WO2022143047A1

WO2022143047A1 - Vibration exciter

Info

Publication number: WO2022143047A1
Application number: PCT/CN2021/136140
Authority: WO
Inventors: 史德璋; 王永强; 毛东升
Original assignee: 歌尔股份有限公司
Priority date: 2020-12-30
Filing date: 2021-12-07
Publication date: 2022-07-07
Also published as: CN112752203A

Abstract

Disclosed is a vibration exciter, comprising a coil assembly and a magnetic circuit assembly. The coil assembly comprises a coil. The coil encloses to form a mounting space. The magnetic circuit assembly is located in the mounting space. The magnetic circuit assembly comprises a central washer, a magnetically insulative electrically conductive frame and a magnet. The magnet is disposed on two sides of the central washer along the axial direction of the coil. The two faces of the magnet which are close to the central washer have the same magnetic pole. The magnetically insulative electrically conductive frame is sleeved on the outer side of the central washer. A gap exists between the coil assembly and the magnetic circuit assembly. The technical solution of the present disclosure can obtain higher loudness in a high-frequency band, and improve the sound production effect.

Description

Vibration exciter

technical field

The invention relates to the technical field of vibration motors, in particular to a vibration exciter.

Background technique

The full screen of the mobile phone can realize the function of the earpiece or speaker without opening. At present, the sound of the full screen is driven by the vibration of the electromagnetic effect of the exciter to drive the screen to vibrate, and the sound is completed by the vibration of the screen. However, the loudness of the sound in the high frequency band is low, resulting in a poor sound effect in the high frequency band.

SUMMARY OF THE INVENTION

Based on this, in view of the existing method of using the vibration of the exciter to drive the sound of the screen, the loudness in the high frequency band is low, resulting in poor sound effect. Get higher loudness and improve sounding.

In order to achieve the above purpose, a vibration exciter proposed by the present invention, the vibration exciter comprises:

a coil assembly, the coil assembly including a coil surrounding an installation space; and

A magnetic circuit assembly, the magnetic circuit assembly is located in the installation space, the magnetic circuit assembly includes a central washer, a magnetically insulating conductive frame and a magnet, and the magnet is arranged in the center along the axial direction of the coil On both sides of the washer, the two magnetic poles of the magnet close to the central washer are the same, the magnetically insulating conductive frame is sleeved outside the central washer, and there is a gap between the coil assembly and the magnetic circuit assembly.

Optionally, the magnetic circuit assembly further includes a magnetically insulated conductive plate, the magnetically insulated conductive plate is connected to the magnetically insulated conductive frame, the magnetically insulated conductive plate and the magnetically insulated conductive frame form a basin, and the center The washer is arranged in the pelvic cavity.

Optionally, the magnetic circuit assembly further includes two vibrator washers, and the vibrator washers are arranged at the ends of the two magnets away from each other.

Optionally, the two magnets are at least partially disposed relative to the central washer.

Optionally, the coil assembly includes a magnetic conductive frame disposed on the outer wall of the coil, the magnetic conductive frame includes a middle shell, an upper frame and a lower frame, and the middle shell is arranged on the outer wall of the coil. , the upper frame and the lower frame are arranged at both ends of the middle shell, and the upper frame and the lower frame are arranged along the periphery of the coil.

Optionally, the side surface of the coil is a first sticking surface, the end surface of the coil is a second sticking surface, the coil is arranged on the inner side of the middle shell through the first sticking surface, and the coil passes through the first sticking surface. The second sticking surface is arranged on the upper frame and the lower frame.

Optionally, the vibration exciter further includes an end cover plate and an elastic member arranged in the axial direction of the coil, and the elastic member is arranged between the end cover plate and the magnetic circuit assembly.

Optionally, the elastic member includes at least two symmetrically arranged limiting portions, the elastic member includes at least two symmetrically arranged limiting portions, and the magnetic circuit assembly is provided with a limiting groove facing the limiting portions, and the The limiting portion is arranged in the limiting groove.

Optionally, the vibration exciter further includes a gasket, and the gasket is arranged between the end cover plate and the magnetic circuit assembly.

Optionally, the vibration exciter further includes a circuit board, the circuit board is hollowed out, and the circuit board is covered on the end face of the coil.

In the technical solution proposed by the present invention, the magnet generates a magnetic field, and the magnetic field of the magnet penetrates the coil. After the coil is energized, according to the left-hand rule, the Lorentz force is generated, that is, the driving force. The driving force drives the magnet to move. When the alternating current is turned on in the coil, the direction of the energized current is switched between forward and reverse, and thus the direction of the driving force is also switched between the opposite two directions. The magnet realizes reciprocating movement under the action of the driving force, and the high-frequency movement forms the vibration of the magnet. There is a gap between the coil assembly and the magnetic circuit assembly, which provides a vibration space for vibration. Among them, the magnet passes through the central washer's line-gathering action, and the magnetic field lines at one end of the magnet radiate to the surrounding through the central washer. The central washer is set in the magnetically insulated conductive frame, and the insulated conductive frame reduces the inductive reactance of the coil, thereby reducing the vibration exciter. impedance, so that the vibration exciter has a higher loudness in the high frequency band. Through the high loudness of the vibration exciter in the high frequency band, the volume decibel of the vibration exciter in the high frequency band is increased, so that the sounding effect of the vibration exciter in the high frequency band is improved.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.

1 is a schematic diagram of an explosion structure of an embodiment of the vibration exciter of the present invention;

2 is a schematic cross-sectional view of an embodiment of the vibration exciter of the present invention;

FIG. 3 is a schematic diagram of the installation structure of the elastic member in the vibration exciter of the present invention.

Description of reference numbers:

标号label	名称 name	标号label		名称name
111111	中壳 middle shell	240240	振子华司Vibrator Wasi
112112	上边框 top border	241241	限位槽 Limit slot
113113	下边框 lower border	310310	端盖板 end cap
120120	线圈 coil	410410	弹性件elastic
210210	磁铁magnet	411411	限位部Limiting part
220220	中心华司 center washer	510510	垫片 Gasket
231231	绝磁导电框Magnetically insulated conductive frame	610610	电路板 circuit board
232232	绝磁导电板Magnetically insulated conductive plate

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, descriptions such as "first", "second", etc. in the present invention are only used for description purposes, and should not be interpreted as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "connected", "fixed" and the like should be understood in a broad sense, for example, "fixed" may be a fixed connection, a detachable connection, or an integrated; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal communication between two elements or an interaction relationship between the two elements, unless otherwise explicitly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Vibration exciter In the related technology of vibration exciter, the loudness in the high frequency band is low, that is to say, the decibel number of the sound in the high frequency band is low, and the sound volume is low, resulting in a poor sound effect.

In order to solve the above problems, referring to FIG. 1 , the present invention provides a vibration exciter, which can be used on various electronic devices, such as smart phones or tablet computers, and drives the smart phone or tablet computer through the vibration exciter. The screen on the screen vibrates to complete the transmission of sound. The vibration exciter includes: coil assembly and magnetic circuit assembly. Among them, the coil assembly generates current, and the current is alternating current. The magnetic circuit assembly generates a magnetic field, and the magnetic field lines of the magnetic field pass through the coil assembly, and according to the left-hand rule, the Lorentz force is generated.

The coil assembly includes a coil 120, and the coil 120 is surrounded to form an installation space. The coil 120 is a spiral shape of a wire that can be energized, and the coil 120 is surrounded to form an installation space. When the coil is energized, an induced magnetic field is generated.

A magnetic circuit assembly is located in the installation space, and the magnetic circuit assembly includes a central washer 220 , a magnetically insulating conductive frame 231 and a magnet 210 . The magnets 210 are arranged on both sides of the central washer 220 along the axial direction of the coil 120. The two faces of the magnet 210 close to the central washer 220 have the same magnetic poles. The magnetically insulating conductive frame 231 is sleeved on the outside of the central washer 220. There is a gap between the magnetic circuit components. Through the gap, the coil assembly and the magnetic circuit assembly avoid mutual interference when vibrating, so as to provide sufficient vibration space. Wherein, the magnetically insulating conductive frame 231 refers to a material with lower magnetic permeability and higher conductivity, or a non-magnetic material. For example, red copper, red copper is not magnetic, but has good electrical conductivity. The magnetic field lines emitted by the magnet pass through the center washer 220, and the center washer 220 can effectively gather the magnetic field lines and spread the magnetic field lines around. Although the magnetic permeability of the insulating conductive frame 231 is low, it does not affect the passing of the magnetic field lines. The magnet 210 forms a magnetic field passing through the coil 120 , and the coil 120 is energized to generate a driving force to drive the magnet 210 or the coil 120 to move. The magnet 210 is a component with magnetic poles and is a permanent magnet. The structure shape of the magnet 210 includes various shapes, such as circular and square. After the coil 120 is connected to the alternating current, due to the positive and negative directions of the alternating current, the current in the coil 120 also has two flowing directions: positive and negative. Therefore, the Lorentz force also has two application directions, and a driving force of reciprocating vibration is formed in the switching of the two application directions. Through such high frequency switching, the driving magnet 210 or the coil 120 forms a vibration effect.

In the technical solution proposed in this embodiment, the magnet 210 generates a magnetic field, and the magnetic field of the magnet 210 penetrates the coil 120 . After the coil 120 is energized, according to the left-hand rule, a Lorentz force, that is, a driving force, is generated. The driving force drives the magnet 210 to move. When the alternating current is turned on in the coil 120 , the direction of the energized current is directly switched between forward and reverse, whereby the direction of the driving force is also switched between the opposite two directions. The magnet 210 realizes the reciprocating movement under the action of the driving force, the high frequency movement causes the vibration of the magnet 210, and there is a gap between the coil assembly and the magnetic circuit assembly, which provides a vibration space for vibration. Among them, the magnet 210 is subjected to the converging action of the central washer 220, and the magnetic field lines at one end of the magnet 210 radiate to the surrounding through the central washer 220. The central washer 220 is arranged in the magnetically insulating conductive frame 231, and the insulating conductive frame 231 reduces the inductance of the coil 120. Therefore, the impedance of the vibration exciter is reduced, so that the vibration exciter has a higher loudness in the high frequency band. Through the high loudness of the vibration exciter in the high frequency band, the volume decibel of the vibration exciter in the high frequency band is increased, so that the sounding effect of the vibration exciter in the high frequency band is improved.

Further, when the position of the coil assembly is fixed, the Lorentz force acts on the magnetic circuit assembly, and the magnetic circuit assembly completes the vibration. When the magnetic circuit assembly is fixed, the Lorentz force acts on the coil assembly, and the coil assembly completes the vibration. Therefore, according to the specific installation situation of the vibration exciter, the fixed coil assembly or the magnetic circuit assembly can be selected, so that the magnetic circuit assembly or the coil assembly can be vibrated.

Further, in order to transmit the sound more clearly, the coil assembly or the magnetic circuit assembly can be directly abutted on the screen, so that the vibration of the coil assembly or the vibration of the magnetic circuit assembly is directly transmitted to the screen, thereby driving the screen to vibrate. Sound is transmitted by generating mechanical waves through the vibration of the screen. Through the direct contact of the coil assembly or the magnetic circuit assembly with the screen, the sound can be transmitted more clearly, without considering the resonant frequency of the screen.

Further, the magnetic field lines of the magnetic field are denser at the position where the two magnets 210 are butted, which increases the number of magnetic field lines passing through the coil 120 . In addition, the magnetic lines of force extend toward the outer ends of the magnets 210 when the same poles are opposite to each other. It is determined by the left-hand rule that the two magnets 210 can move in the same direction when the two magnets 210 are opposite to each other. The magnetic poles of the magnetic field include N poles and S poles. The N poles of the two magnets 210 may be opposite to each other, or the S poles of the two magnets 210 may be opposite to each other. The central washer 220 brings together the opposite poles of magnetic field lines and spreads them all around. As shown in Fig. 2, the black arrow is the conduction direction of the magnetic force line, and it can be seen that a closed magnetic circuit is formed. The center washer 220 has the function of conducting magnetic lines of force, and the magnetic lines of force of the two magnets 210 extend along the center washer 220, so as to close the divergent magnetic lines of force, thereby increasing the magnetic field strength. It can be understood that the center washer 220 has the effect of expanding the strength of the magnetic field. The magnetic force of the two magnets 210 is the same, and the central washer 220 also has the function of balancing the magnetic force of the two magnets 210, so as to avoid the vibration unbalance of the vibration exciter and avoid the phenomenon of over-attraction or over-repulsion.

In the above embodiment, in order to facilitate the assembly of the vibration exciter, the magnetic circuit assembly further includes a magnetically insulating conductive plate 232, which is connected to the magnetically insulating conductive frame 231, and the magnetically insulated conductive plate 232 and the magnetically insulated conductive frame. 231 forms a pelvic cavity, and the central washer 220 is arranged in the pelvic cavity. Therefore, when the central washer 220 is installed, the central washer 220 is directly placed in the pelvic cavity, and the assembly of the central washer 220 is completed by being placed in the pelvic cavity. Further, the size of the inner wall surface of the pelvic cavity and the side wall surface of the central washer 220 is adapted, and when the central washer 220 is placed, the central washer 220 can be more securely installed in the pelvic cavity. In addition, glue can also be arranged in the pelvic cavity, and when the central washer is arranged in the pelvic cavity, the viscous force of the glue can improve the fastening degree of the central washer 220 . The magnetically insulating conductive plate 232 and the magnetically insulating conductive frame 231 can be integrally processed and formed, for example, by punching, directly punching to form the basin.

In addition, there are two magnetically insulating conductive plates 232, and the two surfaces of the central washer 220 are provided with magnetically insulating conductive plates 232. The two magnetically insulating conductive plates 232 and the magnetically insulating conductive frame 231 connect the center washer 220 to each other. 220 wrapped up.

In the above embodiment, in order to further close the magnetic field lines of the magnet 210, the overflow of the magnetic field lines is reduced. The magnetic circuit assembly further includes two vibrator washers 240 . The vibrator washers 240 are disposed at the ends of the two magnets 210 away from each other, and the vibrator washers 240 are made of magnetically conductive material. That is to say, the oscillator washer 240 is disposed outside the magnet 210, and the oscillator washer 240 is also a magnetic conductive material. When the magnetic field lines of the magnet 210 pass through the oscillator washer 240, the magnetic field lines are gathered by the oscillator washer 240, thereby forming a closed magnetic field loop, reducing the overflow of the magnetic field lines, and avoiding affecting the work of other equipment.

Further, the two magnets are arranged at least partially relative to the central washer, and the generated magnetic lines of force of the magnets are at least partially arranged opposite to each other, which can ensure that the magnetic lines of force of the magnets pass through the central washer. The greater the relative area, the greater the number of magnetic lines of force passing through, and the more magnetic lines of force gathered by the central washer. For example, in order to allow the maximum number of magnetic lines of force to pass through, it can be ensured that the magnets are placed directly on the center washer.

In an embodiment of the present application, the coil assembly includes a magnetic conductive frame, and the magnetic conductive frame is surrounded by an outer wall surface of the coil. The magnetic field lines of the induced magnetic field are gathered by the magnetic permeability of the magnetic conductive frame, thereby reducing the overflow of the magnetic field lines of the induced electric field. It can also be understood that the magnetic conductive frame forms a shielding layer. Among them, there are many choices for the magnetic conductive material of the magnetic conductive frame, such as iron or low carbon steel and other iron alloys.

Further, in order to collect the induced magnetic field of the coil 120 , the magnetic conductive frame includes a middle case 111 , an upper frame 112 and a lower frame 113 , the middle case 111 is arranged around the outer wall of the coil 120 , and the upper frame 112 and the lower frame 113 are arranged in the middle case At both ends of the coil 111 , the upper frame 112 and the lower frame 113 are arranged along the periphery of the coil 120 . It can be seen that the upper frame 112 and the lower frame 113 cover the end face of the coil 120 , and the magnetic field lines on the end face of the coil 120 are gathered by the upper frame 112 and the lower frame 113 to reduce the overflow of the magnetic field lines. The outer side of the coil 120 is wrapped by the magnetic conductive frame, and the magnetic induction lines generated around the coil 120 are also gathered and converged, which further reduces the overflow of the magnetic induction lines of the coil 120 .

In the above embodiment, in order to make the coil 120 set more firmly, the side surface of the coil 120 is the first sticking surface, the end surface of the coil 120 is the second sticking surface, and the coil 120 is set on the inner side of the middle shell 111 through the first sticking surface. The coil 120 is disposed on the upper frame 112 and the lower frame 113 through the second sticking surface. The side surface and the end surface of the coil 120 are fixed on the magnetic conductive frame, and the sticking area is large, thereby improving the firmness of the coil 120 to be installed. In addition, the setting method of pasting is easy to operate and easy to manufacture.

In order to improve the vibration effect of the vibration exciter, the vibration exciter further includes an end cover plate 310 and an elastic member 410 disposed in the axial direction of the coil 120 , and the elastic member 410 is disposed between the end cover plate 310 and the magnetic circuit assembly 210 . When the magnetic circuit assembly vibrates, the magnetic circuit assembly squeezes the elastic member 410, and the elastic member 410 generates a reaction force. When the magnetic circuit assembly vibrates in the opposite direction, the movement of the magnetic circuit assembly in the opposite direction can be accelerated under the reaction of the elastic member 410. . In addition, the elastic member 410 also has the function of buffering the vibration force to prevent the magnetic circuit assembly from directly hitting the end cover plate 310 .

Further, two elastic members 410 are provided, and the elastic members 410 are respectively arranged at both ends of the coil 120 , so that the magnet 210 is confined inside the coil 120 by the elastic pressure of the elastic members 410 , thereby ensuring the magnetic field lines of the magnet 210 More through the coil 120.

Wherein, the end cover plate 310 is also a magnetic conductive material, which further gathers the convergent and divergent magnetic lines of force and reduces the overflow of the magnetic lines of force.

Referring to FIG. 3, a gap is provided between the coil 120 and the magnet 210 to prevent the inner walls of the magnet 210 and the coil 120 from rubbing against each other when the magnet 210 or the coil 120 vibrates. In order to ensure the size of the gap between the coil 120 and the magnet 210 is stable, the elastic member 410 includes at least two symmetrically arranged limit portions 411 , the magnetic circuit assembly is provided with a limit slot 241 facing the limit portion 411 , and the limit portion 411 is set at the limit portion 411 . The slots 241 are arranged at intervals between the outer side of the magnet 210 and the inner side of the coil 120 . The magnet 210 vibrates reciprocally in a fixed direction through the clamping action of the limiting portion 411 on the limiting slot 241 , so that the magnet 210 and the coil 120 are not rubbed due to vibration deviation. For example, the limiting groove 241 is set on the oscillator washer 240, the oscillator washer 240 and the magnet 210 are fixed together, and one side of the elastic member 410 is fixed on the end cover plate 310, that is to say, the position of the elastic member 410 is fixed. The other side of the elastic member 410 is clamped with the oscillator washer 240 , so that the position of the magnet 210 is also fixed. Furthermore, the magnet 210 can only vibrate in a single reciprocating direction, and will not touch the inner wall of the coil 120 .

In order to further reduce the overflow of the magnetic field lines, the vibration exciter further includes a gasket 510, and the gasket 510 is arranged between the end cover plate 310 and the magnetic circuit assembly. The spacer 510 is also a magnetic conductive material, and the overflow of the magnetic field lines is reduced by the shrinking effect of the spacer 510 . Wherein, the gasket 510 may be disposed between the oscillator washer 240 and the magnetic circuit assembly, or the gasket 510 may be disposed between the oscillator washer 240 and the end cover plate 310 .

In the above-mentioned embodiment, the vibration exciter further includes a circuit board 610 , the circuit board 610 is hollowed out, and the circuit board 610 is covered on the end face of the coil 120 . The hollow arrangement of the circuit board 610 can ensure the smooth vibration of the magnet 210 and prevent the circuit board 610 from covering the vibration path of the magnet 210 . One end of the circuit board 610 extends out of the magnetic conductive frame, so as to ensure that the external current can be conducted into the coil 120 along the circuit board 610 .

In addition, the height of the magnetic conductive frame in the coil assembly is the same as the superimposed height of the magnet 210 , the oscillator washer 240 and the center washer 220 in the magnetic circuit assembly.

In addition, the exciter in the present application can not only be used to produce sound on the screen, but also can be used to generate vibration feedback.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Under the inventive concept of the present invention, the equivalent structure transformation made by using the contents of the description and drawings of the present invention, or directly/indirectly applied to other All relevant technical fields are included in the scope of patent protection of the present invention.

Claims

A vibration exciter, characterized in that the vibration exciter comprises:

a coil assembly, the coil assembly including a coil enclosing an installation space; and

A magnetic circuit assembly, the magnetic circuit assembly is located in the installation space, the magnetic circuit assembly includes a central washer, a magnetically insulating conductive frame and a magnet, and the magnet is arranged in the center along the axial direction of the coil On both sides of the washer, the two magnetic poles of the magnet close to the central washer are the same, the magnetically insulating conductive frame is sleeved outside the central washer, and there is a gap between the coil assembly and the magnetic circuit assembly.
The vibration exciter according to claim 1, wherein the magnetic circuit assembly further comprises a magnetically insulated conductive plate, the magnetically insulated conductive plate is connected to the magnetically insulated conductive frame, and the magnetically insulated conductive plate is connected to the magnetically insulated conductive plate. The magnetically insulating conductive frame forms a pelvic cavity, and the central washer is arranged in the pelvic cavity.
The vibration exciter according to claim 2, wherein the magnetic circuit assembly further comprises two vibrator washers, and the vibrator washers are arranged at the ends of the two magnets away from each other.
The vibration exciter of claim 3, wherein the two magnets are at least partially disposed opposite to the central washer.
The vibration exciter according to any one of claims 1 to 4, wherein the coil assembly comprises a magnetic conductive frame disposed on the outer wall of the coil, and the magnetic conductive frame comprises a middle shell, an upper frame and a lower frame, the middle casing is arranged around the outer wall of the coil, the upper frame and the lower frame are arranged at both ends of the middle casing, the upper frame and the lower frame are arranged along the coil perimeter settings.
The vibration exciter according to any one of claims 1 to 4, wherein the side surface of the coil is a first sticking surface, the end surface of the coil is a second sticking surface, and the coil passes through the first sticking surface. An adhesive surface is arranged on the inner side of the middle shell, and the coil is arranged on the upper frame and the lower frame through the second adhesive surface.
The vibration exciter according to any one of claims 1 to 4, wherein the vibration exciter further comprises an end cover plate and an elastic member arranged in the axial direction of the coil, and the elastic member is arranged in the axial direction of the coil. between the end cover and the magnetic circuit assembly.
The vibration exciter according to claim 7, wherein the elastic member comprises at least two symmetrically arranged limiting portions, and the magnetic circuit assembly is provided with a limiting groove facing the limiting portions, and the limiting portion set in the limiting groove.
The vibration exciter according to claim 7, wherein the vibration exciter further comprises a gasket, and the gasket is provided between the end cover plate and the magnetic circuit assembly.
The vibration exciter according to any one of claims 1 to 4, wherein the vibration exciter further comprises a circuit board, the circuit board is hollowed out, and the circuit board is covered on the end face of the coil .