vertical distance from the optical center of the lens or lens group to the focal plane when an infinite scene forms a clear image on the focal plane through the lens or lens group. IMH can reflect the size of the light-sensing area of the light-sensing element 105. The maximum half image height (IMH) is half of the full image height of the image formed by the first lens group 101 and the second lens group 103, which is the maximum radius of the imaging circle. When designing the specific structure of the telephoto lens, adjusting the light-sensing area of the light-sensing element 105 will affect parameters such as the focal length of the telephoto lens. In the embodiments of the present application, the ratio of IMH to EFL is set to be less than 0.6, which can enable the telephoto lens to meet the requirements of long-focus shooting and have a larger light-sensing area.

[0066] In specific implementation, the number, shape, focal power, material, and position of the lenses included in the first lens group 101 and the second lens group 103 can be reasonably set to realize a telephoto lens with a large aperture, a large target surface, a small size, and a macro shooting function. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0067] Embodiment One

[0068] Figure 2 The structural schematic diagram of the telephoto lens provided in Embodiment One of the present application is shown in Figure 2 (1) of FIG. 1 is a structural schematic diagram of the telephoto lens in the compressed state, Figure 2 (2) of FIG. 1 is a structural schematic diagram of the telephoto lens in the popped-out state, as shown in Figure 2As shown in the embodiment one of the present application, the long-focus lens can include: a first mirror group 101, a first reflecting element 102, a second mirror group 103, a second reflecting element 104 and a photosensitive element 105. The first mirror group 101 has positive refractive power, and the first mirror group 101 can include three lenses, which are a first lens L1, a second lens L2 and a third lens L3 arranged in order from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, and the third lens L3 has negative refractive power. The second mirror group 103 has negative refractive power, and the second mirror group 103 can include five lenses, which are a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8 arranged in order from the object side to the image side. The fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power. Exemplarily, the first reflecting element 102 can include a first right-angle prism P1, and the second reflecting element 104 can include a second right-angle prism P2. In the optical path of the long-focus lens, the first reflecting element 102 and the second reflecting element 104 can be equivalent to a flat glass. In addition, a diaphragm can be further included on the light-incoming side of the first lens L1.

[0069] The light reflected by the photographed object passes through the diaphragm and then is incident on the first mirror group 101. After passing through the first lens L1, the second lens L2 and the third lens L3 in the first mirror group 101, the light is incident on the first right-angle prism P1. The light is turned by 90 degrees by the first right-angle prism P1 and then is incident on the second mirror group 103. After passing through the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 in the second mirror group 103, the light is turned by 90 degrees by the second right-angle prism P2 and then is incident on the photosensitive element 105, thereby realizing the photographing function.

[0070] When the long-focus lens is in the compressed state, the positions of the first mirror group 101, the first right-angle prism P1, the second mirror group 103 and the second right-angle prism P2 are fixed, and the long-focus lens realizes the telephoto function. When the long-focus lens is in the pop-up state, the first mirror group 101 moves towards the object side, and the positions of the first right-angle prism P1, the second mirror group 103 and the second right-angle prism P2 remain unchanged. During the movement of the first mirror group 101, the first lens L1, the second lens L2 and the third lens L3 move together, i.e., the relative positions of the first lens L1, the second lens L2 and the third lens L3 remain unchanged. Moreover, the shapes of the lenses in the first mirror group 101 and the second mirror group 103 remain unchanged when the long-focus lens is in the compressed state and the pop-up state.

[0071] The optical parameters of the components in the long-focus lens of the embodiment one can be as shown in Table 1.1.

[0072] Table 1.1 Optical parameters of components in long-focus lens of embodiment one

[0073]

[0074]

[0075] In Table 1.1, L1 represents the first lens, L2 represents the second lens, L3 represents the third lens, L4 represents the fourth lens, L5 represents the fifth lens, L6 represents the sixth lens, L7 represents the seventh lens, L8 represents the eighth lens, P1 represents the first right-angle prism, and P2 represents the second right-angle prism.

[0076] The thickness in Table 1.1 is the thickness of an optical element in the direction of the optical axis, or the thickness of an air gap between optical elements. For example, the thickness in the row of surface "1" is the distance along the optical axis from the stop to the object side of the first lens L1, the thickness in the row of surface "2" is the thickness of the first lens L1 in the direction of the optical axis, the thickness in the row of surface "1" is the distance along the optical axis from the image side of the first lens L1 to the object side of the second lens L2, and so on.

[0077] The material refers to the refractive index and Abbe number of an optical element. It should be noted that the values of the material in Table 1.1 are in the form of counts combined with the refractive index and Abbe number. The product of the front part of the decimal point in the value of the material in Table 1.1 and 0.001 plus 1 is the refractive index of the optical element, and the product of the rear part of the decimal point and 0.01 is the Abbe number of the optical element. For example, taking the first lens L1 as an example, the value of the material of the first lens L1 is 721.543, so the refractive index of the first lens L1 is 1.721, and the Abbe number of the first lens L1 is 54.3. Similarly, the values of the materials of the other lenses can be calculated.

[0078] The Y half aperture diameter refers to the size of the radius of an optical element.

[0079] In Embodiment One, the aspheric surface shape of each lens can be defined by, but not limited to, the following aspheric formula:

[0080]

[0081] wherein, the parameter c = 1 / R, that is, the curvature corresponding to the radius, r is the distance of a point on the optical surface to the optical axis, z represents the sag of the point in the direction of the optical axis, k is the quadratic surface coefficient of the surface, I is the aspheric coefficient term, which can be 30 in Embodiment One, and Ai is the aspheric coefficient.

[0082] The aspheric coefficients of each lens in Embodiment One are shown in Table 1.2. In Table 1.2, S1 represents the object side of the lens, and S2 represents the image side of the lens.

[0083] Table 1.2 Aspheric coefficients of each lens in the long-focus lens in Embodiment One

[0084]

[0085]

[0086] The optical parameters of the long-focus lens in Example One can be shown in Table 1.3:

[0087] Table 1.3 Optical parameters of the long-focus lens in Example One

[0088]

[0089] f1 f2 f3 f4 f5 f6 f7 f8 F1 F2 15.24 22.8 -21.05 -12.6 18.66 -362.94 -9.57 -8.829 17.07 -23.51

[0090] As shown in Table 1.3, IMH is half of the diagonal line of the photosensitive element, AF STROKE is the moving distance of the first lens group when the long-focus lens is converted from the compression state to the macro state, TTL is the total optical length, i.e. the distance between the light entrance side of the first lens group and the photosensitive surface of the photosensitive element. f1, f2, f3, f4, f5, f6, f7, and f8 are the focal lengths of the first lens to the eighth lens, respectively, and F1 and F2 are the focal lengths of the first lens group and the second lens group, respectively. As can be seen from Table 1.3, in Example One of the present application, the aperture number F# of the long-focus lens in the compression state is 1.74, and the aperture number F# in the pop-up state is 2.18. The long-focus lens in Example One has the characteristics of large aperture in both the compression state and the pop-up state. The total optical length TTL of the long-focus lens in Example One of the present application is 29.72 mm, and the total optical length is small, which can make the space occupied by the long-focus lens smaller.

[0091] Figure 3 Figure 1 is a modulation transfer function (MTF) curve diagram of the long-focus lens in Example One, Figure 3 (1) in Figure 1 is a modulation transfer function curve diagram of the long-focus lens in the compression state, Figure 3 (2) in Figure 1 is a modulation transfer function curve diagram of the long-focus lens in the pop-up state. As shown in Figure 3 , the abscissa represents different frequencies, and the ordinate represents the modulation contrast. The modulation transfer function can reflect the imaging resolution of different spatial frequencies, and from Figure 3 (1) and (2) in Figure 1, it can be seen that the long-focus lens in Example One has high imaging resolution in both the compression state and the pop-up state, and can realize high-quality imaging.

[0092] Example Two

[0093] Figure 4 Figure 1 is a structure diagram of the long-focus lens provided in Example Two of the present application, and Figure 1 is a structure diagram of the long-focus lens in the compression state, Figure 4 (1) in Figure 1 is a structure diagram of the long-focus lens in the compression state, Figure 4Fig. 2 is a structural schematic diagram of the long-focus lens in the pop-up state, Fig. 3 is a structural schematic diagram of the long-focus lens in the compressed state, and Fig. 4 is a structural schematic diagram of the long-focus lens in the pop-up state. Figure 4 As shown in the embodiment two of the present application, the long-focus lens can include a first mirror group 101, a first reflecting element 102, a second mirror group 103, a second reflecting element 104, and a photosensitive element 105. The first mirror group 101 has positive refractive power, and can include three lenses, i.e., a first lens L1, a second lens L2, and a third lens L3, which are sequentially arranged from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, and the third lens L3 has negative refractive power. The second mirror group 103 has negative refractive power, and can include five lenses, i.e., a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8, which are sequentially arranged from the object side to the image side. The fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power. Exemplarily, the first reflecting element 102 can include a first right-angle prism P1, and the second reflecting element 104 can include a second right-angle prism P2. In the optical path of the long-focus lens, the first reflecting element 102 and the second reflecting element 104 can be equivalent to a flat glass. In addition, a diaphragm can be further included on the light-incoming side of the first lens L1.

[0094] The light reflected by the photographed object passes through the diaphragm and then is incident on the first mirror group 101. After passing through the first lens L1, the second lens L2, and the third lens L3 in the first mirror group 101, the light is incident on the first right-angle prism P1. The light is folded by 90 degrees by the first right-angle prism P1 and then is incident on the second mirror group 103. After passing through the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in the second mirror group 103, the light is folded by 90 degrees by the second right-angle prism P2 and then is incident on the photosensitive element 105, thereby achieving the photographing function.

[0095] When the long-focus lens is in the compressed state, the positions of the first mirror group 101, the first right-angle prism P1, the second mirror group 103, and the second right-angle prism P2 are fixed, and the long-focus lens achieves the telephoto function. When the long-focus lens is in the pop-up state, the first mirror group 101 moves toward the object side, and the positions of the first right-angle prism P1, the second mirror group 103, and the second right-angle prism P2 remain unchanged. During the movement of the first mirror group 101, the first lens L1, the second lens L2, and the third lens L3 move together, i.e., the relative positions of the first lens L1, the second lens L2, and the third lens L3 remain unchanged. In addition, the shapes of the lenses in the first mirror group 101 and the second mirror group 103 remain unchanged when the long-focus lens is in the compressed state and the pop-up state.

[0096] The optical parameters of the components in the long-focus lens of the embodiment two can be as shown in Table 2.1.

[0097] Table 2.1 Optical parameters of each component in the long-focus lens of Example Two

[0098]

[0099]

[0100] In Table 2.1, L1 represents the first lens, L2 represents the second lens, L3 represents the third lens, L4 represents the fourth lens, L5 represents the fifth lens, L6 represents the sixth lens, L7 represents the seventh lens, L8 represents the eighth lens, P1 represents the first right-angle prism, and P2 represents the second right-angle prism.

[0101] The thickness in Table 2.1 is the thickness of an optical element in the direction of the optical axis, or the thickness of an air gap between optical elements. For example, the thickness in the row of surface “1” is the distance along the optical axis from the stop to the object side of the first lens L1, the thickness in the row of surface “2” is the thickness of the first lens L1 in the direction of the optical axis, the thickness in the row of surface “1” is the distance along the optical axis from the image side of the first lens L1 to the object side of the second lens L2, and so on.

[0102] The material refers to the refractive index and Abbe number of an optical element. It should be noted that the values of the material in Table 2.1 are in the form of counts combined with the refractive index and Abbe number. The product of the front part of the decimal point in the material value in Table 2.1 and 0.001 plus 1 is the refractive index of the optical element, and the product of the rear part of the decimal point and 0.01 is the Abbe number of the optical element. For example, taking the first lens L1 as an example, the material value of the first lens L1 is 755.523, the refractive index of the first lens L1 is 1.755, and the Abbe number of the first lens L1 is 52.3. Similarly, the refractive index and Abbe number of the other lenses can be calculated in the same way.

[0103] The Y half aperture diameter refers to the size of the radius of an optical element.

[0104] In Example Two, the aspheric surface shape of each lens can be defined using, but not limited to, the following aspheric formula:

[0105]

[0106] wherein, wherein the parameter c = 1 / R, i.e., the curvature corresponding to the radius, r is the distance of a point on the optical surface to the optical axis, z represents the sag of the point in the direction of the optical axis, k is the quadratic surface coefficient of the surface, I is the aspheric coefficient term, which can be 30 in Example Two, and Ai is the aspheric coefficient.

[0107] The aspheric coefficients of each lens in Example Two are shown in Table 2.2. In Table 2.2, S1 represents the object side of the lens, and S2 represents the image side of the lens.

[0108] Table 2.2 Asphericity coefficients of each lens in the long-focus lens in Example Two

[0109]

[0110]

[0111] The optical parameters of the long-focus lens in Example Two can be shown in Table 2.3:

[0112] Table 2.3 Optical parameters of the long-focus lens in Example Two

[0113]

[0114] f1 f2 f3 f4 f5 f6 f7 f8 F1 F2 15.46 29.12 -24.57 -19.58 17.62 -34.84 9.53 -8.24 17.85 -25.2

[0115] As shown in Table 2.3, IMH is half of the diagonal line of the photosensitive element, AF STROKE is the moving distance of the first lens group when the long-focus lens is converted from the compression state to the macro state, TTL is the total optical length, i.e. the distance between the light entrance side of the first lens group and the photosensitive surface of the photosensitive element. f1, f2, f3, f4, f5, f6, f7, and f8 are the focal lengths of the first lens to the eighth lens, respectively, and F1 and F2 are the focal lengths of the first lens group and the second lens group, respectively. As can be seen from Table 2.3, in Example Two of the present application, the F# of the long-focus lens in the compression state is 1.94, and the F# in the pop-up state is 2.45. The long-focus lens in Example Two has the characteristics of large aperture in both the compression state and the pop-up state. The total optical length TTL of the long-focus lens in Example Two of the present application is 30mm, and the total optical length is small, which can make the space occupied by the long-focus lens smaller.

[0116] Figure 5 Figure 1 is a modulation transfer function (MTF) curve of the long-focus lens in Example Two, Figure 5 (1) is the modulation transfer function curve of the long-focus lens in the compression state, Figure 5 (2) is the modulation transfer function curve of the long-focus lens in the pop-up state. As shown in Figure 5 , the abscissa represents different frequencies, and the ordinate represents the modulation contrast. The modulation transfer function can reflect the imaging resolution of different spatial frequencies, and from Figure 5 (1) and (2) in Figure 1, it can be seen that the long-focus lens in Example Two has high imaging resolution in both the compression state and the pop-up state, and can realize high-quality imaging.

[0117] Example Three

[0118] Figure 6 Figure 1 is a structure diagram of the long-focus lens provided in Example Three of the present application, as shown in Figure 6(1) is a structural schematic diagram of the long-focus lens in a compressed state, Figure 6 (2) is a structural schematic diagram of the long-focus lens in a pop-up state, as shown in Figure 6 In the third embodiment of the present application, the long-focus lens can include: a first mirror group 101, a first reflecting element 102, a second mirror group 103, and a photosensitive element 105. The first mirror group 101 has positive refractive power, and the first mirror group 101 can include three lenses, which are a first lens L1, a second lens L2, and a third lens L3, which are sequentially distributed from the object side to the image side. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, and the third lens L3 has negative refractive power. The second mirror group 103 has negative refractive power, and the second mirror group 103 can include five lenses, which are a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8, from the object side to the image side. The fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power. Exemplarily, the first reflecting element 102 can include a first right-angle prism P1, and in the optical path of the long-focus lens, the first reflecting element 102 can be equivalent to a flat glass. In addition, a diaphragm can also be included on the light-in side of the first lens L1.

[0119] The light reflected by the photographed object passes through the diaphragm and is then incident on the first mirror group 101. After passing through the first lens L1, the second lens L2, and the third lens L3 in the first mirror group 101, the light is incident on the first right-angle prism P1. The light is turned by 90 degrees by the first right-angle prism P1 and then is incident on the second mirror group 103. After passing through the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in the second mirror group 103, the light is incident on the photosensitive element 105, thereby achieving the photographing function.

[0120] When the long-focus lens is in the compressed state, the positions of the first mirror group 101, the first right-angle prism P1, and the second mirror group 103 are fixed, and the long-focus lens achieves the telephoto function. When the long-focus lens is in the pop-up state, the first mirror group 101 moves toward the object side, and the positions of the first right-angle prism P1 and the second mirror group 103 remain unchanged. During the movement of the first mirror group 101, the first lens L1, the second lens L2, and the third lens L3 move together, that is, the relative positions of the first lens L1, the second lens L2, and the third lens L3 remain unchanged. Moreover, the shapes of the lenses in the first mirror group 101 and the second mirror group 103 remain unchanged when the long-focus lens is in the compressed state and the pop-up state.

[0121] Compared with the first embodiment and the second embodiment, the second reflecting element can not be arranged in the long-focus lens in the third embodiment.

[0122] The optical parameters of the components in the long-focus lens of Example Three can be as shown in Table 3.1.

[0123] Table 3.1 Optical parameters of components in the long-focus lens of Example Three

[0124]

[0125] In Table 3.1, L1 represents the first lens, L2 represents the second lens, L3 represents the third lens, L4 represents the fourth lens, L5 represents the fifth lens, L6 represents the sixth lens, L7 represents the seventh lens, L8 represents the eighth lens, and P1 represents the first right-angle prism.

[0126] The thickness in Table 3.1 is the thickness of an optical element in the direction of the optical axis, or the thickness of an air gap between optical elements. For example, the thickness in the row of surface "1" is the distance along the optical axis from the stop to the object side of the first lens L1, the thickness in the row of surface "2" is the thickness of the first lens L1 in the direction of the optical axis, the thickness in the row of surface "1" is the distance along the optical axis from the image side of the first lens L1 to the object side of the second lens L2, and so on.

[0127] The material refers to the refractive index and Abbe number of an optical element. It should be noted that the values of the material in Table 3.1 are in the form of counts combined with the refractive index and Abbe number. The product of the front part of the decimal point in the value of the material in Table 3.1 and 0.001 plus 1 is the refractive index of the optical element, and the product of the rear part of the decimal point and 0.01 is the Abbe number of the optical element. For example, taking the first lens L1 as an example, the value of the material of the first lens L1 is 721.543, so the refractive index of the first lens L1 is 1.721, and the Abbe number of the first lens L1 is 54.3. Similarly, the refractive index and Abbe number of the other lenses can be calculated in the same way.

[0128] Y half-aperture is the size of the radius of an optical element.

[0129] In Example Three, the aspheric surface type of each lens can be defined using, but not limited to, the following aspheric formula:

[0130]

[0131] wherein, wherein the parameter c = 1 / R, i.e. the curvature corresponding to the radius, r is the distance of a point on the optical surface to the optical axis, z represents the sag of the point in the direction of the optical axis, k is the quadratic surface coefficient of the surface, I is the aspheric coefficient term, which can be 30 in Example Three, and Ai is the aspheric coefficient.

[0132] The aspheric coefficients of the lenses in Example Three are shown in Table 3.2. In Table 3.2, S1 represents the object side of the lens, and S2 represents the image side of the lens.

[0133] Table 3.2 Aspheric coefficients of each lens in the long-focus lens in Example Three

[0134]

[0135]

[0136] The optical parameters of the long-focus lens in Example Three can be shown in Table 3.3:

[0137] Table 3.3 Optical parameters of the long-focus lens in Example Three

[0138]

[0139] f1 f2 f3 f4 f5 f6 f7 f8 F1 F2 15.24 22.8 -21.05 -12.6 18.66 -362.94 -9.57 -8.829 17.07 -23.51

[0140] As shown in Table 3.3, IMH is half of the diagonal line of the photosensitive element, AF STROKE is the moving distance of the first lens group when the long-focus lens is converted from the compression state to the macro state, TTL is the total optical length, i.e. the distance between the light entrance side of the first lens group and the photosensitive surface of the photosensitive element. f1, f2, f3, f4, f5, f6, f7, and f8 are the focal lengths of the first lens to the eighth lens, respectively, and F1 and F2 are the focal lengths of the first lens group and the second lens group, respectively. As can be seen from Table 3.3, in Example Three of the present application, the F# of the long-focus lens in the compression state is 1.74, and the F# in the pop-up state is 2.18. The long-focus lens in Example Three has the characteristics of large aperture in both the compression state and the pop-up state. The total optical length TTL of the long-focus lens in Example Three of the present application is 26.01 mm, and the total optical length is small, which can make the space occupied by the long-focus lens smaller.

[0141] Figure 7 Figure 1 is a modulation transfer function (MTF) curve diagram of the long-focus lens in Example Three, Figure 7 (1) is the modulation transfer function curve diagram of the long-focus lens in the compression state, Figure 7 (2) is the modulation transfer function curve diagram of the long-focus lens in the pop-up state. As shown in Figure 7 , the abscissa represents different frequencies, and the ordinate represents the modulation contrast. The modulation transfer function can reflect the imaging resolution of different spatial frequencies, and from Figure 7 (1) and (2) in Figure 1, it can be seen that the long-focus lens in Example Three has high imaging resolution in both the compression state and the pop-up state, and can realize high-quality imaging.

[0142] Example Four

[0143] Figure 8 Figure 1 is a structure diagram of the long-focus lens provided in Example Four of the present application, and Figure 2 is a structure diagram of the long-focus lens provided in Example Four of the present application. Figure 8(1) is a structural schematic diagram of the long-focus lens in a compressed state, Figure 8 (2) is a structural schematic diagram of the long-focus lens in a pop-up state, as shown in Figure 8 In the fourth embodiment of the present application, the long-focus lens includes: a first mirror group 101, a first reflecting element 102, a second mirror group 103, a second reflecting element 104, and a photosensitive element 105. The first mirror group 101 has positive refractive power, and the first mirror group 101 can include two lenses, which are a first lens L1 and a second lens L2 distributed in order from the object side to the image side. The first lens L1 has positive refractive power, and the second lens L2 has negative refractive power. The second mirror group 103 has negative refractive power, and the second mirror group 103 can include six lenses, which are a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8 distributed in order from the object side to the image side. The third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, the sixth lens L6 has positive refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power. Exemplarily, the first reflecting element 102 can include a first right-angle prism P1, and the second reflecting element 104 can include a second right-angle prism P2. In the optical path of the long-focus lens, the first reflecting element 102 and the second reflecting element 104 can be equivalent to a flat glass. In addition, a diaphragm can also be included on the light-in side of the first lens L1.

[0144] The light reflected by the photographed object passes through the diaphragm and is incident on the first mirror group 101. After passing through the first lens L1 and the second lens L2 in the first mirror group 101, the light is incident on the first right-angle prism P1. The light is turned by 90 degrees by the first right-angle prism P1 and is incident on the second mirror group 103. After passing through the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in the second mirror group 103, the light is turned by 90 degrees by the second right-angle prism P2 and is incident on the photosensitive element 105, thereby realizing the photographing function.

[0145] When the long-focus lens is in the compressed state, the positions of the first mirror group 101, the first right-angle prism P1, the second mirror group 103, and the second right-angle prism P2 are fixed, and the long-focus lens realizes the telephoto function. When the long-focus lens is in the pop-up state, the first mirror group 101 moves towards the object side, and the positions of the first right-angle prism P1, the second mirror group 103, and the second right-angle prism P2 remain unchanged. During the movement of the first mirror group 101, the first lens L1 and the second lens L2 move together, that is, the relative positions of the first lens L1 and the second lens L2 remain unchanged. Moreover, the shapes of the lenses in the first mirror group 101 and the second mirror group 103 remain unchanged when the long-focus lens is in the compressed state and the pop-up state.

[0146] The optical parameters of the components in the long-focus lens of embodiment four can be as shown in Table 4.1.

[0147] Table 4.1 Optical parameters of components in the long-focus lens of embodiment four

[0148]

[0149] In Table 4.1, L1 represents the first lens, L2 represents the second lens, L3 represents the third lens, L4 represents the fourth lens, L5 represents the fifth lens, L6 represents the sixth lens, L7 represents the seventh lens, L8 represents the eighth lens, P1 represents the first right-angle prism, and P2 represents the second right-angle prism.

[0150] The thickness in Table 4.1 is the thickness of the optical element along the optical axis direction, or the thickness of the air gap between the optical elements. For example, the thickness in the row of surface “1” is the distance along the optical axis direction from the stop to the object side surface of the first lens L1, the thickness in the row of surface “2” is the thickness of the first lens L1 along the optical axis direction, the thickness in the row of surface “1” is the distance along the optical axis direction from the image side surface of the first lens L1 to the object side surface of the second lens L2, and so on.

[0151] The material refers to the refractive index and Abbe number of the optical element. It should be noted that the values of the material in Table 4.1 are in the form of counts combined with the refractive index and Abbe number. The product of the front part of the decimal point in the material value in Table 4.1 and 0.001 plus 1 is the refractive index of the optical element, and the product of the rear part of the decimal point and 0.01 is the Abbe number of the optical element. For example, taking the first lens L1 as an example, the material value of the first lens L1 is 755.523, so the refractive index of the first lens L1 is 1.755, and the Abbe number of the first lens L1 is 52.3. Similarly, the refractive index and Abbe number of the other lenses can be calculated in the same way.

[0152] The Y half aperture diameter refers to the size of the radius of the optical element.

[0153] In embodiment four, the aspheric surface type of each lens can be defined by, but not limited to, the following aspheric formula:

[0154]

[0155] wherein, wherein the parameter c = 1 / R, that is, the curvature corresponding to the radius, r is the distance of a point on the optical surface to the optical axis, z represents the sag of the point along the optical axis direction, k is the quadratic surface coefficient of the surface, I is the aspheric coefficient term, which can be 30 in embodiment four, and Ai is the aspheric coefficient.

[0156] The aspheric coefficients of the lenses in embodiment four are shown in Table 4.2. In Table 4.2, S1 represents the object side surface of the lens, and S2 represents the image side surface of the lens.

[0157] Table 4.2 Aspheric coefficients of each lens in the long-focus lens in Example Four

[0158]

[0159]

[0160] The optical parameters of the long-focus lens in Example Four can be shown in Table 4.3:

[0161] Table 4.3 Optical parameters of the long-focus lens in Example Four

[0162]

[0163] f1 f2 f3 f4 f5 f6 f7 f8 F1 F2 11.96 -31.07 -12.83 53.53 -507.14 13.31 12.64 -8.59 18.25 -42.51

[0164] As shown in Table 4.3, IMH is half of the diagonal line of the photosensitive element, AF STROKE is the moving distance of the first lens group when the long-focus lens is converted from the compression state to the macro state, TTL is the total optical length, i.e. the distance between the light entrance side of the first lens group and the photosensitive surface of the photosensitive element. f1, f2, f3, f4, f5, f6, f7, and f8 are the focal lengths of the first lens to the eighth lens, respectively, and F1 and F2 are the focal lengths of the first lens group and the second lens group, respectively. As can be seen from Table 4.3, in Example Four of the present application, the F# of the long-focus lens in the compression state is 1.80, and the F# in the pop-up state is 1.80. The long-focus lens in Example Four has the characteristics of large aperture in both the compression state and the pop-up state. The total optical length TTL of the long-focus lens in Example Four of the present application is 32.17 mm, and the total optical length is small, which can make the space occupied by the long-focus lens smaller.

[0165] Figure 9 Figure 1 is a modulation transfer function (MTF) curve of the long-focus lens in Example Four, Figure 9 (1) is the modulation transfer function curve of the long-focus lens in the compression state, Figure 9 (2) is the modulation transfer function curve of the long-focus lens in the pop-up state. As shown in Figure 9 , the abscissa represents different frequencies, and the ordinate represents the modulation contrast. The modulation transfer function can reflect the imaging resolution of different spatial frequencies, and from Figure 9 (1) and (2) in Figure 1, it can be seen that the long-focus lens in Example Four has high imaging resolution in both the compression state and the pop-up state, and can realize high-quality imaging.

[0166] Example Five

[0167] Figure 10 Figure 1 is a structure diagram of the long-focus lens provided in Example Five of the present application, as shown in Figure 10(1) is a structural schematic diagram of the long-focus lens in a compressed state, Figure 10 (2) is a structural schematic diagram of the long-focus lens in a pop-up state, as shown in Figure 10 In the embodiment five of the present application, the long-focus lens comprises: a first mirror group 101, a first reflecting element 102, a second mirror group 103, and a photosensitive element 105. The first mirror group 101 has positive refractive power, and the first mirror group 101 can comprise two lenses, which are a first lens L1 and a second lens L2 distributed in order from the object side to the image side. The first lens L1 has positive refractive power, and the second lens L2 has negative refractive power. The second mirror group 103 has negative refractive power, and the second mirror group 103 can comprise six lenses, which are a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8 distributed in order from the object side to the image side. The third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, the sixth lens L6 has positive refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power. Exemplarily, the first reflecting element 102 can comprise a first right-angle prism P1, and in the optical path of the long-focus lens, the first reflecting element 102 can be equivalent to a flat glass. In addition, a diaphragm can also be included on the light-incoming side of the first lens L1.

[0168] The light reflected by the photographed object passes through the diaphragm and then is incident on the first mirror group 101. After passing through the first lens L1 and the second lens L2 in the first mirror group 101, the light is incident on the first right-angle prism P1. The light is turned by 90 degrees by the first right-angle prism P1 and then is incident on the second mirror group 103. After passing through the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in the second mirror group 103, the light is incident on the photosensitive element 105, thereby achieving the photographing function.

[0169] When the long-focus lens is in the compressed state, the positions of the first mirror group 101, the first right-angle prism P1, and the second mirror group 103 are fixed, and the long-focus lens achieves the telephoto function. When the long-focus lens is in the pop-up state, the first mirror group 101 moves toward the object side, and the positions of the first right-angle prism P1 and the second mirror group 103 remain unchanged. During the movement of the first mirror group 101, the first lens L1 and the second lens L2 move together, that is, the relative positions of the first lens L1 and the second lens L2 remain unchanged. Moreover, the shapes of the lenses in the first mirror group 101 and the second mirror group 103 remain unchanged when the long-focus lens is in the compressed state and the pop-up state.

[0170] Compared with the above-mentioned embodiment four, the second reflecting element can not be arranged in the long-focus lens in the embodiment five.

[0171] The optical parameters of the components in the long-focus lens of the embodiment five can be as shown in Table 5.1.

[0172] Table 5.1 Optical parameters of each component in the long-focus lens of Example Five

[0173]

[0174] In Table 5.1, L1 represents the first lens, L2 represents the second lens, L3 represents the third lens, L4 represents the fourth lens, L5 represents the fifth lens, L6 represents the sixth lens, L7 represents the seventh lens, L8 represents the eighth lens, and P1 represents the first right-angle prism.

[0175] The thickness in Table 5.1 is the thickness of an optical element in the direction of the optical axis, or the thickness of an air gap between optical elements. For example, the thickness in the row of surface "1" is the distance along the optical axis from the stop to the object side of the first lens L1, the thickness in the row of surface "2" is the thickness of the first lens L1 in the direction of the optical axis, the thickness in the row of surface "1" is the distance along the optical axis from the image side of the first lens L1 to the object side of the second lens L2, and so on.

[0176] The material refers to the refractive index and Abbe number of an optical element. It should be noted that the values of the material in Table 5.1 are in the form of counts combined with the refractive index and Abbe number. The product of the front part of the decimal point in the material value in Table 5.1 and 0.001 plus 1 is the refractive index of the optical element, and the product of the rear part of the decimal point and 0.01 is the Abbe number of the optical element. For example, taking the first lens L1 as an example, the material value of the first lens L1 is 755.523, the refractive index of the first lens L1 is 1.755, and the Abbe number of the first lens L1 is 52.3. Similarly, the refractive index and Abbe number of the other lenses can be calculated in the same way.

[0177] The Y half aperture diameter refers to the size of the radius of an optical element.

[0178] In Example Five, the aspheric surface type of each lens can be defined using, but not limited to, the following aspheric formula:

[0179]

[0180] wherein, wherein the parameter c = 1 / R, that is, the curvature corresponding to the radius, r is the distance of a point on the optical surface to the optical axis, z represents the sag of the point in the direction of the optical axis, k is the quadratic surface coefficient of the surface, I is the aspheric coefficient term, which can be 30 in Example Five, and Ai is the aspheric coefficient.

[0181] The aspheric coefficients of each lens in Example Five are shown in Table 5.2. In Table 5.2, S1 represents the object side of the lens, and S2 represents the image side of the lens.

[0182] Table 5.2 Aspheric coefficients of each lens in the long-focus lens of Example Five

[0183]

[0184]

[0185] The optical parameters of the long-focus lens in Example Five can be shown in Table 5.3:

[0186] Table 5.3 Optical parameters of the long-focus lens in Example Five

[0187]

[0188] f1 f2 f3 f4 f5 f6 f7 f8 F1 F2 11.96 -31.07 -12.83 53.53 -507.14 13.31 12.64 -8.59 18.25 -42.51

[0189] As shown in Table 5.3, IMH is half of the diagonal of the photosensitive element, AF STROKE is the moving distance of the first lens group when the long-focus lens is converted from the compression state to the macro state, TTL is the total optical length, i.e. the distance between the light entrance side of the first lens group and the photosensitive surface of the photosensitive element. f1, f2, f3, f4, f5, f6, f7, and f8 are the focal lengths of the first lens to the eighth lens, respectively, and F1 and F2 are the focal lengths of the first lens group and the second lens group, respectively. As can be seen from Table 5.3, in Example Five of the present application, the F# of the long-focus lens in the compression state is 1.80, and the F# in the pop-up state is 2.27. The long-focus lens in Example Five has the characteristics of large aperture in both the compression state and the pop-up state. The total optical length TTL of the long-focus lens in Example Five of the present application is 29.1 mm, and the total optical length is small, which can make the space occupied by the long-focus lens smaller.

[0190] Figure 11 The modulation transfer function (MTF) curve of the long-focus lens in Example Five is shown in Figure 11 (1) is the modulation transfer function curve of the long-focus lens in the compression state, Figure 11 (2) is the modulation transfer function curve of the long-focus lens in the pop-up state. As shown in Figure 11 , the abscissa represents different frequencies, and the ordinate represents the modulation contrast. The modulation transfer function can reflect the imaging resolution of different spatial frequencies, and from Figure 11 (1) and (2) in the above table, it can be seen that the long-focus lens in Example Five has high imaging resolution in both the compression state and the pop-up state, and can realize high-quality imaging.

[0191] In the above embodiments of the present application, by reasonably setting the number of lenses in the first lens group 101 and the second lens group 103 and the optical power of each lens, and by jointly cooperating in terms of aperture, focal length, thickness, refractive index, Abbe number, refractive index temperature coefficient, and total optical length of the system, the long-focus lens realizes the characteristics of small volume, large aperture, low cost, high resolution, etc.

[0192] The above introduces several embodiments of the application, which are only used to illustrate the structure of the long-focus lens, and are not specific limitations on each lens in the long-focus lens. In specific implementation, the number, shape, optical power, material, position, etc. of each lens in the long-focus lens can be reasonably set according to the internal installation space of the electronic device, and the structure of the long-focus lens can be reasonably set. It should be noted that the numerical values and numerical ranges involved in the embodiments of the application are approximate values, and there may be a certain range of errors, which can be considered negligible by those skilled in the art.

[0193] Based on the same technical concept, the embodiments of the application also provide a camera module. The camera module provided by the embodiments of the application can include any of the above long-focus lenses and a control element. The control element can be used to control the long-focus lens to switch between the compressed state and the pop-up state. Since the above long-focus lens in the embodiments of the application has the characteristics of large aperture, large target surface, small size and macro shooting function, the shooting effect of the camera module including any of the above long-focus lenses is good.

[0194] Based on the same technical concept, the embodiments of the application also provide an electronic device. The electronic device provided by the embodiments of the application can include any of the above camera modules and a circuit board. The control element in the camera module is electrically connected to the circuit board. Since the shooting effect of the above camera module in the embodiments of the application is good, the shooting effect of the electronic device including any of the above camera modules is also good, and the user experience is good.

[0195] Although the preferred embodiments of the application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications falling within the scope of the application.

[0196] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the application without departing from the spirit and scope of the embodiments of the application. Thus, if these modifications and variations of the embodiments of the application fall within the scope of the claims of the application and their equivalent technologies, the application also intends to include these modifications and variations.

Claims

1. A long focus lens characterized by, The long-focus lens comprises: a first mirror group, a first reflecting element and a second mirror group; the first mirror group comprises at least one lens, each lens in the first mirror group is arranged along a first direction, and the first mirror group is used for transmitting light along the first direction; the first reflecting element is located on the light exit side of the first mirror group and is used for reflecting the light emitted by the first mirror group to a second direction; the first direction and the second direction form a set angle; the second mirror group is located on the light exit side of the first reflecting element, and the second mirror group comprises at least one lens, each lens in the second mirror group is arranged along a second direction; the second mirror group is used for transmitting the light reflected by the first reflecting element along the second direction; the first mirror group has positive focal power, and the second mirror group has negative focal power; the first reflecting element is relatively fixed with the second mirror group; the first mirror group can move relative to the first reflecting element along the first direction, so that the working state of the long-focus lens is switched between a compressed state and an extended state, and the long-focus lens realizes focusing function during the movement of the first mirror group; when the long-focus lens is in the compressed state, the distance between the light entrance surface of the first mirror group and the light entrance surface of the first reflecting element is a first distance, and the long-focus lens realizes telephoto function; when the long-focus lens is in the extended state, the distance between the light entrance surface of the first mirror group and the light entrance surface of the first reflecting element is a second distance, and the long-focus lens realizes macro function; the second distance is greater than the first distance.

2. The telephoto lens of claim 1, wherein The ratio of the focal length of the first mirror group to the focal length of the long-focus lens in the compressed state satisfies the following relationship: 0.5≤|F1 / Ft|≤2; wherein F1 is the focal length of the first mirror group, and Ft is the focal length of the long-focus lens in the compressed state.

3. The telephoto lens of claim 1, wherein The ratio of the focal length of the second mirror group to the focal length of the long-focus lens in the compressed state satisfies the following relationship: 0.1≤|F2 / Ft|≤1.2; wherein F2 is the focal length of the second mirror group, and Ft is the focal length of the long-focus lens in the compressed state.

4. The telephoto lens according to any one of claims 1 to 3, characterized in that, When the long-focus lens is switched between the compressed state and the extended state, the ratio of the moving distance of the first mirror group to the total optical length of the long-focus lens is within the range of 0.01-0.

5.

5. The telephoto lens according to any one of claims 1 to 4, characterized in that, The first mirror group comprises a first lens, a second lens and a third lens distributed in order from the object side to the image side; the first lens has positive focal power, the second lens has positive focal power, and the third lens has negative focal power; The second mirror group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens distributed in order from the object side to the image side; the fourth lens has negative focal power, the fifth lens has positive focal power, the sixth lens has negative focal power, the seventh lens has positive focal power, and the eighth lens has negative focal power.

6. The telephoto lens according to any one of claims 1 to 4, characterized in that, The first mirror group comprises a first lens and a second lens distributed in order from the object side to the image side; the first lens has positive focal power, and the second lens has negative focal power; The second mirror group comprises, in order from the object side to the image side, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the third lens has negative refractive power, the fourth lens has positive refractive power, the fifth lens has negative refractive power, the sixth lens has positive refractive power, the seventh lens has positive refractive power, and the eighth lens has negative refractive power.

7. The telephoto lens according to any one of claims 1 to 6, characterized in that, The long-focus lens further comprises a photosensitive element located on the light exit side of the second mirror group. The focal length of the long-focus lens and the maximum half image height of the photosensitive element satisfy the following relationship: IMH / EFL < 0.6; wherein IMH is the maximum half image height of the photosensitive element, and EFL is the focal length of the long-focus lens.

8. The telephoto lens of claim 7, wherein, The long-focus lens further comprises a second reflecting element located between the second mirror group and the optical path of the photosensitive element. The second reflecting element is used to reflect the light rays emitted by the second mirror group to the photosensitive element.

9. A camera module, comprising: The long-focus lens comprises: The long-focus lens according to any one of claims 1-8, and a control element; The control element is used to control the long-focus lens to switch between the compressed state and the ejected state.

10. An electronic device, comprising: The long-focus lens comprises: The camera module and the circuit board according to claim 9, wherein the control element in the camera module is electrically connected with the circuit board.

Images