CN111384834A - Carrier type exciter device - Google Patents

Abstract

The invention discloses a carrier type exciter device. This carrier formula exciter device includes electromagnetic exciter and load element, electromagnetic exciter includes the casing, the magnetic conduction oscillator, coil and permanent magnet, the inside formation cavity of casing, the permanent magnet, coil and magnetic conduction oscillator are located the cavity, load element is located outside the cavity, the magnetic conduction oscillator includes interconnect's stiff end and free portion, the stiff end is fixed on the casing, partly and permanent magnet phase place of free portion are relative and looks interval, the coil cover is established outside the free portion, free portion includes connecting portion, the casing has the through-hole, connecting portion stretches out from the through-hole, connecting portion and load element are connected, the coil responds the alternating signal of external circuit, produce alternating magnetic field, the magnetic conduction oscillator is magnetized under the effect in magnetic field, the permanent magnet is configured to and free portion interact, in order to drive the magnetic conduction oscillator vibration, the magnetic conduction oscillator drives load element vibration.

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 exciters, classified according to the principle, including moving coil type, moving magnet type and moving iron type, and their movers are coil, magnet and magnetically conductive armature respectively; Mode.

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

The moving magnetic exciter can use the force of the energized wire, or the force between a plurality of permanent magnets, the permanent magnet and the magnetic conductive material to make it move. However, since the position of the moving magnet is not easy to fix, the unbalanced force caused by the nonlinear change of the magnetic field of the permanent magnet due to external action must always be considered, which is difficult to design, and is not conducive to optimal adjustment and subsequent maintenance.

The moving iron type exciter can use the force of the energized wire or the force between the permanent magnet and the magnetic conductive 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 motivating force and high stability.

Direct-drive exciter, the mover is directly connected with 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 movement of the load.

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

Therefore, it is necessary to provide a new technical solution to solve the above-mentioned 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 present 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 conductive vibrator, a coil and a permanent magnet, the interior of the housing forms a cavity, the permanent magnet, the coil and the magnetic conductive vibrator is located in the cavity, the load element is located outside the cavity, the magnetic conductive 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 opposite to and spaced apart from the permanent magnet, the coil is sleeved outside the suspended portion, the suspended portion includes a connecting portion, the casing has a through hole, and the connecting portion extends from the The through hole protrudes, the connection part is connected to the load element, the coil responds to the alternating signal of the external circuit to generate an alternating magnetic field, and the magnetic conductive vibrator is magnetized under the action of the magnetic field. The permanent magnet is configured to interact with the suspended portion to drive the magnetic conductive vibrator to vibrate, and the magnetic conductive vibrator drives 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 piece.

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

Optionally, the magnetic conductive vibrator has an L-shaped structure, the L-shaped structure includes a first side and a second side that are connected to each other, the end of the first side is the fixed end, and the coil is sleeved on the 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 arranged between the coil and the magnetic conductive vibrator and/or between the permanent magnet and the magnetic conductive vibrator.

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

Optionally, the load element is at least one of a diaphragm, a counterweight, 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 disposed on both sides of the magnetic conductive vibrator along the vibration direction.

Optionally, there are multiple permanent magnets, and 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 apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

1 is an exploded view of a portion of an electromagnetic exciter according to one embodiment of the present disclosure.

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

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

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

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

Description of reference numbers:

11: first shell; 12; second shell; 13: first magnet; 14: second magnet; 15: fixed end; 16: coil; 17: fixed part; 19: shield sheet; 20: gap; 21: first One side; 22: Second side; 25: Magnetic vibrator; 26: LCD screen; 27: Counterweight; 28: FPCB; 29: Through hole; 31: Spring; 32: Diaphragm; 33: DOME.

Detailed ways

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

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

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

In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

According to one embodiment of the present disclosure, a carrier-based exciter device is provided. As shown in Figures 1 and 2, the carrier-type exciter device is an electromagnetic exciter and a load element. The electromagnetic exciter includes a housing, a magnetic conductive vibrator 25, a coil 16 and a permanent magnet. A part of the casing serves as the fixing part 17 . The interior of the housing forms a cavity. The magnetic conductive vibrator 25, the coil 16 and the permanent magnet are arranged 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 housings 11 , 12 . For example, the entirety of the housing is square. The first housing 11 forms a cavity with an open end. The second housing 12 is closed on the open end. The material of the housing is metal, plastic, ceramic, glass, etc.

For example, the first housing 11 and the second housing 12 are made of magnetically conductive material. The magnetic conductive material can be but not limited to ferrite material, tungsten steel or SPCC, etc. All the above materials have good magnetic conductivity. Due to the thickness of the permanent magnet is usually small. The magnetization direction is along the thickness direction. In this way, the two magnetic poles are likely to form a magnetic short circuit. The permanent magnets are arranged on the first housing 11 or the second housing 12 . Since the two shells 11 and 12 have a magnetic conductivity effect, the occurrence of a magnetic short circuit can be effectively avoided, and the magnetic properties of the permanent magnets can be significantly improved.

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

The fixed end 15 is fixed to the fixed portion 17 . The fixed part 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 fixed end 15 may be fixed on the shell wall of the casing. The part of the shell wall for fixing the fixing end 15 is the fixing part 17 . The suspended portion 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 snapping. In this way, the magnetic permeable vibrator 25 can be firmly fixed.

Alternatively, the fixed end 15 is relatively fixed to the housing through other components. For example, the fixed end 15 is clamped and fixed in the coil 16 . The coil 16 is fixed to the case by an adhesive or the like.

The suspended portion is opposite to and spaced apart from the permanent magnet to form a vibration space. The coil 16 is configured for magnetizing the overhang. The coil 16 is sleeved outside the suspended portion.

The housing has a through hole 29 . For example, a through hole 29 is provided on the side of the housing opposite to the fixing portion 17 . The connecting portion protrudes from the through hole 29 . The load element is located on the outside of 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 the alternating signal of the external circuit, and the magnetic conductive oscillator 25 is magnetized under the action of the magnetic field. The permanent magnet is configured to interact with the suspended portion to drive the magnetic conductive vibrator 25 to vibrate, and the magnetic conductive vibrator 25 drives the load element to vibrate.

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

in,

Among them, 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 vacuum permeability, and S is the area. If the magnetic field is assumed to be uniform in the force region of the magnetic vibrator, 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 conductive vibrator due to 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 intensity is provided, or a plurality of permanent magnets are used together to increase the magnetic induction intensity, for example, a Halbeck array is formed by a plurality of permanent magnets, so as to improve the magnetic induction intensity.

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

The magnetic permeable vibrator 25 of the cantilever structure is light in mass, has small high-frequency attenuation, and can provide stable high-frequency vibration. In addition, the magnetic conductive oscillator 25 has a larger amplitude at high frequencies and a faster response. In addition, the structure of the cantilever structure is stable, and the force of the magnetic conductive vibrator is uniform during vibration.

In addition, the magnetic conductive vibrator 25 of the cantilever structure will exhibit different vibration modes under the action of excitation at different frequencies. The vibration modes at different frequencies will increase the vibration amplitude of the magnetic conductive vibrator 25 in the frequency range, thereby widening the frequency range of the carrier-type exciter device.

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

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

As shown in Figure 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 a shell wall PCB, FPCB, etc. of the electronic terminal. For example, the material of the shell wall is metal, ceramic, plastic, glass, and the like.

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

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

It is also possible that the connecting portion is connected to the load element by means of a rigid material. Rigid materials include metal, glass, ceramic, wood, etc.

In one example, as shown in FIG. 5 , the connection portion is connected to the load element through an elastic connection member. 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 can change the vibration mode of the magnetic conductive 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 is not limited to, at least one of a spring 31, an elastic sheet, an elastic rubber member and an elastic silicone member. All of the above materials are capable of elastic deformation.

In one example, as shown in FIGS. 2-5 , the overhang passes through the coil 16 and exits from one end of the coil 16 . At least a part of the portion of the dangling portion outside the coil 16 is opposed to the permanent magnet. The coil 16 has a hollow structure. The floating portion extends in the axial direction of the coil 16 . Part of the overhang is located in the hole of the coil 16 . In this way, the arrangement of the magnetic conductive 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 enables the suspension to be more fully magnetized, the magnetism is stronger, and the driving force of the carrier-type exciter device is greater.

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

Preferably, the coil 16 is spaced from the suspension to provide a vibration space for the vibration of the suspension. In this way, the length of the overhang can be extended, making the amplitude of the carrier-type exciter device larger.

In addition, the spaced arrangement makes the heat dissipation effect of the coils 16 better.

In other examples, multiple points of support are formed between the coil 16 and the overhang. With this arrangement, the heat dissipation of the coil 16 is more rapid, and the long-term use effect of the carrier-type exciter device is improved.

In one example, as shown in Figures 1-4, the magnetic permeator has an L-shaped structure. The L-shaped structure includes a first side 21 and a second side 22 that are 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 sleeved outside the first side 21 . The permanent magnet is opposite 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 ends of the second side 22 are connected to the load element, eg forming a rigid connection or a flexible connection. The distance between the connecting portion of the magnetic permeable vibrator 25 of the L-shaped structure and the load element is small, and the connection between the two becomes easy.

In addition, the magnetic conductive vibrator 25 of this structure is easy to process and manufacture, for example, it can be formed at one time by punching.

In other examples, as shown in FIG. 5 , the magnetic conductive vibrator 25 is a sheet-like structure. The ends of the sheet-like structures protrude outward from the through holes 29 of the housing to form the connection portion. The connection part is connected with the load element by rigid material or elastic connection. This setup also transmits vibrations.

In other examples, the permanent magnet is located between the fixed portion 17 and the coil 16 . The magnetic vibrator 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 which are oppositely arranged. The magnetic induction intensity of the magnetic field formed by this arrangement is uniform, which makes the magnetic conductive vibrator 25 receive uniform force when vibrating. For example, both the first magnet 13 and the second magnet 14 are bar magnets. The first magnet 13 and the second magnet 14 may be, but are not limited to, ferrite magnets and NdFeB magnets.

The polarities of the mutually adjacent sides of the first magnet 13 and the second magnet 14 are opposite to each other. In this way, the magnetic flux density 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 symmetrically arranged 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 directions of the two forces are 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 than one can also be provided. For example, a plurality of permanent magnets are arranged on the inner wall of the housing along the extending direction of the magnetically conductive vibrator 25 . It is also possible that a plurality of permanent magnets form a Helmhertz array to increase the magnetic properties.

Of course, the arrangement of the plurality of permanent magnets is not limited to this, and those skilled in the art can perform the arrangement according to actual needs.

In one example, the entire second housing 12 is a sheet-like structure. A shielding sheet 20 is provided on the outer side of the second housing 12 . The shielding sheet 20 is made of a magnetically conductive material, which can play a role of magnetic conductivity and reduce the occurrence of magnetic leakage, so that the magnetic field of the permanent magnet is stronger, and the driving force of the carrier-type exciter device is larger.

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

In one example, magnetic fluid is filled between the overhang and the permanent magnet and/or between the overhang and the coil 16 . For example, a gap 20 is formed between the suspended portion and the permanent magnet. Magnetic fluid is provided in the gap 20 . Magnetic liquid is a stable colloidal liquid, which is made up of nano-scale magnetic solid particles, base carrier liquid and surfactant. The ferrofluid does not show magnetism in static state; when an external magnetic field acts, the ferrofluid is magnetized and shows magnetism. The magnetic fluid is viscous and can generate damping, thereby making the vibration of the magnetic vibrator 25 more stable.

In addition, ferrofluids have magnetic permeability properties. In this way, the magnetic liquid will be adsorbed in the area of the suspended portion with high magnetic field strength, and will not flow arbitrarily, and the stability will be high.

According to another embodiment of the present disclosure, an electronic terminal is provided. The electronic terminal may be, but is not limited to, a mobile phone, a tablet computer, a smart watch, a notebook computer, a game console, a walkie-talkie, an earphone, a hearing aid, and the like. The electronic terminal includes the carrier-type exciter device described above. Carrier-based exciter devices are used to provide physical vibrations. 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 can 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 for 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 by way of examples, those skilled in the art should understand that the above examples are provided for illustration only and not for the purpose of limiting the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. A carrier-type exciter device, comprising an electromagnetic exciter and a load element, the electromagnetic exciter comprising a housing, a magnetic vibrator, a coil and a permanent magnet, the interior of the housing forms a cavity, the The permanent magnet, the coil and the magnetic conductive vibrator are located in the cavity, the load element is located outside the cavity, the magnetic conductive vibrator includes a fixed end and a suspended portion connected to each other, and the fixed end is fixed on the cavity. 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 connecting portion, and the casing has a through hole, The connection part protrudes from the through hole, the connection part is connected with the load element, the coil responds to the alternating signal of the external circuit, and generates an alternating magnetic field, and the magnetic conductive vibrator acts on the magnetic field The permanent magnet is configured to interact with the suspended portion to drive the magnetic conductive vibrator to vibrate, and the magnetic conductive vibrator drives the load element to vibrate. 2. The carrier-type exciter device according to claim 1, wherein the connecting portion is rigidly connected to the load element; or the connecting portion is connected to the load element through an elastic connection. 3. The carrier-type exciter device according to claim 2, wherein the connecting part is connected to the load element through an elastic connecting piece, and the elastic connecting piece is one of a spring, an elastic sheet, an elastic rubber piece and an elastic silicone piece. at least one. 4 . The carrier-type exciter device according to claim 1 , wherein the magnetic conducting element is in an L-shaped structure, and the L-shaped structure comprises a first side and a second side connected to each other, and the first side has an L-shaped structure. 5 . The end is 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 connected to the load element. 5. The carrier type exciter device according to any one of claims 1-4, wherein between the coil and the magnetic conductive oscillator and/or between the permanent magnet and the magnetic conductive oscillator Magnetic fluid is arranged between. 6. The carrier type exciter device according to any one of claims 1-4, wherein the housing comprises a first housing and a second housing, and the fixed end is clamped and fixed on the in the shell walls of the first shell and the second shell. 7. The carrier-based exciter device of any one of claims 1-4, wherein the load element is at least one of a diaphragm, a counterweight, and a plate for sound generation. 8. The carrier type exciter device according to any one of claims 1-4, wherein the load element is an LED screen, an LCD screen or an OLED screen. 9. The carrier-type exciter device according to any one of claims 1-4, wherein the permanent magnet comprises a first magnet and a second magnet which are arranged oppositely on both sides of the magnetic conductive vibrator along the vibration direction. Two magnets. 10. The carrier-type exciter device according to any one of claims 1-4, wherein the permanent magnets are in a plurality, and the plurality of the permanent magnets form a Helmhertz array.

Images