A miniature vibration motor

Abstract

This utility model relates to the field of motor technology, specifically to a micro vibration motor. Its structure includes a housing, a mover assembly, and a coil assembly. A magnet is installed in a first groove of the vibrator, and no reinforcing ribs are provided in the first groove. This not only increases the magnet's volume, enhancing the electromagnetic force and improving the motor's start-up time and performance, but also results in low production cost, simple manufacturing process, and high efficiency. Simultaneously, the magnet's N and S poles are arranged horizontally and parallel to the coil, achieving optimal coupling of the coil's planar electromagnetic field, further enhancing the effective utilization of electromagnetic energy. This not only improves the overall driving force of the motor and reduces power consumption, but also effectively avoids the problems of insufficient vibration force or response delay that often occur under high load conditions.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a miniature vibration motor. Background Technology

[0002] In recent years, lateral micro vibration motors have been widely used in consumer electronics products such as smartphones, wearable devices, and game controllers to provide haptic feedback due to their compact structure and efficient vibration performance. With the trend towards thinner, lighter, and higher-performance electronic devices, improving motor vibration intensity, shortening response time, and optimizing energy efficiency within limited space has become a key direction for technological improvement in the industry.

[0003] Currently, commercially available transverse micro vibration motors typically employ a structural design combining a vibrator and an electromagnetic drive assembly. The vibrator usually includes components such as magnets and counterweights, while the electromagnetic drive assembly consists of coils and magnetically conductive parts. However, existing technologies still suffer from the following significant drawbacks:

[0004] (1) Low structural space utilization and limited magnet volume. Existing vibrator designs typically incorporate transverse or longitudinal reinforcing ribs in their central region to enhance the vibrator's mechanical strength and resistance to deformation. However, these reinforcing ribs occupy the already limited space inside the motor, compressing the installation space for the magnet and forcing its volume to shrink. As the core component of the electromagnetic drive system, the magnet's volume directly determines the magnetic field strength and electromagnetic force output efficiency. Due to the small size of the magnet, the magnetic field strength it generates is insufficient, resulting in a weak electromagnetic force between the drive coil and the magnet. This leads to a prolonged motor start-up time, reduced instantaneous response performance, and difficulty in meeting the demands for high-frequency, high-intensity tactile feedback.

[0005] (2) Inappropriate magnetic pole arrangement and low magnetic circuit efficiency. In the prior art, the N and S poles of the magnet are usually arranged vertically (i.e., perpendicular to the coil plane) and placed directly above the coil assembly. This magnetic pole arrangement results in a long magnetic field line distribution path, and magnetic leakage is easily generated during the transmission of the magnetic field, resulting in low magnetic circuit closure efficiency. In addition, the vertical magnetic pole arrangement makes it difficult to form optimal coupling with the planar electromagnetic field of the coil, further weakening the effective utilization rate of electromagnetic energy. As a result, the overall driving force of the motor decreases, power consumption increases, and insufficient vibration force or response delay is prone to occur under high load scenarios.

[0006] In summary, existing transverse micro vibration motors still have significant technical shortcomings in terms of magnet layout, magnetic pole optimization, and space utilization. Utility Model Content

[0007] In view of the above problems, this utility model provides a miniature vibration motor that solves the significant technical shortcomings of existing transverse miniature vibration motors in terms of magnet layout, magnetic pole optimization and space utilization.

[0008] Firstly, this utility model provides a miniature vibration motor, including...

[0009] The housing includes an upper housing and a lower housing, wherein the upper housing is fixed above the lower housing;

[0010] A moving part assembly is movably disposed within the upper housing. The moving part assembly includes a vibrator, a magnet, and a spring arm. The vibrator has a first groove with a flat bottom surface in its middle part, and the magnet is disposed in the first groove. The spring arm has a first end, a second end, and a connecting part that connects the first end and the second end. The first end is connected to the vibrator, and the second end is connected to the inner wall of the upper housing.

[0011] A coil assembly includes a coil and a circuit board, the circuit board being disposed on the upper end of the lower housing, the coil being located on the upper end of the circuit board and electrically connected to the circuit board; the coil is located below the mover assembly;

[0012] The N and S poles of the magnet are arranged horizontally and parallel to the coil.

[0013] In some alternative embodiments, a first slot is provided on one surface of the vibrator, and the first slot is disposed adjacent to the coil assembly; the first groove is disposed in the first slot.

[0014] In some alternative embodiments, the magnet is a single-circuit magnet, a dual-circuit magnet, or a hybrid-circuit magnet.

[0015] In some alternative embodiments, the magnet is a hybrid magnetic circuit magnet; the magnet has a first magnetic region and a second magnetic region connected together, the first magnetic region being a bipolar magnet and the second magnetic region being a monopolar magnet.

[0016] In some alternative embodiments, positioning portions are provided on both sides of the vibrator; the first end abuts and is positioned on the positioning portion and is fixedly disposed on the first side wall of the vibrator by welding; the second end is fixedly disposed on the first inner wall of the upper housing by welding, and the first inner wall is disposed away from the first side wall.

[0017] In some alternative configurations, the spring arms are in a "C" shape and there are two spring arms.

[0018] In some alternative embodiments, the first end and the second end are formed by bending and riveting the ends of the connecting portion; the first surface and / or the second surface of the connecting portion are provided with cushioning elements.

[0019] In some alternative embodiments, the side of the vibrator adjacent to the connecting part is a second side, the second side is provided with a buffer clearance, the bottom surface of the buffer clearance is an inclined surface, and the angle between the inclined surface and the second side is 5°-10°.

[0020] In some alternative configurations, the circuit board is an FPCB board; the lower housing is provided with a cable outlet; the circuit board includes a main board and a connecting board, the main board is fixed to the upper surface of the lower housing, one end of the connecting board is connected to the main board and the other end of the connecting board is bent along the cable outlet so that the free end of the connecting board is located on the lower surface of the lower housing.

[0021] In some alternative configurations, the sidewall of the lower housing is further provided with a welding protrusion, and the upper housing is provided with a welding groove for welding and fixing to the welding protrusion; the upper surface of the lower housing is further provided with at least one anti-collision protrusion to prevent the moving part assembly from hitting the coil.

[0022] This invention provides a miniature vibration motor, which, compared to existing technologies, has the following advantages:

[0023] The miniature vibration motor of this invention includes a housing, a mover assembly, and a coil assembly. The magnet of this invention is installed in the first groove of the vibrator, and no reinforcing ribs are provided in the first groove. This not only increases the volume of the magnet, enhances the electromagnetic force, and improves the motor start-up time and performance, but also results in low production cost, simple process, and high efficiency of the vibrator. In addition, the elimination of the reinforcing rib design of this invention can make great use of the internal space of the vibrator, thereby saving the overall motor space. The thickness of the miniature vibration motor of this invention can be as low as 2.0 mm.

[0024] Meanwhile, the N and S poles of the magnet are arranged horizontally and parallel to the coil, achieving optimal coupling of the coil's planar electromagnetic field and further enhancing the effective utilization of electromagnetic energy. This not only improves the overall driving force of the motor and reduces power consumption, but also effectively avoids problems such as insufficient vibration or response delay that may occur under high load conditions.

[0025] The above description is merely an overview of the technical solutions of the present utility model embodiments. In order to better understand the technical means of the present utility model embodiments and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present utility model embodiments more obvious and understandable, specific embodiments of the present utility model are described below. Attached Figure Description

[0026] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 A schematic diagram of the structure of the miniature vibration motor provided by this utility model is shown;

[0028] Figure 2 An exploded schematic diagram of the miniature vibration motor provided by this utility model is shown;

[0029] Figure 3 A schematic diagram of the structure of the mover assembly provided by this utility model is shown;

[0030] Figure 4 This invention provides a schematic diagram of the coil assembly and lower housing.

[0031] Figure 5 A cross-sectional schematic diagram of the miniature vibration motor provided by this utility model is shown.

[0032] in,

[0033] 1. Housing;

[0034] 11. Upper casing;

[0035] 12. Lower housing; 121. Anti-collision boss; 122. Welding protrusion;

[0036] 2. Moving component;

[0037] 21. Vibrator; 211. First slot; 212. First groove; 213. Positioning part; 214. Buffer clearance part;

[0038] 22. Magnets;

[0039] 23. Spring arm; 231. First end; 232. Second end; 233. Connecting part;

[0040] 24. Buffer components;

[0041] 3. Coil assembly;

[0042] 31. Coil;

[0043] 32. Circuit board; 321. Main board; 322. Connector board. Detailed Implementation

[0044] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein.

[0045] Example 1:

[0046] Figure 1-5 The present invention illustrates a first embodiment of a miniature vibration motor, which can be applied to consumer electronics products such as mobile phones, watches, and game controllers. By miniaturizing the vibration motor, space utilization of consumer electronics products is saved and a good user experience is provided. The miniature vibration motor specifically includes a housing 1, a mover assembly 2, and a coil assembly 3.

[0047] Specifically, the housing includes an upper housing 11 and a lower housing 12, with the upper housing 11 fixed above the lower housing 12. The mover assembly 2 is movably disposed within the upper housing 11. The mover assembly 2 includes a vibrator 21, a magnet 22, and a spring arm 23. The vibrator 21 has a first groove 212 with a flat bottom surface in its middle, and the magnet 22 is disposed within the first groove 212. The spring arm 23 has a first end 231, a second end 232, and a connecting part 233 connecting the first end 231 and the second end 232. The first end 231 is connected to the vibrator 21, and the second end 232 is connected to the inner wall of the upper housing 11. The coil assembly 3 includes a coil 31 and a circuit board 32. The circuit board 32 is disposed at the upper end of the lower housing 12, and the coil is located at the upper end of the circuit board 32, with the coil 31 electrically connected to the circuit board 32. The coil is located below the mover assembly 2. The N pole and S pole of the magnet 22 are arranged horizontally and parallel to the coil.

[0048] Compared to existing technologies, this invention eliminates the reinforcing rib at the mounting position of the magnet 22 on the vibrator 21, resulting in lower production costs and a simpler manufacturing process for the vibrator 21. Increasing the volume of the magnet 22 enhances the electromagnetic force, improving motor start-up time and performance. Furthermore, the vibrator 21 boasts low production costs, simple manufacturing processes, and high efficiency. This invention also eliminates the step on the upper magnetic conductive plate of the vibrator 21, presenting a planar structure, further reducing production costs and simplifying the manufacturing process. By eliminating the magnetic conductive plate and replacing the upper step of the vibrator 21 with a flat surface, this invention reduces costs and simplifies the manufacturing process.

[0049] In this embodiment, the miniature vibration motor of this invention includes a housing, a mover assembly 2, and a coil assembly 3. The magnet 22 is installed within the first groove 212 of the vibrator 21, and no reinforcing ribs are provided in the first groove 212. This not only increases the volume of the magnet 22, enhancing the electromagnetic force and improving the motor's start-up time and performance, but also results in low production cost, simple manufacturing process, and high efficiency for the vibrator 21. Simultaneously, the N and S poles of the magnet 22 are arranged horizontally and parallel to the coil, achieving optimal coupling of the coil's planar electromagnetic field and further enhancing the effective utilization of electromagnetic energy. This not only improves the overall driving force of the motor and reduces power consumption, but also effectively avoids the problems of insufficient vibration force or response delay that often occur under high load conditions.

[0050] Example 2:

[0051] Based on Embodiment 1, this utility model illustrates a second embodiment of a miniature vibration motor, further describing the housing, mover assembly 2, and coil assembly 3 in Embodiment 1.

[0052] In the moving component 2, see Figure 3 , Figure 5 The vibrator 21 has a first slot 211 on one surface, and the first slot 211 is adjacent to the coil assembly 3; a first groove 212 is disposed in the first slot 211. In this embodiment, the coil can be installed exactly below the first slot 211, and when the vibrator assembly 2 vibrates, the coil can always be located below the first slot 211, thereby reducing the distance between the coil and the magnet 22, thereby further improving the electromagnetic force and improving the motor start-up time and performance.

[0053] In the mover assembly 2, the magnet 22 is a single-circuit magnet 22, a dual-circuit magnet 22, or a hybrid-circuit magnet 22. In this embodiment, compared with the prior art, the volume of the magnet 22 is increased to improve the driving force of the motor. Specifically, the magnet 22 can be a single-circuit magnet 22, which simplifies the design of the magnet 22, reduces costs, and is suitable for scenarios with low performance requirements; in addition, the magnet 22 can also be a dual-circuit magnet 22, which can achieve high thrust, low vibration, and high precision, thereby improving the performance of the magnet 22; the magnet 22 has two N / S poles on each side, which increases the driving force. In the above-mentioned magnet 22, the magnet 22 adopts a post-magnetization method. The magnet 22 and the vibrator 21 are assembled before magnetization. The neutral position of the magnetic pole is at 1 / 2 of the length of the magnet 22. The assembly process of the magnet 22 is simple and it will not attract each other.

[0054] In another embodiment of the above embodiment, the magnet 22 in this embodiment is a hybrid magnetic circuit magnet 22; the magnet 22 has a first magnetic region and a second magnetic region connected to each other. The first magnetic region is a double-pole magnet 22, and the second magnetic region is a single-pole magnet 22. Such a design can combine the performance characteristics of a single magnetic circuit magnet 22 and a double magnetic circuit magnet 22; it can not only simplify the design and reduce costs, but also enable the magnet 22 to achieve the performance characteristics of high thrust, low vibration, and high precision. In this embodiment, the magnet 22 adopts the post-magnetization method. After the magnet 22 and the vibrator 21 are assembled, magnetization is carried out. The neutral position of the magnetic pole is at the 1 / 2 of the length of the magnet 22. The assembly process of the magnet 22 is simple and they will not attract each other. The first magnetic region of the magnetic pole of the magnet 22 has 2 N / S poles, which improves the driving force; the second magnetic region is 1 N / S pole, which simplifies the structure.

[0055] In the mover assembly 2, positioning parts 213 are respectively arranged on both sides of the vibrator 21; the first end 231 abuts and is positioned on the positioning part 213 and the first end 231 is fixedly arranged on the first side wall of the vibrator 21 by welding; the second end 232 is fixedly arranged on the first inner wall of the upper housing 11 by welding, and the first inner wall is arranged away from the first side wall. The spring arm 23 is in a "C" shape, and the number of spring arms 23 is 2. The first end 231 and the second end 232 are formed by bending and riveting the ends of the connecting part 233 together. In this embodiment, the two spring arms 23 are respectively arranged on both sides of the vibrator 21 and are both connected from the side of the vibrator 21 to the inside of the upper housing 11 on the other side of the vibrator 21, thus forming a structure similar to a "hui"; when the mover assembly 2 vibrates, the vibrator 21 moves horizontally under the elastic pulling of the spring arms 23 to achieve the vibration effect. The "C" shape of the spring arm 23 can make the spring arm 23 have an elastic effect. The first end 231 and the second end 232 are formed by bending and riveting the ends of the connecting part 233 together. Specifically, when producing the spring, the spring raw material is folded to the side where the spring is welded for riveting, here to replace the welded reinforcing plate, reducing the process of welding the reinforcing plate and the spring together. The integral folding and riveting forming is more firm and reduces costs.

[0056] In some alternative embodiments, a buffer 24 is provided on the first and / or second surfaces of the connecting portion 233; the side of the vibrator 21 adjacent to the connecting portion 233 is a second side surface, and a buffer clearance position 214 is provided on the second side surface. The bottom surface of the buffer clearance position 214 is an inclined surface, and the angle between the inclined surface and the second side surface is 5°-10°. In this embodiment, the buffer 24 can be a foam damper; the buffer 24 can be provided on the first surface of the connecting portion 233 to prevent the connecting portion 233 of the spring arm 23 from colliding with the body of the vibrator 21; the buffer clearance position 214 provided on the second side surface of the vibrator 21 can prevent the vibrator 21 from colliding with the buffer 24 or the spring arm 23 during vibration; the buffer 24 can also be provided on the second surface of the connecting portion 233 to prevent the connecting portion 233 of the spring arm 23 from colliding with the upper housing 11. In addition, the buffer 24 can be provided on the buffer clearance position 214 of the vibrator 21 to reduce the impact between the spring arm 23 and the vibrator 21. The damping foam is first installed on the vibrator 21, and then the spring is assembled and welded. This ensures the accuracy of the installation position of the damping foam and improves efficiency.

[0057] Example 3:

[0058] Based on Embodiment 1 or Embodiment 2, this utility model illustrates a third embodiment of a miniature vibration motor, further describing the housing, mover assembly 2 and coil assembly 3 in Embodiment 1 or 2.

[0059] In some alternative methods, see Figure 4 The circuit board 32 is an FPCB board; the lower housing 12 is provided with a cable outlet; the circuit board 32 includes a main board 321 and a connecting board 322. The main board 321 is fixed to the upper surface of the lower housing 12. One end of the connecting board 322 is connected to the main board 321, and the other end of the connecting board 322 is bent along the cable outlet so that the free end of the connecting board 322 is located on the lower surface of the lower housing 12. In this embodiment, the product volume is reduced by designing the circuit board 32. Specifically, the present invention eliminates the tray of the FPCB in the lower housing 12. The length of the lower housing 12 is the same as that of the upper housing 11, making the product rectangular. The FPCB extends out from the housing and folds onto one side of the lower housing 12. The FPCB is covered with double-sided adhesive and is bonded to the lower housing 12. The FPCB has conductive pads, through which power is supplied to the motor. In this way, the user can directly connect the pins to the pads to supply power to the motor without soldering wires or other connection methods to the motor. It is small in size, convenient to power on, and low in cost. The back of the FPCB uses thermosetting adhesive. After the FPCB is installed, it needs to be heated to melt the adhesive and firmly bond it to the lower housing 12. In environmental tests, the FPCB is not easy to lift up, resulting in better reliability.

[0060] In some alternative methods, see Figure 5The lower housing 12 has a welding protrusion 122 on its side wall, and the upper housing 11 has a welding groove for welding and fixing to the welding protrusion 122. The upper surface of the lower housing 12 also has at least one anti-collision protrusion 121 to prevent the vibrator assembly 2 from hitting the coil. In this embodiment, the lower housing 12 is provided with an anti-collision protrusion 121. During mechanical testing, the vibrator 21 will have an impact force, which may easily hit the coil and cause a short circuit. With the presence of the anti-collision protrusion 121, the vibrator 21 will contact the anti-collision protrusion 121 first and will not hit the coil.

[0061] Furthermore, the elimination of reinforcing ribs in this invention significantly utilizes the internal space of the vibrator, thereby saving overall motor space. The thickness of the miniature vibration motor of this invention can be as low as 2.0mm. The thickness of the miniature vibration motor can be calculated from the upper surface of the upper housing to the lower surface of the lower housing, or from the upper surface of the upper housing to the connecting plate. Achieving a minimum thickness of 2.0mm for the miniature vibration motor is the thinnest in the industry.

[0062] Example 4:

[0063] This application also provides a micro vibration motor installation procedure. Specifically, this product is produced in three stages: coil assembly 3 and lower housing 12 assembly, mover assembly 2 assembly, and final assembly.

[0064] The assembly sequence of coil assembly 3 and lower housing 12 is as follows: First, the lower housing 12 assembly is manually or correctly placed onto the transfer fixture and flows to the next process. Then, the FPCB installation process begins, where the equipment automatically picks up the material for installation and then proceeds to the next process. The FPCB is hot-pressed to melt the thermosetting adhesive on the back of the FPCB and bond it to the lower housing 12. Next, adhesive is applied to the FPCB. Then, the coil is installed manually onto a special fixture. The starting and ending wires are guided into the lead slots of the coil installation mold as required and then cut. The coil and the special fixture flow together to the next process. The automatic coil installation machine positions the coil installation fixture, and the machine's grippers accurately clamp the coil and move it onto the lower housing 12 assembly containing the FPCB for installation. Simultaneously, the machine's cold light source UV lamp begins curing to prevent coil displacement during the movement of the transfer fixture. Next, UV curing is performed to harden the adhesive between the coil and the FPCB, ensuring a firm bond. Then, the coil is wired, with the starting and ending wires placed between the pads on the FPCB. Excess wire ends are trimmed, and then electronic soldering is used to weld the coil and FPCB together, forming a complete circuit. This is followed by UV curing, visual inspection, impedance testing, and packaging.

[0065] Assembly of vibrator assembly 2: First, install vibrator 21 on a special fixture, then apply adhesive, then install magnet 22 in the middle of vibrator 21, then perform UV curing to fully cure the adhesive, then put vibrator assembly 21 into a magnetizing mold for axial magnetization and visual inspection.

[0066] Final Assembly: Place the vibrator 21 assembly 2 containing the magnet 22 into a dedicated fixture. Attach damping foam to both sides of the vibrator 21. Then, install the springs into the dedicated fixture, aligning one end of each spring with the welding position on the vibrator 21. Perform laser welding to firmly weld one end of the spring to the vibrator 21. Inspect the welding results. Next, place the upper housing 11 assembly into a dedicated welding fixture. Place the welded springs and vibrator 21 assembly 2 into the upper housing 11 assembly for laser welding and visual inspection. Finally, place the assembled upper housing 11 assembly onto the dedicated fixture. Align the lower housing 12 assembly with the notch and gently assemble them. Perform laser welding on the upper and lower housings 12 to complete the single-unit motor.

[0067] This invention relates to a miniature vibration motor comprising a housing, a mover assembly 2, and a coil assembly 3. The magnet 22 is installed within the first groove 212 of the vibrator 21, and no reinforcing ribs are provided within the first groove 212. This not only increases the volume of the magnet 22, enhancing the electromagnetic force and improving the motor's start-up time and performance, but also results in low production cost, simple manufacturing process, and high efficiency for the vibrator 21. Furthermore, the N and S poles of the magnet 22 are arranged horizontally and parallel to the coil, achieving optimal coupling of the coil's planar electromagnetic field and further enhancing the effective utilization of electromagnetic energy. This not only improves the overall driving force of the motor and reduces power consumption, but also effectively avoids the problems of insufficient vibration force or response delay that often occur under high load conditions.

[0068] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Furthermore, the embodiments of this invention are not directed to any particular programming language.

[0069] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. Similarly, for the sake of brevity and to aid in understanding one or more aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. The claims, which follow the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself constitutes a separate embodiment of the invention.

[0070] Those skilled in the art will understand that the modules in the device of the embodiment can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiment can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components, except that at least some of such features and / or processes or units are mutually exclusive.

[0071] It should be noted that the above embodiments are illustrative of the present invention and not restrictive of it, and those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims listing several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A miniature vibration motor, characterized in that, include The housing (1) includes an upper housing (11) and a lower housing (12), wherein the upper housing (11) is fixed above the lower housing (12); The moving part assembly (2) is movably disposed within the upper housing (11). The moving part assembly (2) includes a vibrator (21), a magnet (22), and a spring arm (23). The vibrator (21) has a first groove (212) with a flat bottom surface in the middle, and the magnet (22) is disposed within the first groove (212). The spring arm (23) has a first end (231), a second end (232), and a connecting part (233) connecting the first end (231) and the second end (232). The first end (231) is connected to the vibrator (21), and the second end (232) is connected to the inner wall of the upper housing (11). The coil assembly (3) includes a coil (31) and a circuit board (32). The circuit board (32) is disposed on the upper end of the lower housing (12). The coil is located on the upper end of the circuit board (32) and is electrically connected to the circuit board (32). The coil is located below the actuator assembly (2). The N and S poles of the magnet (22) are arranged horizontally and parallel to the coil.

2. The miniature vibration motor according to claim 1, characterized in that, The vibrator (21) has a first slot (211) on one surface, and the first slot (211) is disposed adjacent to the coil assembly (3); the first groove (212) is disposed in the first slot (211).

3. The miniature vibration motor according to claim 2, characterized in that, The magnet (22) is a single magnetic circuit magnet (22), a double magnetic circuit magnet (22), or a mixed magnetic circuit magnet (22).

4. The miniature vibration motor according to claim 3, characterized in that, The magnet (22) is a hybrid magnetic circuit magnet (22); the magnet (22) has a first magnetic region and a second magnetic region connected together, the first magnetic region is a double magnetic pole magnet (22), and the second magnetic region is a single magnetic pole magnet (22).

5. The miniature vibration motor according to claim 2, characterized in that, The vibrator (21) is provided with positioning parts (213) on both sides; the first end (231) is abutted and positioned on the positioning part (213) and the first end (231) is fixedly disposed on the first side wall of the vibrator (21) by welding; the second end (232) is fixedly disposed on the first inner wall of the upper housing (11) by welding, and the first inner wall is disposed away from the first side wall.

6. The miniature vibration motor according to claim 5, characterized in that, The spring arm (23) has a "C" shaped structure, and there are two spring arms (23).

7. The miniature vibration motor according to claim 6, characterized in that, The first end (231) and the second end (232) are formed by bending and riveting the ends of the connecting part (233); the first surface and / or the second surface of the connecting part (233) are provided with a buffer (24).

8. The miniature vibration motor according to claim 7, characterized in that, The side adjacent to the vibrator (21) and the connecting part (233) is the second side. The second side is provided with a buffer clearance position (214). The bottom surface of the buffer clearance position (214) is an inclined surface, and the angle between the inclined surface and the second side is 5°-10°.

9. The miniature vibration motor according to claim 1, characterized in that, The circuit board (32) is an FPCB board; the lower housing (12) is provided with a cable outlet; the circuit board (32) includes a main board (321) and a connecting board (322). The main board (321) is fixed on the upper surface of the lower housing (12). One end of the connecting board (322) is connected to the main board (321) and the other end of the connecting board (322) is bent along the cable outlet so that the free end of the connecting board (322) is located on the lower surface of the lower housing (12).

10. The miniature vibration motor according to claim 1, characterized in that, The side wall of the lower housing (12) is also provided with a welding protrusion (122), and the upper housing (11) is provided with a welding groove that is welded and fixed to the welding protrusion (122); the upper surface of the lower housing (12) is also provided with at least one anti-collision protrusion (121) to prevent the moving part assembly (2) from hitting the coil.

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