WO2020135283A1

WO2020135283A1 - Carrier-type exciter device

Info

Publication number: WO2020135283A1
Application number: PCT/CN2019/127240
Authority: WO
Inventors: 祖峰磊; 杨鑫峰; 刘春发
Original assignee: 歌尔股份有限公司
Priority date: 2018-12-29
Filing date: 2019-12-21
Publication date: 2020-07-02
Also published as: CN111384834A

Abstract

A carrier-type exciter device, the carrier-type exciter device comprising an electromagnetic exciter and a load element, the electromagnetic exciter comprising a housing, a magnetically conductive vibrator (25), a coil (16) and a permanent magnet; a cavity being formed in the housing, the permanent magnet, coil (16) and magnetically conductive vibrator (25) being disposed in the cavity, and the load element being disposed outside of the cavity; the magnetically conductive vibrator (25) comprising, connected to one another, a secured end (15) and a suspended end, the secured end (15) being secured on the housing, and a portion of the suspended end being disposed relative to the permanent magnet with a gap between same; the coil (16) being sheathed outside of the suspended portion, the suspended portion comprising a connection portion, the housing having a through-hole, the connection portion extending out through the through-hole, and the connection portion being connected to the load element; the coil (16) generating an alternating magnetic field in response to an alternating signal from an external electric circuit, the magnetically conductive vibrator (25) being magnetized under the effects of the magnetic field, the permanent magnet being configured to interact with the suspended portion in order to drive the vibration of the magnetically conductive vibrator (25), and the magnetically conductive vibrator (25) driving the vibration of the load element.

Description

Carrier type exciter device

Technical field

The present invention relates to the technical field of electromagnetic vibration, and more particularly, to a carrier-type exciter device.

Background technique

There are many types of electromagnetic actuators, which are classified according to principles, including moving coil type, moving magnet type and moving iron type, whose movers are coil, magnet and magnetic armature respectively; according to the transmission mode, including direct drive and resonance formula.

The moving coil type exciter, according to Ampere's law, passes an appropriate current in the coil placed in the magnetic field to make it move under force. The design of this type of exciter is simple and intuitive, which is convenient for optimal adjustment and later maintenance. However, due to the low magnetic field utilization rate, it is difficult to design products with a large excitation force in the case of limited volume.

The moving magnet type exciter can not only use the force of the conducting wire, but also use the force between the multiple permanent magnets and the permanent magnet and the magnetic conductive material to make it move. However, because the position of the moving magnet is not easy to be fixed, it is necessary to always consider the imbalance of the force caused by the nonlinear change caused by the external action of the magnetic field of the permanent magnet. The design is more difficult, and it is not conducive to optimal adjustment and subsequent maintenance.

The moving iron type exciter can use the force of the conducting wire or the force between the permanent magnet and the magnetic mover to make it move, and the movement process will not cause a large change in the magnetic field. It is easy to design products with high incentive and high stability.

Direct drive exciter, the mover is directly connected to the load, and the mover drives the load to move. The transmission of force is relatively direct, mainly relying on the excitation force to stimulate the load movement.

In the resonant exciter, the mover is not connected to the load, and the load moves by the mass of the mover. The transmission of force depends on the mass of the mover. The excitation force belongs to the internal force and is only used to excite the mover.

Therefore, a new technical solution needs to be provided to solve the above technical problems.

Summary of the invention

An object of the present invention is to provide a new technical solution for a carrier-type exciter device.

According to a first aspect of the invention, a carrier-type exciter device is provided. The carrier-type exciter device includes an electromagnetic exciter and a load element. The electromagnetic exciter includes a housing, a magnetic vibrator, a coil, and a permanent magnet. A cavity is formed inside the housing, and the permanent magnet and the coil And the magneto-vibrator is located in the cavity, the load element is located outside the cavity, the magneto-vibrator includes a fixed end and a suspended portion connected to each other, the fixed end is fixed on the housing, A part of the suspended portion is opposed to and spaced from the permanent magnet, the coil is sheathed outside the suspended portion, the suspended portion includes a connecting portion, the housing has a through hole, and the connecting portion The through-hole extends, the connection portion is connected to the load element, the coil generates an alternating magnetic field in response to an alternating signal of an external circuit, and the magneto-vibrator is magnetized under the action of the magnetic field, the The permanent magnet is configured to interact with the suspended portion to drive the vibrator to vibrate, and the vibrator to drive the load element to vibrate.

Optionally, the connection portion is rigidly connected to the load element; or the connection portion is connected to the load element through an elastic connection.

Optionally, the connection portion is connected to the load element through an elastic connection piece, and the elastic connection piece is at least one of a spring, an elastic piece, an elastic rubber piece, and an elastic silicone piece.

Optionally, the magnetic vibrator has an L-shaped structure, and the L-shaped structure includes a first side and a second side connected to each other, the end of the first side is the fixed end, and the coil is sleeved on Outside the first side, the permanent magnet is opposite to the first side, the second side is the connecting portion, and the end of the second side is connected to the load element.

Optionally, a magnetic fluid is provided between the coil and the magnetic vibrator and/or between the permanent magnet and the magnetic vibrator.

Optionally, the shell includes a first shell and a second shell, and the fixed end is clamped and fixed in the shell walls of the first shell and the second shell.

Optionally, the load element is at least one of a diaphragm, a weight, and a plate for sounding.

Optionally, the load element is an LED screen, an LCD screen or an OLED screen.

Optionally, the permanent magnet includes a first magnet and a second magnet that are oppositely arranged on both sides of the magnetic vibrator in the vibration direction.

Optionally, there are multiple permanent magnets, and the multiple permanent magnets form a Helmhertz array.

According to an embodiment of the present disclosure, the carrier-type exciter device has the characteristics of small volume, large amplitude, and good vibration effect.

Other features and advantages of the present invention will become clear by 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 a part of an electromagnetic exciter according to an embodiment of the present disclosure.

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

3 is a cross-sectional view of a second carrier-type exciter device according to an embodiment of the present disclosure.

4 is a cross-sectional view of a third carrier-type exciter device according to an embodiment of the present disclosure.

5 is a cross-sectional view of a fourth carrier-type exciter device according to an embodiment of the present disclosure.

Description of reference signs:

11: first housing; 12; second housing; 13: first magnet; 14: second magnet; 15: fixed end; 16: coil; 17: fixed portion; 19: shielding sheet; 20: gap; 21: first One side; 22: second side; 25: magnetic vibrator; 26: liquid crystal screen; 27: counterweight; 28: FPCB; 29: through hole; 31: spring; 32: diaphragm; 33: DOME.

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, a carrier-type exciter device is provided. As shown in Figures 1 and 2, the carrier-type actuator device includes an electromagnetic actuator and a load element. The electromagnetic exciter includes a housing, a magnetic vibrator 25, a coil 16, and a permanent magnet. A part of the housing serves as the fixed portion 17. The interior of the housing forms a cavity. The magnetic vibrator 25, the coil 16, and the permanent magnet are provided in the cavity. For example, the housing includes a first housing 11 and a second housing 12 that are snapped together. A cavity is formed inside the two

casings

11,12. For example, the entire housing is square. The first housing 11 forms a cavity with an open end. The second housing 12 is closed at the open end. The material of the shell is metal, plastic, ceramic, glass, etc.

For example, the first housing 11 and the second housing 12 are made of magnetically conductive materials. The magnetically conductive material may be, but not limited to, ferrite material, tungsten steel, SPCC, or the like. The above materials have good magnetic permeability. Because the thickness of the permanent magnet is usually small. The magnetization direction is along the thickness direction. In this way, the two magnetic poles easily form a magnetic short circuit. The permanent magnet is provided on the first housing 11 or the second housing 12. Since the two

shells

11 and 12 have a magnetic permeability effect, the occurrence of magnetic short circuit can be effectively avoided, and the magnetism of the permanent magnet can be significantly improved.

The magnetic vibrator 25 includes a fixed end 15 and a suspended portion connected to each other. The magnetically permeable oscillator 25 is made of a magnetically permeable material. The magnetically conductive material is as described above. For example, the magnetic permeator 25 is a strip-shaped sheet structure or other structure.

The fixed end 15 is fixed to the fixed portion 17. The fixing portion 17 may be a component of the electronic terminal where the load exciter is located, such as a frame, an inner wall, etc.; or the fixing end 15 may be fixed on the wall of the housing. The portion of the shell wall for fixing the fixed end 15 is a fixing portion 17. The hanging part is suspended in the cavity to form a cantilever beam structure. For example, as shown in FIGS. 2-5, the fixed end 15 is fixed between the first housing 11 and the second housing 12. It is fixed by bonding, welding and clamping. This makes it possible to firmly fix the magnetic vibrator 25.

It may also be that the fixed end 15 is relatively fixed to the housing by other components. For example, the fixed end 15 is clamped and fixed in the coil 16. The coil 16 is fixed to the case with an adhesive or the like.

The suspended portion is opposed to and spaced from the permanent magnet to form a vibration space. The coil 16 is configured to magnetize the dangling portion. The coil 16 is sheathed outside the suspended portion.

The housing has a through hole 29. For example, a through hole 29 is provided on the side of the case opposite to the fixed portion 17. The connecting portion protrudes from the through hole 29. The load element is located outside the housing. The connection portion is directly or indirectly connected to the load element.

The coil 16 generates an alternating magnetic field in response to an alternating signal of an external circuit, and the magnetic permeator 25 is magnetized by the magnetic field. The permanent magnet is configured to interact with the suspended portion to drive the magnetic permeator 25 to vibrate, and the magnetic permeator 25 drives the load element to vibrate.

The interaction force of the magnetic permeator 25 and the permanent magnet, that is, the driving force, can be calculated by the following formula:

among them,

Where M is the magnetization of the medium, B is the magnetic induction, n is the surface normal vector, μ _r is the relative permeability of the magnetic medium, μ ₀ is the permeability of the vacuum, and S is the area. If it is assumed that the magnetic field is uniform in the magnetic field of the permeator, the above formula can also be expressed in the following simplified form:

It can be seen that the driving force of the magnetic vibrator 25 is proportional to the square of the magnetic induction intensity and the area. Under normal circumstances, it is difficult to increase the area of the magnetic vibrator under the influence of the application environment, and increasing the magnetic induction intensity of the permanent magnet can effectively improve the driving force. For example, a permanent magnet with a higher magnetic induction strength is provided, or multiple permanent magnets are used together to increase the magnetic induction strength. For example, a plurality of permanent magnets form a Halbach array to increase the magnetic induction strength.

In the embodiment of the present invention, the magnetic transducer 25 forms a cantilever structure. The suspended portion is magnetized by the energizing coil 16 and has magnetism. The polarity of the permanent magnet is the same as or opposite to the polarity of the dangling portion, thereby forming a repulsive or attractive force. When the coil 16 is supplied with an alternating current, the magnetic vibrator 25 generates a reciprocating vibration, thereby driving the load element to vibrate. The magnetic field utilization rate of the load exciter is high, the driving force is large, the volume of the magnetic vibrator 25 is small, the amplitude is large, and the vibration effect is good.

The magnetically permeable vibrator 25 of the cantilever structure has a light weight and a small high-frequency attenuation, and can provide stable high-frequency vibration. Moreover, the magnetic vibrator 25 has a larger amplitude at high frequencies and a faster response. In addition, the structure of the cantilever structure is stable, and the magnetic vibrator has a uniform force when vibrating.

In addition, the magnetic vibrator 25 of the cantilever structure will exhibit different vibration modes under the excitation of different frequencies. Vibration modes at different frequencies will increase the vibration amplitude of the magnetic vibrator 25 in this frequency interval, thereby broadening the frequency band of the carrier-type exciter device.

For example, the load element is at least one of a diaphragm 32, a weight 27, and a plate for sounding. As shown in FIG. 2, when the load element is the diaphragm 32, the carrier-type exciter device is used to vibrate and sound. The diaphragm 32 includes a center portion, an edge portion, and a folded ring portion between the edge portion and the center portion. DOME33 is fixed to the center. The end of the connecting part and the central part are fixedly connected by an adhesive.

As shown in FIG. 4, when the load element is a weight 27, the carrier-type exciter device is used to provide electromagnetic vibration, such as a vibration motor. The material of the weight 27 is metal, plastic, ceramic, glass, or the like.

As shown in FIG. 3, when the load element is a plate for sound generation, the carrier-type exciter device is used for vibration sound generation. The board may be the shell wall PCB, FPCB, etc. of the electronic terminal. For example, the material of the shell wall is metal, ceramic, plastic, glass and other materials.

Preferably, the load element is a liquid crystal screen 26. For example, LED screen, LCD screen, OLED screen, etc. The electromagnetic actuator drives the liquid crystal screen 26 to vibrate and sound.

In one example, as shown in FIGS. 2-4, the connection portion is rigidly connected to the load element. For example, the connection part is directly bonded to the load element by an adhesive. In this connection mode, the vibration of the magnetic vibrator 25 is directly transmitted to the load element, and the transmission efficiency is high.

It may also be that the connection part is connected to the load element by a rigid material. Rigid materials include metals, glass, ceramics, wood, etc.

In one example, as shown in FIG. 5, the connection portion is connected to the load element through an elastic connection. The elastic connector can be elastically deformed and has low rigidity. A flexible connection is formed between the connection part and the load element. The flexible connection mode can change the vibration mode of the magnetic vibrator 25, reduce the resonance frequency of the carrier-type exciter device, and improve the low-frequency effect of the carrier-type exciter device.

For example, the elastic connecting member may be, but not limited to, at least one of a spring 31, an elastic piece, an elastic rubber member, and an elastic silicone member. All of the above materials can undergo elastic deformation.

In one example, as shown in FIGS. 2-5, the dangling portion passes through the coil 16 and out of one end of the coil 16. At least a part of the suspended portion outside the coil 16 is opposed to the permanent magnet. The coil 16 has a hollow structure. The suspended portion extends in the axial direction of the coil 16. The suspended portion is partially located in the hole of the coil 16. In this way, the arrangement of the magnetic vibrator 25 makes full use of the space inside the coil 16, which is beneficial to the miniaturized design of the carrier-type exciter device.

In addition, the floating portion is located at the center of the coil 16. This makes the dangling portion more fully magnetized, stronger in magnetism, and the driving force of the carrier-type actuator device is greater.

In other examples, the coil 16 is located outside the suspended portion. In this arrangement, the magnetic vibrator 25 can also be magnetized.

Preferably, the coil 16 is spaced from the suspended portion to provide a vibration space for the vibration of the suspended portion. In this way, it is possible to extend the length of the suspended portion so that the amplitude of the carrier-type exciter device is larger.

In addition, the way of being spaced apart makes the heat dissipation effect of the coil 16 better.

In other examples, a multi-point support is formed between the coil 16 and the suspended portion. In this arrangement, the heat dissipation of the coil 16 is faster, and the long-term use effect of the carrier-type actuator device is improved.

In one example, as shown in Figs. 1-4, the magnetic vibrator has an L-shaped structure. The L-shaped structure includes a first side 21 and a second side 22 connected to each other. The end of the first side 21 is the fixed end 15. The fixed end 15 is clamped and fixed between the shell walls of the first shell 11 and the second shell 12. The coil 16 is sheathed outside the first side 21. The permanent magnet is opposed to the first side 21. The coil 16 is located between the permanent magnet and the fixed portion 17. The second side 22 protrudes outward from the coil 16 or the permanent magnet. The second side 22 is a connecting portion. The end of the second side 22 is connected to the load element, for example, to form a rigid connection or a flexible connection. The distance between the connecting portion of the magnetic-permeable oscillator 25 of the L-shaped structure and the load element is small, and the connection between the two becomes easy.

In addition, the magnetically permeable vibrator 25 of this structure is easy to process and manufacture, for example, one-time molding by stamping.

In other examples, as shown in FIG. 5, the magnetic transducer 25 has a sheet structure. The end of the sheet-like structure protrudes outward from the through hole 29 of the housing to form a connecting portion. The connecting part is connected to the load element through a rigid material or an elastic connecting piece. This arrangement can also transmit vibration.

In other examples, the permanent magnet is located between the fixed portion 17 and the coil 16. The magnetic transducer 25 passes through the coil. The connection portion is located outside the coil 16.

In one example, as shown in FIGS. 4 and 5, the permanent magnet includes a first magnet 13 and a second magnet 14 disposed oppositely. The magnetic induction intensity of the magnetic field formed by this arrangement is uniform, which makes the magnetic vibrator 25 to be evenly stressed when vibrating. For example, the first magnet 13 and the second magnet 14 are both bar magnets. The first magnet 13 and the second magnet 14 may be, but not limited to, ferrite magnets and neodymium iron boron magnets.

The polarities of the sides of the first magnet 13 and the second magnet 14 that are close to each other are opposite. In this way, the magnetic induction between the first magnet 13 and the second magnet 14 is stronger. The suspended portion is located between the first magnet 13 and the second magnet 14 and is spaced apart from the first magnet 13 and the second magnet 14. For example, the first magnet 13 and the second magnet 14 are provided symmetrically on the upper and lower sides of the suspended portion in the vibration direction. The upper surface of the suspended portion faces the N pole of the first magnet 13, and the lower surface faces the S pole of the second magnet 14. When the coil 16 is energized, the floating portion is magnetized to the N pole.

In this way, the suspended portion repels the first magnet 13 and attracts the second magnet 14. This causes the suspension to be subjected to the magnetic force of the two magnets, and the direction of the two forces is the same. The carrier-type exciter device has stronger driving force, larger amplitude and higher vibration sensitivity.

Of course, the number of permanent magnets is not limited to two, and more permanent magnets can be provided. For example, a plurality of permanent magnets are provided on the inner wall of the housing along the extending direction of the magnetic transducer 25. It may also be that multiple permanent magnets form a Helmhertz array to increase the magnetic properties.

Of course, the setting method of the multiple permanent magnets is not limited to this, and those skilled in the art may set it according to actual needs.

In one example, the entire second housing 12 has a sheet-like structure. A shielding sheet 20 is provided outside the second casing 12. The shielding sheet 20 is made of a magnetically conductive material, which can play the role of magnetic permeability, reduce the occurrence of magnetic leakage, make the magnetic field of the permanent magnet stronger, and the driving force of the carrier-type exciter device greater.

As shown in FIGS. 1-5, the second housing 12 has an extending portion extending from the side wall of the first housing 11, and an FPCB 28 is provided on the extending portion. The FPCB 28 is electrically connected to the coil 16. The external device supplies power to the coil 16 through the FPCB 28.

In one example, a magnetic fluid is filled between the suspended portion and the permanent magnet and/or between the suspended portion and the coil 16. For example, a gap 20 is formed between the suspended portion and the permanent magnet. The magnetic fluid is provided in the gap 20. The magnetic fluid is made up of nano-scale magnetic solid particles, base carrier liquid and surfactant, and is a stable colloidal liquid. Magnetic fluid does not exhibit magnetism at rest; when an external magnetic field is applied, the magnetic fluid is magnetized and exhibits magnetism. The magnetic fluid has viscosity and can generate damping, thereby making the vibration of the magnetic vibrator 25 more stable.

In addition, the magnetic fluid has magnetic permeability properties. In this way, the magnetic fluid is attracted to the area where the magnetic field strength of the suspended portion is high, and does not flow arbitrarily, and the stability is high.

According to another embodiment of the present disclosure, an electronic terminal is provided. The electronic terminal may be, but not limited to, a mobile phone, a tablet computer, a smart watch, a notebook computer, a game machine, an interphone, a headset, a hearing aid, etc. The electronic terminal includes the above-mentioned carrier-type actuator device. The carrier-type exciter device is used to provide physical vibration. For example, the carrier-type exciter device can be used as a screen sounding device. In this example, the load element is a liquid crystal screen 26.

It may also be used as a vibration device for touch vibration prompts of electronic terminals or vibration prompts under other application conditions. In this example, the load element is a counterweight 27; or used in a vibration therapy device.

The electronic terminal has the characteristics of large amplitude and good vibration effect.

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

A carrier-type exciter device, which includes an electromagnetic exciter and a load element, the electromagnetic exciter includes a housing, a magnetic vibrator, a coil, and a permanent magnet, a cavity is formed inside the housing, and the permanent magnet The coil and the magneto-vibrator are located inside the cavity, and the load element is located outside the cavity. The magneto-vibrator includes a fixed end and a suspended portion connected to each other, the fixed end is fixed at the On the casing, a part of the suspended portion is opposite to and spaced from the permanent magnet, the coil is sleeved outside the suspended portion, the suspended portion includes a connection portion, and the casing has a through hole, the A connecting portion protrudes from the through hole, the connecting portion is connected to the load element, the coil generates an alternating magnetic field in response to an alternating signal of an external circuit, and the magnetic vibrator is affected by the magnetic field For magnetization, the permanent magnet is configured to interact with the suspended portion to drive the magnetic vibrator to vibrate, which drives the load element to vibrate.
The carrier-type actuator device according to claim 1, wherein the connection portion is rigidly connected to the load element; or the connection portion is connected to the load element through an elastic connection.
The carrier-type actuator device according to claim 2, wherein the connecting portion is connected to the load element through an elastic connecting member, the elastic connecting member is at least one of a spring, an elastic piece, an elastic rubber member and an elastic silicone member Species.
The carrier-type exciter device according to claim 1, wherein the magnetic vibrator has an L-shaped structure, and the L-shaped structure includes a first side and a second side connected to each other, and an end of the first side is For the fixed end, the coil is sleeved outside the first side, the permanent magnet is opposite to the first side, the second side is the connecting portion, and the end of the second side is The load element is connected.
The carrier-type exciter device according to any one of claims 1 to 4, wherein between the coil and the magneto-vibrator and/or between the permanent magnet and the magneto-vibrator There is magnetic fluid.
The carrier-type actuator device according to any one of claims 1 to 4, wherein the housing includes a first housing and a second housing, and the fixed end is clamped and fixed to the first In the shell wall of the shell and the second shell.
The carrier-type exciter device according to any one of claims 1 to 4, wherein the load element is at least one of a diaphragm, a weight, and a plate for sound emission.
The carrier type actuator device according to any one of claims 1 to 4, wherein the load element is an LED screen, an LCD screen or an OLED screen.
The carrier-type exciter device according to any one of claims 1 to 4, wherein the permanent magnet includes a first magnet and a second magnet that are relatively disposed on both sides of the magnetic vibrator in the vibration direction .
The carrier-type exciter device according to any one of claims 1 to 4, wherein the permanent magnets are plural, and the plural permanent magnets form a Helmhertz array.