Voice coil motor, camera module and electronic equipment

Abstract

The invention provides a voice coil motor, a camera module and an electronic device. The voice coil motor comprises a base (110); the sliding rail assembly is arranged in the front-back direction; the movable seat (120) is used for bearing a first lens and is arranged on the base (110) in a sliding manner through the sliding rail assembly; the first electromagnetic driving assembly (130) and the second electromagnetic driving assembly (140) are used for providing driving force for the movable seat (120) so as to drive the movable seat (120) to slide in the front-back direction relative to the base (110); the first electromagnetic driving assembly (130) and the second electromagnetic driving assembly (140) are arranged on the two sides of the sliding rail assembly respectively. According to the voice coil motor, the structure of the voice coil motor is improved, so that the voice coil motor has a large stroke, and the use requirements of long-focus shooting and macro shooting can be met at the same time.

Description

[0001] This application is a divisional application. The application number of the original application is 202011275173.6, and the original application date is November 13, 2020. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of imaging technology, and more specifically, to a voice coil motor, a camera module and an electronic device. Background Art

[0003] In recent years, with the development of optical imaging technology, people have higher and higher requirements for the camera function of portable electronic devices. Not only do they require the camera modules equipped with electronic devices to be able to achieve functions such as background blur and clear night shooting, but they also require the camera modules equipped with electronic devices to be able to achieve telephoto shooting and macro shooting.

[0004] Currently, voice coil motors (VCM) are commonly used to focus camera modules. Since the focal length of telephoto shooting is short, the motor stroke required is small, so the current voice coil motor can meet the needs of telephoto shooting. However, macro shooting usually requires shooting the relevant objects at a close distance. The closer the working distance, the more motor stroke is occupied. The camera module with telephoto shooting function currently configured in mobile phones may have a short stroke of the voice coil motor, and the focusing distance may exceed the maximum stroke of the voice coil motor, making it difficult to focus during macro shooting, which in turn makes the macro shooting effect poor.

[0005] Based on this, providing a voice coil motor with a long stroke that can simultaneously meet the requirements of telephoto shooting and macro shooting has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The present application provides a voice coil motor, a camera module and an electronic device. By improving the structure of the voice coil motor, the voice coil motor has a larger stroke, which can meet the requirements of telephoto shooting and macro shooting at the same time.

[0007] In a first aspect, a voice coil motor is provided, comprising: a base; a slide rail assembly arranged along a front-to-rear direction; a movable seat for carrying a first lens and slidably arranged on the base through the slide rail assembly; a first electromagnetic drive assembly and a second electromagnetic drive assembly for providing a driving force to the movable seat to drive the movable seat to slide in the front-to-rear direction relative to the base; the first electromagnetic drive assembly and the second electromagnetic drive assembly are respectively arranged on both sides of the slide rail assembly.

[0008] According to the voice coil motor provided in the present application, the movable seat is slidably set on the base through a slide rail assembly, and can slide back and forth relative to the base, so that the movable seat has a larger movement range relative to the base, and thus the voice coil motor has a larger motor stroke, thereby being able to meet the use requirements of telephoto shooting and macro shooting at the same time, allowing the user to flexibly switch between the two working modes of telephoto shooting and macro shooting, thereby improving the user experience.

[0009] The voice coil motor provided in the present application includes a first electromagnetic drive assembly and a second electromagnetic drive assembly which are respectively arranged on opposite sides of the slide rail assembly. Both sides of the slide rail assembly can provide driving force to the movable seat at the same time. Compared with the unilateral output, it can avoid the movement inclination angle when the movable seat slides, thereby ensuring that the sliding of the movable seat is smoother. In addition, the position information of the movable seat collected by the displacement sensor is also more accurate, which can improve the accuracy of the closed-loop control of the voice coil motor, thereby improving the shooting effect of the camera module.

[0010] Optionally, the first electromagnetic drive component and the second electromagnetic drive component are symmetrically arranged relative to the slide rail component, thereby ensuring symmetry in the output on both sides and avoiding movement inclination angles caused by uneven output, thereby further improving the smoothness of the movement of the movable seat and further improving the shooting effect of the camera module.

[0011] For example, the first electromagnetic drive assembly and the second electromagnetic drive assembly are symmetrically arranged on two opposite sides of the movable seat. The first electromagnetic drive assembly and the second electromagnetic drive assembly respectively provide driving forces parallel to the front-rear direction to the movable seat.

[0012] In a possible design, the slide rail assembly includes a first slide shaft and a second slide shaft that are arranged on the base in parallel and at intervals, and a first slide groove and a second slide groove that are opened at the bottom of the movable seat; the first slide shaft is slidably arranged in the first slide groove, and the second slide shaft is slidably arranged in the second slide groove. The slide rail assembly provided in the present application includes a slide shaft and a slide groove that work in cooperation with each other, so that the sliding of the movable seat on the base is smoother and more stable.

[0013] Optionally, the friction surfaces of the sliding shaft and / or the sliding groove are coated with grease, so as to reduce the friction between the two and make the sliding of the movable seat on the base more stable and smooth.

[0014] In a possible design, the first sliding groove is a V-shaped groove, the second sliding groove is a U-shaped groove, and the groove width of the U-shaped groove is greater than the width of the second sliding shaft.

[0015] Among them, the V-shaped groove can better guide the sliding, while the U-shaped groove can be used for tolerance. The setting of the U-shaped groove can allow the movable seat to have a certain production error, ensuring that when the size of the movable seat is slightly larger or smaller due to production error, the movable seat can be successfully installed (sleeved) on the sliding shaft. By setting the U-shaped groove, the error tolerance rate can be improved, which is conducive to saving production costs.

[0016] In a possible design, the first electromagnetic drive component includes a first magnet and a first coil that are arranged parallel to and opposite to each other; the second electromagnetic drive component includes a second magnet and a second coil that are arranged parallel to and opposite to each other; the first magnet and the second magnet are fixedly arranged on opposite sides of the movable seat, and the first coil and the second coil are fixedly arranged on the base.

[0017] In a possible design, the first magnet and the second magnet both have N poles and S poles alternately arranged along the front-to-back direction; the N pole and S pole of the first magnet face the first coil, and the N pole and S pole of the second magnet face the second coil.

[0018] In a possible design, the first magnet is composed of a plurality of independent magnets, or the first magnet is an integrated magnetized structure; the second magnet is composed of a plurality of independent magnets, or the second magnet is an integrated magnetized structure.

[0019] In a possible design, the first coil is electrically connected to the first circuit board and fixedly mounted on the base through the first circuit board; the second coil is electrically connected to the second circuit board and fixedly mounted on the base through the second circuit board; the first circuit board and the second circuit board are electrically connected through a connecting circuit board.

[0020] Optionally, the first circuit board, the second circuit board and the connecting circuit board may be printed circuit boards.

[0021] Optionally, the first circuit board, the second circuit board and the connecting circuit board may be flexible circuit boards, rigid boards or rigid-flexible boards.

[0022] For example, the first circuit board 133 , the second circuit board 143 , and the connecting circuit board 143 are flexible circuit boards and are an integrated structure.

[0023] In a possible design, the first sliding shaft and the second sliding shaft are made of magnetic conductive materials, there is magnetic attraction between the first magnet and the first sliding shaft, and there is magnetic attraction between the second magnet and the second sliding shaft.

[0024] When there is magnetic attraction between the sliding shaft and the magnet, the electronic device using the voice coil motor can keep the movable seat always close to the sliding shaft without loosening when shooting in any direction such as towards the sky, towards the floor, or towards the horizon, thereby maintaining the stability of the movement and improving the performance of the voice coil motor.

[0025] In one possible design, the base includes a rear limit frame located at the rear side of the slide rail assembly and a front limit frame located at the front side of the slide rail assembly, and the rear limit frame and the front limit frame are used to limit the sliding range of the movable seat in the front and rear directions.

[0026] In a possible design, an extension portion is protruding from one side of the movable seat toward the rear limiting frame, and a positioning slot for inserting the extension portion is formed on the rear limiting frame.

[0027] By providing an extension portion extending in the direction of the limit frame on the movable seat, the installation of the magnet can be facilitated, and a corresponding positioning slot is provided in the rear limit frame to facilitate the insertion of the extension portion. On the one hand, the sliding of the movable seat can be better positioned and controlled, and on the other hand, the movable seat can be close to the rear limit frame, thereby increasing the stroke of the movable seat (i.e., the motor).

[0028] In a possible design, an elastic buffer is provided on the side of the rear limit frame facing the movable seat, and / or an elastic buffer is provided on the side of the front limit frame facing the movable seat.

[0029] The present application arranges elastic buffer parts on the sides of the rear limit frame and the front limit frame facing the movable seat, so as to buffer the impact of the movable seat, avoid the abnormal noise problem caused by long-stroke impact, and also reduce the dust problem after the impact, thereby improving the performance of the voice coil motor.

[0030] In a possible design, an elastic buffer is provided on the side of the movable seat facing the limiting frame, and / or an elastic buffer is provided on the side of the movable seat facing the front limiting frame.

[0031] In a possible design, a second lens mounting groove for mounting a second lens is provided on the rear limiting frame.

[0032] In a possible design, the voice coil motor further includes a displacement sensor assembly for sensing the position of the movable seat, and a processor for receiving a sensing signal from the displacement sensor assembly and controlling the current of the first coil and the second coil. Through the above configuration, the voice coil motor provided in the embodiment of the present application can achieve closed-loop control.

[0033] Alternatively, the processor may be a control circuit.

[0034] In one possible design, the displacement sensor assembly includes a magnetic grid fixedly disposed on the movable seat, and a magnetoresistive sensor fixedly disposed on the base, wherein the magnetoresistive sensor is used to sense changes in the magnetic field of the magnetic grid and transmit the sensing signal to the processor.

[0035] The present application detects the position of the movable seat by setting up mutually cooperating magnetic grids and magnetic resistance sensors, so that the voice coil motor provided by the present application has long-stroke position detection and closed-loop control capabilities.

[0036] Optionally, a groove is formed at the bottom of the movable seat, the magnetic grid is fixedly disposed in the groove, and the magnetoresistive sensor is fixed on the third circuit board and fixedly mounted on the base through the third circuit board.

[0037] Optionally, the magnetoresistive sensor is electrically connected to one end of the third circuit board, and the other end of the third circuit board is provided with a wiring terminal or a connector, so as to facilitate electrical connection with the processor.

[0038] Optionally, the magnetoresistive sensor may be any one of a tunnel magnetoresistive sensor, an anisotropic magnetoresistive sensor, a giant magnetoresistive sensor or a normal magnetoresistive sensor.

[0039] In one possible design, the displacement sensor assembly includes a third magnet fixed on the movable seat, and two Hall sensors fixed on the base; the magnetic pole direction of the third magnet is inclined relative to the front-to-back direction, and the two Hall sensors are used to sense the magnetic field changes of the third magnet and transmit the sensing signals to the processor.

[0040] The present application sets a third magnet and two Hall sensors that cooperate with each other to detect the position of the movable seat, so that the voice coil motor provided by the present application has long-stroke position detection and closed-loop control capabilities. In addition, the sensing signal of the dual Hall sensors combined with the preset algorithm can accurately determine the moving position of the movable seat, thereby achieving precise focusing.

[0041] In a possible design, the voice coil motor further includes a fourth magnet fixedly disposed at the bottom of the movable seat, and the fourth magnet and the third magnet are symmetrically disposed relative to the slide rail assembly. The fourth magnet can balance the gravity on both sides of the movable seat and the magnetic attraction with the slide shaft, thereby facilitating the stable and smooth sliding of the movable seat and improving the performance of the voice coil motor.

[0042] In a possible design, the movable seat includes two mounting brackets and a metal connector, and the two mounting brackets are fixedly connected by the metal connector. By providing the metal connector, the overall mechanical strength of the movable seat can be improved.

[0043] In a possible design, the metal connector includes two magnetic conductive sheets and a support bottom, and the two magnetic conductive sheets are fixedly connected through the support bottom; the two magnetic conductive sheets are respectively fixed on the two mounting brackets and are respectively located on the inner side of the first magnet and the second magnet. Through the above arrangement, the magnetic resistance on the inner side of the magnet can be reduced, and the magnetic field size on the outer side of the magnet can be increased, which is beneficial to improving the output of the coil, and further beneficial to improving the response efficiency and speed of the movable seat.

[0044] In a possible design, the metal connector is made of magnetic conductive material through an integral molding process.

[0045] In a second aspect, a camera module is provided, comprising a first lens and a voice coil motor provided by any possible design in the first aspect, wherein the voice coil motor is used to drive the first lens to move.

[0046] In a possible design, the camera module also includes a second lens arranged on the object side of the first lens, and an image sensor arranged on the image side of the first lens.

[0047] Optionally, the second lens may be fixedly mounted in the second lens mounting groove of the voice coil motor.

[0048] Optionally, the image sensor may be a complementary metal oxide semiconductor image sensor or a charge coupled device image sensor, which is mainly used to perform photoelectric conversion and analog signal / digital signal conversion on light signals, thereby outputting image data for display on a display unit such as a display screen.

[0049] In a possible design, the camera module further includes a reflective element disposed in the object side direction of the second lens. In other words, the camera module may be a periscope camera module.

[0050] Optionally, the reflective element may be a triangular prism or a reflective mirror.

[0051] In a possible design, an infrared filter is further provided between the first lens and the image sensor. By providing the infrared filter, infrared rays can be cut off, filtered, etc., thereby improving the imaging quality. The infrared filter can be, for example, a white glass filter or a blue glass filter.

[0052] In a third aspect, an electronic device is provided, comprising a camera module provided by any possible design in the second aspect.

[0053] Optionally, the electronic device may be a mobile phone, a tablet computer, a laptop computer, a camera, a video recorder, a still camera, an intelligent robot, a vehicle-mounted monitoring device, or other devices with a photo or video recording function. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of the overall structure of the voice coil motor provided in an embodiment of the present application.

[0055] Figure 2 It is a structural exploded diagram of the voice coil motor provided in an embodiment of the present application.

[0056] Figure 3 This is another structural exploded view of the voice coil motor provided in an embodiment of the present application.

[0057] Figure 4 It is a schematic diagram of the structure of the voice coil motor provided in an embodiment of the present application after the cover is removed.

[0058] Figure 5 It is a structural schematic diagram of the electromagnetic drive component driving the movable seat to move.

[0059] Figure 6 It is a schematic diagram of the structure of the base provided in the embodiment of the present application.

[0060] Figure 7 It is a schematic diagram of the structure of the movable seat provided in the embodiment of the present application.

[0061] Figure 8 It is a structural exploded view of the movable seat provided in the embodiment of the present application.

[0062] Fig. 9 This is a schematic diagram of the connection relationship of an example after the movable seat is removed from the mounting bracket.

[0063] Fig.10 This is another example of a connection relationship diagram after the movable seat is removed from the mounting bracket.

[0064] Fig.11 This is another structural schematic diagram of the voice coil motor provided in an embodiment of the present application with the cover removed.

[0065] Fig.12 yes Fig.11 The schematic diagram of the installation structure of the voice coil motor movable seat is shown.

[0066] Fig.13 This is a schematic diagram of the structure of another example of the voice coil motor provided in an embodiment of the present application with the cover removed.

[0067] Fig.14 yes Fig.13 The structure of the voice coil motor is shown in the figure.

[0068] Fig.15 yes Fig.13 The structure diagram of the electromagnetic driving assembly of the voice coil motor driving the movable seat to move is shown.

[0069] Fig.16 It is a structural schematic diagram of an installation structure of an electromagnetic drive component.

[0070] Fig.17 It is a structural schematic diagram of another installation structure of the electromagnetic drive component.

[0071] Fig.18 It is a structural schematic diagram of the camera module provided in an embodiment of the present application.

[0072] Fig.19 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0073] Reference numerals:

[0074] 100. Voice coil motor;

[0075] 110, base; 111, bottom plate; 112, rear limit frame; 113, front limit frame; 114, second lens mounting slot; 115, elastic buffer; 1151, connecting rib; 116, positioning slot; 117, first sliding shaft; 118, second sliding shaft; 119, metal reinforcing plate;

[0076] 120, movable seat; 121, mounting bracket; 1211, magnet mounting groove; 1212, buffer mounting groove; 1213, through groove; 122, metal connecting piece; 1221, magnetic guide sheet; 1222, supporting bottom; 1223, lifting part; 123, first lens mounting groove; 124, extension part; 125, connecting beam; 127, first slide groove; 128, second slide groove;

[0077] 130, first electromagnetic drive assembly; 131, first magnet; 132, first coil; 133, first circuit board; 134, limiting protrusion; 135, fifth magnet; 136, sixth magnet; 137, magnetic frame; 138, magnetic plug-in block;

[0078] 140, second electromagnetic drive assembly; 141, second magnet; 142, second coil; 143, second circuit board; 144, connecting circuit board;

[0079] 150, cover body; 151, top plate; 152, side plate;

[0080] 160. Light entrance;

[0081] 170. Light outlet;

[0082] 180, displacement sensor assembly; 181, magnetic grid; 182, magnetoresistive sensor; 183, third circuit board; 184, third magnet; 185, Hall sensor; 186, fourth magnet; 187, fourth circuit board;

[0083] 200, camera module; 210, reflective element; 220, second lens; 230, first lens; 240, infrared filter; 250, image sensor;

[0084] 300. Electronic device; 310. Electronic device housing; 320. Display screen. DETAILED DESCRIPTION

[0085] The technical solution in the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0086] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0087] In the description of the present application, it should be understood that the terms "upper", "lower", "side", "inside", "outside", "top", "bottom", etc. indicate orientations or positional relationships based on the installation, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0088] It should also be noted that, in the embodiments of the present application, the same figure mark is used to represent the same component or the same part. For the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the figure mark also applies to other identical parts or components.

[0089] In the description of this application, it should be noted that the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0090] For ease of understanding, the technical terms involved in this application are explained and described below.

[0091] Lens: It is a component that uses the refraction principle of the lens to make the light of the scene pass through the lens and form a clear image on the focusing plane. A lens may contain one or more lenses, where the lens can be a concave lens or a convex lens.

[0092] Optical axis: The direction in which light is transmitted by an optical system, with reference to the principal ray of the central field of view. For symmetrical transmission systems, it generally coincides with the centerline of rotation of the optical system. For off-axis and reflective systems, the optical axis may also appear as a broken line.

[0093] Object side and image side: With the lens or camera as the boundary, the side where the object is located is the object side, and the side where the image of the object is located is the image side.

[0094] Focus: Focus is also called light and focusing. The process of changing the distance between the object and the distance between the objects through the camera focus mechanism to make the image of the object clear is called focusing. Usually, digital cameras have multiple focusing modes, including automatic focus, manual focus or multiple focus modes.

[0095] Autofocus: Autofocus uses the principle of light reflection from an object. The reflected light is received by the sensor on the camera (such as a charge-coupled device (CCD)), processed by a computer, and drives the electric focus device to focus. This is called autofocus.

[0096] Voice coil motor: Voice coil motor (VCM) is also called voice coil motor or voice coil linear motor because its structure is similar to the voice coil of a speaker. A voice coil motor is a device that converts electrical energy into mechanical energy. It uses the magnetic field of a permanent magnet and the magnetic field generated by a powered coil conductor to generate motion on the magnetic poles, which in turn causes the magnetic poles to drive the lens to move in a linear or limited swing angle. Voice coil motors are mainly used for small stroke, high speed, and high acceleration motion, and are suitable for use in small spaces.

[0097] For camera modules, voice coil motors are usually used for focusing and optical image stabilization (OIS). In this application, the voice coil motor is mainly used for focusing.

[0098] In recent years, with the development of optical imaging technology, people have higher and higher requirements for the camera functions of portable electronic devices such as mobile phones. Not only are the camera modules equipped with electronic devices required to achieve functions such as background blur and clear night shooting, but they are also required to achieve telephoto shooting and macro shooting.

[0099] Due to the advantages of voice coil motors such as simple structure, small size, low energy consumption, no noise, fast response speed, precise displacement and low price, voice coil motors (VCM) are currently commonly used to focus camera modules.

[0100] A voice coil motor usually includes three parts: a fixed part, a movable part and an actuator. The fixed part has a housing space for accommodating the movable part. The movable part is movably arranged on the fixed part for fixing an adjustable lens group. The actuator is used to drive the movable part to translate so as to change the distance between the adjustable lens group and the fixed lens group, thereby achieving lens focusing.

[0101] Specifically, the actuator usually includes a combination of a coil and a magnet. The coil and the magnet can be fixed on the fixed part and the movable part respectively. The two can be arranged in parallel. By connecting direct current to the coil, a driving force can be provided to the magnet. By changing the magnitude and direction of the direct current of the coil, the magnitude and direction of the force on the magnet covered by the magnetic field can be controlled. The magnet can provide the driving force to the movable part to drive the movable part to translate. The movable part further drives the adjustable lens group to approach or move away from the fixed lens group, thereby realizing automatic focusing of the lens.

[0102] When a mobile phone is shooting telephoto, the object being photographed is far away from the user and is usually a large object, such as a landscape or a building, which can easily fill the entire screen. The focal length of telephoto shooting is usually short, and the required voice coil motor stroke is also small.

[0103] Macro photography refers to photographing an object at a relatively close shooting distance with a large magnification, and is often used to photograph very fine objects, such as flowers and insects. Macro photography usually requires photographing the object at a close distance. The closer the working distance, the longer the stroke of the voice coil motor required.

[0104] In order to achieve both telephoto and macro shooting with the same camera module, the adjustable lens group in the camera module needs to have a longer dragging capability. For a camera module that uses a voice coil motor for dragging, the voice coil motor needs to have an extra-large stroke.

[0105] The current travel of voice coil motors is usually very limited, and can only meet the needs of telephoto shooting, but cannot meet the needs of macro shooting. Specifically, the current camera modules with telephoto shooting functions have difficulty shooting objects that are very close, and cannot shoot them large enough and clear enough. Because when the object is very close to the camera, it will be difficult to focus (the distance required for focusing exceeds the travel range of the current voice coil motor), and the image will look blurry. It is for this reason that most mobile phone cameras can only focus at a distance of 6 to 7 centimeters from the lens. When getting closer to the object, the camera module will be completely unable to focus, and the shooting effect is always unsatisfactory.

[0106] Based on this, the embodiments of the present application provide a voice coil motor, a lens module and an electronic device. By improving the structure of the voice coil motor, the voice coil motor has a larger stroke, which can meet the requirements of both telephoto shooting and macro shooting, allowing the user to flexibly switch between the two working modes of telephoto shooting and macro shooting, thereby improving the user experience.

[0107] In a first aspect, an embodiment of the present application first provides a voice coil motor, which can be used to drive the lens of a camera module to move, thereby achieving the purpose of focusing. Figure 1 is a schematic diagram of the overall structure of the voice coil motor 100 provided in an embodiment of the present application, Figure 2 is a structural exploded view of the voice coil motor 100 provided in an embodiment of the present application. Figure 3 is another structural exploded view of the voice coil motor 100 provided in an embodiment of the present application. Figure 4 1 is a schematic diagram of the structure of the voice coil motor 100 provided in an embodiment of the present application after the cover is removed. Figure 5 It is a structural schematic diagram of the electromagnetic driving component driving the movable seat 120 to move.

[0108] like Figure 1-Figure 5 As shown, the voice coil motor 100 provided in the embodiment of the present application includes a base 110 , a movable base 120 , a slide rail assembly, a first electromagnetic driving assembly 130 , the second electromagnetic driving assembly 140 and a cover 150 .

[0109] The cover 150 covers the base 110 to form a mounting cavity, in which the movable seat 120, the slide rail assembly, the first electromagnetic drive assembly 130, the second electromagnetic drive assembly 140 and the optical lens are accommodated.

[0110] like Figure 1 , Figure 2 , Figure 4As shown, the voice coil motor 100 is also formed with a light inlet 160 and a light outlet 170 respectively on opposite sides of the mounting cavity. A light path is formed between the light inlet 160 and the light outlet 170. In the mounting cavity, optical elements such as an optical lens are arranged on the light path. After entering from the light inlet 160, the light passes through the mounting cavity, and after being processed (e.g., refracted) by optical elements such as an optical lens in the mounting cavity, the light is emitted from the light outlet 170.

[0111] The cover 150 is installed on the base 110 to protect and seal the components in the accommodating cavity. The present application does not limit how the cover 150 is installed on the base 110, including but not limited to screws, buckles, adhesives and other connection methods.

[0112] In order to reduce the impact on the operation of the electromagnetic drive assembly inside the cavity, the cover 150 can be made of a non-magnetic material. Optionally, the cover 150 can be made of plastic or a non-magnetic metal. For example, the cover 150 can be made of stainless steel SUS316L, or aluminum alloy, copper alloy, magnesium alloy, etc.

[0113] like Figure 2 As shown, the cover body 150 is in a cover shape, including a top plate 151 and two side portions ( Figure 2 The cover 150 is covered on the base 110, and the light inlet 160 and the light outlet 170 are formed on the left and right sides of the voice coil motor 100. Optionally, the cover 150 can be formed by forging, die casting, injection molding and other processes, which is not limited in the present application.

[0114] The slide rail assembly is formed in the installation cavity to guide the sliding direction of the movable seat 120. Figure 4 , Figure 5 As shown, the slide rail assembly is arranged along the AB direction, where AB is the direction of the light path, wherein direction A represents the forward direction of the light, and direction B represents the backward direction opposite to the forward direction. Therefore, it can also be said that the slide rail assembly is arranged along the front-to-back direction, which is also the moving direction of the movable seat 120.

[0115] The specific configuration of the rail assembly is not limited in the present application, as long as it can play the role of sliding and guiding the direction. For example, the rail assembly can be a slider type (the base 110 and the movable seat 120 are respectively provided with a slider and a slide groove that cooperate with each other), a roller type, a steel ball type or a gear type. The rail assembly provided in the present application embodiment will be further introduced below in conjunction with the accompanying drawings.

[0116] The movable seat 120 is used to carry the first lens (not shown in the figure), and is slidably arranged on the base 110 through the slide rail assembly. The first lens is fixed on the movable seat 120, and the movable seat 120 moves along the front-to-back direction through the slide rail assembly, thereby driving the first lens to move along the front-to-back direction. For example, the first lens can be driven forward (i.e. Figure 4 A direction), or the first lens can be driven backward (i.e. Figure 4 Move in the direction of B).

[0117] Optionally, the first lens may include one lens, and the lens may be a concave lens or a convex lens.

[0118] Optionally, the first lens may also include multiple lenses, in which case the first lens is a lens group composed of multiple lenses, and the multiple lenses may include concave lenses and / or convex lenses. Since the first lens can move forward and backward, the first lens may also be called an adjustable lens, an adjustable lens group, a mobile lens, a mobile lens group, etc.

[0119] like Figure 4 , Figure 5 As shown, the voice coil motor 100 further includes an electromagnetic driving assembly, which is used to provide a driving force to the movable seat 120 to drive the movable seat 120 to slide in the front-rear direction relative to the base 110 .

[0120] Here, the electromagnetic drive assembly is a combination of a coil and a magnet. The coil can be arranged on one of the base 110 and the movable seat 120, and the magnet can be arranged on the other of the two. The coil and the magnet are arranged in parallel and facing each other. By passing direct current to the coil, an interaction force can be generated between the coil and the magnet, thereby driving the movable seat 120 to slide in the front-rear direction relative to the base 110. By changing the magnitude and direction of the current, the magnitude and direction of the force can be changed, thereby controlling the sliding speed and direction of the movable seat 120.

[0121] In the embodiment of the present application, the electromagnetic drive assembly includes a first electromagnetic drive assembly 130 and a second electromagnetic drive assembly 140. The first electromagnetic drive assembly 130 and the second electromagnetic drive assembly 140 are respectively arranged on opposite sides of the slide rail assembly (i.e., on the left and right sides in the front-to-back direction). The first electromagnetic drive assembly 130 and the second electromagnetic drive assembly 140 work independently without affecting each other. Both sides of the slide rail assembly can provide driving force to the movable seat 120 at the same time to drive the movable seat 120 to slide smoothly in the front-to-back direction relative to the base 110.

[0122] According to the voice coil motor 100 provided in the embodiment of the present application, the movable seat 120 is slidably set on the base 110 through a slide rail assembly, and can slide back and forth relative to the base 110, so that the movable seat 120 has a larger movement range relative to the base 110, thereby making the voice coil motor 100 have a larger motor stroke, thereby being able to meet the use requirements of telephoto shooting and macro shooting at the same time, allowing the user to flexibly switch between the two working modes of telephoto shooting and macro shooting, thereby improving the user experience.

[0123] For example, when telephoto shooting is required, the movable seat 120 can be used to drive the first lens to move backward to achieve focusing (i.e. Figure 4 , Figure 5 When macro photography is required, the movable seat 120 can be used to drive the first lens to move forward to achieve focusing (i.e. Figure 4 , Figure 5 A direction in the middle).

[0124] The voice coil motor 100 provided in the embodiment of the present application includes a first electromagnetic drive assembly 130 and a second electromagnetic drive assembly 140 respectively arranged on opposite sides of the slide rail assembly. Both sides of the slide rail assembly can provide driving force to the movable seat 120 at the same time. Compared with the unilateral output, it can avoid the movable seat 120 from generating a movement inclination angle when sliding, thereby ensuring that the sliding of the movable seat 120 is smoother and more stable. In addition, the position information of the movable seat 120 collected by the displacement sensor is also more accurate, which can improve the accuracy of the closed-loop control of the voice coil motor 100, thereby improving the shooting effect of the camera module.

[0125] Furthermore, in the embodiment of the present application, the first electromagnetic drive component 130 and the second electromagnetic drive component 140 are symmetrically arranged relative to the slide rail component, thereby ensuring the symmetry of the output on both sides and avoiding the movement inclination angle caused by uneven output, thereby further improving the stability of the movement of the movable seat 120 and further improving the shooting effect of the camera module.

[0126] For example, Figure 5 As shown, the first electromagnetic drive assembly 130 and the second electromagnetic drive assembly 140 are symmetrically arranged on two opposite sides of the movable seat 120. The first electromagnetic drive assembly 130 and the second electromagnetic drive assembly 140 respectively provide driving forces to the movable seat 120 in a direction parallel to the front-rear direction (AB direction).

[0127] The slide rail assembly provided in the embodiment of the present application will be further described below in conjunction with the accompanying drawings. Figure 6 is a schematic diagram of the structure of the base 110 provided in an embodiment of the present application, Figure 7 It is a schematic diagram of the structure of the movable seat 120 provided in an embodiment of the present application.

[0128] like Figure 2 , Figure 5-Figure 7 As shown, the slide rail assembly in the embodiment of the present application includes a first slide shaft 117 and a second slide shaft 118 which are arranged on the base 110 in parallel and at intervals, and a first slide groove 127 and a second slide groove 128 which are opened at the bottom of the movable seat 120. The first slide shaft 117 is slidably arranged in the first slide groove 127, and the second slide shaft 118 is slidably arranged in the second slide groove 128. The slide rail assembly provided in the embodiment of the present application includes a slide shaft and a slide groove which work in cooperation with each other, so that the sliding of the movable seat 120 on the base 110 is more stable and smooth.

[0129] Specifically, the slide rail assembly provided in the embodiment of the present application includes a combination of mutually adapted slide shafts and slide grooves, wherein the slide shaft is fixed on the base 110, including a first slide shaft 117 and a second slide shaft 118 that are parallel to each other and spaced apart. The slide groove is correspondingly opened at the bottom of the movable seat 120, including a first slide groove 127 and a second slide groove 128 that are parallel to each other and spaced apart.

[0130] The first slide groove 127 and the second slide groove 128 are correspondingly sleeved on the first slide shaft 117 and the second slide shaft 118, and the slide shaft and the slide groove can slide relative to each other. Under the action of the electromagnetic driving component, the movable seat 120 can slide forward and backward along the slide shaft relative to the base 110.

[0131] Optionally, in other embodiments, the positions of the slide groove and the slide shaft can be swapped. For example, the first slide shaft 117 and the second slide shaft 118 can be set at the bottom of the movable seat 120, and the first slide groove 127 and the second slide groove 128 are formed on the upper surface of the base 110, which is not limited in this application.

[0132] Optionally, in other implementations, more combinations of sliding shafts and sliding grooves may be provided. For example, three sliding shafts and three sliding grooves may be provided accordingly. This application does not limit this.

[0133] Optionally, the friction surfaces of the sliding shaft and / or the sliding groove are coated with grease, so as to reduce the friction between the two, so that the sliding of the movable seat 120 on the base 110 is more stable and smooth.

[0134] like Figure 5 , Figure 7As shown, the first slide groove 127 is a V-shaped groove, and the second slide groove is a U-shaped groove, and the groove width of the U-shaped groove is greater than the width of the second slide shaft 118. Among them, the V-shaped groove can better guide the sliding, and the U-shaped groove can be used for tolerance. The setting of the U-shaped groove can allow the movable seat 120 and the like to have a certain production error, ensuring that when the size of the movable seat 120 is slightly larger or smaller due to the production error, the movable seat 120 can be successfully installed (sleeved) on the slide shaft. By setting the U-shaped groove, the fault tolerance rate can be improved, which is conducive to saving production costs.

[0135] like Figure 2 , Figure 6 As shown, the base 110 includes a bottom plate 111, a rear limit frame 112 fixedly mounted on the rear side of the bottom plate 111, and a front limit frame 113 fixedly mounted on the front side of the bottom plate 111. A light inlet 160 is formed on the rear limit frame 112, and a light outlet 170 is formed on the front limit frame 113. An installation space is formed between the rear limit frame 112 and the front limit frame 113 for installing components such as the movable seat 120, the electromagnetic drive assembly, and the slide rail assembly.

[0136] The rear limit frame 112 is located at the rear side of the slide rail assembly (slide shaft), and the front limit frame 113 is located at the front side of the slide rail assembly. The rear limit frame 112 and the front limit frame 113 are used to limit the sliding range of the movable seat 120 in the front and rear directions.

[0137] The rear limit frame 112, the bottom plate 111 and the front limit frame 113 form a U-shaped structure as a whole. The front ends of the first sliding shaft 117 and the second sliding shaft 118 are fixed on the front limit frame 113, and the rear ends are fixed on the rear limit frame 112. There is a gap between the first sliding shaft 117 and the second sliding shaft 118 and the bottom plate 111 so that the movable seat 120 can be smoothly installed on the first sliding shaft 117 and the second sliding shaft 118.

[0138] like Figure 6 As shown, in the embodiment of the present application, a second lens mounting groove 114 for mounting a second lens is provided on the rear limiting frame 112 .

[0139] Specifically, the voice coil motor 100 provided in the embodiment of the present application can also be installed with a second lens (not shown in the figure), and the second lens is fixedly installed in the second lens installation groove 114 opened in the rear limit frame 112. The light entering from the light inlet 160 is incident on the second lens, and after being processed by the second lens, it continues to be incident on the first lens installed on the movable seat 120. The light that continues to be processed by the first lens is finally emitted from the light outlet 170.

[0140] The first lens and the second lens are located on the optical axis of the optical path, and the central axis can coincide with the optical axis. The electromagnetic drive assembly drives the movable seat 120 to move, which can change the distance between the first lens and the second lens, thereby enabling optical focusing.

[0141] Optionally, the second lens may include one lens, and the lens may be a concave lens or a convex lens.

[0142] Optionally, the second lens may also include multiple lenses, in which case the second lens is a lens group composed of multiple lenses, and the multiple lenses may include concave lenses and / or convex lenses. Since the second lens is fixed inside the voice coil motor 100, the second lens may also be referred to as a fixed lens, a fixed lens group, etc.

[0143] In an embodiment of the present application, the second lens is disposed on the object side of the first lens. In other embodiments, the second lens may also be disposed on the image side of the first lens, for example, fixed on the front limit frame 113, and the present application does not limit this.

[0144] like Figure 6 As shown, the base 110 further includes a metal reinforcing plate 119 fixedly disposed on the outer surface of the bottom plate 111 . The mechanical strength of the base 110 can be improved by disposing the metal reinforcing plate 119 .

[0145] Optionally, a protrusion may be provided on the outer surface of the bottom plate 111 , a through hole may be opened at a corresponding position on the metal reinforcing plate 119 , the protrusion may be embedded in the through hole, and the metal reinforcing plate 119 may be fixedly assembled on the bottom plate 111 .

[0146] Optionally, in order to reduce the impact on the operation of the electromagnetic drive assembly inside the cavity, the metal reinforcing plate 119 can be made of non-magnetic metal. For example, the cover 150 can be made of stainless steel SUS316L, or aluminum alloy, copper alloy, magnesium alloy and the like.

[0147] Optionally, the metal reinforcing plate 119 is bent and extended to the outer surfaces of the rear limiting frame 112 and the front limiting frame 113 , thereby achieving a better mechanical reinforcement effect.

[0148] like Figure 3 , Figure 4 , Figure 6 As shown, in the embodiment of the present application, an elastic buffer 115 is provided on the side of the rear limit frame 112 facing the movable seat 120 , and an elastic buffer 115 is provided on the side of the front limit frame 113 facing the movable seat 120 .

[0149] The elastic buffer 115 is made of elastic material, can buffer and reduce the impact of the movable seat 120, and has structural recovery ability. For example, the elastic buffer 115 can be made of elastic soft rubber.

[0150] The present application provides an elastic buffer 115 on the side of the rear limit frame 112 and the front limit frame 113 facing the movable seat 120, so as to buffer the impact of the movable seat 120, avoid abnormal noise caused by long-stroke impact, and also reduce dust generation after the impact, thereby improving the performance of the voice coil motor 100.

[0151] like Figure 6 As shown, a mounting groove can be set on the rear limit frame 112, and the elastic buffer 115 can be fixedly set (for example, embedded) in the mounting groove. The outer end of the elastic buffer 115 protrudes from the inner surface of the rear limit frame 112, so that it can play a buffering and shock-absorbing effect when colliding with the movable seat 120.

[0152] Optionally, in order to improve the fixing effect, the elastic buffer member 115 may be glued into the mounting groove by glue.

[0153] Similarly, the elastic buffer 115 can also be glued and fixed to the side of the front limit frame 113 facing the movable seat 120, and the outer end of the elastic buffer 115 protrudes from the inner surface of the front limit frame 113, so that it can play a buffering and shock-absorbing effect when colliding with the movable seat 120.

[0154] Optionally, in other embodiments, according to specific usage requirements, the elastic buffer 115 may be provided on only one of the rear limiting frame 112 and the front limiting frame 113 , and the present application does not limit this.

[0155] Figure 8 It is a structural exploded view of the movable seat provided in the embodiment of the present application.

[0156] like Figure 4 , Figure 5 , Figure 7 , Figure 8 As shown, similarly, in order to further improve the shock absorption effect, an elastic buffer 115 can also be set on the side of the movable seat 120 facing the limit frame 112, and an elastic buffer 115 can also be set on the side of the movable seat 120 facing the front limit frame 113.

[0157] like Figure 8As shown, a buffer installation groove 1212 can be opened on the front and rear side surfaces of the movable seat 120, and the elastic buffer 115 can be fixedly installed in the groove. The outer end of the elastic buffer 115 protrudes from the side surface of the movable seat 120, so that it can play a buffering and shock-absorbing effect when colliding with the rear limit frame 112 or the front limit frame 113.

[0158] like Figure 8 As shown, a through slot 1213 is provided on the movable seat 120, and the through slot 1213 is connected to the two buffer mounting slots 1212 on both sides of the movable seat 120. The two elastic buffers 115 can be fixedly connected by connecting ribs 1151. The two elastic buffers 115 and the connecting ribs 1151 can be correspondingly accommodated in the two buffer mounting slots 1212 and the through slot 1213.

[0159] Through the above arrangement, the installation firmness of the elastic buffer 115 can be improved, so that it is not easy to fail due to dislocation under multiple collisions, thereby improving the performance of the voice coil motor 100.

[0160] Optionally, the two elastic buffer members 115 and the connecting rib 1151 may be an integral structure, for example, integrally formed by an injection molding process.

[0161] like Figure 5-Figure 8 As shown, the movable seat 120 is provided with an extension portion 124 protruding from one side toward the rear limit frame 112, and a positioning slot 116 is formed on the rear limit frame 112 for the extension portion 124 to be inserted. The extension portion 124 includes two portions, which are symmetrically arranged on the two side portions of the movable seat 120. Correspondingly, two positioning slots 116 are also correspondingly provided on both sides of the rear limit frame 112.

[0162] By providing an extension portion 124 extending toward the limit frame 112 on the movable seat 120, the installation of the magnet can be facilitated, and a positioning slot 116 is correspondingly provided in the rear limit frame 112 to facilitate the insertion of the extension portion 124. On the one hand, the sliding of the movable seat 120 can be better positioned and controlled, and on the other hand, the movable seat 120 can be close to the rear limit frame 112, thereby increasing the stroke of the movable seat 120 (i.e., the motor).

[0163] The first electromagnetic drive assembly 130 and the second electromagnetic drive assembly 140 in the embodiment of the present application will be further introduced below in conjunction with the accompanying drawings.

[0164] like Figure 3-Figure 5 , Figure 7 , Figure 8As shown, the first electromagnetic drive assembly 130 includes a first magnet 131 and a first coil 132 which are arranged parallel to each other and face each other. The second electromagnetic drive assembly 140 includes a second magnet 141 and a second coil 142 which are arranged parallel to each other and face each other. The first magnet 131 and the second magnet 141 are fixedly arranged on opposite sides of the movable seat 120, and the first coil 132 and the second coil 142 are fixedly arranged on the base 110.

[0165] Specifically, the coil of the electromagnetic drive assembly is fixedly mounted on the base 110, and the magnet is fixedly mounted on the movable seat 120. When the coil is energized, an interaction force is generated between the coil and the magnet, and the interaction force drives the magnet to move, and the magnet further drives the movable seat (and the first lens) to move together. In other words, the voice coil motor 100 provided in the embodiment of the present application is a moving magnet voice coil motor.

[0166] Optionally, in other embodiments, the positions of the magnet and the coil can also be swapped. In this case, the magnet is fixed on the base 110, and the coil is fixed on the movable seat 120. The interaction force between the magnet and the coil can drive the coil to move, and the coil further drives the movable seat (and the first lens) to move together. In other words, the voice coil motor 100 can also be a moving coil voice coil motor.

[0167] like Figure 5 , Figure 7 and Figure 8 As shown, in an embodiment of the present application, the first electromagnetic drive component 130 and the second electromagnetic drive component 140 are symmetrically arranged on opposite sides of the movable seat 120, and magnet mounting grooves 1211 are respectively opened on both sides of the movable seat 120, and the first magnet 131 and the second magnet 141 are respectively fixedly installed (for example, by gluing) in the magnet mounting grooves 1211.

[0168] The first magnet 131 and the second magnet 141 both have N poles and S poles alternately arranged along the front-to-back direction, the N pole and S pole of the first magnet 131 are oriented toward the first coil 132, and the N pole and S pole of the second magnet 141 are oriented toward the second coil 142. Here, the front-to-back direction is the direction in which the sliding shaft is arranged, that is, the sliding direction of the movable seat 120, and is also the direction of the optical axis.

[0169] The coil is located outside the movable seat 120 and is vertically arranged. The magnet faces the coil and is also arranged vertically perpendicular to the bottom surface, so that the width of the voice coil motor 100 can be reduced.

[0170] For example, in Figure 5, the magnetic poles of the first magnet 131 along the forward direction (direction A) are sequentially N poles and S poles. The magnetic poles of the second magnet 141 along the forward direction are also sequentially N poles and S poles. Of course, the alternating order of the magnetic poles of the second magnet 141 and the alternating order of the first magnet 131 may also be opposite, for example, the magnetic poles of the second magnet 141 along the forward direction may also be sequentially S poles and N poles.

[0171] Specifically, the installed magnet and coil are parallel and facing each other, and the magnetic pole of the magnet faces the coil. The coil is rectangular, including two horizontal sides parallel to the optical axis (front-to-back direction) and two vertical sides perpendicular to the optical axis. When the coil is energized, the two horizontal sides of the coil are subjected to forces of the same magnitude and opposite directions, which cancel each other out. The two vertical sides are subjected to forces of the same direction due to the opposite magnetic field directions of the magnetic field in which they are located, and the current directions are also opposite. In this way, the two vertical sides are subjected to forces of the same direction, and the magnitudes of the forces are superimposed on each other. According to the principle of action and reaction force, the magnet is subjected to the reaction force of the superimposed action force at this time. The reaction force can overcome the friction between the sliding shaft and the sliding groove, and push the movable seat 120 to drive the first lens to move forward or backward, thereby achieving optical focus.

[0172] As a specific example, assume that the current direction in the first coil 132 is clockwise, and the magnetic poles of the first magnet 131 along the forward direction (direction A) are N pole and S pole, respectively. At this time, the two horizontal sides of the first coil 132 are subjected to forces of equal magnitude and opposite directions and cancel each other out, and according to the left-hand rule, the vertical side on the left side is subjected to a forward force, and the vertical side on the right side is also subjected to a forward force, and the two forward forces are superimposed on each other, and the first magnet 131 is subjected to a reaction force of the superimposed forces, that is, at this time, the first magnet 131 is subjected to a backward force, and the backward force pushes the movable seat 120 to drive the first lens to move backward (direction B).

[0173] Optionally, the first magnet 131 may be composed of a plurality of independent magnets, and the magnetic poles of the plurality of independent magnets facing the first coil 132 are alternately arranged. Alternatively, the first magnet 131 may also be an integrated magnetization structure, in which case the first magnet 131 is a whole magnet, and the side facing the first coil 132 is a planar two-stage magnetization (magnetization) structure.

[0174] Similarly, the second magnet 141 may be composed of a plurality of independent magnets, and the magnetic poles of the plurality of independent magnets facing the second coil 142 are alternately arranged. Alternatively, the second magnet 141 may also be an integrated magnetization structure, in which case the second magnet 141 is a whole magnet, and the side facing the second coil 142 is a planar two-level magnetization (magnetization) structure.

[0175] like Figure 2-Figure 4As shown, the first coil 132 is electrically connected to the first circuit board 133, and is fixedly mounted on the base 110 through the first circuit board 133. The second coil 142 is electrically connected to the second circuit board 143, and is fixedly mounted on the base 110 through the second circuit board 143. The first circuit board 133 and the second circuit board 143 are electrically connected through the connecting circuit board 143. In other words, the installation and fixation of the coil and the electrical connection with the external device (such as the control mainboard) are realized through the circuit board.

[0176] Optionally, the first circuit board 133 , the second circuit board 143 and the connecting circuit board 143 may be printed circuit boards (PCBs).

[0177] Optionally, the first circuit board 133 , the second circuit board 143 and the connecting circuit board 144 may be a flexible printed circuit (FPC), a hard board or a hard-flex board.

[0178] For example, the first circuit board 133 , the second circuit board 143 , and the connecting circuit board 143 are FPCs and are an integrated structure.

[0179] like Figure 3 As shown, a plurality of limiting protrusions 134 are fixedly provided on the inner surfaces of the first circuit board 133 and the second circuit board 143 and around the outer sides of the coils. By providing the limiting protrusions 134, after the first circuit board 133 and the second circuit board 143 are installed on the base 110, the coils can be supported and protected to prevent the coils from being crushed and becoming ineffective.

[0180] like Figure 5 As shown, in the embodiment of the present application, the first sliding shaft 117 and the second sliding shaft 118 are made of magnetic conductive material, there is magnetic attraction between the first magnet 131 and the first sliding shaft 117, and there is magnetic attraction between the second magnet 141 and the second sliding shaft 118.

[0181] When there is magnetic attraction between the sliding shaft and the magnet, when the electronic device using the voice coil motor 100 is shooting in any direction such as facing the sky, facing the floor, facing the horizontal, etc., the movable seat 120 can always be kept tightly attached to the sliding shaft without loosening, thereby maintaining the stability of the movement and improving the performance of the voice coil motor 100.

[0182] The specific structure of the movable seat 120 in the embodiment of the present application is further described below in conjunction with the accompanying drawings.

[0183] like Figure 7 , Figure 8As shown, the movable seat 120 includes two mounting brackets 121 and a metal connector 122, and the two mounting brackets 121 are fixedly connected by the metal connector 122. By providing the metal connector 122, the overall mechanical strength of the movable seat 120 can be improved.

[0184] Specifically, both ends of the metal connector 122 are respectively fixedly connected to a mounting bracket 121, and the mounting bracket 121 can be a plastic part. The end of the metal connector 122 can be fixed (embedded) inside the mounting bracket 121 by injection molding, so that the movable seat 120 as a whole has higher mechanical strength.

[0185] like Figure 7 As shown, the two mounting brackets 121 and the metal connector 122 jointly define a first lens mounting groove 123 for fixing and mounting the first lens. The bottom of the two mounting brackets 121 is respectively provided with a slide groove, namely the aforementioned first slide groove 127 and second slide groove 128. The two mounting brackets 121 are also respectively provided with a magnet mounting groove 1211 for mounting a magnet, a buffer mounting groove 1212 for mounting an elastic buffer 115, and a through groove 1213, etc.

[0186] Fig. 9 It is a schematic diagram of an example of connection relationship after the movable seat 120 is removed from the mounting bracket 121.

[0187] like Figure 8 , Fig. 9 As shown, the metal connector 122 includes two magnetic conductive sheets 1221 and a support bottom 1222, and the two magnetic conductive sheets 1221 are fixedly connected through the support bottom 1222. The two magnetic conductive sheets 1221 are respectively fixed on the two mounting brackets 121, and are respectively located on the inner side of the first magnet 131 and the second magnet 141. Through the above arrangement, the magnetic resistance on the inner side of the magnet can be reduced, and the magnetic field size on the outer side of the magnet can be increased, which is beneficial to improving the output of the coil, and further beneficial to improving the response efficiency and speed of the movable seat 120.

[0188] Optionally, the magnetic conductive sheet 1221 may include a folded portion, which causes the magnetic conductive sheet 1221 to have an overlapping portion, and the overlapping portion can further reduce the magnetic resistance on the inner side of the magnet, thereby further increasing the magnetic field size on the outer side of the magnet and the output of the coil.

[0189] like Fig. 9 As shown, the supporting bottoms 1222 are fixedly connected to the magnetic conductive sheet 1221 via a raised portion 1223 . The raised portion 1223 can raise the height of the magnet to a certain extent, increase the distance between the magnet and the sliding shaft, and further enhance the magnetic attraction between the magnet and the sliding shaft.

[0190] Optionally, the metal connector 122 may be made of magnetic conductive material through an integrated molding process, thereby improving the mechanical stability of the metal connector 122. The integrated molding process may be, for example, forging or die-casting.

[0191] like Figure 7 , Figure 8 As shown, the upper parts of the two mounting brackets 121 are also connected by a connecting beam 125, so as to improve the mechanical strength of the entire movable seat 120. The connecting beam 125 can also serve as a flow channel when the two mounting brackets 121 are integrally formed by an injection molding process.

[0192] like Fig. 9 As shown, the voice coil motor 100 further includes a displacement sensor assembly 180 for sensing the position of the movable seat 120, and a processor for receiving a sensing signal from the displacement sensor assembly 180 and controlling the current of the first coil 132 and the second coil 142. Through the above configuration, the voice coil motor 100 provided in the embodiment of the present application can achieve closed-loop control.

[0193] Alternatively, the processor may be a control circuit.

[0194] like Fig. 9 As shown, in the embodiment of the present application, the displacement sensor assembly 180 includes a magnetic grid 181 fixedly disposed on the movable seat 120, and a magnetoresistive sensor 182 fixedly disposed on the base 110, and the magnetoresistive sensor 182 is used to sense the magnetic field changes of the magnetic grid 181 and transmit the sensing signal to the processor.

[0195] The present application detects the position of the movable seat 120 by setting a magnetic grid 181 and a magnetoresistive sensor 182 that cooperate with each other, so that the voice coil motor 100 provided by the present application has long-stroke position detection and closed-loop control capabilities.

[0196] In the embodiment of the present application, a groove is formed at the bottom of the movable seat 120, and the magnetic grid 181 is fixedly disposed in the groove, while the magnetoresistive sensor 182 is fixed on the third circuit board 183 and fixedly mounted on the base 110 through the third circuit board 183.

[0197] Optionally, the magnetoresistive sensor 182 is electrically connected to one end of the third circuit board 183, and the other end of the third circuit board 183 is provided with a wiring terminal or a connector, so as to facilitate electrical connection with the processor.

[0198] Optionally, the magnetoresistive sensor 182 may be any one of a tunnel magnetoresistance (TMR) sensor, anisotropic magnetoresistance (AMR) sensor, giant magnetoresistance (GMR) sensor, or an ordinary magnetoresistance (OMR) sensor.

[0199] Fig.10 It is another example of the connection relationship diagram of the movable seat 120 after removing the mounting bracket 121.

[0200] Compared with the aforementioned Fig. 9 In the embodiment shown, Fig.10 In the illustrated embodiment, the displacement sensor assembly 180 may also include a combination of a Hall sensor and a magnet.

[0201] In this embodiment, the displacement sensor assembly 180 includes a third magnet 184 fixedly disposed on the movable seat 120, and two Hall sensors 185 fixedly disposed on the base 110. The third magnet 184 is disposed in an inclined direction relative to the front-rear direction (i.e., relative to the sliding shaft), and the two Hall sensors 185 are used to sense the magnetic field change of the third magnet 184 and transmit the sensing signal to the processor.

[0202] Specifically, an oblique groove is provided at the bottom of the movable seat 120 , and the third magnet 184 is fixedly disposed in the oblique groove, while the two Hall sensors 185 are fixed on the third circuit board 183 and fixedly mounted on the base 110 through the third circuit board 183 .

[0203] The present application provides a third magnet and two Hall sensors 185 that cooperate with each other to detect the position of the movable seat 120, so that the voice coil motor 100 provided by the present application has long-stroke position detection and closed-loop control capabilities. In addition, the sensing signal of the dual Hall sensors combined with the preset algorithm can accurately determine the moving position of the movable seat 120, thereby achieving precise focusing.

[0204] like Fig.10 As shown, the voice coil motor 100 further includes a fourth magnet 186 fixedly disposed at the bottom of the movable seat 120, and the fourth magnet 186 and the third magnet 184 are symmetrically disposed relative to the slide rail assembly. The fourth magnet 186 can balance the gravity on both sides of the movable seat 120 and the magnetic attraction with the slide shaft, thereby facilitating the stable and smooth sliding of the movable seat 120 and improving the performance of the voice coil motor 100.

[0205] like Figure 1-Figure 10As shown, in this embodiment, the first slide shaft 117 and the second slide shaft 118 are horizontally spaced and parallel to each other on both sides of the base 110, and correspondingly, the first slide groove 127 and the second slide groove 128 are parallel and spaced to each other at the bottom of the movable seat 120. In other embodiments, the slide shaft and the slide groove may also be arranged in other ways, which is not limited in this application. For example, Fig.11 , Fig.12 Another arrangement of the slide shaft and the slide groove is shown.

[0206] Fig.11 1 is another structural schematic diagram of the voice coil motor 100 provided in an embodiment of the present application with the cover removed. Fig.12 yes Fig.11 FIG. 1 is a schematic diagram of the installation structure of the movable seat 120 of the voice coil motor 100.

[0207] like Fig.11 , Fig.12 As shown, relative to the aforementioned Figure 1-Figure 10 In the illustrated embodiment, in this embodiment, the first sliding shaft 117 and the second sliding shaft 118 are arranged on the base 110 in parallel and spaced apart in the vertical direction.

[0208] Specifically, in this embodiment, the first sliding shaft 117 and the first sliding groove 127 are arranged in the same manner as in the aforementioned embodiment, and the second sliding shaft 118 is located at the upper end of the first sliding shaft 117, the two are arranged in parallel and spaced apart, and the first sliding shaft 117 and the second sliding shaft 118 are located on the same vertical plane.

[0209] Because the second slide shaft 118 is set at a different position, the second slide slot 128 is also set differently in this embodiment. Fig.12 As shown, the second slide groove 128 is in the shape of a through hole, and the through hole passes through the front and rear sides of the movable seat 120. The second slide shaft 118 is penetrated in the through hole and can slide relative to the through hole.

[0210] The shape and size of the through hole match the cross-sectional shape and size of the second slide shaft 118. In this embodiment, the cross-sectional shape of the second slide shaft 118 is circular, and correspondingly, the shape of the through hole is also circular. The size ratio of the through hole is larger than the size of the second slide shaft 118, which can ensure that the second slide shaft 118 can smoothly penetrate into the through hole on the one hand, and on the other hand, it is necessary to ensure that the movable seat 120 and the second slide shaft 118 generate movements other than forward and backward sliding, such as relative jumping or swinging.

[0211] exist Figure 1-Figure 10 , Figure 11-Figure 12 In the illustrated embodiment, the electromagnetic drive assembly is disposed on two sides of the movable seat 120. In other embodiments, the electromagnetic drive assembly may also be disposed at other locations, which is not limited in the present application. Figure 13-Figure 15In the illustrated embodiment, the electromagnetic drive assembly may also be disposed at the bottom of the movable seat 120 .

[0212] Fig.13 This is a schematic diagram of the structure of another example of the voice coil motor provided in an embodiment of the present application with the cover removed. Fig.14 yes Fig.13 The structure of the voice coil motor is shown in the figure. Fig.15 yes Fig.13 The structure diagram of the electromagnetic driving assembly of the voice coil motor driving the movable seat to move is shown.

[0213] like Figure 13-Figure 15 As shown, the electromagnetic drive assembly is disposed at the bottom of the movable seat 120. In order to ensure that the electromagnetic drive assembly can smoothly drive the movable seat 120 to slide forward and backward (without detaching from the base 110), the present embodiment also adjusts the arrangement of the sliding shaft and the sliding groove.

[0214] Specifically, in this embodiment, the first sliding shaft 117 and the second sliding shaft 118 are horizontally spaced and arranged in parallel on both sides of the base 110, the first sliding groove 127 and the second sliding groove 128 are both closed through holes, and are parallel and spaced apart from each other inside the movable seat 120, the first sliding groove 127 and the second sliding groove 128 horizontally penetrate the front and rear sides of the movable seat 120, the first sliding shaft 117 and the second sliding shaft 118 are correspondingly arranged in the first sliding groove 127 and the second sliding groove 128, and can produce relative sliding.

[0215] like Fig.14 , 15 As shown, the first electromagnetic drive assembly 130 and the second electromagnetic drive assembly 140 are both disposed between the movable seat 120 and the base 110, and are located on the left and right sides of the bottom of the movable seat 120. The first electromagnetic drive assembly 130 is located on one side of the first sliding shaft 117, and the second electromagnetic drive assembly 140 is located on the other side of the second sliding shaft 118. The first electromagnetic drive assembly 130 and the second electromagnetic drive assembly 140 work independently without affecting each other.

[0216] The bottom of the movable seat 120 is provided with a groove, and the first magnet 131 and the second magnet 141 are respectively installed in the groove, and the first coil 132 is located at the bottom of the first magnet 131, and the two are arranged parallel and opposite. The second coil 142 is located at the bottom of the second magnet 141, and the two are also arranged parallel and opposite.

[0217] like Fig.14 , Fig.15As shown, in order to achieve electrical connection, the first coil 132 and the second coil 142 are fixedly mounted on the fourth circuit board 187. The fourth circuit board 187 is "L" shaped, and a magnetoresistive sensor 182 is mounted on the front end. The magnetoresistive sensor 182 is used to sense the magnetic field change of the magnetic grid 181 set in the groove on the side of the movable seat 120. The rear end of the fourth circuit board 187 is provided with a connection terminal or a connector, and passes through the housing of the voice coil motor 100 to achieve electrical connection with an external device (such as a processor).

[0218] exist Figure 1-Figure 10 , Figure 11-Figure 12 , Figure 13-Figure 15 In the embodiment shown, the magnet and the coil in the electromagnetic drive assembly are arranged parallel to each other. In other embodiments, the electromagnetic drive assembly can also be arranged in other ways, which is not limited in this application. Fig.16 In the illustrated embodiment, the magnets and coils in the electromagnetic drive assembly may also be arranged vertically.

[0219] Fig.16 It is a structural schematic diagram of an installation structure of an electromagnetic drive component. Fig.16 Only the first electromagnetic drive assembly 130 is shown in the figure, and the present embodiment will take the first electromagnetic drive assembly 130 as an example to introduce the arrangement of the electromagnetic drive assembly, while the second electromagnetic drive assembly 140 not shown in the figure can be symmetrically arranged on the other side of the movable seat 120 in the same manner as the first electromagnetic drive assembly 130. The arrangement of the second electromagnetic drive assembly 140 will not be described in detail in the present embodiment, and can be understood by referring to the arrangement of the first electromagnetic drive assembly 130.

[0220] like Fig.16 As shown, the movable seat 120 is sleeved on the outside of the first sliding shaft 117 and the second sliding shaft 118 , and the first electromagnetic driving component 130 is used to drive the movable seat 120 to slide relative to the first sliding shaft 117 and the second sliding shaft 118 .

[0221] The first electromagnetic drive assembly 130 includes a first coil 132, a fifth magnet 135, and a sixth magnet 136. The fifth magnet 135 and the sixth magnet 136 are opposite to each other and are arranged in parallel and spaced apart. The first coil 132 is vertically arranged between the fifth magnet 135 and the sixth magnet 136. The fifth magnet 135 and the sixth magnet 136 have the same magnetic polarity on the side facing the first coil 132. In other words, the magnetic polarity of the side of the fifth magnet 135 and the sixth magnet 136 opposite to each other is the same.

[0222] Specifically, Fig.16 As shown, the polarities of the fifth magnet 135 and the sixth magnet 136 facing the side of the first coil 132 are the same, for example, both are N poles or both are S poles. According to the left-hand rule, Fig.16 The electromagnetic forces acting on the upper and lower sides of the first coil 132 perpendicular to the paper surface are in the same direction, to the left or to the right at the same time, thereby driving the movable seat 120 to slide forward and backward.

[0223] Contains Fig.16 The voice coil motor of the electromagnetic drive assembly shown can be a moving magnet type or a moving coil type, and this application does not limit this.

[0224] Optionally, include Fig.16 The voice coil motor of the electromagnetic drive assembly shown may be a moving magnet voice coil motor. In this case, the fifth magnet 135 and the sixth magnet 136 are fixedly disposed on the movable seat 120 , and the first coil 132 is fixedly disposed on the base 110 .

[0225] For example, a groove may be opened on the side of the movable seat 120, the fifth magnet 135 and the sixth magnet 136 are fixedly disposed in the groove, and the first coil 132 is fixedly disposed on the base 110 through the side parallel to the paper direction and close to the outside.

[0226] like Fig.16 As shown, the electromagnetic drive assembly also includes a magnetic frame 137, which is coated on the outer periphery of the fifth magnet 135 and the sixth magnet 136, and can enhance the magnetic field strength between the fifth magnet 135 and the sixth magnet 136, thereby enhancing the coil output.

[0227] Furthermore, a magnetic plug 138 is fixedly disposed between the fifth magnet 135 and the sixth magnet 136 in the magnetic frame 137, and the first coil 132 is sleeved on the outer periphery of the magnetic plug 138. The magnetic plug 138 can also enhance the magnetic field strength, thereby achieving the purpose of enhancing the coil output.

[0228] Optionally, include Fig.16 The voice coil motor of the electromagnetic drive assembly shown may also be a dynamic voice coil motor. In this case, the fifth magnet 135 and the sixth magnet 136 are fixedly disposed on the base 110 , and the first coil 132 is fixedly disposed on the movable base 120 .

[0229] Compared with the aforementioned embodiments, the coil of the electromagnetic drive assembly provided in this embodiment is in a stronger magnetic field and can provide a greater driving force.

[0230] Fig.17 This is a schematic diagram of another installation structure of the electromagnetic drive assembly. Fig.16 In the embodiment shown, in this embodiment, the first coil 132 is sleeved on the outer circumference of the fifth magnet 135 .

[0231] Specifically, Fig.17As shown, in this embodiment, the first electromagnetic drive component 130 includes a first coil 132, a fifth magnet 135, and a sixth magnet 136. The fifth magnet 135 and the sixth magnet 136 are opposite to each other and are arranged in parallel and spaced apart. The first coil 132 is sleeved on the outer periphery of the fifth magnet 135 and is perpendicular to the fifth magnet. The magnetic poles of the sides of the fifth magnet 135 and the sixth magnet 136 that are opposite to each other are opposite in polarity.

[0232] For example, the polarities of the sides of the fifth magnet 135 and the sixth magnet 136 facing each other are opposite, one is an N pole and the other is an S pole. According to the left-hand rule, Fig.17 The side of the first coil 132 between the two magnets will be subjected to an electromagnetic force to the left or right, thereby driving the movable seat 120 to slide forward and backward.

[0233] Contains Fig.17 The voice coil motor of the electromagnetic drive assembly shown can be a moving magnet type or a moving coil type, and this application does not limit this.

[0234] Optionally, include Fig.17 The voice coil motor of the electromagnetic drive assembly shown may be a moving magnet voice coil motor. In this case, the fifth magnet 135 and the sixth magnet 136 are fixedly disposed on the movable seat 120 , and the first coil 132 is fixedly disposed on the base 110 .

[0235] Optionally, include Fig.17 The voice coil motor of the electromagnetic drive assembly shown may also be a dynamic voice coil motor. In this case, the fifth magnet 135 and the sixth magnet 136 are fixedly disposed on the base 110 , and the first coil 132 is fixedly disposed on the movable base 120 .

[0236] like Fig.17 As shown, the magnetic plug 138 is located outside the fifth magnet 135 and inside the first coil 132, that is, the first coil 132 is also sleeved on the outer periphery of the magnetic plug 138. Through the above arrangement, the magnetic field strength between the magnets can be enhanced, thereby achieving the purpose of enhancing the coil output.

[0237] On the other hand, the embodiment of the present application also provides a camera module, Fig.18 It is a structural schematic diagram of the camera module 200 provided in an embodiment of the present application.

[0238] like Fig.18 As shown, the camera module 200 includes a first lens 230 and a voice coil motor 100 provided in any of the aforementioned embodiments, and the voice coil motor 100 is used to drive the first lens 230 to move to achieve optical focus.

[0239] Optionally, the camera module 200 further includes a second lens 220 disposed in an object side direction of the first lens 230 , and an image sensor 250 disposed in an image side direction of the first lens 230 .

[0240] For example, the second lens 220 may be fixedly installed in the second lens installation groove 114 of the voice coil motor 100 .

[0241] For example, the image sensor 250 can be a complementary metal-oxide semiconductor (CMOS) image sensor or a charge coupled device (CCD) image sensor. The image sensor 250 is mainly used to perform photoelectric conversion and analog signal / digital signal (Analog / Digital, A / D) conversion on the optical signal of light, thereby outputting image data for display on a display unit such as a display screen.

[0242] Optionally, the camera module 200 further includes a reflective element 210 disposed in the object side direction of the second lens 220. That is, the camera module 200 may be a periscope camera module.

[0243] For example, the reflective element 210 may be a triangular prism or a reflective mirror.

[0244] Optionally, an infrared filter 240 is further provided between the first lens 230 and the image sensor 250. By providing the infrared filter 240, infrared rays can be cut off, filtered, etc., so that the imaging quality can be improved. The infrared filter 240 can be, for example, a white glass filter or a blue glass filter.

[0245] Since the camera module 200 adopts the voice coil motor 100 provided by any of the above embodiments, the camera module 200 also has the technical effects corresponding to the voice coil motor 100, which will not be described in detail here.

[0246] On the other hand, the embodiment of the present application further provides an electronic device, Fig.19 It is a schematic diagram of the structure of an electronic device 300 provided in an embodiment of the present application.

[0247] Fig.19 Parts (a) and (b) are respectively a front view and a back view of the electronic device 300. Fig.19As shown, the electronic device 300 includes the camera module 200 provided in the aforementioned embodiment, and further includes a shell 310 and a display screen 320. The display screen 320 is installed on the shell 310. An accommodating space is formed in the shell 310. The camera module 200 can be installed in the accommodating space. The display screen 320 can be used to display pictures or videos taken by the camera module 200.

[0248] Optionally, the housing 310 may be a metal housing, such as magnesium alloy, stainless steel, etc. In addition, it may also be a plastic housing, a glass housing, a ceramic housing, etc., but is not limited thereto.

[0249] Optionally, the display screen 320 may be a light emitting diode (LED) display screen, a liquid crystal display (LCD) display screen, or an organic light-emitting diode (OLED) display screen, but is not limited thereto.

[0250] Optionally, the housing 310 may further include other components, such as a battery, a flash, a fingerprint recognition module, an earpiece, a circuit board, a sensor, etc., but is not limited thereto.

[0251] Optionally, the electronic device 300 may be a terminal device with a video or photographing function, such as a mobile phone, a tablet computer, a laptop computer, a video camera, a video recorder, a camera, an intelligent robot, a vehicle-mounted monitoring device, or other devices with a video or photographing function.

[0252] Since the electronic device 300 adopts the camera module 200 provided in the above embodiment, the electronic device 300 also has the technical effects corresponding to the camera module 200, which will not be described in detail here.

[0253] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A voice coil motor, characterized in that: include: Base (110); Slide rail assembly; A movable seat (120) is used to carry the first lens and is slidably disposed on the base (110) via the slide rail assembly; A first electromagnetic drive assembly (130) and a second electromagnetic drive assembly (140) are used to provide a driving force to the movable seat (120) so as to drive the movable seat (120) to slide relative to the base (110); the first electromagnetic drive assembly (130) and the second electromagnetic drive assembly (140) are respectively arranged on both sides of the slide rail assembly; The slide rail assembly comprises a first slide shaft (117) and a second slide shaft (118) which are arranged on the base (110) in parallel and at intervals, and a first slide groove (127) and a second slide groove (128) which are opened at the bottom of the movable seat (120); The first sliding shaft (117) is slidably disposed in the first sliding groove (127), and the second sliding shaft (118) is slidably disposed in the second sliding groove (128).

2. The voice coil motor according to claim 1, characterized in that: The first sliding groove (127) is a V-shaped groove, the second sliding groove is a U-shaped groove, and the groove width of the U-shaped groove is greater than the width of the second sliding shaft (118).

3. The voice coil motor according to claim 1 or 2, characterized in that: The first electromagnetic drive component (130) comprises a first magnet (131) and a first coil (132) which are arranged parallel to and opposite to each other; The second electromagnetic drive component (140) comprises a second magnet (141) and a second coil (142) which are arranged parallel to and opposite to each other; The first magnet (131) and the second magnet (141) are fixedly arranged on two opposite sides of the movable seat (120), and the first coil (132) and the second coil (142) are fixedly arranged on the base (110).

4. The voice coil motor according to claim 3, characterized in that: The first magnet (131) and the second magnet (141) both have N poles and S poles alternately arranged along the front-to-back direction; The N pole and S pole of the first magnet (131) face the first coil (132), and the N pole and S pole of the second magnet (141) face the second coil (142).

5. The voice coil motor according to claim 4, characterized in that: The first magnet (131) is composed of a plurality of independent magnets, or the first magnet (131) is an integrated magnetized structure; The second magnet (141) is composed of a plurality of independent magnets, or the second magnet (141) is an integrated magnetized structure.

6. The voice coil motor according to any one of claims 3 to 5, characterized in that: The first coil (132) is electrically connected to the first circuit board (133), and is fixedly mounted on the base (110) via the first circuit board (133); The second coil (142) is electrically connected to the second circuit board (143), and is fixedly mounted on the base (110) via the second circuit board (143); The first circuit board (133) and the second circuit board (143) are electrically connected via a connecting circuit board (143).

7. The voice coil motor according to any one of claims 3 to 6, characterized in that: The first sliding shaft (117) and the second sliding shaft (118) are made of magnetic conductive material, there is magnetic attraction between the first magnet (131) and the first sliding shaft (117), and there is magnetic attraction between the second magnet (141) and the second sliding shaft (118).

8. The voice coil motor according to any one of claims 1 to 7, characterized in that: The base (110) comprises a rear limit frame (112) located at the rear side of the slide rail assembly, and a front limit frame (113) located at the front side of the slide rail assembly, wherein the rear limit frame (112) and the front limit frame (113) are used to limit the sliding range of the movable seat (120) in the front-rear direction.

9. The voice coil motor according to claim 8, characterized in that: An extension portion (124) is protrudingly provided on one side of the movable seat (120) toward the rear limiting frame (112), and a positioning slot (116) for inserting the extension portion (124) is formed on the rear limiting frame (112).

10. The voice coil motor according to claim 8 or 9, characterized in that: An elastic buffer (115) is provided on the side of the rear limiting frame (112) facing the movable seat (120), and / or An elastic buffer (115) is provided on the side of the front limit frame (113) facing the movable seat (120).

11. The voice coil motor according to claim 8 or 9, characterized in that: An elastic buffer (115) is provided on the side of the movable seat (120) facing the limiting frame (112), and / or An elastic buffer (115) is provided on the side of the movable seat (120) facing the front limit frame (113).

12. The voice coil motor according to any one of claims 8 to 11, characterized in that: The rear limiting frame (112) is provided with a second lens mounting groove (123) for mounting a second lens.

13. The voice coil motor according to any one of claims 3 to 7, characterized in that: The voice coil motor further comprises a displacement sensor assembly (180) for sensing the position of the movable seat (120), and a processor for receiving a sensing signal from the displacement sensor assembly (180) and controlling the current of the first coil (132) and the second coil (142).

14. The voice coil motor according to claim 13, characterized in that: The displacement sensor assembly (180) comprises a magnetic grid (181) fixedly arranged on the movable seat (120), and a magnetoresistive sensor (182) fixedly arranged on the base (110); the magnetoresistive sensor (182) is used to sense the magnetic field change of the magnetic grid (181) and transmit the sensing signal to the processor.

15. The voice coil motor according to claim 13, characterized in that: The displacement sensor assembly (180) comprises a third magnet (184) fixedly arranged on the movable seat (120), and two Hall sensors (185) fixedly arranged on the base (110); The magnetic pole direction of the third magnet (184) is tilted relative to the front-rear direction, and the two Hall sensors (185) are used to sense the magnetic field changes of the third magnet (184) and transmit the sensing signals to the processor.

16. The voice coil motor according to claim 15, characterized in that: The voice coil motor also includes a fourth magnet (186) fixedly arranged at the bottom of the movable seat (120), and the fourth magnet (186) and the third magnet (184) are symmetrically arranged relative to the slide rail assembly.

17. The voice coil motor according to any one of claims 3 to 7, characterized in that: The movable seat (120) comprises two mounting brackets (121) and a metal connecting piece (122), and the two mounting brackets (121) are fixedly connected via the metal connecting piece (122).

18. The voice coil motor according to claim 17, characterized in that: The metal connecting piece (122) comprises two magnetic conductive sheets (1221) and a supporting bottom (1222), and the two magnetic conductive sheets (1221) are fixedly connected via the supporting bottom (1222); The two magnetic conductive sheets (1221) are respectively fixed on the two mounting brackets (121), and are respectively located on the inner sides of the first magnet (131) and the second magnet (141).

19. The voice coil motor according to claim 18, characterized in that: The metal connecting piece (122) is made of magnetic conductive material through an integral molding process.

20. The voice coil motor according to any one of claims 1 to 2, characterized in that: The first electromagnetic drive component (130) comprises a first coil (132), a fifth magnet (135) and a sixth magnet (136); The fifth magnet (135) and the sixth magnet (136) are arranged opposite to each other and in parallel with each other, the first coil (132) is arranged vertically between the fifth magnet (135) and the sixth magnet (136), and the magnetic poles of the sides of the fifth magnet (135) and the sixth magnet (136) that are opposite to each other have the same polarity.

21. The voice coil motor according to any one of claims 1 to 2, characterized in that: The first electromagnetic drive component (130) comprises a first coil (132), a fifth magnet (135) and a sixth magnet (136); The fifth magnet (135) and the sixth magnet (136) are opposite to each other and are arranged in parallel with each other. The first coil (132) is sleeved on the outer periphery of the fifth magnet (135) and is perpendicular to the fifth magnet (135). The magnetic poles of the sides of the fifth magnet (135) and the sixth magnet (136) that are opposite to each other are opposite in polarity.

22. A camera module, characterized in that: It comprises a first lens (230) and a voice coil motor as described in any one of claims 1 to 21, wherein the voice coil motor is used to drive the first lens (230) to move.

23. The camera module according to claim 22, characterized in that: The camera module also includes a second lens (220) arranged in the object side direction of the first lens (230), and an image sensor (250) arranged in the image side direction of the first lens (230).

24. The camera module according to claim 23, characterized in that: The camera module also includes a reflective element (210) arranged in the object side direction of the second lens (220).

25. The camera module according to claim 23 or 24, characterized in that: An infrared filter (240) is also provided between the first lens (230) and the image sensor (250).

26. An electronic device, characterized in that: Comprising a camera module as described in any one of claims 22-25.

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