CN111538145B - Zoom lens, camera module and electronic device - Google Patents

Abstract

The present application discloses a zoom lens, a camera module and an electronic device. The zoom lens includes an optical path changing element, a first lens assembly and a second lens assembly. The first lens assembly and the second lens assembly each include one lens group or multiple lens groups, each lens group including a plurality of mirrors. The external light is refracted by the optical path changing element and then directed to the first lens assembly, and the second lens assembly can move to the optical path formed by the optical path changing element and the first lens assembly or move out from the optical path. The zoom lens has a first focal length when the light passes through the first lens assembly for imaging; and when the light passes through the first lens assembly and the second lens assembly for imaging, the zoom lens has a focal length different from the first focal length. The present application utilizes the second lens assembly to move to or from the optical path formed by the optical path changing element and the first lens assembly to realize the zoom function, supplement the focal length position between the wide-angle main camera and the telephoto lens, and improve the imaging quality.

Description

Zoom Lenses, Camera Modules and Electronic Devices

technical field

The present application relates to the technical field of optical imaging, and in particular, to a zoom lens, a camera module and an electronic device.

Background technique

At present, the camera function of mobile phone cameras is becoming more and more powerful, but the image quality has never really reached the level of professional cameras. The reason is that it is difficult for mobile phone cameras to realize the optical zoom function. The zoom solution is not suitable for products that pursue thin and light such as mobile phones and tablets.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a zoom lens, a camera module, and an electronic device.

Embodiments of the present application provide a zoom lens, which includes an optical path changing element, a first lens assembly, and a second lens assembly. The first lens assembly includes one lens group or multiple lens groups. The second lens assembly includes a lens group or a plurality of lens groups, each of the lens groups including a plurality of mirrors. The external light is deflected by the optical path changing element and then directed to the first lens assembly, and the second lens assembly can move to the optical path formed by the optical path changing element and the first lens assembly or from the optical path Move out. The zoom lens has a first focal length when the light refracted by the optical path changing element only passes through the first lens assembly for imaging; and when the light refracted by the optical path changing element passes through the first lens The assembly and the second lens assembly are then imaged, and the zoom lens has a focal length different from the first focal length.

In some embodiments, the zoom lens includes a housing. The optical path changing element, the first lens assembly and the second lens assembly are all accommodated in the casing. The first lens assembly has a first optical axis. After the second lens assembly moves onto the optical path, the second lens assembly remains fixed relative to the housing, and the first lens assembly can move along the first optical axis to achieve focusing.

In certain embodiments, the first lens assembly includes a plurality of lens groups and the second lens assembly includes one or more lens groups. Moving the second lens assembly to the optical path includes: moving any one or more lens groups of the second lens assembly to between any two adjacent lens groups of the first lens assembly; or any one or more lens groups of the second lens assembly are moved between the optical path changing element and the first lens assembly; or any one or more lens groups of the second lens assembly are moved to the first lens assembly At the end of a lens assembly, the light after being turned by the optical path changing element passes through the first lens assembly and the second lens assembly in sequence.

In some embodiments, when the second lens assembly is located outside the optical path, the optical axis of any one lens group of the second lens assembly is parallel to the first optical axis.

In certain embodiments, the first lens assembly includes a plurality of lens groups and the second lens assembly includes two lens groups. Moving the second lens assembly to the optical path includes: moving one of the lens groups of the second lens assembly to a first position on the optical path, so that the zoom lens has a second focal length different from the first focal length ; or another lens group of the second lens assembly is moved to the first position, so that the zoom lens has a third focal length different from the first focal length, and the third focal length is different from the second focal length.

In some embodiments, when the second lens assembly is outside the optical path, the two lens groups of the second lens assembly are located on opposite sides of the optical path.

In some embodiments, when the second lens assembly is outside the optical path, the two lens groups of the second lens assembly are symmetrically distributed with respect to the first optical axis.

In some embodiments, when the second lens assembly is outside the optical path, the two lens groups of the second lens assembly are located on the same side of the optical path.

An embodiment of the present application further provides a camera module, wherein the camera module includes the zoom lens described in any one of the above embodiments and a photosensitive element, and the photosensitive element is configured to receive light emitted by the zoom lens for imaging.

An embodiment of the present application further provides an electronic device, the electronic device includes the camera module described in any one of the above embodiments, and the camera module is combined with the carrier.

The zoom lens, camera module and electronic device of the present application utilize the second lens assembly to move to the optical path formed by the optical path changing element and the first lens assembly or move out of the optical path to realize the zoom function, which supplements the wide-angle main camera and the telephoto lens between the focal length gears to improve image quality. In addition, zooming is realized without increasing the volume of the camera, which is beneficial to the lightness and thinness of the electronic device.

Additional aspects and advantages of embodiments of the present application will be set forth, in part, in the following description, and in part will be apparent from the following description, or learned by practice of the present application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

1 is a schematic structural diagram of an electronic device according to some embodiments of the present application;

2 is a schematic structural diagram of a camera module according to some embodiments of the present application;

3 is a schematic structural diagram of a camera module according to some embodiments of the present application;

4 is a schematic structural diagram of a camera module according to some embodiments of the present application;

5 is a schematic structural diagram of a camera module according to some embodiments of the present application;

6 is a schematic structural diagram of a camera module according to some embodiments of the present application;

7 is a schematic structural diagram of a camera module according to some embodiments of the present application;

8 is a schematic structural diagram of a camera module according to some embodiments of the present application;

9 is a schematic structural diagram of a camera module according to some embodiments of the present application;

10 is a schematic structural diagram of a camera module according to some embodiments of the present application;

11 is a schematic structural diagram of a camera module according to some embodiments of the present application;

12 is a schematic structural diagram of a camera module according to some embodiments of the present application;

13 is a schematic structural diagram of a camera module according to some embodiments of the present application;

14 is a schematic structural diagram of a camera module according to some embodiments of the present application;

15 is a schematic structural diagram of a camera module according to some embodiments of the present application;

16 is a schematic structural diagram of a camera module according to some embodiments of the present application;

17 is a schematic diagram of the relationship between imaging quality and equivalent focal length in a camera module according to some embodiments of the present application;

18 is a schematic diagram of the relationship between imaging quality and equivalent focal length in a camera module according to some embodiments of the present application;

19 is a schematic diagram of the relationship between imaging quality and equivalent focal length in a camera module according to some embodiments of the present application;

FIG. 20 is a schematic diagram of the relationship between imaging quality and equivalent focal length in a camera module according to some embodiments of the present application.

Detailed ways

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the embodiments of the present application, and should not be construed as limitations on the embodiments of the present application.

Please refer to FIG. 1 to FIG. 6 together. The electronic device 1000 according to the embodiment of the present application includes a carrier 100 and a camera module 200 mounted on the carrier 100 . The camera module 200 includes a zoom lens 210 and a photosensitive element 220 . The photosensitive element 220 is used for receiving the light emitted by the zoom lens 210 for imaging. The zoom lens 210 includes an optical path changing element 10 , a first lens assembly 20 , and a second lens assembly 30 . The first lens assembly 20 includes one lens group or a plurality of lens groups. The second lens assembly 30 includes one lens group or a plurality of lens groups, each lens group including a plurality of mirrors. The external light is deflected by the optical path changing element 10 and then directed to the first lens assembly 20 , and the second lens assembly 30 can move to the optical path formed by the optical path changing element 10 and the first lens assembly 20 or be removed from the optical path. The zoom lens 210 has a first focal length f1 when the light refracted by the optical path changing element 10 is only imaged through the first lens assembly 20 . When the light refracted by the optical path changing element 10 passes through the first lens assembly 20 and the second lens assembly 30 to form an image, the zoom lens 210 has a focal length different from the first focal length f1.

Specifically, the electronic device 1000 may be a mobile phone, a tablet computer, a notebook computer, or the like. The embodiments of the present application are described by taking the electronic device 1000 as a mobile phone as an example. It can be understood that the specific form of the electronic device 1000 may be other, which is not limited herein. The carrier 100 may be a casing of the electronic device 1000, such as a middle frame and a back cover of a mobile phone. The carrier 100 can be used as a functional element of the electronic device 1000 (such as a display screen, a camera, a processor, a receiver, a power supply module, a communication module, etc.) and a mounting carrier 100 for a mainboard. Drop, waterproof and other protection.

The zoom lens 210 , the camera module 200 and the electronic device 1000 of the present application utilize the second lens assembly 30 to move to the optical path formed by the optical path changing element 10 and the first lens assembly 20 or move out of the optical path to realize the zoom function, supplementing the wide angle The focal length gear between the main camera and the telephoto lens improves image quality. In addition, zooming is realized without increasing the volume of the camera, which is beneficial to the thinning of the electronic device 1000 .

Referring to FIGS. 2 and 4 , in some embodiments, the zoom lens 210 includes a housing 40 , and the optical path changing element 10 , the first lens assembly 20 and the second lens assembly 30 are all accommodated in the housing 40 . The first lens assembly 20 has a first optical axis OO1. After the second lens assembly 30 moves to the optical path, the second lens assembly 30 remains fixed relative to the housing 40, and the first lens assembly 20 can be positioned along the first optical axis OO1. Move to focus.

Specifically, moving the second lens assembly 30 on the optical path as a whole can make the zoom span of the zoom lens 210 larger than the zoom span of moving the singlet lens compared to moving the second lens assembly 30 on the optical path alone. It is larger, which is convenient for driving and operating, and is convenient for the manufacture and installation of the driving device. Compared with moving the second lens assembly 30 to the optical path as a whole, compared with moving the second lens assembly 30 to the optical path as a whole, the second lens assembly 30 only needs to be moved once to achieve a better zooming effect, the zooming time is shorter, and the zoom efficiency. In addition, only one driving device is required to move the second lens assembly 30 as a whole, and the driving device is simple and easy to operate. However, to move multiple lenses to the optical path, multiple driving devices or driving circuits need to be provided, which is complicated in operation and low in zooming efficiency. In addition, for the driving device for moving multiple lenses, if multiple driving devices are installed, the multiple driving devices will occupy the internal space of the camera module 200, increase the weight of the electronic device 1000, and be unfavorable for thinning; if only one driving device is installed , then this driving device needs to drive multiple lenses at the same time, and the driving operation is complicated.

In addition, the second lens assembly 30 remains fixed after moving to the optical path, that is, the position of the second lens assembly 30 on the optical path is fixed. In the initial state, the second lens assembly 30 is aligned with the fixed position and arranged on the optical path. other than (as shown in FIG. 2 ), the second lens assembly 30 only needs to move to a fixed position perpendicular to the first optical axis OO1 once, so that the zoom lens 210 can achieve a zoom effect and a clear image, which shortens the length of the zoom lens 210 The zoom time improves the zoom efficiency and enhances the user experience.

In addition, after the second lens assembly 30 is moved to the optical path, the first lens assembly 20 can be moved along the first optical axis OO1 to realize focusing, which can make the internal driving device of the zoom lens 210 simpler and facilitate operation and installation . Specifically, the driving device for driving the movement of the first lens assembly 20 and the driving device for driving the movement of the second lens assembly 30 may be the same driving device, or two different driving devices, which are not limited herein. If one driving device is provided, the driving device only needs to be provided with two driving lines, one driving line controls the movement of the second lens assembly 30 to the optical path, and the other driving line controls the movement of the first lens assembly 20 along the first optical axis OO1 , Simple operation, simple drive device, easy to operate and install. If two driving devices are provided, one driving device can drive the second lens assembly 30 to move on the optical path, and the other driving device can drive the first lens assembly 20 to move along the first optical axis. The driving device has a clear division of labor, and the driving device is simple. Easy to operate and install. In addition, after the second lens assembly 30 is moved to the optical path, the driving device of the zoom lens 210 drives the first lens assembly 20 to move along the first optical axis OO1 to achieve focusing, which makes the image clearer and improves the image quality. It should be noted that, driving the first lens assembly 20 to move includes driving any one or more lens groups in the first lens assembly 20 to move as a whole.

In addition, the optical path changing element 10 reflects the external light to the first lens assembly 20 and the second lens assembly 30, so that the first lens assembly 20 and the second lens assembly 30 do not need to be exposed to the air, and are not easily stained with dust and moisture, and are not easily affected. damage. The optical path changing element 10 may be a prism, a reflector, or the like, and the embodiments in this application are described by taking a prism as an example.

Please refer to FIGS. 2 to 16 together. In some embodiments, the first lens assembly 20 includes a plurality of lens groups, and the second lens assembly 30 includes one or more lens groups.

When the first lens assembly 20 includes multiple lens groups and the second lens assembly 30 includes one lens group, the embodiments in this application are described by taking the first lens assembly 20 including two lens groups as an example. The lens assembly 20 includes two lens groups, namely a first lens group 21 and a second lens group 22, and the second lens assembly 30 includes one lens group. In the initial state, the second lens assembly 30 is located outside the optical path, that is, the zoom lens 210 is in the state shown in FIG. 2 , and at this time, the zoom lens 210 has the first focal length f1 . The situation that the second lens assembly 30 moves to the optical path includes: the lens group of the second lens assembly 30 moves between any two adjacent lens groups of the first lens assembly 20. In an example, as shown in FIG. 3 , The lens group of the second lens assembly 30 is moved between the first lens group 21 and the second lens group 22, and the zoom lens 210 has a focal length f21 at this time. Or, the lens group of the second lens assembly 30 is moved between the optical path changing element 10 and the first lens assembly 20 . In one example, as shown in FIG. 5 , the lens group of the second lens assembly 30 is moved to the optical path changing element 10 Between the first lens group 21 and the zoom lens 210, the zoom lens 210 has a focal length f22. Or, the lens group of the second lens assembly 30 is moved to the end of the first lens assembly 20, so that the light refracted by the optical path changing element 10 passes through the first lens assembly 20 and the second lens assembly 30 in sequence (as shown in FIG. 6 ) , the zoom lens 210 has a focal length f23 at this time. When the second lens assembly 30 includes only one lens group, the structure is simple, the movement is simple, and the driving device is also relatively simple. In addition, the second lens assembly 30 only includes one lens group, which occupies less space of the camera module 200 , and can supplement the wide-angle main camera and the telephoto lens of the camera module 200 without increasing the volume of the camera module 200 . between focal lengths to improve image quality.

It should be noted that when the lens group of the second lens assembly 30 moves to different positions on the optical path, such as the three different positions shown in FIG. 3 , FIG. 5 and FIG. 6 , the zoom lens 210 has three different positions. The focal lengths of f21, f22, and f23, the three different focal lengths can all be greater than f1, so that the multi-stage zoom of the zoom lens 210 can be realized.

When the first lens assembly 20 includes a plurality of lens groups and the second lens assembly 30 includes a plurality of lens groups, in the embodiments of the present application, the first lens assembly 20 includes two lens groups, and the second lens assembly 30 also includes two lens groups. For example, the first lens assembly 20 includes two lens groups, namely the first lens group 21 and the second lens group 22, and the second lens assembly 30 also includes two lens groups, which are respectively The third lens group 31 and the fourth lens group 32 . In the initial state, the second lens assembly 30 is located outside the optical path, that is, the zoom lens 210 is in the state shown in FIG. 7 , and at this time, the zoom lens 210 has the first focal length f1 .

The situation in which the second lens assembly 30 moves onto the optical path includes two large moving situations. First, any one lens group in the second lens assembly 30 moves onto the optical path; second, a plurality of the second lens assemblies 30 move onto the optical path. The lens group is moved to the optical path.

Specifically, the situation where any one lens group in the second lens assembly 30 moves to the optical path includes: any one lens group in the second lens assembly 30 moves between any two adjacent lens groups in the first lens assembly 20 , or any one lens group of the second lens assembly 30 is moved between the optical path changing element 10 and the first lens assembly 20, and any one lens group of the second lens assembly 30 is moved to the end of the first lens assembly 20, so that the optical path The light refracted by the changing element 10 passes through the first lens assembly 20 and the second lens assembly 30 in sequence. More specifically, when the second lens assembly 30 includes two lens groups, namely the third lens group 31 and the fourth lens group 32 , the third lens group 31 may be moved to any two phases of the first lens assembly 20 . Between adjacent lens groups (as shown in FIG. 8 or FIG. 10 ), the fourth lens group 32 may also be moved between any two adjacent lens groups of the first lens assembly 20 (as shown in FIG. 9 ) . Or the third lens group 31 is moved between the optical path changing element 10 and the first lens assembly 20, or the fourth lens group 32 is moved between the optical path changing element 10 and the first lens assembly 20 (as shown in FIG. 11 ) . Or the third lens group 31 is moved to the end of the first lens assembly 20, so that the light refracted by the optical path changing element 10 passes through the first lens assembly 20 and the third lens group 31 in sequence (as shown in FIG. 12), or The fourth lens group 32 moves to the end of the first lens assembly 20 , so that the light rays refracted by the optical path changing element 10 pass through the first lens assembly 20 and the fourth lens group 32 in sequence (as shown in FIG. 13 ). After any lens group in the third lens assembly 30 is moved to the optical path, the zoom lens 210 has a focal length different from the first focal length f1, and the focal length at this time can be larger than f1 or smaller than f1, so that zooming can be achieved The multi-stage zoom of the lens 210.

The situation that the plurality of lens groups in the second lens assembly 30 are moved to the optical path includes: the plurality of lens groups of the second lens assembly 30 are moved between any two adjacent lens groups of the first lens assembly 20, or the second lens assembly 30 is moved to the optical path. The plurality of lens groups of the two-lens assembly 30 are moved between the optical path changing element 10 and the first lens assembly 20, or the two lens groups of the second lens assembly 30 are moved to the end of the first lens assembly 20, so that the optical path changing element The light refracted by 10 passes through the first lens assembly 20 and the second lens assembly 30 in sequence. Specifically, when the second lens assembly 30 includes two lens groups, the two lens groups of the second lens assembly 30 are both moved between any two adjacent lens groups of the first lens assembly 20 (as shown in FIG. 14 ) shown); or both lens groups of the second lens assembly 30 move between the optical path changing element 10 and the first lens assembly 20 (as shown in FIG. 15 ); or both lens groups of the second lens assembly 30 move To the end of the first lens assembly 20 , the light after being turned by the optical path changing element 10 passes through the first lens assembly 20 and the second lens assembly 30 in sequence (as shown in FIG. 16 ). After the plurality of lens groups in the third lens assembly 30 are moved to the optical path, the zoom lens 210 has a focal length different from the first focal length f1. At this time, the focal length may be larger than f1 or smaller than f1, so that multi-stage zooming of the zoom lens 210 can be realized.

To sum up, when the second lens assembly 30 includes multiple lens groups, the third lens assembly 30 can move to one lens group on the optical path, as shown in FIG. 10 , FIG. 11 , FIG. 12 and FIG. 13 , the structure is simple, The movement is simple and the driving device is also relatively simple, occupying less space of the camera module 200, and without increasing the volume of the camera module 200, the focal length file between the wide-angle main camera and the telephoto lens of the camera module 200 can be supplemented bit to improve image quality. The third lens assembly 30 may move to multiple lens groups on the optical path, as shown in FIG. 14 , FIG. 15 and FIG. 16 . At this time, the third lens assembly 30 occupies less space in the camera module 200 and increases more The lens group is connected to the optical path, so that the camera module 200 can have a longer focal length when shooting objects at a long distance, and the image is clearer.

Specifically, in one embodiment, the first lens assembly 20 includes two lens groups (a first lens group 21 and a second lens group 22 ), and the second lens assembly 30 includes one lens group. When the zoom lens 210 performs a zooming operation, the third lens assembly 30 may be moved between the first lens group 21 and the second lens group 22 (as shown in FIG. 3 ), or the third lens assembly 30 may be moved to change the optical path between the element 10 and the first lens group 21 (as shown in FIG. 5 ), or move the third lens assembly 30 to the back of the second lens group 22 , so that the light refracted by the optical path changing element 10 passes through the first lens in sequence Group 21 , second lens group 22 and third lens assembly 30 (as shown in FIG. 6 ). All in all, the moving position of the third lens assembly 30 is not limited to only one point, and can be adjusted according to the zooming needs of the zoom lens 210 . image quality.

In another embodiment, the first lens assembly 20 includes two lens groups (the first lens group 21 and the second lens group 22), and the second lens assembly 30 also includes two lens groups (the third lens group 31 and the second lens group 22). Four-lens group 32). When the zoom lens 210 performs a zooming operation, the third lens group 31 and the fourth lens group 32 may be moved between the first lens group 21 and the second lens group 22 (as shown in FIG. 14 ), or the third lens group 31 may be moved The group 31 and the fourth lens group 32 are moved between the optical path changing element 10 and the first lens group 21 (as shown in FIG. 15 ), or the third lens group 31 and the fourth lens group 32 are moved to the second lens group 22 After the light path changing element 10 is turned, the light rays pass through the first lens group 21 , the second lens group 22 , the third lens group 31 and the fourth lens group 32 in sequence (as shown in FIG. 16 ). All in all, the moving positions of the third lens group 31 and the fourth lens group 32 are not limited to only one point, and can be adjusted according to the zooming needs of the zoom lens 210 . The zoom lens is realized without increasing the overall length of the zoom lens 210 . 210 zoom function, improve the image quality.

It should be noted that, when the second lens assembly 30 is located outside the optical path, the optical axis of any lens group of the second lens assembly 30 is parallel to the first optical axis OO1. It can be understood that when the second lens assembly 30 is located outside the optical path, the first optical axis OO1 of the first lens assembly 20 and the optical axis of any lens group of the second lens assembly 30 are parallel, as shown in the second lens assembly in FIG. 2 . The optical axis OO2 is parallel to the first optical axis OO1, the third optical axis OO3 and the fourth optical axis OO4 in FIG. 7 are all parallel to the first optical axis OO1, and the fifth optical axis OO5 in FIG. 14 is parallel to the first optical axis OO1 By being parallel, stray light can be effectively prevented from being reflected into the optical path of the captured image through the second lens assembly 30, and the imaging quality can be improved.

Referring to FIG. 7 , FIG. 10 or FIG. 14 , in some embodiments, the first lens assembly 20 includes a plurality of lens groups, and the second lens assembly 30 includes two lens groups. Moving the second lens assembly 30 to the optical path includes: moving one of the lens groups of the second lens assembly 30 to a first position on the optical path, so that the zoom lens 210 has a second focal length different from the first focal length; or the second lens assembly 30 The other lens group is moved to the first position, so that the zoom lens 210 has a third focal length different from the first focal length, and the third focal length is different from the second focal length.

Specifically, referring to FIG. 7 , in one embodiment, the first lens assembly 20 includes two lens groups, namely, a first lens group 21 and a second lens group 22, and the second lens assembly 30 includes two lens groups, A third lens group 31 and a fourth lens group 32 are included. One of the lens groups of the second lens assembly 30 is moved to the first position of the optical path, that is, the third lens group 31 can be moved to the first position (as shown in FIG. 8 ), so that the zoom lens 210 has the same A second focal length f2 with a different focal length f1. In addition, the fourth lens group 32 may also be moved to the first position (as shown in FIG. 9 ), so that the zoom lens 210 has a third focal length f3 different from the first focal length f1. The first position may refer to any position in the light path passing through the first lens assembly 20, and the third lens group 31 and the fourth lens group 32 are moved to the first position, that is, the third lens group 31 and the fourth lens group 32 are moved to the first position. The four lens groups 32 are moved to the same position, so that the driving circuit of the driving device inside the camera module 200 is simple and the driving operation is simple. In addition, by moving the third lens group 31 to the first position or the fourth lens group 32 to the first position, the focal length range between the wide-angle main camera and the telephoto lens can be increased, and the focal length range of the camera module 200 can be enriched , improve imaging quality and enhance user experience.

It should be noted that the state changes shown in FIG. 7 to FIG. 9 are used as examples for description below. The magnitude relationship between the first focal length f1, the second focal length f2 and the third focal length f3 may be f2>f1>f3, or it may be f3>f1>f2, or f1>f2>f3, or f1<f2<f3, which is not limited here. That is to say, the values of the first focal length f1 , the second focal length f2 and the third focal length f3 are determined according to the imaging resolution required by the zoom lens 210 during specific shooting. The size relationship of the first focal length f1, the second focal length f2, and the third focal length f3 can all be converted into an equivalent focal length of a 35mm frame for comparison.

It can be understood that the imaging quality of the zoom lens 210 at different focal lengths is different. As shown in FIG. 17 , when the equivalent focal length is 25 mm and the equivalent focal length is 150 mm, the imaging quality is very good, and when the equivalent focal length is 25 mm and For the focal length position between 150mm, the image quality continues to decrease with the increase of the digital zoom factor. By increasing the equivalent focal length of the intermediate gear in the equivalent focal length between 25mm and 150mm, as shown in Figure 18, the imaging quality of the intermediate focal length of the equivalent focal length of 25mm and the equivalent focal length of 150mm can be significantly improved.

Specifically, in one embodiment, the camera module 200 further includes a main camera, and the main camera and the zoom lens 210 form a camera module. If it is assumed that the focal length of the main camera is f, the first focal length f1, the second focal length f2 and the third The size relationship of the focal length f3 can be f<f2<f3<f1 (as shown in FIG. 19 ). It can be seen from FIG. 19 that if the third lens group 31 is not added, the focal length of the zoom lens 210 is the focal length f21, and if the third lens group 31 is not added, the focal length of the zoom lens 210 is f21. When the fourth lens group 32 is used, the focal length of the zoom lens 210 is f31. After the third lens group 31 is added to the optical path, the focal length of the zoom lens 210 is changed from f21 to f22. After the fourth lens group 32 is added to the optical path, the zoom lens The focal length of the lens 210 is changed from f31 to f32. Among them, f22>f21, f32>f31, compared with the previous case where the third lens group 31 and the fourth lens group 32 are not added, after adding the third lens group 31 or the fourth lens group 32, the imaging quality of the zoom lens 210 better.

In another embodiment, the magnitude relationship between the first focal length f1, the second focal length f2, and the third focal length f3 may also be f<f2<f1<f3 (as shown in FIG. 20 ). Similarly, it can be seen from FIG. 20 that, If the focal length of the zoom lens 210 is f21 when the third lens group 31 is not added, and the focal length of the zoom lens 210 is f31 when the fourth lens group 32 is not added, after adding the third lens group 31 to the optical path, The focal length of the zoom lens 210 is changed from f21 to f22, and after the fourth lens group 32 is added to the optical path, the focal length of the zoom lens 210 is changed from f31 to f32. Among them, f22>f21, f32>f31, compared with the case where the third lens group 31 and the fourth lens group 32 are not added before, after adding the third lens group 31 or the fourth lens group 32, the imaging quality of the zoom lens 210 better.

To sum up, in the present application, by adding the third lens group 31 or the fourth lens group 32 to the zoom lens 210, the camera module 200 can adjust the focal length according to the distance of the shooting distance, supplementing the difference between the wide-angle main camera and the telephoto lens. The focal length position improves the imaging quality of the camera module 200 and enhances the user experience.

In some embodiments, when the second lens assembly 30 is outside the optical path, the two lens groups of the second lens assembly 30 are located on opposite sides of the optical path. Disposing the two lenses of the second lens assembly 30 on opposite sides of the optical path can reduce the occupation of the internal space of the camera module 200 , and the arrangement is more reasonable and orderly, which is beneficial to the thinning of the electronic device 1000 .

Referring to FIG. 7 , in some embodiments, when the second lens assembly 30 is outside the optical path, the two lens groups of the second lens assembly 30 are symmetrically distributed about the first optical axis OO1, which can reduce the occupation of the interior of the zoom lens 210 The space and arrangement are more reasonable and orderly, which is beneficial to the thinning of the electronic device 1000 . In addition, the symmetrical distribution of the two lens groups of the second lens assembly 30 about the first optical axis OO1 is also beneficial to simplify the moving route of the two lens groups of the second lens assembly 30, which is convenient for operation, and the driving device is simple, which is beneficial to the camera module. 200 mass production.

Referring to FIG. 10 or FIG. 14 , in some embodiments, when the second lens assembly 30 is outside the optical path, the two lens groups of the second lens assembly 30 are located on the same side of the optical path. When the two lens groups of the second lens assembly 30 are located on the same side of the optical path, it is convenient to drive the two lens groups at the same time, thereby shortening the zooming time and improving the zooming efficiency.

The photosensitive element 220 includes an image sensor, which may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS). The light converged to the photosensitive element 22 is first processed and then converted into an electrical signal, and then the electrical signal is converted into a digital signal by an analog-to-digital converter chip (ADC), and the digital signal is processed for imaging. .

It should be noted that the driving device for driving the first lens assembly 20 or the second lens assembly 30 in the camera module 200 may be an actuator, such as an electrostatic actuator, an electromagnetic actuator, or a magnetostrictive actuator. actuators, piezoelectric actuators, piezoelectric motors, stepper motors, or electroactive polymer actuators, etc.

The drive means may comprise one or more actuators. When the driving device is an actuator, the actuator can drive one or more lens groups in the first lens assembly 20 or the second lens assembly 30 simultaneously or in time division. Only one actuator is installed, which facilitates disassembly, simplifies the internal structure of the camera module 200 , and is beneficial to the thinning of the electronic device 1000 .

When the driving device is a plurality of actuators, take two actuators as an example, that is, the driving device includes a first actuator and a second actuator, and the first actuator drives one of the first lens assemblies 20 or multiple lens groups, the second actuator drives one or more lens groups in the second lens assembly 30 . The first actuator and the second actuator may perform the driving operation at the same time, or may perform the driving operation in a time-sharing manner. Installing multiple actuators can greatly increase the power supply of the camera module 200 and enhance the moving efficiency of the first lens assembly 20 and the second lens assembly 30 . In addition, by installing a plurality of actuators in the camera module 200, one or more actuators can be reserved and stored in the camera module 200 as spares, and when one actuator is damaged, the damaged actuator can be replaced in time. , to enhance the user experience.

Claims (9)

1. A zoom lens, characterized in that it comprises an optical path changing element, a first lens assembly and a second lens assembly; the first lens assembly includes a lens group or a plurality of lens groups; the second lens assembly includes a A lens group or a plurality of lens groups, each of the lens groups includes a plurality of mirrors; the external light is refracted by the optical path changing element and then directed to the first lens assembly, and the second lens assembly can move to the optical path changing the optical path formed by the element with the first lens assembly or removed from the optical path; wherein: When the light refracted by the optical path changing element is imaged only through the first lens assembly, the zoom lens has a first focal length; and When the light refracted by the optical path changing element passes through the first lens assembly and the second lens assembly to form an image, the zoom lens has a focal length different from the first focal length; The first lens assembly includes a plurality of lens groups, the second lens assembly includes one or more lens groups, and the movement of the second lens assembly to the optical path includes: any one or more lens groups of the second lens assembly are moved between any two adjacent lens groups of the first lens assembly; or any one or more lens groups of the second lens assembly are moved between the optical path changing element and the first lens assembly; or Any one or more lens groups of the second lens assembly are moved to the end of the first lens assembly, so that the light refracted by the optical path changing element passes through the first lens assembly and the second lens in sequence components. 2 . The zoom lens according to claim 1 , wherein the zoom lens comprises a casing, and the optical path changing element, the first lens assembly and the second lens assembly are all accommodated in the casing; A lens assembly has a first optical axis, after the second lens assembly is moved to the optical path, the second lens assembly remains fixed relative to the housing, and the first lens assembly can move along the first optical axis. Move on an optical axis to achieve focusing. 3 . The zoom lens according to claim 2 , wherein when the second lens assembly is located outside the optical path, the optical axis of any one lens group of the second lens assembly is the same as that of the second lens assembly. 4 . An optical axis is parallel. 4 . The zoom lens of claim 2 , wherein the first lens assembly includes a plurality of lens groups, the second lens assembly includes two lens groups, and the second lens assembly moves to the The light path includes: one of the lens groups of the second lens assembly is moved to the first position of the optical path so that the zoom lens has a second focal length different from the first focal length; or The other lens group of the second lens assembly is moved to the first position, so that the zoom lens has a third focal length different from the first focal length, and the third focal length is different from the second focal length. 5 . The zoom lens according to claim 4 , wherein when the second lens assembly is outside the optical path, the two lens groups of the second lens assembly are located on opposite sides of the optical path. 6 . . 6 . The zoom lens according to claim 4 , wherein when the second lens assembly is outside the optical path, the two lens groups of the second lens assembly are symmetrically distributed with respect to the first optical axis. 7 . . 7 . The zoom lens according to claim 4 , wherein when the second lens assembly is outside the optical path, two lens groups of the second lens assembly are located on the same side of the optical path. 8 . 8. A camera module, comprising: The zoom lens of any one of claims 1 to 7; and A photosensitive element, the photosensitive element is used for receiving the light emitted by the zoom lens to perform imaging. 9. An electronic device, characterized in that, comprising: The camera module of claim 8; and A carrier, the camera module is combined with the carrier.

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