Carrier type exciter device

Abstract

The invention discloses a carrier-type exciter device. The carrier-type exciter device comprises an electromagnetic exciter and a load element. The electromagnetic exciter comprises a shell, a magnetic vibrator, a coil and a permanent magnet. The shell forms a cavity inside. The permanent magnet, the coil and the magnetic vibrator are located in the cavity. The load element is located outside the cavity. The magnetic vibrator comprises a fixed end and a suspended part connected to each other. The fixed end is fixed to the shell. A part of the suspended part is opposite to and spaced from the permanent magnet. The coil is sleeved outside the suspended part. The suspended part comprises a connecting part. The shell has a through hole. The connecting part extends from the through hole. The connecting part is connected to the load element. The coil responds to the alternating signal of the external circuit to generate an alternating magnetic field. The magnetic vibrator is magnetized under the action of the magnetic field. The permanent magnet is configured to interact with the suspended part to drive the magnetic vibrator to vibrate. The magnetic vibrator drives the load element to vibrate.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic vibration technology, and more specifically, to a carrier-type exciter device. Background Art

[0002] There are many types of electromagnetic exciters. According to the principle, they include moving coil type, moving magnet type and moving iron type, and their movers are coils, magnets and magnetic armatures respectively; according to the transmission mode, they include direct drive type and resonant type.

[0003] The moving coil actuator, 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 actuator is simple and intuitive, which is convenient for optimization and 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.

[0004] Moving magnet actuators can use the force of energized wires or the force between multiple permanent magnets or between permanent magnets and magnetic materials to make them move. However, since the position of the moving magnets is not easy to fix, the nonlinear changes in the magnetic field of the permanent magnets caused by external forces must always be considered, resulting in unbalanced forces. This makes the design more difficult and is not conducive to optimization, adjustment, and subsequent maintenance.

[0005] Moving iron type actuators can use the force of the current-carrying wire or the force between the permanent magnet and the magnetic rotor to make it move, and the movement will not cause a large change in the magnetic field. It is easy to design products with large excitation force and high stability.

[0006] In a direct-drive exciter, the mover is directly connected to the load, and the load is driven by the mover. The force transmission is relatively direct, and the load movement is mainly driven by the excitation force.

[0007] In a resonant exciter, the mover is not connected to the load, and the load is driven by the mover's own mass. The force transmission depends on the mover's mass, and the excitation force is an internal force that is only used to excite the mover.

[0008] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0009] An object of the present invention is to provide a new technical solution for a carrier type exciter device.

[0010] According to a first aspect of the present invention, a carrier-type exciter device is provided. The carrier-type exciter device comprises an electromagnetic exciter and a load element, the electromagnetic exciter comprises a shell, a magnetic vibrator, a coil and a permanent magnet, the shell forms a cavity inside, the permanent magnet, the coil and the magnetic vibrator are located in the cavity, the load element is located outside the cavity, the magnetic vibrator comprises a fixed end and a suspended portion connected to each other, the fixed end is fixed to the shell, 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 comprises a connecting portion, the shell has a through hole, the connecting portion extends from the through hole, the connecting portion is connected to the load element, the coil responds to an alternating signal of an external circuit, generates an alternating magnetic field, the magnetic 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 vibrator to vibrate, and the magnetic vibrator drives the load element to vibrate.

[0011] Optionally, the connecting portion is rigidly connected to the load element; or the connecting portion is connected to the load element via an elastic connecting member.

[0012] Optionally, the connecting portion is connected to the load element via an elastic connecting member, and the elastic connecting member is at least one of a spring, a spring, an elastic rubber member and an elastic silicone member.

[0013] 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, the coil is arranged outside the first side, the permanent magnet is opposite to the first side, the second side is the connecting part, and the end of the second side is connected to the load element.

[0014] Optionally, magnetic fluid is provided between the coil and the magnetically conductive vibrator and / or between the permanent magnet and the magnetically conductive vibrator.

[0015] 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.

[0016] Optionally, the load element is at least one of a diaphragm, a counterweight, and a plate for generating sound.

[0017] Optionally, the load element is an LED screen, an LCD screen or an OLED screen.

[0018] Optionally, the permanent magnet includes a first magnet and a second magnet which are arranged on both sides of the magnetic vibrator relatively along the vibration direction.

[0019] Optionally, there are multiple permanent magnets, and the multiple permanent magnets form a Halbach array.

[0020] According to one embodiment of the present disclosure, the carrier-type exciter device has the characteristics of small size, large amplitude and good vibration effect.

[0021] Further 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 attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0023] Figure 1 is an exploded view of a portion of an electromagnetic exciter according to one embodiment of the present disclosure.

[0024] Figure 2 is a cross-sectional view of a carrier-type actuator device according to an embodiment of the present disclosure.

[0025] Figure 3 is a cross-sectional view of a second carrier-type exciter device according to an embodiment of the present disclosure.

[0026] Figure 4 is a cross-sectional view of a third carrier-type exciter device according to an embodiment of the present disclosure.

[0027] Figure 5 is a cross-sectional view of a fourth carrier-type exciter device according to an embodiment of the present disclosure.

[0028] Description of reference numerals:

[0029] 11: first shell; 12: second shell; 13: first magnet; 14: second magnet; 15: fixed end; 16: coil; 17: fixed part; 19: shielding plate; 20: gap; 21: first side; 22: second side; 25: magnetic vibrator; 26: LCD screen; 27: counterweight; 28: FPCB; 29: through hole; 31: spring; 32: diaphragm; 33: DOME. DETAILED DESCRIPTION

[0030] 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, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0031] 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.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0033] 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 embodiments may have different values.

[0034] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] According to one embodiment of the present disclosure, a carrier-type actuator device is provided. Figure 1 , 2 As shown, the carrier-type exciter device comprises an electromagnetic exciter and a load element. The electromagnetic exciter comprises a shell, a magnetic vibrator 25, a coil 16 and a permanent magnet. A portion of the shell serves as a fixing portion 17. A cavity is formed inside the shell. The magnetic vibrator 25, the coil 16 and the permanent magnet are arranged in the cavity. For example, the shell comprises a first shell 11 and a second shell 12 that are snapped together. A cavity is formed inside the two shells 11, 12. For example, the shell is square as a whole. The first shell 11 forms a cavity with an open end. The second shell 12 covers the open end. The shell is made of metal, plastic, ceramic, glass, etc.

[0036] For example, the first shell 11 and the second shell 12 are made of magnetic conductive materials. The magnetic conductive materials can be, but are not limited to, ferrite materials, tungsten steel or SPCC, etc. The above materials all have good magnetic conductive effects. Since 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 prone to form a magnetic short circuit. The permanent magnet is set on the first shell 11 or the second shell 12. Since the two shells 11 and 12 have a magnetic conductive effect, the occurrence of magnetic short circuit can be effectively avoided, and the magnetism of the permanent magnet can be significantly improved.

[0037] The magnetic vibrator 25 includes a fixed end 15 and a suspended portion connected to each other. The magnetic vibrator 25 is made of a magnetic material. The magnetic material is as described above. For example, the magnetic vibrator 25 is a strip-shaped sheet structure or other structures.

[0038] The fixed end 15 is fixed to the fixed portion 17. The fixed 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 fixed end 15 may be fixed to the shell wall of the shell. The part of the shell wall used to fix the fixed end 15 is the fixed portion 17. The suspended portion is suspended in the cavity to form a cantilever beam structure. For example, Figure 2-5As shown, the fixed end 15 is fixed between the first housing 11 and the second housing 12 by bonding, welding or clamping, so that the magnetic vibrator 25 can be firmly fixed.

[0039] 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 housing through an adhesive or the like.

[0040] The suspended part is opposite to the permanent magnet and is spaced apart from each other to form a vibration space. The coil 16 is configured to magnetize the suspended part. The coil 16 is sleeved outside the suspended part.

[0041] The housing has a through hole 29. For example, the through hole 29 is provided on a side of the housing opposite to the fixing portion 17. The connecting portion extends from the through hole 29. The load element is located outside the housing. The connecting portion is directly or indirectly connected to the load element.

[0042] The coil 16 generates an alternating magnetic field in response to an alternating signal from an external circuit, and the magnetic vibrator 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 vibrator 25 to vibrate, and the magnetic vibrator 25 drives the load element to vibrate.

[0043] The interaction force between the magnetic vibrator 25 and the permanent magnet, i.e. the driving force, can be calculated using the following formula:

[0044]

[0045] in,

[0046] Among them, M is the medium magnetization intensity, B is the magnetic induction intensity, n is the surface normal vector, μ r is the relative magnetic permeability of the magnetic medium, μ0 is the magnetic permeability of the vacuum, and S is the area. If it is assumed that the magnetic field is uniform in the force area of ​​the magnetic oscillator, the above formula can also be expressed in the following simplified form:

[0047]

[0048] 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 due to the influence of the application environment, and increasing the magnetic induction intensity of the permanent magnet can effectively increase the driving force. For example, the magnetic induction intensity can be increased by setting a permanent magnet with a higher magnetic induction intensity, or by using multiple permanent magnets together, for example, multiple permanent magnets form a Halbach array to increase the magnetic induction intensity.

[0049] In the embodiment of the present invention, the magnetic vibrator 25 forms a cantilever structure. The suspended part is magnetized by the energized coil 16, so that it has magnetism. The polarity of the permanent magnet is the same as or opposite to the polarity of the suspended part, thereby forming a repulsive force or an attractive force. When the coil 16 is passed with an alternating current, the magnetic vibrator 25 generates reciprocating vibrations, thereby driving the load element to vibrate. The load exciter has a high magnetic field utilization rate and a large driving force. The magnetic vibrator 25 has a small size, a large amplitude, and a good vibration effect.

[0050] The cantilever structure of the magnetic vibrator 25 is light in weight, has low high-frequency attenuation, and can provide stable high-frequency vibration. The magnetic vibrator 25 has a larger amplitude at high frequencies and responds more quickly. In addition, the cantilever structure is stable, and the magnetic vibrator is subjected to uniform force during vibration.

[0051] In addition, the cantilever structured magnetic vibrator 25 will present different vibration modes under the action of different frequency excitations. The vibration modes at different frequencies will increase the vibration amplitude of the magnetic vibrator 25 within the frequency range, thereby widening the frequency band range of the carrier-type exciter device.

[0052] For example, the load element is at least one of the diaphragm 32, the weight block 27, and a plate for generating sound. Figure 2 As shown, when the load element is a diaphragm 32, the carrier-type exciter device is used for vibrating and generating sound. The diaphragm 32 includes a central portion, an edge portion, and a folded ring portion located between the edge portion and the central portion. A DOME 33 is fixed to the central portion. The end of the connecting portion is fixedly connected to the central portion by an adhesive.

[0053] like Figure 4 As shown, when the load element is a counterweight 27, the carrier-type exciter device is used to provide electromagnetic vibration, such as a vibration motor. The counterweight 27 is made of metal, plastic, ceramic, glass, etc.

[0054] like Figure 3 As shown, when the load element is a plate for sound generation, the carrier-type exciter device is used for vibration and sound generation. The plate can be a shell wall PCB, FPCB, etc. of an electronic terminal. For example, the shell wall is made of metal, ceramic, plastic, glass, etc.

[0055] Preferably, the load element is a liquid crystal screen 26. For example, an LED screen, an LCD screen, an OLED screen, etc. The electromagnetic exciter drives the liquid crystal screen 26 to vibrate and make sounds.

[0056] In an example, Figure 2-4 As shown, the connection part 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.

[0057] Alternatively, the connection portion is connected to the load element through a rigid material, such as metal, glass, ceramic, wood, etc.

[0058] In an example, Figure 5 As shown, the connection part is connected to the load element through an elastic connection part. The elastic connection part can be elastically deformed and has low stiffness. A flexible connection is formed between the connection part and the load element. The flexible connection method can change the vibration mode of the magnetic vibrator 25, reduce the resonant frequency of the carrier-type exciter device, and improve the low-frequency effect of the carrier-type exciter device.

[0059] For example, the elastic connecting member may be, but is not limited to, at least one of a spring 31, a spring sheet, an elastic rubber member, and an elastic silicone member. All of the above materials can undergo elastic deformation.

[0060] In an example, Figure 2-5 As shown, the suspended portion passes through the coil 16 and comes out from one end of the coil 16. At least a part of the suspended portion located outside the coil 16 is opposite to the permanent magnet. The coil 16 has a hollow structure. The suspended portion extends along the axial direction of the coil 16. A part of the suspended portion is 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 conducive to the miniaturized design of the carrier-type exciter device.

[0061] In addition, the suspended portion is located at the center of the coil 16. This allows the suspended portion to be more fully magnetized, the magnetism to be stronger, and the driving force of the carrier-type exciter device to be greater.

[0062] In other examples, the coil 16 is located outside the suspended portion. In this arrangement, the magnetic vibrator 25 can also be magnetized.

[0063] Preferably, the coil 16 is spaced apart from the suspended portion to provide a vibration space for the vibration of the suspended portion. In this way, the length of the suspended portion can be extended, so that the amplitude of the carrier-type exciter device is larger.

[0064] In addition, the spacing arrangement makes the heat dissipation effect of the coil 16 better.

[0065] In other examples, multiple points of support are formed between the coil 16 and the suspended portion. In this arrangement, the heat dissipation of the coil 16 is faster, thereby improving the long-term use effect of the carrier-type exciter device.

[0066] In an example, Figure 1-4As shown, the magnetic vibrator is in 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 a 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 part 17. The second side 22 protrudes outward from the coil 16 or the permanent magnet. The second side 22 is a connecting part. 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 part of the L-shaped magnetic vibrator 25 and the load element is small, and the connection between the two becomes easy.

[0067] In addition, the magnetic vibrator 25 of this structure is easy to process and manufacture, for example, it can be formed in one step by stamping.

[0068] In other examples, such as Figure 5 As shown, the magnetic vibrator 25 is a sheet structure. The end of the sheet structure extends outward from the through hole 29 of the shell to form a connecting part. The connecting part is connected to the load element through a rigid material or an elastic connecting piece. This arrangement can also transmit vibration.

[0069] In other examples, the permanent magnet is located between the fixing portion 17 and the coil 16 , the magnetic vibrator 25 passes through the coil, and the connecting portion is located outside the coil 16 .

[0070] In an example, Figure 4 , 5 As shown, the permanent magnet includes a first magnet 13 and a second magnet 14 arranged opposite to each other. The magnetic induction intensity of the magnetic field formed by this arrangement is uniform, so that the magnetic vibrator 25 is uniformly 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 can be, but are not limited to, ferrite magnets and neodymium iron boron magnets.

[0071] The polarities of the first magnet 13 and the second magnet 14 on the side close to each other are opposite. In this way, the magnetic induction intensity 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 along the vibration direction. The upper surface of the suspended portion is opposite to the N pole of the first magnet 13, and the lower surface is opposite to the S pole of the second magnet 14. When the coil 16 is energized, the suspended portion is magnetized to the N pole.

[0072] In this way, the suspended part repels the first magnet 13 and attracts the second magnet 14. This causes the suspended part to be acted upon by the magnetic forces of the two magnets, and the two forces are in the same direction. The carrier-type exciter device has a stronger driving force, a larger amplitude, and a higher vibration sensitivity.

[0073] Of course, the number of permanent magnets is not limited to two, and more permanent magnets may be provided. For example, multiple permanent magnets are provided on the inner wall of the housing along the extension direction of the magnetic vibrator 25. Alternatively, multiple permanent magnets form a Halbach array to increase magnetism.

[0074] Of course, the arrangement of the multiple permanent magnets is not limited thereto, and those skilled in the art can arrange it according to actual needs.

[0075] In one example, the second housing 12 is in a sheet-like structure. A shielding sheet 20 is provided on the outside of the second housing 12. The shielding sheet 20 is made of a magnetic conductive material, which can play a role in magnetic conductivity, reduce the occurrence of magnetic leakage, make the magnetic field of the permanent magnet stronger, and make the driving force of the carrier-type exciter device greater.

[0076] like Figure 1-5 As shown, the second housing 12 has a protruding portion extending out of the side wall of the first housing 11, and a FPCB 28 is disposed on the protruding portion. The FPCB 28 is electrically connected to the coil 16. The external device supplies power to the coil 16 through the FPCB 28.

[0077] 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 disposed in the gap 20. The magnetic fluid is a mixture of nano-scale magnetic solid particles, a base carrier liquid, and a surfactant, and is a stable colloidal liquid. The magnetic fluid does not exhibit magnetism when static; 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.

[0078] In addition, the magnetic fluid has a magnetic conductivity property. Thus, the magnetic fluid will be adsorbed in the area with high magnetic field strength of the suspended part, and will not flow arbitrarily, and has high stability.

[0079] 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 laptop computer, a game console, a walkie-talkie, a headset, a hearing aid, etc. The electronic terminal includes the above-mentioned carrier-type exciter 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 sound device, in which the load element is a liquid crystal screen 26.

[0080] 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 block 27; or it is used for a vibration therapy device.

[0081] The electronic terminal has the characteristics of large amplitude and good vibration effect.

[0082] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A carrier-type exciter device, wherein: The invention comprises an electromagnetic exciter and a load element, wherein the electromagnetic exciter comprises a shell, a magnetic vibrator, a coil and a permanent magnet, wherein a cavity is formed inside the shell, wherein the permanent magnet, the coil and the magnetic vibrator are located in the cavity, and wherein the load element is located outside the cavity, wherein the magnetic vibrator comprises a fixed end and a suspended portion connected to each other, wherein the fixed end is fixed to the shell, wherein a part of the suspended portion is opposite to and spaced from the permanent magnet, wherein the coil is sleeved outside the suspended portion, wherein the suspended portion comprises a connecting portion, wherein the shell has a through hole, wherein the connecting portion extends from the through hole, and wherein the connecting portion is connected to the load element, wherein the coil responds to an alternating signal of an external circuit to generate an alternating magnetic field, wherein the magnetic vibrator is magnetized under the action of the magnetic field, wherein the permanent magnet is configured to interact with the suspended portion to drive the magnetic vibrator to vibrate, and wherein the magnetic vibrator drives the load element to vibrate; The shell includes a first shell and a second shell, the fixed end is clamped and fixed in the shell walls of the first shell and the second shell, a part of the shell serves as a fixed part, and the fixed end is fixed to the fixed part.

2. The carrier-type actuator 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 via an elastic connecting member.

3. The carrier-type actuator device according to claim 2, wherein: The connecting portion is connected to the load element via an elastic connecting piece, and the elastic connecting piece is at least one of a spring, a spring, an elastic rubber piece, and an elastic silicone piece.

4. The carrier-type actuator device according to claim 1, wherein: The magnetic vibrator is in 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, the coil is arranged outside the first side, the permanent magnet is opposite to the first side, the second side is the connecting part, and the end of the second side is connected to the load element.

5. The carrier-type exciter device according to any one of claims 1 to 4, wherein: Magnetic fluid is arranged between the coil and the magnetically conductive vibrator and / or between the permanent magnet and the magnetically conductive vibrator.

6. 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 block, and a plate for generating sound.

7. The carrier-type exciter 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.

8. 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 which are arranged oppositely on both sides of the magnetic vibrator along the vibration direction.

9. The carrier-type exciter device according to any one of claims 1 to 4, wherein: There are a plurality of permanent magnets, and the plurality of permanent magnets form a Halbach array.

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