Horizontal linear vibration motor

Abstract

The utility model relates to the technical field of vibration motors, and discloses a horizontal linear vibration motor, which comprises a shell, a cover body, a vibrator assembly, a stator assembly and elastic pieces, the shell and the cover body are buckled to form an accommodating space, the vibrator assembly is connected to the shell through the elastic pieces fixed on the two sides of the vibrator assembly, and the vibrator assembly is suspended in the accommodating space. The stator assembly is fixed on the cover body, the vibrator assembly and the stator assembly are vertically arranged at an interval, the antenna is characterized in that the stator assembly comprises a flexible circuit board and a coil assembly, the coil assembly comprises a driving coil with a first lead and an induction coil with a second lead, the first lead is electrically connected with the flexible circuit board, and the second lead is electrically connected with the induction coil. And the second lead is in signal connection with the flexible circuit board. The vibration motor is simple and compact in structure, and the induction coil is used for detecting and feeding back the position of the magnetic steel, so that the vibration feedback performance of the vibration motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration motors, in particular to a horizontal linear vibration motor. Background Art

[0002] With the advancement of electronic technology, portable consumer electronics, such as mobile phones, handheld game consoles, and multimedia entertainment devices, have gradually taken over the global consumer market. These electronic products generally use linear vibration motors for tactile feedback, such as incoming call notifications on mobile phones and vibration feedback on game consoles. To meet such a wide range of applications, the requirements for linear vibration motors to be miniaturized and have higher vibration performance are becoming increasingly stringent.

[0003] Existing linear vibration motors usually include horizontal linear vibration motors (not shown), which include a shell with an open end, a cover, a vibrator assembly, a stator assembly and an elastic member. One end of the elastic member is connected to both sides of the vibrator assembly, and the other end is connected to the inner wall of the shell, so that the vibrator assembly is suspended in the shell, and the stator assembly is fixed to the inner surface of the cover. The shell and the cover are buckled to form an accommodating space. The vibrator assembly and the stator assembly are placed in the accommodating space with upper and lower intervals. The stator assembly includes a flexible circuit board and a coil. Specifically, the flexible circuit board is bonded and fixed to the inner surface of the cover, and the coil is bonded and fixed on the flexible circuit board to form an electrical connection; the vibrator assembly includes a square mass block and a magnet embedded in the mass block. The coil and the magnet are arranged correspondingly and at intervals. Using the principle of electromagnetic induction, the coil is energized through the flexible circuit board of the stator assembly to generate a magnetic field, which drives the vibrator assembly equipped with the magnet to perform reciprocating motion, alternately changing the direction of the current in the coil to generate an alternating driving force. When the frequency of the alternating current is equivalent to the natural frequency of the motor itself, resonance will be generated, amplifying the vibration effect. Due to the closed structure of the vibration motor, the position of the magnet relative to the coil is usually misaligned due to assembly tolerances and other reasons, and external equipment cannot directly and accurately detect the position of the magnet, resulting in different vibration feedback effects under the same signal drive, greatly reducing the user's vibration experience. Therefore, existing vibration motors usually set up Hall elements near the magnet to detect and feedback the magnet position, thereby adjusting the driving current signal to ensure the vibration effect. Although the Hall element can realize the magnet position detection function and feedback, the Hall element needs to occupy a large part of the vibration motor accommodation space, which cannot meet the demand for increasingly miniaturized vibration motors.

[0004] Therefore, there is an urgent need for a horizontal linear vibration motor with good vibration feedback performance to solve the technical problems of existing vibration motors. Utility Model Content

[0005] The purpose of this utility model is to provide a horizontal linear vibration motor with a simple and compact structure and good vibration feedback performance. The specific technical solution is as follows:

[0006] A horizontal linear vibration motor includes a shell, a cover, a vibrator assembly, a stator assembly and an elastic member. The shell and the cover are buckled together to form an accommodating space. The vibrator assembly is connected to the shell by fixing the elastic members on both sides thereof and is suspended in the accommodating space. The stator assembly is fixed on the cover. The vibrator assembly and the stator assembly are spaced apart from each other in the upper and lower directions. The stator assembly includes a flexible circuit board and a coil assembly. The coil assembly includes a driving coil having a first lead and an induction coil having a second lead. The first lead is electrically connected to the flexible circuit board, and the second lead is signal-connected to the flexible circuit board.

[0007] Preferably, the number of turns of the induction coil is smaller than the number of turns of the drive coil.

[0008] Preferably, the induction coil is arranged outside the driving coil.

[0009] Preferably, the driving coil is arranged outside the induction coil.

[0010] Preferably, the vertical height of the induction coil is less than or equal to the vertical height of the driving coil.

[0011] Preferably, the induction coil is fixed to the upper surface of the driving coil.

[0012] Preferably, the induction coil is fixed to the lower surface of the driving coil.

[0013] Preferably, the horizontal area of ​​the induction coil is smaller than or equal to the horizontal area of ​​the drive coil.

[0014] Preferably, the vibrator assembly includes a mass block, a magnet and a pole piece embedded in the mass block, and a damping member fixed on both sides of the mass block and located between the mass block and the elastic member.

[0015] Preferably, the flexible circuit board includes an internal connection end and an external connection end, the internal connection end is located in the accommodating space and is respectively connected to the first lead and the second lead, and the external connection end is extended outside the accommodating space.

[0016] Compared with the existing technology, the present invention provides a horizontal linear vibration motor with a simple and compact structure. The vibration motor is a new type of coil assembly that combines an induction coil and a drive coil. The induction coil simultaneously assists the drive coil and detects and provides feedback on the position of the magnetic steel, allowing the vibration motor to adjust the current signal in a timely manner, thereby improving the vibration feedback performance of the vibration motor. At the same time, it also meets the miniaturization requirements of electronic equipment for vibration motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is an exploded view of the horizontal linear vibration motor structure of the first embodiment.

[0018] Figure 2 FIG. 1 is a cross-sectional view of a horizontal linear vibration motor according to a first embodiment.

[0019] Figure 3 This is a perspective view of the coil assembly according to the first embodiment.

[0020] Figure 4 This is a structural diagram of the stator assembly and the cover body of the first embodiment.

[0021] Figure 5 It is a perspective view of a coil assembly according to a second embodiment.

[0022] Figure 6 It is a perspective schematic diagram of a coil assembly according to a third embodiment.

[0023] Figure 7 It is a perspective view of a coil assembly according to a fourth embodiment.

[0024] in:

[0025] 1- shell;

[0026] 2-cover; 20-support plate;

[0027] 3-vibrator assembly; 30-mass block; 31-permanent magnet; 32-magnetic plate; 33-damping element;

[0028] 4-stator assembly; 40-flexible circuit board; 401-internal connection terminal; 402-external connection terminal;

[0029] 41 - coil assembly; 410 - driving coil; 4100 - first lead; 411 - induction coil; 4110 - second lead; 5 - elastic member. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] The structure of a horizontal linear vibration motor in the first embodiment of the utility model is as follows Figures 1 to 4As shown, it includes a shell 1, a cover 2, a vibrator assembly 3, a stator assembly 4 and an elastic member 5. The shell and the cover are buckled to form an accommodating space (not marked). The vibrator assembly 3 is connected to the inner wall of the shell 1 (not marked) by fixing the elastic members 5 on both sides thereof and suspending it in the accommodating space. The stator assembly 4 is fixed on the cover 2. The vibrator assembly 3 and the stator assembly 4 are spaced apart from each other. The vibrator assembly 3 includes a mass block 30, a magnet 31 and a pole piece 32 embedded in the mass block 30, and a damping member 33 fixed on both sides of the mass block 30 and located between the mass block 30 and the elastic member 5. The stator assembly 4 includes a flexible circuit board 40 and a coil assembly 41. The coil assembly 41 includes a There is a driving coil 410 with a first lead 4100 and an induction coil 411 with a second lead 4110, the first lead 4100 is electrically connected to the flexible circuit board 40, and the second lead 4110 is signal-connected to the flexible circuit board 40; the flexible circuit board 40 includes an internal connection terminal 401 and an external connection terminal 402; the cover body 2 includes a main body (not marked) and a support plate 20 extending from the main body to provide a storage space, the internal connection terminal 401 is located in the storage space and is fixed on the inner surface of the cover plate 2, the external connection terminal 402 is extended outside the storage space and is fixed on the support plate 20, the first lead 4100 and the second lead 4110 are respectively connected to the internal connection terminal 401. In this embodiment, the induction coil 411 is arranged outside the driving coil 410. The wire diameter of the induction coil 411 is consistent with that of the driving coil 410. The number of turns of the induction coil 411 is less than the number of turns of the driving coil 410. The vertical height and horizontal thickness of the induction coil 411 are both less than or equal to the vertical height and horizontal thickness of the driving coil 410, making the structure of the vibration motor compact and ensuring the utilization of the internal space of the vibration motor.

[0032] The structure of the coil assembly 41 of a horizontal linear vibration motor in the second embodiment of the present invention is as follows: Figure 5 As shown, as an alternative to the coil assembly 41 of the present invention, the driving coil 410 is arranged outside the induction coil 411, the number of turns of the induction coil 411 is less than the number of turns of the driving coil 410, and the vertical height and horizontal thickness of the induction coil 411 are both less than or equal to the vertical height and horizontal thickness of the driving coil 410, ensuring that the induction coil 411 only occupies a very small part of the entire coil assembly 41, making the structure of the vibration motor compact and improving the utilization rate of the internal accommodating space of the vibration motor.

[0033] The structure of the coil assembly 41 of a horizontal linear vibration motor in the third embodiment of the present invention is as follows: Figure 6As shown, as an alternative to the coil assembly 41 of the present invention, the induction coil 411 is fixed to the upper surface of the driving coil 410. The number of turns of the induction coil 411 is smaller than the number of turns of the driving coil 410, and the horizontal area and vertical thickness of the induction coil 411 are both smaller than or equal to the horizontal area and vertical thickness of the driving coil 410, ensuring that the induction coil 411 only occupies a very small part of the entire coil assembly 41, making the structure of the vibration motor compact and improving the utilization rate of the internal accommodating space of the vibration motor.

[0034] The structure of the coil assembly 41 of a horizontal linear vibration motor in the fourth embodiment of the present invention is as follows: Figure 7 As shown, as an alternative to the coil assembly 41 of the present invention, the induction coil 411 is fixed to the lower surface of the driving coil 410. The number of turns of the induction coil 411 is smaller than the number of turns of the driving coil 410, and the horizontal area and thickness of the induction coil 411 are both smaller than or equal to the horizontal area and vertical thickness of the driving coil 410, ensuring that the induction coil 411 only occupies a very small part of the entire coil assembly 41, making the structure of the vibration motor compact and improving the utilization rate of the internal accommodating space of the vibration motor.

[0035] The driving coil 410 in the internal accommodation space of the horizontal linear vibration motor of the present invention is connected to an external power supply through the external connection terminal 402 and is electrically connected through the internal connection terminal 401. When current is input through the first lead 4100, the driving coil 410 generates an electromagnetic field. The magnet 31 moves horizontally under the driving action of the electromagnetic field, driving the mass block 30 on which the magnet 31 is installed to move horizontally. Then, through the rebound force of the elastic members 5 on both sides of the vibrator assembly 3, the reciprocating motion of the vibrator assembly 3 equipped with the mass block 30 is realized to generate vibration feedback. During the reciprocating vibration of the vibrator assembly 3, the magnetic field of the magnet 31 during vibration cuts the induction coil 411. However, the induction coil 411 in the present invention is only connected to the signal of the internal connection terminal 401 of the flexible circuit board 40 through its second lead 4110, and is in an open state, so that the vibration motor only generates an induced voltage without an induced current. The induced voltage is then transmitted to an external detection device (not shown) through the external connection terminal 402 of the flexible circuit board 40 to form a feedback signal. The external driving device (not shown) determines the position of the magnet 31 relative to the driving coil 410 according to the size of the feedback signal, thereby adjusting the driving signal to form a closed-loop control. The system enables the horizontal linear vibration motor of the present invention to achieve more precise control of the vibration mode. In the present invention, the external connection terminal 402 corresponds to the driving coil 410 and the induction coil 411 respectively, and has the function of connecting to an external power supply and connecting to an external detection device to realize signal transmission and feedback. At the same time, the induction coil 411 of the present invention has a small number of turns, a small volume, a small thickness or a low height, and the coil assembly 41 structure formed by the integrated combination of the induction coil 411 and the driving coil 410 can ensure that the induction coil 411 will not be hit and fail during the reciprocating motion and drop test of the vibrator assembly 3, thereby ensuring the vibration performance and making the vibration feedback more sensitive.

[0036] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "horizontal direction", "vertical direction", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0037] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A horizontal linear vibration motor, comprising a housing, a cover, a vibrator assembly, a stator assembly, and an elastic member. The housing and the cover are buckled together to form an accommodating space. The vibrator assembly is connected to the housing by fixing the elastic members on both sides thereof and is suspended in the accommodating space. The stator assembly is fixed to the cover. The vibrator assembly and the stator assembly are spaced apart from each other. The invention is characterized in that: The stator assembly includes a flexible circuit board and a coil assembly. The coil assembly includes a driving coil having a first lead and an induction coil having a second lead. The first lead is electrically connected to the flexible circuit board, and the second lead is signal-connected to the flexible circuit board.

2. The horizontal linear vibration motor according to claim 1, characterized in that: The number of turns of the induction coil is smaller than the number of turns of the driving coil.

3. The horizontal linear vibration motor according to claim 2, characterized in that: The induction coil is arranged outside the driving coil.

4. The horizontal linear vibration motor according to claim 2, characterized in that: The driving coil is arranged outside the induction coil.

5. The horizontal linear vibration motor according to claim 3 or 4, characterized in that: The vertical height and horizontal thickness of the induction coil are both smaller than or equal to the vertical height and horizontal thickness of the drive coil.

6. The horizontal linear vibration motor according to claim 2, characterized in that: The induction coil is fixed on the upper surface of the driving coil.

7. The horizontal linear vibration motor according to claim 2, characterized in that: The induction coil is fixed on the lower surface of the driving coil.

8. The horizontal linear vibration motor according to claim 6 or 7, characterized in that: The horizontal area and vertical thickness of the induction coil are both smaller than or equal to the horizontal area and vertical thickness of the drive coil.

9. The horizontal linear vibration motor according to claim 1, characterized in that: The vibrator assembly includes a mass block, a magnetic steel and a pole piece embedded in the mass block, and a damping member fixed on both sides of the mass block and located between the mass block and the elastic member.

10. The horizontal linear vibration motor according to claim 9, characterized in that: The flexible circuit board includes an internal connection end and an external connection end. The internal connection end is located in the accommodating space and is respectively connected to the first lead and the second lead. The external connection end extends outside the accommodating space.

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