WO2020077845A1

WO2020077845A1 - Electromagnetic exciter and screen sound production apparatus

Info

Publication number: WO2020077845A1
Application number: PCT/CN2018/123671
Authority: WO
Inventors: 刘春发; 朱跃光; 毛东升; 臧玮晔
Original assignee: 歌尔股份有限公司
Priority date: 2018-10-16
Filing date: 2018-12-26
Publication date: 2020-04-23
Also published as: CN109309892B; CN109309892A

Abstract

Disclosed are an electromagnetic exciter and a screen sound production apparatus. The exciter comprises: a stator assembly comprising a housing and a coil (20), with a cavity being formed inside the housing, and the coil (20) being arranged in the cavity; and an oscillator assembly comprising an integrally formed multi-pole magnetizing permanent magnet (23), wherein the multi-pole magnetizing permanent magnet (23) has multiple magnetic parts (17, 18, 19), magnetic force lines of the multiple magnetic parts (17, 18, 19) are configured to be joined with each other to form a magnetic loop together, and the two magnetic parts respectively arranged at two ends, in a vibrating direction, of the multi-pole magnetizing permanent magnet (23) have polarities pointing towards the coil and opposite each other; the oscillator assembly cooperates with the coil; and the oscillator assembly is connected to an elastic element and suspended in the cavity by means of the elastic element.

Description

Electromagnetic exciter and screen sounding device

Technical field

The utility model relates to the technical field of electroacoustic conversion, and more specifically, to an electromagnetic exciter and a screen sounding device.

Background technique

In order to increase the screen ratio of mobile phones and other electronic products (that is, the ratio of screen area to frontal area), the cancellation of the earpiece has become a development trend. In some solutions, a screen sounding device is used instead of the earpiece. The screen sounding device generally includes a screen body and an electromagnetic actuator provided on the screen body. The electromagnetic exciter vibrates, which causes the screen body to vibrate to make a sound.

Existing electromagnetic exciters usually include a stator, a vibrator, and a shrapnel. The stator includes a housing and a coil. The vibrator includes a permanent magnet and a mass connected together. The vibrator is suspended in the cavity of the housing through the elastic sheet. The coil is fixed on the inner wall of the housing.

In such a structure, a permanent magnet with a unidirectional polarity or multiple permanent magnets in combination with multiple polarities are usually provided.

The magnetization direction of the permanent magnet is uniform, usually parallel to the vibration direction or perpendicular to the vibration direction. The magnetic field utilization rate of this electromagnetic actuator is low, the driving force is small, and the sensitivity is low.

Therefore, it is necessary to provide a new technical solution to solve the above technical problems.

Summary of the invention

An object of the present invention is to provide a new technical solution for an electromagnetic actuator.

According to a first aspect of the invention, an electromagnetic actuator is provided. The exciter includes a stator assembly including a housing and a coil, a cavity is formed inside the housing, and the coil is disposed in the cavity; a vibrator assembly including an integrally formed unit A multi-pole magnetized permanent magnet having a plurality of magnetic parts, and the magnetic lines of the plurality of magnetic parts are configured to be connected to each other to jointly form a magnetic circuit, respectively located in the multi-pole magnetized The polarities of the two magnetic parts of the two ends of the permanent magnet in the vibration direction point to the coil, and the polarities are opposite, and the vibrator assembly cooperates with the coil; and the elastic element, the vibrator assembly and the The elastic element is connected and suspended in the cavity by the elastic element.

Optionally, the vibrator assembly further includes a weight portion, the weight portion is connected to the multi-pole magnetized permanent magnet, and the elastic element is connected to the weight portion.

Optionally, two weight parts are provided, and the weight parts correspond to the elastic elements in one-to-one relationship; the multi-pole magnetized permanent magnet includes a long side and a short side, and the long side and the vibration direction Vertically, the two weight parts are respectively provided at the two ends of the long side.

Optionally, notches are formed at both ends of the long side respectively, the two notches are center symmetrical with respect to the geometric center of the multi-pole magnetized permanent magnet, and the two weight parts are respectively disposed at two In the gap.

Optionally, the multi-pole magnetized permanent magnet is divided into a first magnetic part, a third magnetic part, and a second magnetic part along the vibration direction, and the first magnetic part and the second magnetic part are respectively located in the multi-pole Two ends of the pole magnetized permanent magnet along the vibration direction, the magnetization direction of the third magnetic part is parallel to the vibration direction, and the magnetization directions of the first magnetic part and the second magnetic part are perpendicular to the vibration direction , And the magnetization direction is opposite.

Optionally, when magnetizing, the third magnetic part is first magnetized, and then the first magnetic part and the second magnetic part are magnetized.

Optionally, the housing includes a top wall and a bottom wall that are oppositely arranged in the vibration direction, and at least one of the top wall and the bottom wall is provided with a boss protruding toward the cavity. One end of the elastic element is fixed on the boss.

Optionally, a plurality of vibrator assemblies are included, and the number of the vibrator assemblies is one more than the number of the coils, and the vibrator assemblies and the coils are alternately arranged.

Optionally, a plurality of coils are included, the number of the coils is one more than the number of the vibrator assemblies, and the coils and the vibrator assemblies are alternately arranged.

According to a second aspect of the present disclosure, a screen sounding device is provided. The device includes a screen body and the above-mentioned electromagnetic exciter, and the electromagnetic exciter is provided on the screen body.

Optionally, the electromagnetic exciter is provided on the screen body through an elastic buffer element.

According to an embodiment of the present disclosure, the electromagnetic exciter has the characteristics of high sensitivity, fast vibration speed, and good vibration sensing experience.

Other features and advantages of the present invention will become clear through the following detailed description of exemplary embodiments of the present invention with reference to the drawings.

BRIEF DESCRIPTION

The drawings incorporated in and forming a part of the specification illustrate embodiments of the invention, and together with the description thereof, serve to explain the principles of the invention.

FIG. 1 is an exploded view of an electromagnetic exciter according to an embodiment of the present disclosure.

2 is a cross-sectional view of an electromagnetic exciter according to an embodiment of the present disclosure.

3 is a cross-sectional view of an electromagnetic exciter at another angle according to an embodiment of the present disclosure.

4 is a schematic diagram of an electromagnetic exciter according to an embodiment of the present disclosure.

Description of reference signs:

11: upper shell; 12: middle shell; 13: first shrapnel; 14: first metal block; 15: second shrapnel; 16: second metal block; 17: first magnetic part; 18: second magnetic part; 19: third magnetic part; 20: coil; 21: FPCB; 22: lower case; 23: multi-pole magnetized permanent magnet; 25: long side wall; 26: short side wall.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is actually merely illustrative, and in no way serves as any limitation on the invention and its application or use.

Techniques, methods and equipment known to those of ordinary skill in the related art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the specification.

In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiment may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, therefore, once an item is defined in one drawing, there is no need to discuss it further in subsequent drawings.

According to an embodiment of the present disclosure, an electromagnetic exciter is provided. As shown in FIG. 1, the exciter includes a stator assembly, a vibrator assembly, and an elastic element.

The stator assembly includes a housing and coil 20. The interior of the housing forms a cavity. The coil 20 is provided in the cavity.

As shown in Fig. 1, the casing has a rectangular parallelepiped structure. The shell includes an upper shell 11, a middle shell 12 and a lower shell 22 that are snapped together. Form cavities inside them. The middle shell 12 includes a top wall, a bottom wall, and two oppositely arranged short side walls 26 connecting the top wall and the bottom wall. The length of the top and bottom walls is greater than the length of the two short side walls. The top wall, bottom wall, upper shell 11 and lower shell 22 are long side walls 25. The length of the long side wall 25 is greater than the length of the short side wall 26.

The coil 20 is adhered to the lower case 22 by glue. The coil 20 is electrically connected to an external circuit through the FPCB 21. For example, the coil 20 has a flat structure to save space inside the cavity.

As shown in FIG. 4, the vibrator assembly includes an integrally formed multi-pole magnetized permanent magnet 23. The multi-pole magnetized permanent magnet 23 is a ferrite magnet, a neodymium iron boron magnet, or the like. For example, the multi-pole magnetized permanent magnet 23 is integrally formed through steps such as preparation, casting, and sintering. The multi-pole magnetized permanent magnet 23 may be a bar magnet, a round magnet, an arc magnet, or the like.

The multi-pole magnetized permanent magnet 23 has a plurality of

magnetic portions

17, 18, and 19. The magnetic force lines of the plurality of

magnetic parts

17, 18, and 19 are configured to be connected to each other to jointly constitute a magnetic circuit. The polarities of the two magnetic parts at the two ends of the multi-pole magnetized permanent magnet 23 in the vibration direction are directed to the coil, and the polarities are opposite. The vibrator assembly is connected with the elastic element, and is suspended in the cavity through the elastic element. For example, the pointing coil means that the direction of the magnetic field lines is perpendicular or substantially perpendicular to the main plane of the coil.

In this way, the magnetic induction strength of the vibrator assembly can be effectively improved. The vibrator assembly and the coil 20 cooperate with each other to vibrate. That is, the coil 20 is subjected to electromagnetic force after being energized. The vibrator assembly receives the reaction force of the coil 20 to generate vibration.

In one example, as shown in FIGS. 1-4, the multi-pole magnetized permanent magnet 23 is divided into a first magnetic portion 17, a third magnetic portion 19, and a second magnetic portion 18 in the vibration direction. The first magnetic portion 17 and the second magnetic portion 18 are respectively located at both ends of the multipole magnetized permanent magnet 23 in the vibration direction. The magnetization direction of the third magnetic portion 19 is parallel to the vibration direction. The magnetization directions of the first magnetic portion 17 and the second magnetic portion 18 are perpendicular to the vibration direction, and the magnetization directions are opposite. The direction of vibration is shown by arrow A in Figure 2.

In this example, as shown in FIGS. 2 or 4, the coil is located on the side of the multi-pole magnetized permanent magnet 23 so that both the first magnetic portion 17 and the second magnetic portion 18 point toward the coil. In the initial state, the current direction of the coil portion corresponding to the first magnetic portion 17 is opposite to the current direction of the coil portion corresponding to the second magnetic portion 18, so that the multi-pole magnetized permanent magnet 23 receives the coil 20 differently The driving force of the parts is in the same direction.

Of course, the magnetization method of the multi-pole magnetization permanent magnet is not limited to the above embodiment, as long as it can form a magnetic circuit. A person skilled in the art can set the position of the coil 20 according to actual needs, so as to facilitate cooperation with the vibrator assembly.

For example, the side wall of the housing is parallel to the vibration direction. The coil 20 is provided on the long side wall 25, for example, on the lower case 22. The long axis of the coil 20 is parallel to the upper shell 11 and the lower shell 22. This arrangement makes the area where the coil 20 interacts with the vibrator assembly larger, and the driving force of the vibrator assembly greater.

In addition, the space occupied by the coil 20 is small.

In one example, when magnetizing, the third magnetic portion 19 is magnetized first. Then, the first magnetic portion 17 and the second magnetic portion 18 are magnetized. For example, first, the magnetizing coil is arranged in a vertical direction to magnetize the entire base material of the multi-pole magnetizing permanent magnet 23. Then, the magnetizing coils are arranged in a horizontal direction to magnetize both end portions of the base material, respectively, to form the first magnetic portion 17 and the second magnetic portion 18. In this step, the action area of the magnetizing coil is controlled to prevent the middle portion of the multi-pole magnetizing permanent magnet 23, that is, the third magnetic portion 19 from being interfered. After the magnetization is completed, a multi-pole magnetized permanent magnet 23 is formed.

Of course, the magnetic part and the magnetization method of the multi-pole magnetized permanent magnet 23 are not limited to the above embodiments, and those skilled in the art may set it according to actual needs.

In the embodiment of the present disclosure, the vibrator assembly includes an integrally formed multi-pole magnetized permanent magnet 23. The multi-pole magnetized permanent magnet 23 has a plurality of magnetic parts. The magnetic lines of the plurality of magnetic parts are configured to be connected with each other to jointly constitute a magnetic circuit. The polarities of the two magnetic parts at the two ends of the multi-pole magnetized permanent magnet 23 in the vibration direction point to the coil, and the polarities are opposite. This makes the magnetic intensity of the vibrator assembly effectively increase. The driving force of the electromagnetic actuator of the same volume is effectively improved. The vibration speed of the vibrator assembly is effectively accelerated. The sensitivity of the electromagnetic actuator is significantly improved.

In one example, as shown in FIG. 1 or 3, the vibrator assembly further includes a weight portion. The weight part is connected to the multi-pole magnetized permanent magnet 23. The elastic element is connected to the weight part. For example, the weight portion is a metal block. The weight part is connected with the multi-pole magnetized permanent magnet through glue. The elastic element is a shrapnel. For example, the shrapnel is linear, U-shaped or Z-shaped. The shrapnel is made of metal, for example, the first shrapnel and the second shrapnel. One end of the shrapnel is welded to the corresponding weight part by welding. The weight part increases the mass of the vibrator assembly and improves the vibration feeling of the electromagnetic exciter.

In one example, two weight parts are provided. For example, the first metal block 14 and the second metal block 16. The weight part corresponds to the elastic element one by one. For example, the first elastic piece 13 and the second elastic piece 15. The multi-pole magnetized permanent magnet 23 includes a long side and a short side. The long side refers to the longest side of the multi-pole magnetized permanent magnet 23. The long side is perpendicular to the direction of vibration. The two weight parts are respectively provided at the two ends of the long side. For example, the first metal block and the second metal block are respectively bonded to the two ends of the long side of the multi-pole magnetized permanent magnet 23. With this arrangement, the assembly of the counterweight is easier.

In addition, the weight portion does not occupy space in the vibration direction. The vibration margin of the electromagnetic actuator is larger.

In one example, notches (not shown) are formed at both ends of the long side, respectively. The two gaps are centrosymmetric with respect to the geometric center of the multi-pole magnetized permanent magnet. The two weight parts are respectively provided in the two notches.

For example, the first magnetic portion 17 is blanked at one end to form a first notch. The first metal block 14 is fixed in the first notch. For example, bonding by glue. The second magnetic portion 18 is subjected to material removal processing at the end opposite to the first notch to form a second notch, and the second metal block 16 is fixed in the second notch. For example, bonding by glue.

By fixing the metal block in the corresponding notch, the space occupied by the metal block can be effectively reduced, which makes the vibration margin of the vibrator assembly larger. The amplitude of the electromagnetic exciter is larger and the vibration feeling is stronger.

In one example, as shown in FIG. 3, the upper surface of the first metal block 14 is flush with the upper surface of the first magnetic portion 17. The lower surface of the second metal block 16 is flush with the lower surface of the second magnetic portion 18. One end of the first elastic piece 13 is welded to the upper surface of the first metal block 14. One end of the second elastic piece 15 is welded to the lower surface of the second metal block 16.

This arrangement makes the connection structure of the vibrator assembly and the elastic element more regular, makes full use of the space inside the cavity, and the vibration effect is more excellent.

Under normal circumstances, the shrapnel is directly connected to the inner wall of the housing. For example, one end of the shrapnel is welded to the inner wall of the housing by welding. When vibrating, the vibrator assembly easily collides with the sound of the housing, thereby forming noise.

In one example (not shown), a boss projecting toward the cavity is provided on the top wall. The other end of the first elastic body is fixed on the boss.

and / or

A boss projecting toward the cavity is provided on the bottom wall. The other end of the second elastic body is fixed on the boss.

For example, bosses are respectively formed in the middle of the two long side walls 25 of the middle case 12. The first elastic piece 13 and the second elastic piece 15 are welded to the two bosses respectively. During vibration, the boss and the corresponding other part of the inner wall form a height difference. The height difference provides space for the vibration of the vibrator assembly. This method can effectively reduce the probability of collision between the vibrator assembly and the housing.

In one example, the electromagnetic exciter includes multiple vibrator assemblies. The number of vibrator assemblies is one more than the number of coils 20. The vibrator assembly and the coil 20 are alternately arranged.

It may also be that the electromagnetic exciter includes a plurality of coils 20. The number of coils 20 is one more than the number of vibrator assemblies. The coil 20 and the vibrator assembly are alternately arranged. The above setting method can significantly improve the vibration sensing experience of the electromagnetic actuator.

A person skilled in the art can select the number of coils 20 and vibrator assemblies according to actual needs.

According to another embodiment of the present disclosure, a screen sounding device is provided. The device includes a screen body and the above-mentioned electromagnetic actuator. The electromagnetic actuator is provided on the screen body.

The screen sounding device has the characteristics of high sensitivity, loudness and good sounding effect.

In one example, the electromagnetic actuator is provided on the screen body through the elastic buffer element. The elastic buffer element may be foam, sponge, rubber, silicone, plastic and other elastic materials. The elastic buffer element can effectively buffer the impact of the electromagnetic exciter on the screen body and improve the durability of the screen sounding device.

In addition, the elastic buffer element can play a role of heat insulation, which can prevent the heat of the electromagnetic actuator from being transmitted to the screen body, causing burns.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims

An electromagnetic exciter, which is characterized by comprising:

A stator assembly, the stator assembly includes a housing and a coil, a cavity is formed inside the housing, and the coil is disposed in the cavity;

A vibrator assembly comprising an integrally formed multi-pole magnetized permanent magnet, the multi-pole magnetized permanent magnet has a plurality of magnetic parts, and magnetic lines of the plurality of magnetic parts are configured to be mutually connected to form a common structure Magnetic circuit, the polarities of the two magnetic parts at the two ends of the multi-pole magnetized permanent magnet in the vibration direction point to the coil, and the polarities are opposite, and the vibrator assembly cooperates with the coil ;as well as

An elastic element, the vibrator assembly is connected to the elastic element, and is suspended in the cavity by the elastic element.
The electromagnetic exciter according to claim 1, wherein the vibrator assembly further includes a weight portion, the weight portion is connected to the multi-pole magnetized permanent magnet, and the elastic element is connected to the weight部连接。 Department connection.
The electromagnetic exciter according to claim 2, wherein two weight parts are provided, the weight parts correspond one-to-one with the elastic element; the multi-pole magnetized permanent magnet includes long sides And the short side, the long side is perpendicular to the vibration direction, and the two weight parts are respectively provided at the two ends of the long side.
The electromagnetic exciter according to claim 3, wherein notches are formed at both ends of the long side, and the two notches are center-symmetrical with respect to the geometric center of the multi-pole magnetized permanent magnet, The weight parts are respectively disposed in the two notches.
The electromagnetic actuator according to claim 1, wherein the multi-pole magnetized permanent magnet is divided into a first magnetic portion, a third magnetic portion, and a second magnetic portion along the vibration direction, and the first magnetic portion and The second magnetic part is located at both ends of the multi-pole magnetized permanent magnet in the vibration direction, the magnetization direction of the third magnetic part is parallel to the vibration direction, and the first magnetic part and the first The magnetization direction of the two magnetic parts is perpendicular to the vibration direction, and the magnetization direction is opposite.
The electromagnetic actuator according to claim 5, wherein when magnetizing, the third magnetic part is first magnetized, and then the first magnetic part and the second magnetic part are magnetized .
The electromagnetic exciter according to claim 1, wherein the housing includes a top wall and a bottom wall oppositely arranged in a vibration direction, and a direction is provided on at least one of the top wall and the bottom wall A boss of the cavity protrudes, and one end of the elastic element is fixed on the boss.
The electromagnetic exciter according to claim 1, characterized by comprising a plurality of vibrator assemblies, the number of the vibrator assemblies being one more than the number of the coils, the vibrator assemblies and the coils being alternately arranged.
The electromagnetic exciter according to claim 1, characterized by comprising a plurality of coils, the number of the coils is one more than the number of the vibrator assemblies, and the coils and the vibrator assemblies are alternately arranged.
A screen sounding device, characterized by comprising a screen body and the electromagnetic exciter according to any one of claims 1-9, the electromagnetic exciter being provided on the screen body.
The screen sound generating device according to claim 10, characterized in that the electromagnetic exciter is provided on the screen body through an elastic buffer element.