Magnetic levitation components, voice coil motors, and micro-pan-tilt drive devices

Abstract

The present invention provides a voice coil motor (VCM) mounted on a micro-gimbal support. The optical axis of the VCM lens is defined as the Z-axis. The VCM comprises a first magnetic levitation assembly and a second magnetic levitation assembly. The first magnetic levitation assembly comprises a first magnet, a first coil disposed on the emitting surface of the first magnet, and a first magnetic conductor disposed on the side of the first coil. The second magnetic levitation assembly comprises a second magnet, a second coil disposed on the emitting surface of the second magnet, and a second magnetic conductor disposed on the side of the second coil. The emitting surfaces of the first and second magnets are curved or inclined surfaces of varying thicknesses. When the first and second coils are energized, the first and second coils, or the first and second magnets, move in a predetermined direction, while the first and second magnetic conductors, or the first and second magnets, remain in a magnetic levitation state. This VCM is compact, simple in structure, and can move in a predetermined direction, thereby achieving optical micro-gimbal stabilization.

Description

Technical Field

[0001] The present invention relates to the field of electronic equipment, and in particular to a magnetic levitation component for a voice coil motor, a voice coil motor, a micro pan-tilt platform driving device having the voice coil motor, and electronic equipment and an optical system having the micro pan-tilt platform driving device. Background Art

[0002] Voice coil motors (VCMs), characterized by high-frequency response and high precision, are primarily used in mobile phone cameras. Their primary operating principle is to control the tension of a spring by varying the DC current flowing through the motor's coil within a permanent magnetic field, thereby driving the upward and downward movement. Traditional VCMs are widely used in mobile phone cameras for autofocus (AF), which adjusts the focus along the optical axis.

[0003] With the diversification of camera phones, some cameras with optical image stabilization (OIS) are placing increasingly stringent demands on the drivers used. A handheld gimbal is a shooting aid used to mount and secure a camera, using external physical image stabilization to stabilize the user's footage. However, due to the limited internal space of mobile phones, this type of gimbal cannot be applied to thin and lightweight electronic devices such as mobile phones.

[0004] Currently, there are micro-gimbals for mobile phones on the market. With its support, although its anti-shake angle (+ / -3 0 ) is better than the OIS specifications of ordinary mobile phones (+ / -1 0 ) is three times larger. However, in the increasingly thin mobile phones and other electronic devices, the thickness of the micro gimbal is still difficult to meet future needs. Moreover, its anti-shake function cannot meet the future wide angle (+ / -8 0 ) anti-shake requirements.

[0005] In addition, the current micro gimbal suspension still adopts a contact ball concept or a double S-shaped soft plate support design, which makes the response speed slow or difficult to assemble, and the anti-shake effect is not good.

[0006] Therefore, an improved voice coil motor, a micro pan-tilt platform driving device having the voice coil motor, and an electronic device having the micro pan-tilt platform driving device are urgently needed to overcome the above-mentioned defects. Summary of the Invention

[0007] An object of the present invention is to provide a magnetic levitation assembly for a voice coil motor, which has a small size, a simple structure, and can move in a predetermined direction.

[0008] Another object of the present invention is to provide a voice coil motor that is small in size, simple in structure, and can move in a predetermined direction to achieve an optical image stabilization function.

[0009] Another object of the present invention is to provide a micro-pan-tilt drive device that is small in size, simple in structure, and can move in a predetermined direction to achieve an optical image stabilization function.

[0010] Another object of the present invention is to provide an electronic device with a camera that is small in size, simple in structure, has automatic focus, and can move in a predetermined direction to achieve optical image stabilization.

[0011] Another object of the present invention is to provide an electro-optical system with a camera that is small in size, simple in structure, has automatic focus, and can move in a predetermined direction to achieve optical image stabilization.

[0012] To achieve the above-mentioned objectives, the present invention provides a magnetic levitation assembly for a voice coil motor, wherein the optical axis direction of the lens of the voice coil motor is defined as the Z-axis direction, and the assembly includes a magnet, a coil arranged on the emitting surface of the magnet, and a magnetic conductor arranged on the side of the coil, wherein the emitting surface of the first magnet is a curved surface or an inclined surface with different thicknesses; when the coil is energized, the coil or the magnet moves in a predetermined direction, and the magnetic conductor or the magnet maintains a magnetic levitation state.

[0013] Preferably, the magnet is a bipolar magnet, the number of the magnets is two, the north and south poles of the two magnets are arranged along the X-axis or Y-axis direction, the magnetic conductor is located between the magnet and the coil and faces the emitting surface of one of the magnets and the end of the coil. When the coil is energized, the coil or the magnet moves in the X-axis direction or the Y-axis direction.

[0014] Preferably, the magnet is a bipolar magnet, the number of the magnets is two, the north and south poles of the two magnets are arranged along the Z-axis direction, the magnetic conductor is located between the magnet and the coil and faces the junction of the emitting surfaces of the two magnets and the middle of the coil. When the coil is energized, the two magnets or the coil move in the X-axis direction or the Y-axis direction.

[0015] Preferably, the magnet is a unipolar magnet, the number of the magnet is one, and the magnetic conductor is located between the magnet and the coil and faces the middle of the emitting surface of the magnet and the end of the coil.

[0016] Preferably, the magnet is a unipolar or bipolar magnet, the number of the magnet is one, the coil is arc-shaped and is located between the emitting surface of the magnet and the magnetic conductor, the two magnetic conductors are respectively located at the two ends of the coil, and when the coil is energized, the coil rotates in the X-axis direction or the Y-axis direction.

[0017] The present invention provides a voice coil motor, disposed on the side of a micro gimbal support, wherein the optical axis direction of the lens of the voice coil motor is defined as the Z-axis direction. The voice coil motor comprises a first magnetic levitation assembly and a second magnetic levitation assembly. The first magnetic levitation assembly comprises a first magnet, a first coil disposed on the emitting surface of the first magnet, and a first magnetic conductor disposed on the side of the first coil. The second magnetic levitation assembly comprises a second magnet, a second coil disposed on the emitting surface of the second magnet, and a second magnetic conductor disposed on the side of the second coil. The emitting surfaces of the first and second magnets are curved surfaces or inclined surfaces with different thicknesses. When the first and second coils are energized, the first and second coils, or the first and second magnets, move in a predetermined direction, and the first and second magnetic conductors, or the first and second magnets, remain in a magnetic levitation state.

[0018] Preferably, the two first magnetic levitation components are distributed on a diagonal line of the micro gimbal support and the north and south poles of the two first magnets in each first magnetic levitation component are arranged along the X-axis direction, the second magnetic levitation components are distributed on another diagonal line of the micro gimbal support and the north and south poles of the two second magnets in each second magnetic levitation component are arranged along the Y-axis direction, the first magnetic conductor is located between the first magnet and the first coil and faces the emitting surface of one of the first magnets and the end of the first coil, the second magnetic conductor is located between the second magnet and the second coil and faces the emitting surface of one of the second magnets and the end of the second coil, when the first coil and the second coil are energized, the first coil moves in the X-axis direction and the second coil moves in the Y-axis direction, and the first magnet and the second magnet are both bipolar magnets.

[0019] Preferably, the two first magnetic levitation components are distributed in the Y-axis direction of the micro gimbal support and the north and south poles of the two first magnets in each first magnetic levitation component are arranged along the Z-axis direction, the two second magnetic levitation components are distributed in the X-axis direction of the micro gimbal support and the north and south poles of the two second magnets in each second magnetic levitation component are arranged along the Z-axis direction, the first magnetic conductor is located between the first magnet and the first coil and faces the junction of the emitting surfaces of the two first magnets and the middle of the first coil, the second magnetic conductor is located between the second magnet and the second coil and faces the junction of the emitting surfaces of the two second magnets and the middle of the second coil, when the first coil and the second coil are energized, the first magnet rotates around the X-axis direction and the second magnet rotates around the Y-axis direction, and the first magnet and the second magnet are both bipolar magnets.

[0020] Preferably, the two first magnetic levitation components are distributed in the X-axis direction of the micro gimbal support, and the two second magnetic levitation components are distributed in the Y-axis direction of the micro gimbal support. Each of the first magnetic levitation components includes a single first magnet, and each of the second magnetic levitation components includes a single second magnet. The first magnetic conductor is located between the first magnet and the first coil and faces the emitting surface of the first magnet and the end of the first coil. The second magnetic conductor is located between the second magnet and the second coil and faces the emitting surface of the second magnet and the end of the second coil. When the first coil and the second coil are energized, the first coil rotates around the Y-axis direction and the second coil rotates around the X-axis direction. The first magnet and the second magnet can be monopolar or bipolar magnets.

[0021] Preferably, the two first magnetic levitation components are distributed in the Y-axis direction of the micro gimbal support, and the two second magnetic levitation components are distributed in the X-axis direction of the micro gimbal support. Each of the first magnetic levitation components includes a single first magnet, the first coil, and two first magnetic conductors located at both ends of the first coil. Each of the second magnetic levitation components includes a single second magnet, the second coil, and two second magnetic conductors located at both ends of the second coil. The first coil is arc-shaped and is located between the emitting surface of the first magnet and the first magnetic conductor. The second coil is arc-shaped and is located between the emitting surface of the second magnet and the second magnetic conductor. When the first coil and the second coil are energized, the first coil rotates around the Y-axis direction and the second coil rotates around the X-axis direction. The first magnet and the second magnet can be monopolar or bipolar magnets.

[0022] The present invention provides a micro-pan-tilt platform driving device, comprising a micro-pan-tilt platform support for carrying at least one auto-focus camera module and a voice coil motor for driving the micro-pan-tilt platform support.

[0023] Compared to the prior art, the structure of the voice coil motor of the present invention generates an interaction force when the first and second coils are energized, driven by magnets. This causes the two first coils or first magnets to move in the X-axis direction, providing X-direction optical image stabilization driving force for the autofocus camera module on the micro-gimbal support. The two second coils or second magnets to move in the Y-axis direction, providing Y-direction optical image stabilization driving force for the autofocus camera module on the micro-gimbal support. This achieves the two-dimensional optical image stabilization function of the voice coil motor. Furthermore, the magnetic conductor can remain stably in a magnetically levitated state, allowing it to more accurately maintain this intermediate position. This type of magnetic levitation suspension is more convenient to assemble and has a simpler structure than traditional physical suspension methods, such as those using elastic wires, shrapnel, or balls. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1FIG. 1 is a partial schematic diagram of a first embodiment of a (dynamic translating) voice coil motor according to the present invention.

[0025] Figure 2 for Figure 1 Schematic diagram of the magnetic levitation assembly used in the voice coil motor shown.

[0026] Figure 3 FIG. 2 is a partial schematic diagram of a second embodiment of a (dynamic translating) voice coil motor according to the present invention.

[0027] Figure 4 for Figure 3 Schematic diagram of the magnetic levitation assembly used in the voice coil motor shown.

[0028] Figure 5a-5b for Figure 3 The partial assembly diagram of the voice coil motor is shown.

[0029] Figure 6 This is a schematic diagram of the first embodiment of the micro-pan-tilt drive device of the present invention, which adopts Figure 3 The voice coil motor shown.

[0030] Figure 7 FIG. 2 is a partial schematic diagram of a second embodiment of a (moving magnet rotary) voice coil motor according to the present invention.

[0031] Figure 8 for Figure 7 Schematic diagram of the magnetic levitation assembly used in the voice coil motor shown.

[0032] Figure 9 for Figure 7 The partial assembly diagram of the voice coil motor is shown.

[0033] Figure 10 This is a schematic diagram of the second embodiment of the micro-pan-tilt drive device of the present invention, which adopts Figure 7 The voice coil motor shown.

[0034] Figure 11 FIG. 1 is a partial schematic diagram of a third embodiment of a (dynamic rotary) voice coil motor according to the present invention.

[0035] Figure 12 for Figure 11 Schematic diagram of the magnetic levitation assembly used in the voice coil motor shown.

[0036] Figure 13 FIG. 1 is a partial schematic diagram of a fourth embodiment of a (dynamic rotary) voice coil motor according to the present invention.

[0037] Figures 14a-14b for Figure 13 Schematic diagram of the magnetic levitation assembly used in the voice coil motor shown.

[0038] Figure 15 (a)-15(j) shows a schematic diagram of the relative positions of various magnet shapes and magnetic conductors in the magnetic levitation assembly of the present invention. DETAILED DESCRIPTION

[0039] Several preferred embodiments of the present invention will be described below with reference to the accompanying drawings, wherein like reference numerals represent like components throughout the various figures. The essence of the present invention lies in providing a voice coil motor (VCM) with a compact size, simple structure, and the ability to move in a predetermined direction to achieve optical image stabilization, and its application. The VCM is suitable for driving general autofocus camera modules, particularly those in thin and lightweight electronic devices such as mobile phones, i.e., in a "micro-pan-tilt" device.

[0040] Figure 1 This is a partial schematic diagram of the voice coil motor 10 of this embodiment. It only shows the configuration structure of the magnetic levitation components in the voice coil motor around the micro-pan-tilt platform support (not shown in the figure), and the other components of the voice coil motor are not shown. Specifically, the voice coil motor 10 includes two first magnetic levitation components 11 and two second magnetic levitation components 12. The two first magnetic levitation components 11 are distributed on the diagonal line of the micro-pan-tilt platform support, and the two second magnetic levitation components 12 are distributed on the other diagonal line of the micro-pan-tilt platform support. Figure 2 As shown, the first magnetic levitation assembly 11 includes a first magnet 111, a first coil 112 disposed on the emitting surface of the first magnet 111, and a first magnetic conductor 113 disposed on the side of the first coil 112. In this embodiment, the first magnetic levitation assembly 11 includes two first magnets 111 arranged side by side, and the north and south poles of the two first magnets 111 are arranged along the X-axis direction (see Figure 1 ). Combined Figure 1 and Figure 2 The first coil 112 is disposed on the emitting surface of the first magnet 111. The emitting surface of the first magnet 111 is a curved surface. As shown in the figure, the emitting surface is arc-shaped. The first magnetic conductor 113 is located between the first magnet 111 and the first coil 112 and is directly opposite to the emitting surface of one of the first magnets 111 and the end of the first coil (i.e. Figure 2 ). Preferably, the first magnetic conductor 113 is aligned with the highest point of the emitting surface. Similarly, the second magnetic levitation component 12 includes a second magnet 121, a second coil 122 provided on the emitting surface of the second magnet 121, and a second magnetic conductor 123 provided on the side of the second coil 122. The second magnetic conductor is located between the second magnet 121 and the second coil 122 and faces the emitting surface of one of the second magnets 121 and the end of the second coil 122. Unlike the first magnetic levitation component 11, the north and south poles of the two side-by-side second magnets 121 in the second magnetic levitation component 12 are arranged along the Y-axis direction (see Figure 1 In this embodiment, the first magnet 111 and the second magnet 121 are both bipolar magnets.

[0041] In this embodiment, the first and second magnets 111 and 121 can be fixed to form a dynamic voice coil motor. When the first and second coils are energized, the magnets generate an interaction force, causing the two first coils to generate unidirectional driving forces F1 and F2, respectively, thereby moving in the X-axis direction and providing X-direction optical image stabilization driving force for the autofocus camera module supported by the micro-gimbal. The two second coils generate unidirectional driving forces F3 and F4, respectively, thereby moving in the Y-axis direction and providing Y-direction optical image stabilization driving force for the autofocus camera module supported by the micro-gimbal. This achieves the two-dimensional optical image stabilization function of the voice coil motor. Preferably, the first unidirectional resultant force F1 / F2 and the second unidirectional resultant force F3 / F4 are both symmetrically driven, and the resultant forces can pass through the center of gravity of the movable part, resulting in a more balanced driving force and reduced friction.

[0042] The magnetizers face the curved emitting surfaces of the magnets (the first magnetizer faces the curved emitting surface of the first magnet, and the second magnetizer faces the curved emitting surface of the second magnet). This allows the magnetizers to remain in a stable magnetic levitation state, more accurately maintaining the intermediate position. This magnetic levitation suspension method is easier to assemble and has a simpler structure than traditional physical suspension methods such as elastic wire, springs, or balls.

[0043] Figure 3-5b The second embodiment of the moving coil voice coil motor 10 ′ is shown. Figure 1-2 On the basis of the embodiment shown, another set of bipolar magnets is added to the first and second magnetic levitation components 11' and 12'. Figure 3 ,4, that is, a coil 112 cooperates with two groups of first magnets 111, 111', and the first coil 112 is located on both sides of the two groups of first magnets 111, 111', thereby increasing the magnetic field density passing through the first coil 112 and increasing the driving force. Similarly, the second coil 122 is located on both sides of the two groups of second magnets 121, 121', thereby increasing the magnetic field density passing through the second coil 121 and increasing the driving force. Figure 4As shown, the two first magnetic conductors 113 and 113' are symmetrically located on both sides of the first coil 112. Since the suction forces on both sides are consistent, the first magnetic conductors 113 and 113' can still be magnetically levitated in the middle of the arc-shaped emitting surfaces on both sides. Similarly, the structure of the second magnetic levitation component 12' corresponds to the first magnetic levitation component 11' and will not be described in detail. When the first coil 112 and the second coil 122 are energized, an interaction force is generated under the action of the magnets, causing the two first coils 112 to generate driving forces F1 and F2 in the same direction, respectively, thereby moving in the X-axis direction, providing the autofocus camera module on the micro-gimbal support with an optical image stabilization driving force in the X direction; the two second coils 122 generate driving forces F3 and F4 in the same direction, respectively, thereby moving in the Y-axis direction, providing the autofocus camera module on the micro-gimbal support with an optical image stabilization driving force in the Y direction. The driving force of this embodiment is stronger than that of the first embodiment.

[0044] Figure 5a-5b for Figure 3 The partial assembly diagram of the voice coil motor 10 ′ is shown. The voice coil motor 10 ′ further includes a micro pan-tilt support 13 , a circuit board 17 , and a housing 19 .

[0045] Figure 6 This is a schematic diagram of a first embodiment of a micro-pan-tilt drive device 1 according to the present invention. An autofocus camera module with a lens 14 is mounted on a micro-pan-tilt mount 13, forming the autofocus camera module drive device 1, or "micro-pan-tilt." This autofocus camera module includes an actuator (not shown) that moves the lens 14 along the optical axis (i.e., the Z direction), achieving optical autofocus. Combined with the aforementioned voice coil motor 10', this allows the autofocus camera module to move in the X and Y directions, achieving dual-axis translation for image stabilization and anti-shake.

[0046] Figure 7-10 Demonstrate the moving magnet rotary voice coil motor and its applications. Figure 7 Only the configuration of the magnetic levitation components around the micro gimbal support (not shown) is shown, and the other components of the voice coil motor are not shown.

[0047] Specifically, the voice coil motor 20 includes two first magnetic levitation components 21 and two second magnetic levitation components 22. The two first magnetic levitation components 21 are distributed on a pair of sides (Y-axis direction) of the micro-pan-tilt support (not shown), and the two second magnetic levitation components 22 are distributed on the other pair of sides (X-axis direction) of the micro-pan-tilt support. Figure 7 As shown, the first magnetic levitation assembly 21 includes a first magnet 211, a first coil 212 disposed on the emitting surface of the first magnet 211, and a first magnetic conductor 213 disposed on the side of the first coil 212. In this embodiment, the first magnetic levitation assembly 21 includes two first magnets 211, and the north and south poles of the two first magnets 211 are arranged along the Z axis (see Figure 8 ). Combined Figure 7 and Figure 8 The front of the first coil 212 is arranged on the emitting surface of the first magnet 211, and the emitting surface of the first magnet 211 is a curved surface. As shown in the figure, the emitting surface is arc-shaped. The first magnetic conductor 213 is located between the first magnet 211 and the first coil 212 and faces the joint of the emitting surfaces of the two first magnets 211 and the middle of the first coil 212 (i.e. Figure 8 (The middle position shown). Preferably, the emitting surfaces of the two first magnets 211 meet to form an arc-shaped highest point, and the first magnetic conductor 213 is aligned with the highest point. Similarly, the second magnetic levitation component 22 includes a second magnet 221, a second coil 222 disposed on the emitting surface of the second magnet 221, and a second magnetic conductor 223 disposed on the side of the second coil 222. The second magnetic conductor 223 is located between the second magnet 221 and the second coil 222 and faces the junction of the emitting surfaces of the two second magnets 221 and the middle of the second coil 222. In this embodiment, the first magnet 211 and the second magnet 221 are both bipolar magnets.

[0048] When the two first coils 212 located on the Y-axis are energized, the magnets generate an interaction force, causing the two first magnets 211 to generate antiparallel driving forces F1 and F2, respectively, thereby pushing the two first magnets 211 to rotate counterclockwise around the X-axis. During rotation, the first magnet pair is pulled back by the magnetic attraction of the first magnetizer 213, reversing clockwise to a position where the couple is in equilibrium. When the two second coils 222 located on the X-axis are energized, the magnets generate an interaction force, causing the two second magnets 221 to generate antiparallel driving forces F3 and F4, respectively, thereby pushing the two second magnets 221 to rotate clockwise around the Y-axis. During rotation, the second magnet pair 221 is pulled back by the magnetic attraction of the second magnetizer 223, reversing counterclockwise to a position where the couple is in equilibrium.

[0049] Figure 9 The connection between the micro-pan platform support 23 and the magnetic levitation components 21 and 22 is shown, and each magnet is fixedly connected to the micro-pan platform support 23. For example, by bonding, it rotates together with the micro-pan platform support 23 when driven. Figure 10 The micro-pan-tilt drive device is shown. The lens 24 in the autofocus camera module is mounted on a micro-pan-tilt base 23. For example, lens 24 is an autofocus lens and is placed in a voice coil motor 20 that can move along the X and Y axes. The device includes the micro-pan-tilt base 23, a housing 29, and a circuit board 27. Other connection structures are well known in the art and will not be described in detail here.

[0050] Figure 11 and Figure 12The third embodiment of the present invention (moving coil rotary type) voice coil motor 30 and its application are shown. In this embodiment, the magnets used in the voice coil motor are all unipolar magnets.

[0051] Specifically, the voice coil motor 30 includes two first magnetic levitation components 31 and two second magnetic levitation components 32. The two first magnetic levitation components 31 are distributed on a pair of sides (Y-axis direction) of the micro-pan-tilt support (not shown), and the two second magnetic levitation components 32 are distributed on the other pair of sides (X-axis direction) of the micro-pan-tilt support. Figure 11 As shown, the first magnetic levitation component 31 includes a first magnet 311, a first coil 312 disposed on the emitting surface of the first magnet 311, and a first magnetic conductor 313 disposed on the side of the first coil 312. In this embodiment, the first magnetic levitation component 31 only includes one first magnet 311, and the second magnetic levitation component 32 only includes one second magnet 321, both of which are unipolar magnets. Figure 11 and Figure 12 The first coil 312 is disposed on the emitting surface of the first magnet 311. The emitting surface of the first magnet 311 is a curved surface. As shown in the figure, the emitting surface is arc-shaped. The first magnetic conductor 313 is located between the first magnet 311 and the first coil 312 and is opposite to the emitting surface of the first magnet 311 and the end of the first coil 312 (i.e. Figure 12 Similarly, the second magnetic levitation assembly 32 includes a second magnet 321, a second coil 322 disposed on the emitting surface of the second magnet 321, and a second magnetic conductor 323 disposed on the side of the second coil 322. The second magnetic conductor 323 is located between the second magnet 321 and the second coil 322 and faces the emitting surface of the second magnet 321 and the lower end of the second coil 322.

[0052] When the two first coils 312 on the Y-axis are energized, the magnets generate an interaction force, producing antiparallel driving forces F1 and F2, respectively. This propels the two first coils 321 to rotate counterclockwise around the X-axis. During this rotation, the two first coils 312 are pulled back by the magnetic attraction of the first magnetizer 313, reversing clockwise to a position where the couple is in equilibrium. When the two second coils 322 on the X-axis are energized, the magnets generate an interaction force, producing antiparallel driving forces F3 and F4, respectively. This propels the two second coils 322 to rotate clockwise around the Y-axis. During this rotation, the second coils 322 are pulled back by the magnetic attraction of the second magnetizer 323, reversing counterclockwise to a position where the couple is in equilibrium.

[0053] based on Figure 11-12 Optimization of the embodiment shown, Figure 13-1Figure 4 shows a dynamic rotary voice coil motor 40 with wide-angle switching. In this embodiment, two first magnetic levitation assemblies 41 are distributed along the Y-axis of the micro-pan-tilt base, and two second magnetic levitation assemblies 42 are distributed along the X-axis of the micro-pan-tilt base. Each first magnetic levitation assembly 41 includes a single first magnet 411, a first coil 412, and two first magnetic conductors 413 located at either end of the first coil 412. Each second magnetic levitation assembly 42 includes a single second magnet 421, a second coil 422, and two second magnetic conductors 423 located at either end of the second coil 422. The first coil 412 is arc-shaped and located between the emitting surface of the first magnet 411 and the first magnetic conductor 413. The second coil 422 is arc-shaped and located between the emitting surface of the second magnet 421 and the second magnetic conductor 423. When the two first coils 412 are energized, two driving forces F1 and F2 of equal magnitude and opposite directions are generated, driving the two first coils 412 to rotate clockwise or counterclockwise around the X-axis. During rotation, they are pulled back by the magnetic attraction of the first magnet 413 and reversed to a position of couple equilibrium. When the two second coils 422 are energized, two driving forces F3 and F4 of equal magnitude and opposite directions are generated, driving the two second coils 422 to rotate counterclockwise or clockwise around the Y-axis. During rotation, they are pulled back by the magnetic attraction of the second magnet 423 and reversed to a position of couple equilibrium. Note that the direction of the above-mentioned driving forces depends on the pulse current applied to the coils and can be set according to actual conditions. Only some embodiments are shown in the figure. The magnets in this embodiment also use unipolar magnets. Figures 14a-14b Two rotation angles of the first magnetic levitation component 41 are shown respectively. Preferably, the first magnetic conductor 413 and the second magnetic conductor 423 can be configured as a cylindrical shape.

[0054] Based on the configuration of this embodiment, the autofocus camera module installed on the micro gimbal support can obtain a stronger and wider range of driving force, and realize optical image stabilization function in the X and Y directions.

[0055] The voice coil motor of the present invention can be configured as a moving coil type or a moving magnet type according to actual conditions. The shape, thickness and location of the magnet in the magnetic levitation assembly can have various forms, such as Figure 15 In the shape shown, the magnet can be a unipolar magnet or a bipolar magnet without limitation.

[0056] Thus, based on the voice coil motor 20 of each of the aforementioned embodiments, when an autofocus camera module with a lens is mounted on a micro-pan-tilt mount, an autofocus camera module drive device, or "micro-pan-tilt," is formed. This autofocus camera module includes an actuator (not shown) that moves the lens along the optical axis (Z direction), achieving optical autofocus. Combined with the aforementioned voice coil motor, the autofocus camera module can be moved in both the X and Y directions, achieving dual-axis translation for image stabilization and anti-shake.

[0057] The micro-pan-tilt drive device of the present invention can also achieve optical autofocus and dual-axis translation for image stabilization when applied to electronic devices with cameras. Due to its thinness, high driving force, ease of assembly, and low cost, the micro-pan-tilt drive device is widely applicable to various small electronic devices and optical systems, such as thin camera phones, drones, and sports cameras, particularly mobile phones that require video stabilization for high-frequency vibrations. The other components of these electronic devices or optical systems are not described in detail here.

[0058] In addition, the suspension method of the voice coil motor of the present invention does not adopt traditional 4-wire, spring or contact ball designs. Instead, it adopts a suspended magnetic conductor such as a spherical steel ball, an arc-shaped thin sheet or a cylinder. It can be precisely suspended in a balanced position on the emitting surface of the magnet, thereby increasing the drop resistance of the voice coil motor.

[0059] It should be noted that variations in the size and number of magnets and coils based on the inventive concept of the present invention are within the scope of protection of the present invention. The above disclosure is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, equivalent variations made within the scope of the present invention's patent application are still within the scope of protection of the present invention.

Claims

1. A magnetic levitation assembly for a voice coil motor, wherein: The optical axis direction of the lens of the voice coil motor is defined as the Z-axis direction, and it is characterized by: comprising a magnet, a coil arranged on the emitting surface of the magnet, and a magnetizer arranged on the side of the coil, the magnetizer is located between the emitting surface of the magnet and the coil, and the magnetizer is aligned with the highest point of the emitting surface of the magnet, the emitting surface of the magnet is a curved surface or an inclined surface with different thicknesses; when the coil is energized, the coil or the magnet moves in a predetermined direction, and the magnetizer or the magnet maintains a magnetic levitation state.

2. The magnetic levitation assembly for a voice coil motor according to claim 1, wherein: The magnet is a bipolar magnet, there are two magnets, the north and south poles of the two magnets are arranged along the X-axis or Y-axis direction, the magnetic conductor is facing the emitting surface of one of the magnets and the end of the coil, and when the coil is energized, the coil or the magnet moves in the X-axis direction or the Y-axis direction.

3. The magnetic levitation assembly for a voice coil motor according to claim 1, wherein: The magnet is a bipolar magnet, there are two magnets, the north and south poles of the two magnets are arranged along the Z-axis direction, the magnetic conductor is facing the junction of the emitting surfaces of the two magnets and the middle of the coil, and when the coil is energized, the two magnets or the coil moves in the X-axis direction or the Y-axis direction.

4. The magnetic levitation assembly for a voice coil motor according to claim 1, wherein: The magnet is a unipolar magnet, the number of the magnet is one, and the magnetic conductor faces the middle of the emitting surface of the magnet and the end of the coil.

5. The magnetic levitation assembly for a voice coil motor according to claim 1, wherein: The magnet is a unipolar or bipolar magnet. The coil is arc-shaped and is located between the emitting surface of the magnet and the magnetic conductor. The two magnetic conductors are respectively located at the two ends of the coil. When the coil is energized, the coil moves in the X-axis direction or the Y-axis direction.

6. A voice coil motor, arranged on the side of a micro-pan-tilt support, wherein: The optical axis direction of the lens of the voice coil motor is defined as the Z-axis direction. The voice coil motor is characterized by comprising: a first magnetic levitation assembly and a second magnetic levitation assembly, wherein the first magnetic levitation assembly includes a first magnet, a first coil disposed on an emitting surface of the first magnet, and a first magnetic conductor disposed on a side of the first coil, the first magnetic conductor being located between the emitting surface of the first magnet and the first coil, and the first magnetic conductor being aligned with the highest point of the emitting surface of the first magnet; the second magnetic levitation assembly includes a second magnet, a second coil disposed on an emitting surface of the second magnet, and a second magnetic conductor disposed on a side of the second coil, the second magnetic conductor being located between the emitting surface of the second magnet and the second coil, and the second magnetic conductor being aligned with the highest point of the emitting surface of the second magnet, the emitting surfaces of the first magnet and the second magnet being curved surfaces or inclined surfaces having different thicknesses; when the first coil and the second coil are energized, the first coil and the second coil, or the first magnet and the second magnet, move in a predetermined direction, and the first magnetic conductor and the second magnetic conductor, or the first magnet and the second magnet, remain in a magnetic levitation state.

7. The voice coil motor according to claim 6, wherein: The two first magnetic levitation components are distributed on a diagonal line of the micro gimbal support and the north and south poles of the two first magnets in each first magnetic levitation component are arranged along the X-axis direction. The second magnetic levitation components are distributed on another diagonal line of the micro gimbal support and the north and south poles of the two second magnets in each second magnetic levitation component are arranged along the Y-axis direction. The first magnetic conductor is facing the emitting surface of one of the first magnets and the end of the first coil, and the second magnetic conductor is facing the emitting surface of one of the second magnets and the end of the second coil. When the first coil and the second coil are energized, the first coil moves in the X-axis direction and the second coil moves in the Y-axis direction. The first magnet and the second magnet are both bipolar magnets.

8. The voice coil motor according to claim 6, wherein: The two first magnetic levitation components are distributed in the Y-axis direction of the micro gimbal support and the north and south poles of the two first magnets in each first magnetic levitation component are arranged along the Z-axis direction. The two second magnetic levitation components are distributed in the X-axis direction of the micro gimbal support and the north and south poles of the two second magnets in each second magnetic levitation component are arranged along the Z-axis direction. The first magnetic conductor is facing the joint of the emitting surfaces of the two first magnets and the middle of the first coil. The second magnetic conductor is facing the joint of the emitting surfaces of the two second magnets and the middle of the second coil. When the first coil and the second coil are energized, the first magnet rotates around the X-axis direction and the second magnet rotates around the Y-axis direction. The first magnet and the second magnet are both bipolar magnets.

9. The voice coil motor according to claim 6, wherein: The two first magnetic levitation components are distributed in the X-axis direction of the micro gimbal support, and the two second magnetic levitation components are distributed in the Y-axis direction of the micro gimbal support. Each of the first magnetic levitation components includes a single first magnet, and each of the second magnetic levitation components includes a single second magnet. The coil is flat or arc-shaped, and the first magnetic conductor faces the emitting surface of the first magnet and the end of the first coil. The second magnetic conductor faces the emitting surface of the second magnet and the end of the second coil. When the first coil and the second coil are energized, the first coil rotates around the Y-axis direction and the second coil rotates around the X-axis direction. The first magnet and the second magnet can be unipolar or bipolar magnets.

10. A micro-pan-tilt drive device, comprising a micro-pan-tilt mount for carrying at least one auto-focus camera module and a voice coil motor for driving the micro-pan-tilt mount, characterized in that: The voice coil motor is as described in any one of claims 6 to 9.

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