Lens focusing assembly, camera module and electronic device

Abstract

Provided in the present application are a lens focusing assembly, a camera module and an electronic device. The lens focusing assembly comprises a first lens mounting seat, a shell and a displacement detection device. The displacement detection device performs position detection by means of one magnetic sensor and three magnetic members (magnetic detection assemblies). Each magnetic member of a first magnetic member and a third magnetic member has opposite magnetic polarities on two sides thereof in a second direction, and a second magnetic member has opposite magnetic polarities on two sides thereof in a first direction. Moreover, the polarities of the second magnetic member close to the first magnetic member and the third magnetic member are the same as the magnetic polarities of the sides of the first magnetic member and the third magnetic member that face the shell, respectively. When the magnetic sensor fixedly arranged on the shell translates relative to the magnetic detection assemblies fixedly arranged on the first lens mounting seat, the position of the magnetic field intensity peak corresponding to the magnetic sensor is farther away from the second magnetic member, thereby effectively increasing an effective detection stroke of the displacement detection device, and reducing costs.

Description

Lens focusing assembly, camera module and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202420749199.7, filed on April 11, 2024, and entitled "Lens focusing assembly, camera module and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of terminals, and in particular to a lens focusing assembly, a camera module and an electronic device. BACKGROUND

[0003] In recent years, with the increasingly rapid technology update of electronic devices, users have increasingly high requirements for the imaging quality of camera modules. In order to improve the imaging quality of camera modules, more and more camera modules of electronic devices begin to be configured with an anti-shake function and an automatic zoom function. In order to compensate for the influence of shaking and realize the automatic zoom function, a sensor with a long stroke and high-precision position detection function needs to be used for position feedback.

[0004] In the prior art, the displacement detection device of the lens focusing assembly in the camera module usually realizes position detection through the mutual cooperation between the magnetic sensor and the magnetic assembly. The magnetic assembly includes two magnetic pieces, which are fixedly arranged on the moving piece (i.e., the lens mounting seat for mounting the lens lens group, also referred to as the mover) of the lens focusing assembly along a first direction (the first direction is the optical axis direction) and are adjacent to each other, and the magnetic poles on the same side are opposite. The magnetic sensor is fixedly arranged on the fixed piece (i.e., the shell, also referred to as the stator) of the lens focusing assembly and is arranged correspondingly with the magnetic assembly. The magnetic field strength around the magnetic assembly is different, when the magnetic assembly moves along the first direction relative to the fixed piece with the moving piece of the lens focusing assembly, the relative position of the magnetic sensor and the magnetic assembly changes, the magnetic field strength detected by the magnetic sensor changes, and the controller (for example, can be a chip) determines the real-time position of the moving piece according to the change of the received magnetic field strength, so as to control the driving device of the lens focusing assembly to drive the moving piece to move to the target position according to the real-time position. However, during the movement of the moving piece, the magnetic field strength detected by the magnetic sensor when the moving piece moves to each position is different, so that the current position of the moving piece can be accurately determined. The magnetic field strength of a certain size range (along the first direction) around the joint of the two magnetic pieces is different, and the size range is the distance between the positions corresponding to the peak values of the magnetic field strength detected by the magnetic sensor when the magnetic sensor translates relative to the magnetic assembly along the first direction. Therefore, the effective detection stroke of the magnetic sensor can be understood as the distance between the positions corresponding to the peak values of the magnetic field strength around the joint of the two magnetic pieces.

[0005] In one example scenario, the displacement detection device of the lens focusing assembly adopts a sensor plus two magnetic pieces to detect the position, but the distance between the positions corresponding to the peak magnetic field strength around the joint of the two magnetic pieces is within 1 mm, that is, the effective detection range of the magnetic sensor is within 1 mm, and the effective detection range is short. In another example scenario, the displacement detection device of the lens focusing assembly adopts two or three sensors plus two magnetic pieces to detect the position, and the effective detection range of each sensor is combined to obtain a total effective detection range. Although the total effective detection range is improved compared to the single sensor case, the total effective detection range is at most 2 mm, and cannot be further improved. However, multiple sensors increase the cost of the lens focusing assembly, and require more magnetic field signal collection channels, increase the running burden of the controller, and have high requirements on the technical capability of the controller, and the applicability is limited.

[0006] It can be seen that the effective detection range of the displacement detection device of the lens focusing assembly in the prior art is small, and the scheme of using multiple sensors has high detection cost, high requirements on the technical capability of the controller, and limited applicability. SUMMARY

[0007] The present application provides a lens focusing assembly, a camera module and an electronic device, which solve the problem of the small effective detection range of the displacement detection device of the lens focusing assembly in the prior art, and the scheme of using multiple sensors has high detection cost, high requirements on the technical capability of the controller, and limited applicability.

[0008] The present application provides a lens focusing assembly, a camera module and an electronic device, which solve the problem of the small effective detection range of the displacement detection device of the lens focusing assembly in the prior art, and the scheme of using multiple sensors has high detection cost, high requirements on the technical capability of the controller, and limited applicability.

[0009] The displacement detection device includes a detection magnetic assembly and a magnetic sensor, and the detection magnetic assembly is fixedly arranged on the first lens mount. The magnetic sensor is fixedly arranged on the shell at a position corresponding to the detection magnetic assembly.

[0010] The detection magnetic assembly includes a first magnetic piece, a second magnetic piece and a third magnetic piece arranged in sequence in the first direction. The magnetic poles on the two sides of each of the first magnetic piece and the third magnetic piece in the second direction are opposite in polarity. The magnetic poles on the two sides of the second magnetic piece in the first direction are opposite in polarity. The magnetic pole on the side of the first magnetic piece facing the shell is the same in polarity as the magnetic pole on the side of the second magnetic piece close to the first magnetic piece. The magnetic pole on the side of the third magnetic piece facing the shell is the same in polarity as the magnetic pole on the side of the second magnetic piece close to the third magnetic piece. The first direction is the optical axis direction of the first lens group, and the second direction is perpendicular to the first direction.

[0011] The displacement detection device of the lens focusing assembly in the application adopts a magnetic sensor plus three magnetic pieces to detect the position. Specifically, the polarity of the two sides of each of the first magnetic piece and the third magnetic piece in the second direction is opposite, and the polarity of the two sides of the second magnetic piece in the first direction is opposite (or can be understood as, the first magnetic piece and the third magnetic piece are magnetized in the second direction, the second magnetic piece is magnetized in the first direction, and the magnetization direction of the second magnetic piece is perpendicular to the magnetization direction of the first magnetic piece and the third magnetic piece). And the polarity of the second magnetic piece close to the first magnetic piece and the third magnetic piece is the same as the polarity of the side of the first magnetic piece and the third magnetic piece facing the shell. Detecting the magnetic pole polarity distribution of the three magnetic pieces in the detection magnetic assembly makes the position corresponding to the detected magnetic field intensity peak of the magnetic sensor relative to the detection magnetic assembly in the first direction more far away from the second magnetic piece (or can be understood as, the distance between the positions corresponding to the detected magnetic field intensity peak increases), greatly increasing the effective detection stroke of the magnetic sensor (for example, the effective detection stroke can reach more than 2mm, even more than 6mm). And only one magnetic sensor is used in the displacement detection device of the embodiment, which effectively reduces the cost of the lens focusing assembly compared with the two or three sensor mode, and the technical ability requirement of the controller (for example, it can be a chip) is low, and the applicability is wider.

[0012] Therefore, the lens focusing assembly provided by the embodiment of the application only needs to adopt a magnetic sensor plus three magnetic pieces to detect the position, and by setting the magnetic pole polarity distribution of the three magnetic pieces in the detection magnetic assembly, the position corresponding to the magnetic field intensity peak of the magnetic sensor relative to the detection magnetic assembly can be made more far away from the second magnetic piece, thereby effectively increasing the effective detection stroke of the displacement detection device. And only one magnetic sensor is used, which reduces the cost of the lens focusing assembly, and the technical ability requirement of the controller is low, and the applicability is wider. Therefore, the problem of small effective detection stroke of the displacement detection device of the lens focusing assembly in the prior art, and the high detection cost of the multiple sensor solution, the high technical ability requirement of the controller, and the relatively limited applicability are solved.

[0013] In some embodiments, there are two displacement detection devices, and the two displacement detection devices are respectively arranged between the corresponding sides of the first lens mount and the shell in the second direction.

[0014] By adopting the above scheme, the displacement detection device is arranged on both sides of the first lens mount in the second direction. The adverse effects of the displacement of the first lens mount relative to the shell in the second direction on the position detection accuracy can be effectively avoided, and the adverse effects on the focusing / zooming effect of the lens focusing assembly can be avoided.

[0015] In some embodiments, the two displacement detection devices are symmetrically arranged. Through such an arrangement, when the first lens mount is offset relative to the housing in the second direction, it is more convenient to fit and calculate the sensing signals, thereby reducing the computational burden of the controller.

[0016] In some embodiments, the lens focusing assembly further comprises a driving device for driving the first lens mount to slide relative to the housing along the first direction, and the driving device comprises a driving magnetic component fixedly arranged on the first lens mount and a coil fixedly arranged on the housing at a position corresponding to the driving magnetic component. The detection magnetic component is multiplexed as the driving magnetic component.

[0017] Through such an arrangement, the detection magnetic component is multiplexed as the driving magnetic component, thereby reducing the volume of the lens focusing assembly and facilitating the miniaturization of the electronic device. Moreover, it is conducive to reducing the production cost of the lens focusing assembly.

[0018] In some embodiments, the size of the second magnetic member in the first direction is 0.4-5mm. Through such an arrangement, the effective detection stroke of the displacement detection device is effectively improved within the limited space of the lens focusing assembly.

[0019] In some embodiments, the sizes of the first magnetic member and the third magnetic member in the first direction are equal. Through the above arrangement, the interchangeability of the first magnetic member and the third magnetic member is better, thereby facilitating the production and cost reduction of the lens focusing assembly.

[0020] In some embodiments, the detection direction of the magnetic sensor is the second direction.

[0021] In some embodiments, the lens focusing assembly further comprises a second lens mount for a second lens group of the lens, and the second lens mount is slidably connected to the housing along the first direction and arranged opposite to the first lens mount in the first direction.

[0022] Through such an arrangement, the second lens mount is arranged opposite to the first lens mount along the first direction, so that the distance between the first lens group and the second lens group can be adjusted to better realize the focusing or zooming function of the lens focusing assembly.

[0023] In some embodiments, each magnetic member is a magnetite or a magnet. In this way, the production material of the magnetic member is more common, and the production cost is low.

[0024] The embodiment of the present application further provides a camera module, which comprises a lens and the lens focusing assembly provided by any of the above embodiments, and the lens comprises a first lens group, and the first lens group is installed on the first lens mount of the lens focusing assembly. In the camera module of the present application, the lens focusing assembly provided by any of the above embodiments is used, so that the camera module can realize long-stroke focusing and zooming function while reducing the production cost.

[0025] In some embodiments, the camera module further comprises a front prism and an image sensor, the front prism is arranged in front of the first lens group along the light incident direction, and the image sensor is arranged behind the first lens group along the light incident direction.

[0026] The embodiment of the present application further provides an electronic device, which comprises a shell and the camera module provided by any of the above embodiments, and the camera module is installed on the shell. In the electronic device of the present application, the camera module provided by any of the above embodiments is used, so that the electronic device can realize long-stroke focusing and zooming function, the imaging effect is better when shooting a far scene, and the manufacturing cost is lower. BRIEF DESCRIPTION OF DRAWINGS

[0027] FIG. 1a is a schematic view of the arrangement of the displacement detection device in the first lens focusing assembly;

[0028] FIG. 1b is a schematic view of the magnetic field distribution of the magnetic detection assembly in the first lens focusing assembly;

[0029] FIG. 1c is a schematic view of the magnetic field distribution of the magnetic detection assembly in the first lens focusing assembly, wherein the size of the magnetic member in the first direction is larger;

[0030] FIG. 1d is a schematic view of the arrangement of the displacement detection device in the second lens focusing assembly;

[0031] FIG. 1e is a schematic view of the arrangement of the displacement detection device in the third lens focusing assembly;

[0032] FIG. 1f is a schematic view of the effective detection stroke of the displacement detection device in the second lens focusing assembly;

[0033] FIG. 2 is a stroke-magnetic field strength change curve of different displacement detection devices in the lens focusing assembly;

[0034] FIG. 3a is a schematic view of the structure of the front view of the electronic device according to the embodiment of the present application;

[0035] FIG. 3b is a schematic view of the exploded structure of FIG. 3a;

[0036] FIG. 3c is a schematic view of the A-A direction of FIG. 3a;

[0037] FIG. 4 is a schematic view of the structure of the back view of the electronic device according to the embodiment of the present application;

[0038] FIG. 5 is a schematic diagram of an exemplary structure of a camera module according to an embodiment of the present application;

[0039] FIG. 6 is a schematic diagram of a control principle of an electronic device according to an embodiment of the present application;

[0040] FIGS. 7 to 15a are schematic diagrams of other exemplary structures of a camera module according to an embodiment of the present application;

[0041] FIG. 15b is a schematic diagram of a lens focusing assembly according to an embodiment of the present application;

[0042] FIG. 16 is a schematic diagram of a control principle of a camera module according to an embodiment of the present application;

[0043] FIG. 17a is a schematic diagram of a magnetic field distribution of a magnetic detection assembly in a lens focusing assembly according to an embodiment of the present application;

[0044] FIG. 17b is a schematic diagram of an arrangement of a displacement detection device in a lens focusing assembly according to an embodiment of the present application, wherein the magnetic pole of the second magnet close to the first magnet is N pole;

[0045] FIG. 17c is a schematic diagram of another arrangement of a displacement detection device in a lens focusing assembly according to an embodiment of the present application, wherein the magnetic pole of the second magnet close to the first magnet is S pole;

[0046] FIG. 18 is a schematic diagram of another arrangement of a displacement detection device in a lens focusing assembly according to an embodiment of the present application, wherein each magnetic member in the magnetic detection assembly is composed of a plurality of sub magnetic members;

[0047] FIG. 19 is a schematic diagram of a magnetic field distribution of another magnetic detection assembly in a lens focusing assembly according to an embodiment of the present application;

[0048] FIG. 20 is a stroke-magnetic field strength change curve when the second magnet has different lengths in a lens focusing assembly according to an embodiment of the present application;

[0049] FIG. 21 is a schematic diagram of another arrangement of a magnetic detection assembly in a lens focusing assembly according to an embodiment of the present application;

[0050] FIG. 22 is a schematic diagram of an arrangement of a displacement detection device in a lens focusing assembly according to an embodiment of the present application, wherein the lens focusing assembly includes two displacement detection devices;

[0051] FIG. 23 is a schematic diagram of an arrangement of a displacement detection device in a lens focusing assembly according to an embodiment of the present application, wherein the displacement detection device is offset in the second direction;

[0052] FIG. 24 is a stroke-magnetic field strength change curve when the displacement detection device is offset in the second direction in a lens focusing assembly according to an embodiment of the present application;

[0053] Figure 25 is a modified curve of stroke-magnetic field intensity when the displacement detection device in the lens focusing assembly of the embodiment of the application is offset in the second direction;

[0054] Figure 26a is a schematic diagram of the arrangement of the displacement detection device in the lens focusing assembly of the embodiment of the application, wherein one detection magnetic assembly is multiplexed as a driving magnetic assembly, and the other detection magnetic assembly is not multiplexed as a driving magnetic assembly;

[0055] Figure 26b is a schematic diagram of the arrangement of the displacement detection device in the lens focusing assembly of the embodiment of the application, wherein only part of the driving magnetic assembly is multiplexed from the detection magnetic assembly;

[0056] Figure 27 is a schematic diagram of the perspective structure of one exemplary structure of the lens focusing assembly of the embodiment of the application;

[0057] Figure 28 is a schematic diagram of the perspective structure of the lens focusing assembly of the embodiment of the application, wherein the upper shell of the lens focusing assembly is not shown;

[0058] Figure 29 is a schematic diagram of the perspective structure of the lens focusing assembly of the embodiment of the application, wherein the shell of the lens focusing assembly is not shown;

[0059] Figure 30 is a schematic diagram of the exploded structure of another lens focusing assembly of the embodiment of the application, wherein the shell of the lens focusing assembly is not shown;

[0060] Figure 31 is a schematic diagram of the B-B direction of Figure 29, wherein the guide rail is not shown;

[0061] Figure 32 is a schematic diagram of the cross-sectional structure when the magnetic pieces of the detection magnetic assembly in the lens focusing assembly of the embodiment of the application are arranged at intervals, wherein the shell of the lens focusing assembly is not shown;

[0062] Figure 33 is a schematic diagram of the perspective structure of another lens focusing assembly of the embodiment of the application, wherein the upper shell of the lens focusing assembly is not shown;

[0063] Figure 34 is a schematic diagram of the perspective structure of another lens focusing assembly of the embodiment of the application, wherein the shell of the lens focusing assembly is not shown;

[0064] Figure 35 is a schematic diagram of the perspective structure of another lens focusing assembly of the embodiment of the application, wherein the shell of the lens focusing assembly, the coil, and other structures are not shown.

[0065] Explanation of reference signs:

[0066] Some schemes: 2', lens focusing assembly; 4', displacement detection device; 41', magnetic sensor; 42', magnetic assembly; 43', magnetic piece; 9', moving piece; X', first direction.

[0067] The application: 100, electronic device; 101, display screen; 102, shell; 103, back cover; 104, middle frame; 105, bottom plate; 106, outer frame; 108, mainboard; 109, processor; 1, camera module; 11, controller; 12, rear prism; 13, front prism; 14, image sensor; 15, lens; 16, first lens group; 17, second lens group; 18, other lens group; 2, lens focusing assembly; 21, magnetic separation sheet; 22, circuit board; 23, non-magnetic component; 3, housing; 31, upper shell; 32, lower shell; 33, third groove; 4, displacement detection device; 41, magnetic sensor; 42, detection magnetic assembly; 43, first magnetic component; 44, second magnetic component; 45, third magnetic component; 5, driving device; 51, coil; 52, driving magnetic assembly; 6, first lens mount; 61, first groove; 62, mounting hole; 63, second groove; 7, second lens mount; 8, guiding device; 81, guide rail; 82, ball bearing; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0068] The following will illustrate the embodiments of the present application by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. Although the description of the present application will be introduced in combination with some examples, it does not mean that the features of the present application are limited to the implementation. On the contrary, the purpose of introducing the application in combination with the implementation is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the examples and features in the examples in the present application can be combined with each other without conflict.

[0069] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0070] In the description of the application, it should be pointed out that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the 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 application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0071] In the description of the application, it should be pointed out that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0072] In the description of the application, it should be understood that "electrical connection" in the application can be understood as physical contact and electrical conduction of components; it can also be understood as the form of connection between different components in the circuit structure through the entity line of printed circuit board (PCB) copper foil or wire which can transmit electrical signal.

[0073] In the description of the application, it should be pointed out that the mutual perpendicularity in the application is not absolute perpendicularity, and the approximate perpendicularity (for example, the included angle between two structural features is 89.9°) caused by processing error and assembly error is also within the range of mutual perpendicularity in the application. The mutual parallelism in the application is also not absolute parallelism, and the approximate parallelism (for example, the included angle between two structural features is 0.1°) caused by processing error and assembly error is also within the range of mutual parallelism in the application. The application does not make specific limitation on this.

[0074] In order to make the purpose, technical scheme and advantages of the application more clear, the embodiments of the application will be further described in detail below with reference to the drawings.

[0075] Please refer to FIG. 1a to FIG. 2, FIG. 1a is a schematic diagram of the arrangement of displacement detection device in the first lens focusing assembly; FIG. 1b is a schematic diagram of the magnetic field distribution of the detection magnetic assembly in the first lens focusing assembly; FIG. 1c is a schematic diagram of the magnetic field distribution of the detection magnetic assembly in the first lens focusing assembly, wherein the size of the magnetic component in the first direction is larger; FIG. 1d is a schematic diagram of the arrangement of displacement detection device in the second lens focusing assembly; FIG. 1e is a schematic diagram of the arrangement of displacement detection device in the third lens focusing assembly; FIG. 1f is a schematic diagram of the effective detection stroke of displacement detection device in the second lens focusing assembly; FIG. 2 is a stroke-magnetic field intensity change curve of different displacement detection devices in the lens focusing assembly.

[0076] With the increasingly rapid technical updates of electronic devices, users have increasingly high requirements for the imaging quality of camera modules. In order to improve the imaging quality of camera modules, more and more camera modules of electronic devices begin to be equipped with anti-shake and automatic zoom functions. In order to compensate for the influence of shaking and realize the automatic zoom function, a sensor with long stroke and high precision position detection function is needed for position feedback.

[0077] In the prior art, as shown in FIGS. 1a and 1b, the displacement detection device 4' of the lens focusing assembly 2' in the camera module usually realizes position detection through the cooperation between the magnetic sensor 41' and the magnetic assembly 42'. The magnetic assembly 42' includes two magnetic pieces 43' which are fixedly arranged on the moving piece 9' (i.e., a lens mount for mounting a lens lens group, also referred to as a mover) of the lens focusing assembly 2' along a first direction X' (the first direction X' is the optical axis direction) and have opposite magnetic pole directions on the same side, and the magnetic sensor 41' is fixedly arranged on the fixed piece (i.e., a housing, also referred to as a stator, not shown in the figure) of the lens focusing assembly 2' and is arranged correspondingly with the magnetic assembly 42'. The magnetic field strength around the magnetic assembly 42' is different, and when the magnetic assembly 42' moves along the first direction X' relative to the fixed piece with the moving piece 9' of the lens focusing assembly 2', the relative position of the magnetic sensor 41' and the magnetic assembly 42' changes, the magnetic field strength detected by the magnetic sensor 41' changes, and a controller (for example, which can be a chip) determines the real-time position of the moving piece 9' according to the change of the received magnetic field strength, so as to control the driving device 5' of the lens focusing assembly 2' to drive the moving piece 9' to move to the target position. However, during the movement of the moving piece 9', the magnetic field strength detected by the magnetic sensor 41' is different when the moving piece 9' moves to each position, so that the current position of the moving piece 9' can be accurately determined. The magnetic field strength around the joint of the two magnetic pieces 43' (along the first direction X') is different, and the distance between the positions corresponding to the peaks of the magnetic field strength when the magnetic sensor 41' translates along the first direction X' relative to the magnetic assembly 42' is the distance between the positions corresponding to the peaks of the magnetic field strength. When the magnetic sensor 41' moves to a position farther away from the joint of the two magnetic pieces 43' along the first direction X', the change curve of the displacement-magnetic field strength gradually flattens, and the magnetic field strength at multiple positions is equal, which affects the detection position of the magnetic sensor 41'. Therefore, the effective detection stroke of the magnetic sensor 41' can be understood as the distance between the positions corresponding to the peaks of the magnetic field strength around the joint of the two magnetic pieces 43'.

[0078] In one embodiment, as shown in FIGS. 1a and 1b, the displacement detection device 4' of the lens focusing assembly 2' uses one sensor plus two magnetic pieces 43' to detect the position, but the distance between the positions corresponding to the peaks of the magnetic field strength around the joint of the two magnetic pieces 43' in this way is within 1 mm, that is, the effective detection stroke of the magnetic sensor 41' is within 1 mm (as shown in the curve S1 in FIG. 2), and the effective detection stroke is short.

[0079] It should be noted that, as shown in Figure 1c, the size of the magnetic part 43' in the first direction X' has no obvious effect on the distance between the positions corresponding to the peak values ​​of the magnetic field intensity (or it can be understood as the effective detection range of the magnetic sensor 41'). Increasing the size of the magnetic part 43' will only increase the flat area of ​​the displacement-magnetic field intensity curve, and will not increase the effective detection range of the magnetic sensor 41'.

[0080] In another embodiment, as shown in Figures 1d and 1e, the displacement detection device 4' of the lens focusing assembly 2' uses two or three magnetic sensors 41' plus two magnetic parts 43' to perform position detection. The effective detection stroke of each sensor is calculated after appropriate comprehensive calculation to obtain a total effective detection stroke. Although the total effective detection stroke is improved compared to the case of a single magnetic sensor 41', it is up to 2mm (as shown by curves S2 to S5 in Figure 2) and cannot be further improved. However, multiple sensors will increase the cost of the lens focusing assembly 2' and require more magnetic field signal collection channels, which increases the operating burden of the controller, requires high technical capabilities of the controller, and has limited applicability.

[0081] It should be noted that the calculation method for the effective detection range of a multi-sensor solution using two magnetic sensors plus two magnetic components 43' is used as an example. As shown in Figure 1f, the sum of the distances (X2) between the leftmost magnetic field intensity peak detected by the left magnetic sensor and the rightmost magnetic field intensity peak detected by the right magnetic sensor represents the effective detection range of the two magnetic sensors plus two magnetic components 43' solution. This is an increase compared to the effective detection range (X1) of the single-sensor solution.

[0082] Furthermore, as shown in FIG2 , the displacement-magnetic field strength curve of one of the two magnetic sensors 41′ is shown in S2, and the displacement-magnetic field strength curve of the other magnetic sensor 41′ is shown in S3. Analysis of the displacement-magnetic field strength curves S2 and S3 shows that the effective detection range of both magnetic sensors 41′ is less than 1 mm. The displacement-magnetic field strength curve of the two magnetic sensors plus two magnetic components 43′ is shown in S4, and the displacement-magnetic field strength curve of the three magnetic sensors plus two magnetic components 43′ is shown in S5. As can be seen from curves S4 and S5 in FIG2 , the effective detection range of the two or three magnetic sensors plus two magnetic components 43′ method can reach up to 2 mm.

[0083] Based on this, the application provides a lens focusing assembly. The displacement detection device in the lens focusing assembly only needs to use one magnetic sensor and three magnetic pieces to detect the position. By setting the magnetic pole polarity distribution of the three magnetic pieces in the detection magnetic assembly, when the magnetic sensor translates relative to the detection magnetic assembly, the positions of the corresponding magnetic field strength peaks are farther away from the second magnetic piece located in the middle position (or can be understood as increasing the distance between the positions corresponding to the magnetic field strength peaks), thereby effectively increasing the effective detection stroke of the displacement detection device. Only one magnetic sensor is used, which reduces the cost of the lens focusing assembly, has low technical ability requirements for the controller, and has wider applicability. Thus, the problems of the small effective detection stroke of the displacement detection device of the lens focusing assembly in the prior art, and the high detection cost and high technical ability requirements for the controller and the limited applicability of the scheme using multiple sensors are solved.

[0084] The application also provides an electronic device applying the above lens focusing assembly. It should be noted that the electronic device is a type of electronic device configured with a camera, and specifically includes but is not limited to a display, a notebook computer, a tablet personal computer, a personal digital assistant (PDA), a personal computer (PC), a smart phone, a smart wearable device, a vehicle-mounted device, which does not limit the protection scope of the application. For the convenience of description, the electronic device is taken as a mobile phone in the following description.

[0085] Please refer to FIGS. 3a to 4, FIG. 3a is a structural schematic diagram of the front view of the electronic device of the embodiment of the application; FIG. 3b is an exploded structural schematic diagram of FIG. 3a; FIG. 3c is a sectional view schematic diagram of the A-A direction in FIG. 3a; and FIG. 4 is a three-dimensional structural schematic diagram of the back view of the electronic device of the embodiment of the application.

[0086] As shown in FIGS. 3a to 3c, the electronic device 100 includes a housing 102, a camera module 1, a display screen 101 and a circuit board (not shown in the figure) mounted on the housing 102. The housing 102 plays a role of protecting the electronic device 100 and supporting the whole machine, and has an accommodation space formed therein for accommodating the components of the electronic device 100. The display screen 101 and the circuit board are arranged in the accommodation space of the housing 102 and connected with the housing 102. The camera module 1 is mounted in the housing 102. The camera module 1 can realize long-stroke focusing and zooming functions, and has better imaging effect when shooting distant pictures, and lower manufacturing cost.

[0087] It can be understood by those skilled in the art that the specific structure of the shell 102 is not limited. In an embodiment, the shell 102 includes a middle frame 104 and a back cover 103, the middle frame 104 includes a bottom plate 105 and an outer frame 106 arranged around and connected to the outer circumferential side of the bottom plate 105, and the display screen 101 and the back cover 103 are respectively mounted at both ends of the outer frame 106 in the thickness direction of the electronic device 100, so that the display screen 101 and the back cover 103 are respectively located on both sides of the bottom plate 105. An installation cavity is formed between the back cover 103 and the bottom plate 105 for installing internal components such as a battery, a circuit board, a camera, an antenna, etc. In an embodiment, the circuit board is installed in the installation cavity between the back cover 103 and the bottom plate 105.

[0088] It can be understood by those skilled in the art that the bottom plate 105 is a support frame located inside the electronic device 100. The outer frame 106 is a structure surrounding the periphery of the electronic device 100. Referring to FIG. 3c, the outer frame 106 can extend around the periphery of the electronic device 100 and the display screen 101, and specifically can surround four sides of the display screen 101 to help fix the display screen 101. In some embodiments, the outer frame 106 can be a metal frame made of a metal material such as copper, magnesium alloy, stainless steel, etc. In other embodiments, the outer frame 106 can also be a non-metal frame (i.e. an insulating frame) including a plastic frame, a glass frame, a ceramic frame, etc., and can also be a structure combining a metal frame and a non-metal frame.

[0089] It should be noted that the bottom plate 105 and the outer frame 106 can be a split structure or an integral structure, which is not limited by the embodiments of the present application. When the bottom plate 105 and the outer frame 106 are a split structure, the bottom plate 105 and the outer frame 106 are two different components of the shell 102, which can be assembled together by clamping, buckling, etc., and can be separated when disassembled. When the bottom plate 105 and the outer frame 106 are an integral structure, the connection relationship between the bottom plate 105 and the outer frame 106 cannot be separated, for example, the bottom plate 105 and the outer frame 106 are processed by one-piece forming, or are assembled by permanent connection such as welding, etc.

[0090] The back cover 103 is a structure arranged opposite to the display screen 101 on the electronic device 100, used to seal the components of the electronic device 100 inside the electronic device 100, and can also prevent dust, prevent collision, and prevent hardware scratches. The back cover 103 can be a back cover made of metal material (i.e., a metal back cover), or a back cover made of non-conductive material (i.e., a non-metal back cover), such as a glass back cover, a plastic back cover, etc. In some embodiments, the electronic device 100 can also not include a separately arranged back cover 103, but use the bottom plate 105 of the middle frame 104 as the back cover 103, which is not limited in the present application. The above is a detailed introduction to the shell 102 of the electronic device 100, and the following will continue to describe other components.

[0091] The circuit board, as a carrier for electrical connection of electronic components, can be the main board 108 of the electronic device 100, or a sub-board (for example, a sub-board of a folding screen mobile phone). In an embodiment, the circuit board is the main board 108 of the electronic device 100. The size of the circuit board and its position in the electronic device 100 are not limited, and the figure is only schematic and does not limit the scope of the embodiments of the present application. The circuit board includes a plurality of functional modules (not shown in the figure) connected thereto to realize corresponding functions, such as a charging management module, a power management module, a wireless communication module, an audio module, etc., which are not limited in the present application.

[0092] In an embodiment, the electronic device 100 further includes a processor 109 (not shown in the figure). The processor 109 can realize functions such as running an operating system, processing various data, running application programs, and controlling a plurality of hardware connected to the processor 109.

[0093] Further, the display screen 101 of the electronic device 100 is used to display images, and the specific type thereof is not limited, and can be, but is not limited to, an organic light-emitting diode (OLED) display screen 101, an active-matrix organic light-emitting diode (AMOLED) display screen, a mini organic light-emitting diode display screen, a micro organic light-emitting diode display screen, a micro organic light-emitting diode display screen, or a quantum dot light emitting diode (QLED) display screen, etc., and the present application does not make any limitation thereon. The user can interact with the electronic device 100 through the display screen 101, and use the camera to take pictures, etc.

[0094] It should be noted that the camera module 1 can be installed at any position in the electronic device 100 according to requirements. For example, it can be installed on the front, back or side of the electronic device 100. In the present application, the side where the display screen 101 of the electronic device 100 is located is defined as the front of the electronic device 100, the side where the back cover 103 of the electronic device 100 is located is defined as the back of the electronic device 100, and the side connecting the front and back of the electronic device 100 is defined as the side of the electronic device 100. In one embodiment, as shown in FIG. 4, the camera module 1 is arranged on the back of the electronic device 100.

[0095] The above is the introduction of the structure of the electronic device 100 and the functions of each component thereof, and the system composition and structural composition of the camera module 1 will be described below.

[0096] Please refer to FIGS. 5 to 15a, FIG. 5 is a schematic diagram of an exemplary structure of the camera module according to the present application; FIG. 6 is a schematic diagram of the control principle of the electronic device according to the present application; and FIGS. 7 to 15a are schematic diagrams of other exemplary structures of the camera module according to the present application.

[0097] As shown in FIG. 5, the camera module 1 comprises a lens focusing assembly 2, a lens 15 and an image sensor 14. The lens 15 comprises a first lens group 16, which is mounted on a first lens mount 6 of the lens focusing assembly 2. The first lens group 16 comprises at least one lens (which can be one or more, and the present application does not limit this), and the lens can be a lens. It should be noted that the lens group (for example, the first lens group 16 and the second lens group 17 mentioned below) mounted in the lens focusing assembly 2 can be understood as an autofocus lens group.

[0098] The image sensor 14 is arranged behind the first lens group 16 along the light incident direction. The lens 15 can project the light emitted by the external light source onto the image sensor 14, and the image sensor 14 can form an image by processing the received light. In order to realize the auto-zoom function of the camera module 1, the lens 15 or the image sensor 14 can be moved. Therefore, the lens 15 can be used as a moving part, or the image sensor 14 can be used as a moving part. For example, the lens 15 is used as a moving part.

[0099] Further, as shown in FIG. 6, the processor 109 on the mainboard 108 is in communication connection with the camera module 1, and the camera module 1 can obtain the light signal in the external environment, and convert the light signal into an electrical signal, and then process the electrical signal to generate image information and send the image information to the processor 109 on the mainboard 108. At this time, the processor 109 can further process the image information transmitted by the camera module 1, and store or transmit the processed image information to the display screen 101 for display. Thus, the electronic device 100 can meet the user's needs for video calls, recording, shooting, etc.

[0100] Among them, the camera module 1 can comprise a controller 11, the controller 11 comprising an image processor (Image Signal Processor, ISP), when the camera module 1 works, the lens 15 of the camera module 1 images the picture to the surface of the image sensor 14, and the effective photosensitive area of the image sensor converts the light signal of the picture into an electrical signal and transmits it to the image processor, at this time, the image processor generates picture information (i.e. external environment information), so as to transmit the picture information to the processor 109 of the electronic device 100. Moreover, the controller 11 can control the lens focusing assembly 2 to realize the autofocus function, which will be described in detail below.

[0101] As shown in FIG. 7, the camera module 1 can further comprise a front prism 13, which is arranged in front of the first lens group 16 along the light incident direction. It can be understood that the front prism 13 is arranged in front of the lens focusing assembly 2 along the light incident direction.

[0102] As shown in FIG. 7, FIG. 12 to FIG. 15a, the camera module 1 can further comprise a rear prism 12, which is arranged behind the first lens group 16 in the light incident direction. It can be understood that the rear prism 12 is arranged behind the lens focusing assembly 2 in the light incident direction. And in the light incident direction, the rear prism 12 is located between the lens focusing assembly 2 and the image sensor 14. It should be noted that the front prism 13 and the rear prism 12 can both change the direction of light transmission.

[0103] It should be noted that in the camera module 1, in addition to the lens groups (for example, the first lens group 16 and the second lens group 17 mentioned below) mounted in the lens focusing assembly 2, other lens groups 18 (as shown in FIG. 7, FIG. 9 to FIG. 14, which can be understood as fixed lens groups) can be additionally provided, or no other lens groups can be additionally provided (as shown in FIG. 8, FIG. 15a), which can be designed according to design requirements.

[0104] Further, the number of the other lens groups 18 additionally provided in the camera module 1 is not limited, which can be one group (as shown in FIG. 7, FIG. 9, FIG. 10, FIG. 13 and FIG. 14) or multiple groups (as shown in FIG. 11 and FIG. 12). And the setting position of the other lens groups 18 is not limited. For example, as shown in FIG. 7, FIG. 9, FIG. 11, the other lens groups 18 can be arranged between the lens focusing assembly 2 and the image sensor 14, as shown in FIG. 10 to FIG. 13, the other lens groups 18 can be arranged between the front prism 13 and the lens focusing assembly 2, as shown in FIG. 12, FIG. 14, the other lens groups 18 can be arranged between the rear prism 12 and the lens focusing assembly 2. The actual requirements can be designed.

[0105] As shown in FIG. 7 to FIG. 15a, the image sensor 14 can be arranged in sequence along the first direction X with the lens focusing assembly 2, or can be arranged side by side along the second direction Y with the lens focusing assembly 2. Wherein, the second direction Y is perpendicular to the first direction X.

[0106] It should be noted that as shown in FIG. 12 to FIG. 15a, when the image sensor 14 is arranged side by side along the second direction Y with the lens focusing assembly 2, the light incident direction is the first direction X, and an additional front prism 13 needs to be provided in the camera module 1 to change the direction of light propagation, so that the light can propagate into the image sensor 14.

[0107] The system composition and structural composition of the camera module 1 are described in detail above in combination with the drawings, and the displacement detection method of the lens focusing assembly 2 is described in detail below in combination with the drawings.

[0108] Please refer to Figures 15b to 21. Figure 15b is a schematic diagram of the principle of the lens focusing assembly of the embodiment of the present application; Figure 16 is a schematic diagram of the control principle of the camera module of the embodiment of the present application; Figure 17a is a schematic diagram of the magnetic field distribution of the detection magnetic component in the lens focusing assembly of the embodiment of the present application; Figure 17b is a schematic diagram of an arrangement of the displacement detection device in the lens focusing assembly of the embodiment of the present application, wherein the magnetic pole of the second magnet close to the direction of the first magnet is the N pole; Figure 17c is a schematic diagram of another arrangement of the displacement detection device in the lens focusing assembly of the embodiment of the present application, wherein the magnetic pole of the second magnet close to the direction of the first magnet is the S pole; Figure 18 is a schematic diagram of another arrangement of the displacement detection device in the lens focusing assembly of the embodiment of the present application, wherein each magnetic component in the detection magnetic component is composed of a plurality of sub-magnetic components; Figure 19 is a schematic diagram of the magnetic field distribution of another detection magnetic component in the lens focusing assembly of the embodiment of the present application; Figure 20 is a stroke-magnetic field intensity change curve when the second magnet in the lens focusing assembly of the embodiment of the present application is of different lengths; Figure 21 is a schematic diagram of another arrangement of the detection magnetic component in the lens focusing assembly of the embodiment of the present application.

[0109] As shown in Figure 15b , the lens focusing assembly 2 includes a first lens mount 6, a housing 3, and a drive device 5. The first lens group 16 of the lens 15 is fixedly mounted on the first lens mount 6. The first lens mount 6 is slidably connected to the housing 3 along a first direction X (e.g., moving toward the left or right in the first direction X as shown in Figure 15b ). The first direction X is the optical axis direction of the first lens group 16. The drive device 5 is used to drive the first lens mount 6 to slide relative to the housing 3 along the first direction X.

[0110] It should be noted that the specific structure of the driving device 5 is not limited. In one embodiment, as shown in Figure 15b, the driving device 5 includes a driving magnetic component 52 and a coil 51. The driving magnetic component 52 is fixedly arranged on the first lens mount 6, and the coil 51 is fixedly arranged at a position of the housing 3 corresponding to the driving magnetic component 52. When current flows through the coil 51, the coil 51 generates magnetism. When the direction of the current changes, the polarity of the magnetism generated by the coil 51 is reversed. The interaction (attractive and repulsive forces) between the magnetic coil 51 and the driving magnetic component 52 generates a force that causes the first lens mount 6 to move left and right in the first direction X. It can be understood that the magnitude of the driving force can be adjusted according to the magnitude of the current in the coil 51, and thus the moving distance of the first lens mount 6 can be adjusted; the movement direction of the first lens mount 6 can be controlled by controlling the direction of the current in the coil 51.

[0111] As shown in FIG. 15b, the lens focusing assembly 2 further comprises a displacement detection device 4, which comprises a detection magnetic assembly 42 fixedly arranged on the first lens mount 6 and a magnetic sensor 41 fixedly arranged on the shell 3 at a position corresponding to the magnetic sensor 41. When the first lens mount 6 slides relative to the shell 3 in the first direction, the magnetic sensor 41 will also produce a translation in the first direction relative to the detection magnetic assembly 42, so that the magnetic field strength detected by the magnetic sensor 41 changes. It should be noted that the number of magnetic sensors 41 in the displacement detection device 4 is not limited and can be one or more (for example, the number of magnetic sensors 41 can be set to two, and the two magnetic sensors 41 can be arranged at intervals along the first direction X).

[0112] As shown in FIG. 16, the controller 11 of the camera module 1 is electrically connected with the position detection device and the driving device 5 in the lens focusing assembly 2, respectively. The magnetic sensor 41 in the displacement detection device 4 is used to transmit the collected magnetic field strength information to the controller 11, and then the controller 11 determines the current position of the first lens mount 6 according to all the received magnetic field strength information. When the magnetic field strength at the current position detected by the magnetic sensor 41 is equal to the magnetic field strength at the target position, it is known that the first lens mount 6 has moved to the target position. When the current magnetic field strength detected by the magnetic sensor 41 deviates from the magnetic field strength at the target position, the controller 11 will control the driving device 5 to drive the first lens mount 6 to move to the target position according to the deviation value between the current magnetic field strength detected by the magnetic sensor 41 and the magnetic field strength at the target position. Thus, the focusing or zooming effect of the camera module 1 is ensured.

[0113] Further, as shown in FIGS. 17a and 17b, the detection magnetic assembly 42 comprises a first magnetic piece 43, a second magnetic piece 44 and a third magnetic piece 45 arranged in sequence in the first direction X, the magnetic poles of each of the first magnetic piece 43 and the third magnetic piece 45 on the two sides along the second direction Y are opposite in polarity, the magnetic poles of the second magnetic piece 44 on the two sides along the first direction X are opposite in polarity, the magnetic pole of the side of the first magnetic piece 43 facing the shell 3 is the same as the magnetic pole of the side of the second magnetic piece 44 close to the first magnetic piece 43, and the magnetic pole of the side of the third magnetic piece 45 facing the shell 3 is the same as the magnetic pole of the side of the second magnetic piece 44 close to the third magnetic piece 45. The second direction Y is perpendicular to the first direction X. The second direction Y can be the width direction of the lens focusing assembly 2, or the height direction of the lens focusing assembly 2, which is not limited in the present application.

[0114] It should be noted that each stroke value of the first lens mount 6 in the first direction X needs to correspond to a unique magnetic field strength, so that the first lens mount 6 can move to the target position according to the preset trajectory, and better realize the lens automatic focusing function. The magnetic field strength between the positions corresponding to the magnetic field strength peaks is not the same (or can be understood as the magnetic field strength substantially linearly changes in this stroke range), and the effective detection stroke of the magnetic sensor 41 is the distance between the positions corresponding to the magnetic field strength peaks of the magnetic sensor 41.

[0115] As shown in FIG. 17a, when the distance between the first magnetic member 43 and the third magnetic member 45 is enlarged, and the second magnetic member 44 is inserted in the middle, the N pole of the second magnetic member 44 repels the N pole of the first magnetic member 43, causing the position of the left magnetic field strength peak (as shown in the straight line Q2 in FIG. 17a) to move away from the joint of the first magnetic member 43 and the second magnetic member 44. The S pole of the second magnetic member 44 repels the S pole of the third magnetic member 45, causing the position of the right magnetic field strength peak (as shown in the straight line Q3 in FIG. 17a) to move away from the joint of the second magnetic member 44 and the third magnetic member 45. Or can be understood as the distance between the positions corresponding to the left and right magnetic field strength peaks increases, and the effective detection stroke of the magnetic sensor 41 increases.

[0116] Moreover, when the magnetic sensor 41 moves relative to the detection magnetic assembly 42 in the first direction X, within the stroke range of the magnetic field strength peak, the farther the magnetic sensor 41 is from the middle region of the detection magnetic assembly 42 in the first direction X, the stronger the corresponding magnetic field strength. For example, the magnetic field strength at the intersection A of the motion trajectory Q1 of the magnetic sensor 41 relative to the detection magnetic assembly 42 and the magnetic field equipotential line is greater than the magnetic field strength at the intersection B of the motion trajectory Q1 of the magnetic sensor 41 relative to the detection magnetic assembly 42 and the magnetic field equipotential line, and the corresponding position at the intersection A is farther from the middle region of the detection magnetic assembly 42 in the first direction X than the corresponding position at the intersection B.

[0117] It should be noted that the magnetic pole of the second magnetic member 44 on the side close to the first magnetic member 43 in the first direction X can be an N pole or an S pole. It can be designed according to specific conditions. In an embodiment, as shown in FIG. 17b, the magnetic pole of the second magnetic member 44 on the side close to the first magnetic member 43 in the first direction X is an N pole, and the magnetic pole on the side close to the third magnetic member 45 is an S pole. The magnetic pole on the side of the first magnetic member 43 facing the shell 3 is an N pole, and the magnetic pole on the side away from the shell 3 is an S pole. The magnetic pole on the side of the third magnetic member 45 away from the shell 3 is an N pole, and the magnetic pole on the side close to the shell 3 is an S pole.

[0118] In another embodiment, as shown in FIG. 17c, the second magnetic member 44 has a S-pole on the side close to the first magnetic member 43 and a N-pole on the side close to the third magnetic member 45. The first magnetic member 43 has a S-pole on the side facing the housing 3 and a N-pole on the side away from the housing 3. The third magnetic member 45 has a S-pole on the side away from the housing 3 and a N-pole on the side close to the housing 3.

[0119] As shown in FIG. 17b, the displacement detection device 4 of the lens focusing assembly 2 adopts a magnetic sensor 41 plus three magnetic members mode to detect the position. Specifically, the first magnetic member 43 and the third magnetic member 45 each has opposite magnetic pole polarity on the two sides along the second direction Y, and the second magnetic member 44 has opposite magnetic pole polarity on the two sides along the first direction X (or can be understood as, the first magnetic member 43 and the third magnetic member 45 are magnetized along the second direction Y, the second magnetic member 44 is magnetized along the first direction X, and the magnetization direction of the second magnetic member 44 is perpendicular to the magnetization direction of the first magnetic member 43 and the third magnetic member 45). And, the polarity of the second magnetic member 44 close to the first magnetic member 43 and the third magnetic member 45 is the same as the magnetic pole polarity of the side of the first magnetic member 43 and the third magnetic member 45 facing the housing 3. The magnetic pole polarity distribution of the three magnetic members in the magnetic sensor 41 will make the position corresponding to the detected magnetic field strength peak of the magnetic sensor 41 relative to the detection magnetic assembly 42 translation along the first direction X more away from the second magnetic member 44 (or can be understood as, the distance between the positions corresponding to the detected magnetic field strength peak increases), greatly increasing the effective detection stroke of the magnetic sensor 41 (for example, the effective detection stroke can reach more than 2mm, even more than 6mm). And only one magnetic sensor 41 is used in the displacement detection device 4 of the embodiment, compared with the two or three sensor mode, effectively reducing the cost of the lens focusing assembly 2, and the technical ability requirement of the controller (for example, can be a chip) is low, and the applicability is wider.

[0120] Therefore, the lens focusing assembly 2 provided by the embodiment of the present application only needs to adopt a magnetic sensor 41 plus three magnetic members mode to detect the position, by setting the magnetic pole polarity distribution of the three magnetic members in the magnetic sensor 41, the position corresponding to the detected magnetic field strength peak of the magnetic sensor 41 relative to the detection magnetic assembly 42 translation is more away from the second magnetic member 44, thereby effectively increasing the effective detection stroke of the displacement detection device 4. And only one magnetic sensor 41 is used, which reduces the cost of the lens focusing assembly 2, and the technical ability requirement of the controller is low, and the applicability is wider. Thus, the problem of small effective detection stroke of the displacement detection device 4 of the lens focusing assembly 2 in the prior art, and the high detection cost of the multiple sensor solution, the high technical ability requirement of the controller, and the relatively limited applicability are solved.

[0121] As shown in FIG. 15b, the setting positions of the magnetic sensor 41 and the detection magnetic assembly 42 are not limited, as long as the magnetic sensor 41 and the detection magnetic assembly 42 are correspondingly arranged, i.e., the magnetic sensor 41 can detect the magnetic field intensity of the detection magnetic assembly 42 in the motion stroke range, and the magnetic field intensity value substantially linearly changes in the stroke range. For example, the magnetic sensor 41 can be arranged at the top of the shell 3 (the top in the height direction of the lens focusing assembly), and the detection magnetic assembly 42 is arranged at the top of the first lens mount 6 (the top in the height direction of the lens focusing assembly), or the magnetic sensor 41 can be arranged at the bottom of the shell 3 (the bottom in the height direction of the lens focusing assembly), and the detection magnetic assembly 42 is arranged at the bottom of the first lens mount 6 (the bottom in the height direction of the lens focusing assembly), in which case the second direction Y is the height direction of the lens focusing assembly 2; or the magnetic sensor 41 can be arranged at the side of the shell 3 (the side in the width direction of the lens focusing assembly), and the detection magnetic assembly 42 is arranged at the side of the first lens mount 6 (the side in the width direction of the lens focusing assembly), in which case the second direction Y is the width direction of the lens focusing assembly 2.

[0122] Further, the setting positions of the driving magnetic assembly 52 and the coil 51 are not limited, as long as the two can cooperate to drive the first lens mount 6 to move relative to the shell 3 according to a preset trajectory. For example, the driving magnetic assembly 52 can be arranged at the top, bottom or side of the first lens mount 6, and the coil 51 can be arranged at the top, bottom or side of the shell 3, and correspondingly arranged with the driving magnetic assembly 52 (for example, the driving magnetic assembly 52 is arranged at the top of the first lens mount 6, and the coil 51 is arranged at the top of the shell 3).

[0123] In addition, the driving magnetic assembly 52 and the detection magnetic assembly 42 can be independently arranged (for example, the driving magnetic assembly 52 is arranged at the side of the first lens mount 6, and the detection magnetic assembly 42 is arranged at the top of the first lens mount 6), or partially or wholly multiplexed, which is not limited in the present application. As shown in FIG. 15b, in one embodiment, the detection magnetic assembly 42 is multiplexed as the driving magnetic assembly 52, which reduces the volume of the lens focusing assembly 2, is conducive to the miniaturization of the electronic device 100, and is conducive to reducing the production cost of the lens focusing assembly 2.

[0124] The detection direction of the magnetic sensor 41 is not limited. For example, it can be an arbitrary angular direction perpendicular to the first direction X. As shown in FIG. 15b, in an embodiment, the detection direction of the magnetic sensor 41 is the second direction Y. In addition, other components that have no or negligible effect on the magnetic field can be arranged between the magnetic sensor 41 and the detection magnetic assembly 42, or no other components can be arranged therebetween. In an embodiment, no other components are arranged between the magnetic sensor 41 and the detection magnetic assembly 42.

[0125] Further, the distance between the magnetic sensor 41 and the detection magnetic assembly 42 along the second direction Y is not limited. When the magnetic sensor 41 moves relative to the detection magnetic assembly 42 along the first direction X, the change in the magnetic field strength of the detection magnetic assembly 42 can be detected. In addition, the position of the magnetic sensor 41 along the first direction X is not limited. For example, it can be arranged at a position in the housing 3 corresponding to the middle position of the second magnetic member 44, or at a position in the housing 3 corresponding to the middle position of the first magnetic member 43, or at a position in the housing 3 corresponding to the joint of the second magnetic member 44 and the third magnetic member 45. In an embodiment, as shown in FIG. 15b, when the first lens mount 6 is located at a middle position in the stroke range relative to the housing 3 along the first direction X, the magnetic sensor 41 is located at a position in the housing corresponding to the middle position of the second magnetic member 44 along the first direction X.

[0126] The orthogonal projection of the magnetic sensor 41 along the second direction Y can completely overlap the detection magnetic assembly 42, partially overlap the detection magnetic assembly 42, or not overlap the detection magnetic assembly 42. The specific design can be determined according to requirements. As shown in FIG. 15b, in an embodiment, the orthogonal projection of the magnetic sensor 41 along the second direction Y can completely overlap the magnetic sensor 41.

[0127] It should be noted that each magnetic member in the detection magnetic assembly 42 can be composed of one or more sub-magnetic members. The number of sub-magnetic members in each magnetic member of the detection magnetic assembly 42 can be equal or not equal. In an embodiment, as shown in FIG. 17b, each magnetic member in the detection magnetic assembly 42 is an integrated magnetic member. Alternatively, each magnetic member can be composed of one sub-magnetic member. In another embodiment, as shown in FIG. 18, each magnetic member in the detection magnetic assembly 42 is composed of two sub-magnetic members. In yet another embodiment, the first magnetic member 43 and the second magnetic member 44 are each composed of two sub-magnetic members, and the third magnetic member 45 is composed of three sub-magnetic members.

[0128] As shown in FIG. 17a and FIG. 19, the distance between the positions corresponding to the magnetic field intensity peaks is greater than the size of the second magnetic member 44 in the first direction X, or in other words, the effective detection stroke of the displacement detection device 4 is greater than the size of the second magnetic member 44 in the first direction X, and the size of the second magnetic member 44 in the first direction X is increased, and the effective detection stroke of the displacement detection device 4 is correspondingly increased.

[0129] Specifically, as shown in FIG. 20, as the size of the second magnetic member 44 is increased, the distance between the positions corresponding to the magnetic field intensity peaks is increased, and the effective detection stroke of the displacement detection device 4 is increased. When the size of the second magnetic member 44 in the first direction X is 4.8 mm, the effective detection stroke of the displacement detection device 4 can reach ±2.8 mm (as shown in curve S10). If the size of the second magnetic member 44 is further increased, the effective detection stroke of the displacement detection device 4 can be further increased, and can reach ±3 mm or more. Or in other words, the effective detection stroke of the displacement detection device 4 can reach 6 mm or more. However, when the size of the second magnetic member 44 is greater than 5 mm (not shown in the figure), the distance between the positions corresponding to the magnetic field intensity peaks is not significantly increased. Therefore, the reasonable range of the size of the second magnetic member 44 in the first direction X can be 0.4 mm-5 mm. Within the limited space of the lens focusing assembly 2, the effective detection stroke of the displacement detection device 4 is effectively improved. Those skilled in the art can understand that the size of the second magnetic member 44 in the first direction X can also be set to be less than 0.4 mm or greater than 5 mm, which is not limited in the present application.

[0130] It should be noted that when the detection magnetic assembly 42 is multiplexed as the driving magnetic assembly 52, the Lorentz force generated by the cooperation of the detection magnetic assembly 42 and the coil 51 serves as the driving force for driving the first lens mount 6 to move, and the size of each magnetic member in the detection magnetic assembly 42 and the arrangement of the magnetic pole direction have a crucial influence on the size of the driving force. After meeting the design requirements of the effective detection stroke of the lens focusing assembly 2 and confirming the size of the second magnetic member 44 and the magnetic pole direction of each magnetic member, the sizes of the first magnetic member 43 and the third magnetic member 45 can be designed according to the required driving force size when the first lens mount 6 moves. And when the first lens mount 6 moves to the limit stroke, the magnetic sensor 41 should have a good magnetic field matching area with the coil 51, so that the generated Lorentz force is sufficient to drive the first lens mount 6 to return to the initial position.

[0131] The size of the first magnetic member 43 and the third magnetic member 45 in the first direction X can be equal or not equal. The actual requirement can be designed. In an embodiment, as shown in FIG. 21, the size of the first magnetic member 43 and the third magnetic member 45 in the first direction X is not equal. In another embodiment, as shown in FIG. 19, the size of the first magnetic member 43 and the third magnetic member 45 in the first direction X is equal. This makes the interchangeability of the first magnetic member 43 and the third magnetic member 45 better, which is convenient for the production and cost reduction of the lens focusing assembly 2.

[0132] It should be noted that, as shown in FIG. 15b, the magnetic pole arrangement of each magnetic member in the detection magnetic assembly 42 can not only increase the distance between the positions corresponding to the magnetic field strength peaks, but also increase the magnetic field strength near the side of the shell 3 and weaken the magnetic field strength away from the side of the shell 3. Therefore, when the detection magnetic assembly 42 is reused as the driving magnetic assembly 52, the size of the first magnetic member 43 and the third magnetic member 45 in the first direction X can be designed to be smaller under the condition of requiring the same driving force, thereby reducing the size of the lens focusing assembly 2, and further reducing the size of the camera module 1, so that the electronic device 100 is more compact.

[0133] Further, as shown in FIG. 15b, the material of each magnetic member in the detection magnetic assembly 42 is not limited. For example, it can be a magnet, a magnet, etc. The material of each magnetic member can be the same or different. In one example, each magnetic member is a magnet. In another example, each magnetic member is a magnet. In yet another example, the first magnetic member 43 and the third magnetic member 45 are magnets, and the second magnetic member 44 is a magnet. The production materials of the magnetic members are common and have low production cost.

[0134] The displacement detection method of the lens focusing assembly 2 is described in detail above in combination with the drawings. The correction method when the first lens mount 6 is offset is described in detail below in combination with the drawings.

[0135] Please refer to FIG. 22 to FIG. 26b, FIG. 22 is a schematic diagram of the arrangement of the displacement detection device in the lens focusing assembly according to the embodiment of the present application, wherein the lens focusing assembly comprises two displacement detection devices; FIG. 23 is a schematic diagram of the arrangement of the displacement detection device in the lens focusing assembly according to the embodiment of the present application, wherein the displacement detection device is offset along the second direction; FIG. 24 is a stroke-magnetic field intensity change curve when the displacement detection device in the lens focusing assembly according to the embodiment of the present application is offset along the second direction; FIG. 25 is a corrected stroke-magnetic field intensity curve when the displacement detection device in the lens focusing assembly according to the embodiment of the present application is offset along the second direction; FIG. 26a is a schematic diagram of the arrangement of the displacement detection device in the lens focusing assembly according to the embodiment of the present application, wherein one detection magnetic assembly is multiplexed as a driving magnetic assembly, and the other detection magnetic assembly is not multiplexed as a driving magnetic assembly; FIG. 26b is a schematic diagram of the arrangement of the displacement detection device in the lens focusing assembly according to the embodiment of the present application, wherein only part of the driving magnetic assembly is multiplexed from the detection magnetic assembly.

[0136] It should be noted that, as shown in FIG. 22 and FIG. 23, when the electronic device is affected by external factors, the first lens mount 6 in the lens focusing assembly 2 can be offset along the second direction Y. When the relative distance between the magnetic sensor 41 and the detection magnetic assembly 42 changes (for example, the relative distance between the magnetic sensor 41 and the detection magnetic assembly 42 changes from Y1 to Y2), the magnetic field intensity detected by the magnetic sensor 41 also changes. Specifically, as shown in FIG. 24, when the distance between the detection magnetic assembly 42 and the magnetic sensor 41 increases, the magnetic field intensity detected by the magnetic sensor 41 decreases (as shown in S13). When the distance between the first lens mount 6 and the magnetic sensor 41 decreases, the magnetic field intensity detected by the magnetic sensor 41 increases (as shown in S11). The error in the magnetic field intensity detected by the magnetic sensor 41 will further cause the detection accuracy of the displacement detection device 4 to decrease.

[0137] For example, when the relative distance between the magnetic sensor 41 and the detection magnetic assembly 42 increases, the magnetic field intensity detected by the magnetic sensor 41 decreases when the first lens mount 6 moves to the predetermined position, and the processor 109 adjusts the movement distance of the first lens mount 6 according to the current magnetic field intensity detected by the magnetic sensor 41, so that the magnetic field intensity detected by the magnetic sensor 41 is the same as the magnetic field intensity corresponding to the predetermined position. However, after such adjustment, there will be a deviation between the actual position of the first lens mount 6 and the predetermined position. Therefore, when the relative distance between the magnetic sensor 41 and the detection magnetic assembly 42 changes, an accuracy error will be caused, the magnetic field intensity detected by the magnetic sensor 41 is inaccurate, and the position detection accuracy is further reduced.

[0138] In one embodiment, as shown in FIG. 22, two displacement detection devices 4 are provided, and the two displacement detection devices 4 are respectively arranged between the two sides of the first lens mount 6 along the second direction Y and the corresponding sides of the housing 3 (see FIG. 15b). The two sides of the first lens mount 6 along the second direction Y are both provided with displacement detection devices 4. The adverse effects on the position detection accuracy when the first lens mount 6 is offset relative to the housing 3 along the second direction Y can be effectively avoided, thereby avoiding the adverse effects on the focusing / zooming effect of the lens focusing assembly 2.

[0139] As shown in FIG. 25, when the first lens mount 6 is offset along the second direction Y, so that the relative distance between each magnetic sensor 41 and the corresponding detection magnetic assembly 42 changes from Y1 to Y2. The magnetic field intensity detected by the magnetic sensor 41 on the upper side along the second direction Y decreases (as shown in S15), and the magnetic field intensity detected by the magnetic sensor 41 on the lower side along the second direction Y increases (as shown in S14). Since the interval between the two magnetic sensors 41 along the second direction Y remains unchanged, the increase in the magnetic field intensity detected by the lower magnetic sensor 41 after the offset is just equal to the decrease in the magnetic field intensity detected by the upper magnetic sensor 41 after the offset. Therefore, by performing corresponding operations on the magnetic field intensity detected by the upper magnetic sensor 41 and the magnetic field intensity detected by the lower magnetic sensor 41, it can be ensured that the magnetic field intensity values detected by the two magnetic sensors 41 (as shown in S16) are basically not affected by the change in the interval between the magnetic sensor 41 and the corresponding detection magnetic assembly 42 under the same stroke, which helps to reduce the accuracy error and improve the position detection accuracy.

[0140] Further, the arrangement of the two displacement detection devices 4 is not limited, and can be symmetrically arranged or asymmetrically arranged. In one example, as shown in FIG. 22, the two displacement detection devices 4 are symmetrically arranged. When the first lens mount 6 is offset relative to the housing 3 along the second direction Y, it is more convenient to perform fitting calculation on the sensing signals, thereby reducing the operation burden of the controller.

[0141] In addition, the structures of the detection magnetic assemblies 42 in the two displacement detection devices 4 can be the same or different. In one embodiment, as shown in FIG. 22, the structures of the detection magnetic assemblies 42 in the two displacement detection devices 4 are the same. In another embodiment, the first magnetic member 43 and the third magnetic member 45 of the detection magnetic assembly 42 in one displacement detection device 4 have the same size along the first direction X, and the first magnetic member 43 and the third magnetic member 45 of the detection magnetic assembly 42 in the other displacement detection device 4 have different sizes along the first direction X.

[0142] It should be noted that the type of the magnetic sensor 41 in the displacement detection device 4 is not limited, and can be a Hall sensor, an anisotropic magnetoresistance (AMR) sensor, a tunneling magnetoresistance (TMR) sensor, or the like. In addition, the types of the magnetic sensors 41 in the two displacement detection devices 4 can be the same or different. In one example, the magnetic sensors 41 in the two displacement detection devices 4 are both Hall sensors. Using the same type of magnetic sensor 41 in the displacement detection device 4 can help reduce the difficulty of adapting and assembling the displacement detection device 4, and can reduce the manufacturing cost.

[0143] It should be further noted that the detection magnetic components 42 in all displacement detection devices 4 can be partially reused as the driving magnetic components 52 (for example, as shown in FIG. 26a, one detection magnetic component 42 is reused as the driving magnetic component 52, and the other detection magnetic component 42 is not reused as the driving magnetic component), or all of the detection magnetic components 42 can be reused as the driving magnetic components 52 (for example, as shown in FIG. 22, the detection magnetic components 42 in the two displacement detection devices 4 are reused as the driving magnetic components 52 of the two driving devices, respectively).

[0144] In addition, the driving magnetic components 52 of all driving devices 5 can be all reused from the detection magnetic components 42 (as shown in FIG. 22), or can be only partially reused from the detection magnetic components 42 (as shown in FIG. 26b). In the case where only part of the driving magnetic components 52 of all driving devices 5 are reused from the detection magnetic components 42, the structure of the driving magnetic components 52 that are separately provided can adopt the structure of the detection magnetic components 42 described above (as shown in FIG. 26b), or can adopt other structures.

[0145] The above describes in detail the correction method when the first lens mount 6 is offset, and the following describes in detail the structure of the lens focusing assembly 2 in combination with an exemplary structure.

[0146] Please refer to FIG. 27 to FIG. 33, FIG. 27 is a perspective view of an exemplary structure of a lens focusing assembly according to an embodiment of the present application; FIG. 28 is a perspective view of the lens focusing assembly according to an embodiment of the present application, wherein the upper shell of the lens focusing assembly is not shown; FIG. 29 is a perspective view of the lens focusing assembly according to an embodiment of the present application, wherein the outer shell of the lens focusing assembly is not shown; FIG. 30 is an exploded view of another lens focusing assembly according to an embodiment of the present application, wherein the outer shell of the lens focusing assembly is not shown; FIG. 31 is a sectional view of FIG. 29 along the direction of B-B, wherein the guide rail is not shown; FIG. 32 is a sectional view of the lens focusing assembly according to an embodiment of the present application, wherein the magnetic components of the detection magnetic assembly are arranged at intervals, and the outer shell of the lens focusing assembly is not shown; FIG. 33 is a perspective view of another lens focusing assembly according to an embodiment of the present application, wherein the upper shell of the lens focusing assembly is not shown; FIG. 34 is a perspective view of another lens focusing assembly according to an embodiment of the present application, wherein the outer shell of the lens focusing assembly is not shown; FIG. 35 is a perspective view of another lens focusing assembly according to an embodiment of the present application, wherein the outer shell of the lens focusing assembly, the coil and other structures are not shown.

[0147] As shown in FIG. 27 to FIG. 28, the specific structure of the outer shell 3 is not limited. In one example, the outer shell 2 includes an upper shell 31 and a lower shell 32, and the upper shell 31 and the lower shell 32 are fixed by buckling each other. The first lens mount 6 is provided with a mounting hole 62, the mounting hole 62 penetrates the first lens mount 6 along the first direction X, the first end of the mounting hole 62 extends to the first end face of the first lens mount 6, and the second end of the mounting hole 62 extends to the second end face of the first lens mount 6. The first lens group 16 is installed in the mounting hole 62.

[0148] It should be noted that the shape of the outer shell 3 and the first lens mount 6 is not limited, which can be rectangular, circular or other shapes. In one example, as shown in FIG. 27 and FIG. 28, the outer shell 3 and the first lens mount 6 are both arranged in a rectangular shape. Among them, the length direction of the outer shell 3 and the first lens mount 6 can be understood as the first direction X, the width direction can be understood as the second direction Y, and the height direction is perpendicular to the first direction X and the second direction Y.

[0149] Among them, as shown in FIG. 29, the mounting mode of the detection magnetic assembly 42 and the first lens mount 6 is not limited, which can be directly mounted on the surface of the first lens mount 6, or embedded and mounted in the first groove 61 opened on the surface of the first lens mount 6. In one embodiment, the first groove 61 is opened on the side of the first lens mount 6 along the second direction Y, and the detection magnetic assembly 42 is embedded and mounted in the first groove 61 of the first lens mount 6.

[0150] As shown in FIG. 29, the lens focusing assembly 2 further comprises a magnetic isolation sheet 21. The magnetic isolation sheet 21 is arranged between the magnetic assembly (for example, the detection magnetic assembly 42 or the driving magnetic assembly 52) and the first lens mount 6 along the second direction Y. Specifically, one side of the magnetic isolation sheet 21 along the second direction Y is in contact with the bottom surface of the first groove 61, and the other side is in contact with the surface of the magnetic assembly close to the first lens mount 6. The magnetic isolation sheet 21 is used to isolate the magnetic field interference between the magnetic assembly arranged on the other side of the first lens mount 6, so as to ensure the detection accuracy of the displacement detection device and the displacement accuracy when the driving device drives the first lens mount 6 to move.

[0151] Further, as shown in FIG. 28 and FIG. 29, the lens focusing assembly further comprises a circuit board 22, and the type of the circuit board 22 is not limited, for example, it can be a flexible circuit board or a PCB board. For example, the circuit board 22 is a flexible circuit board. Further, the position of the circuit board 22 is not limited, and it can be fixedly connected with the upper shell or fixedly connected with the lower shell 32. In one example, the circuit board 22 is fixedly connected with the lower shell 32, and is used for electrical signal transmission of the lens focusing assembly, sending signals to the coil 51 to drive the first lens mount 6 to move along the first direction X, and performing electrical signal transmission with the magnetic sensor 41, so as to detect the position of the first lens mount 6.

[0152] It should be noted that the coil 51 and the magnetic sensor 41 are integrated on the circuit board 22, and are in communication connection with the controller 11 through the circuit board 22. Further, the circuit board 22 is fixedly connected with the lower shell 32, so that the coil 51 and the magnetic sensor 41 are fixed relative to the lower shell 32.

[0153] As shown in FIG. 28 and FIG. 29, the lens focusing assembly further comprises a guide device 8. The first lens mount 6 is in sliding connection with the housing along the first direction X through the guide device 8, and the specific structure of the guide device 8 is not limited. In one embodiment, as shown in FIG. 28 and FIG. 29, the guide device 8 comprises a guide rail 81 extending along the first direction X and fixedly connected with the housing. The first lens mount 6 is provided with a second groove 63 penetrating through along the first direction X on the bottom surface close to the guide rail 81, and the first lens mount 6 is in sliding connection with the housing through the cooperation of the second groove 63 and the guide rail 81.

[0154] Further, the number of guide devices 8 between the first lens mount 6 and the housing is not limited and can be one or more. For example, the first lens mount 6 and the housing are connected in sliding manner by two guide devices 8. The second groove 63 on the bottom surface of the first lens mount 6 is not limited in shape. For example, the second groove 63 can be arc-shaped, rectangular, V-shaped, trapezoidal, or the like. The second groove 63 on the bottom surface of the first lens mount 6 can be the same or different in shape. In one example, the bottom surface of the first lens mount 6 is provided with two second grooves 63, one of which is rectangular in shape and the other of which is trapezoidal in shape.

[0155] The material of the guide rail 81 is not limited and can be a non-magnetic material or a strong magnetic material. In one example, the guide rail 81 is made of a strong magnetic material. The guide rail 81 made of a strong magnetic material can be magnetically attracted and pre-pressed by the magnet assembly to prevent the first lens mount 6 from derailing.

[0156] In another embodiment, as shown in FIG. 30, the bottom surface of the first lens mount 6 is provided with a second groove 63, and the surface of the lower housing 32 close to the bottom surface of the first lens mount 6 is provided with a third groove 33 at a position corresponding to the second groove 63. The first lens mount 6 and the housing are connected in sliding manner along the first direction X by the ball 82 accommodated in the second groove 63 and the third groove 33.

[0157] As shown in FIGS. 31 and 32, the magnetic pieces of the detection magnetic assembly 42 (for example, the first magnetic piece 43 and the second magnetic piece 44, and the second magnetic piece 44 and the third magnetic piece 45) can be arranged in contact or spaced apart in the first direction X. In one embodiment, as shown in FIG. 31, the magnetic pieces of the detection magnetic assembly 42 (for example, the first magnetic piece 43 and the second magnetic piece 44, and the second magnetic piece 44 and the third magnetic piece 45) are arranged in contact in the first direction X. It should be noted that due to the current assembly process, the magnetic pieces of the detection magnetic assembly 42 arranged in contact in the first direction X have a certain gap. Of course, if the process can be realized, the magnetic pieces of the detection magnetic assembly 42 can be arranged in close contact without a gap in the first direction X, which is not limited in the present application.

[0158] In another embodiment, as shown in FIG. 32, the magnetic members of the detection magnetic assembly 42 are spaced apart in the first direction X (for example, between the first magnetic member 43 and the second magnetic member 44, and between the second magnetic member 44 and the third magnetic member 45). The space between the magnetic members can be filled with a non-magnetic gas (for example, air) or a non-magnetic component 23 (the non-magnetic component 23 does not attract the magnetic members, i.e., no magnetic attraction force is generated). The specific material of the non-magnetic component 23 is not limited and can be a non-magnetic metal or non-metal material. Those skilled in the art can select according to the specific circumstances. In one example, the non-magnetic component 23 can be made of a metal material such as aluminum or copper. In another example, the non-magnetic component 23 can be made of a non-metal material such as plastic. The spacing distance between the spaced magnetic members of the detection magnetic assembly 42 is not limited and can be designed by those skilled in the art according to the actual situation.

[0159] Further, the non-magnetic component 23 and the first lens mount 6 can be an integrated structure or a split structure. In one embodiment, as shown in FIG. 32, the non-magnetic component 23 and the first lens mount 6 are a split structure. In another embodiment, the non-magnetic component 23 and the first lens mount 6 are an integrated structure. Alternatively, the first lens mount 6 can include a plurality of sub-grooves, and the magnetic members of the detection magnetic assembly 42 are arranged in the corresponding sub-grooves, and the material of the first lens mount 6 is a non-magnetic material.

[0160] As shown in FIG. 33, the entire structure composed of the first lens mount 6 and other structural members fixed to the first lens mount 6 can be understood as a moving member which moves quantitatively along the first direction X to achieve focusing or zooming. It should be noted that the number of moving members in the lens focusing assembly is not limited. In addition to the above-mentioned moving member, other moving members (which can have the same structure as the above-mentioned moving member or a different structure) can be additionally provided, or no additional moving member can be provided. In one embodiment, as shown in FIG. 28, the lens focusing assembly 2 only includes the above-mentioned one moving member (i.e., the entire structure composed of the first lens mount 6 and other structural members fixed to the first lens mount 6).

[0161] In another embodiment, as shown in FIG. 34, two moving parts are provided in the lens focusing assembly 2. Specifically, the lens focusing assembly comprises a second lens mount 7 in addition to the integral structure comprising the first lens mount 6 and other structural members fixed to the first lens mount 6. The lens 15 further comprises a second lens group 17, which is mounted to the second lens mount 7. The second lens mount 7 is slidingly connected to the housing along the first direction X and is arranged opposite to the first lens mount 6 along the first direction X. The second lens mount 7 is arranged opposite to the first lens mount 6 along the first direction X, so that the focusing or zooming function of the lens focusing assembly can be better achieved by adjusting the distance between the first lens group 16 and the second lens group 17.

[0162] It should be noted that the displacement detection device 4 used to detect the position of the first lens mount 6 and the displacement detection device used to detect the position of the second lens mount 7 can be the same or different. In one embodiment, the displacement detection device 4 used to detect the position of the first lens mount 6 and the displacement detection device used to detect the position of the second lens mount 7 both adopt the manner of one magnetic sensor 41 plus three magnetic members to detect the position.

[0163] In another embodiment, as shown in FIG. 35, the displacement detection device 4 used to detect the position of the first lens mount 6 adopts the manner of one magnetic sensor 41 plus three magnetic members to detect the position, and the displacement detection device used to detect the position of the second lens mount 7 adopts the manner of one magnetic sensor plus two magnetic members to detect the position.

[0164] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A lens focusing assembly, characterized in that: include: A first lens mounting seat (6), the first lens mounting seat (6) being used to mount a first lens group (16) of a lens (15); A housing (3), wherein the first lens mounting seat (6) is slidably connected in a first direction (X) within the housing (3); A displacement detection device (4), the displacement detection device (4) comprising a detection magnetic component (42) and a magnetic sensor (41), the detection magnetic component (42) being fixedly disposed on the first lens mounting seat (6), and the magnetic sensor (41) being fixedly disposed on the housing (3) at a position corresponding to the detection magnetic component (42); The detection magnetic component (42) includes a first magnetic member (43), a second magnetic member (44) and a third magnetic member (45) arranged in sequence in the first direction (X), the magnetic pole polarities of each magnetic member in the first magnetic member (43) and the third magnetic member (45) on both sides along the second direction (Y) are opposite, the magnetic pole polarities of the second magnetic member (44) on both sides along the first direction (X) are opposite, the magnetic pole polarities of the first magnetic member (43) on the side facing the housing (3) are the same as the magnetic pole polarity of the second magnetic member (44) on the side close to the first magnetic member (43), and the magnetic pole polarity of the third magnetic member (45) on the side facing the housing (3) is the same as the magnetic pole polarity of the second magnetic member (44) on the side close to the third magnetic member (45); wherein the first direction (X) is the optical axis direction of the first lens group (16), and the second direction (Y) is perpendicular to the first direction (X).

2. The lens focusing assembly according to claim 1, wherein: There are two displacement detection devices (4), and the two displacement detection devices (4) are respectively arranged between two sides of the first lens mounting seat (6) along the second direction (Y) and corresponding sides of the housing (3).

3. The lens focusing assembly according to claim 2, wherein: The two displacement detection devices (4) are symmetrically arranged.

4. The lens focusing assembly according to claim 1, wherein: The lens focusing assembly (2) further includes a driving device (5), the driving device (5) being used to drive the first lens mounting seat (6) to slide along the first direction (X) relative to the housing (3), and including a driving magnetic assembly (52) and a coil (51), the driving magnetic assembly (52) being fixedly arranged on the first lens mounting seat (6), and the coil (51) being fixedly arranged on the housing (3) at a position corresponding to the driving magnetic assembly (52); and the detection magnetic assembly (42) being reused as the driving magnetic assembly (52).

5. The lens focusing assembly according to claim 1, wherein: The size of the second magnetic member (44) in the first direction (X) is 0.4 mm to 5 mm.

6. The lens focusing assembly according to claim 1, wherein: The first magnetic member (43) and the third magnetic member (45) have the same size in the first direction (X).

7. The lens focusing assembly according to claim 1, wherein: The detection direction of the magnetic sensor (41) is the second direction (Y).

8. The lens focusing assembly according to claim 1, wherein: The lens focusing assembly (2) further comprises a second lens (15) mounting seat, the second lens (15) mounting seat being used for a second lens group of the lens (15), the second lens (15) mounting seat being slidably connected to the housing (3) along the first direction (X), and being arranged opposite to the first lens mounting seat (6) in the first direction (X).

9. The lens focusing assembly according to any one of claims 1 to 8, wherein: Each of the magnetic parts is a magnet or a magnet.

10. A camera module, characterized in that: The invention comprises a lens (15) and a lens focusing assembly (2) according to any one of claims 1 to 9, wherein the lens (15) comprises a first lens group (16), and the first lens group (16) is mounted on the first lens mounting seat (6) of the lens focusing assembly (2).

11. The camera module according to claim 10, wherein: The camera module (1) further comprises a front prism (13) and an image sensor (14); the front prism (13) is arranged in front of the first lens group (16) along the light incident direction; and the image sensor (14) is arranged in the rear of the first lens group (16) along the light incident direction.

12. An electronic device, characterized in that: It comprises a housing (102) and a camera module (1) as claimed in claim 10 or 11, wherein the camera module (1) is mounted on the housing (102).

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