CN115334422B - Exciter and electronic equipment - Google Patents
Exciter and electronic equipment Download PDFInfo
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- CN115334422B CN115334422B CN202211110316.7A CN202211110316A CN115334422B CN 115334422 B CN115334422 B CN 115334422B CN 202211110316 A CN202211110316 A CN 202211110316A CN 115334422 B CN115334422 B CN 115334422B
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- exciter
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- 230000000670 limiting effect Effects 0.000 claims abstract description 257
- 239000000919 ceramic Substances 0.000 claims abstract description 60
- 229910010293 ceramic material Inorganic materials 0.000 claims description 9
- 239000013013 elastic material Substances 0.000 claims description 7
- 239000007769 metal material Substances 0.000 claims description 6
- 239000002861 polymer material Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 5
- 229910002113 barium titanate Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims 1
- 230000005284 excitation Effects 0.000 abstract description 14
- 230000000694 effects Effects 0.000 description 9
- 230000000149 penetrating effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000013585 weight reducing agent Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000026683 transduction Effects 0.000 description 2
- 238000010361 transduction Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229920005560 fluorosilicone rubber Polymers 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Transducers For Ultrasonic Waves (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
The application discloses an exciter and electronic equipment, wherein the exciter comprises a stator assembly, an elastic piece, an oscillator assembly, a limiting piece and a piezoelectric ceramic plate, wherein the stator assembly is provided with a supporting part, the elastic piece is connected to the supporting part, the oscillator assembly is suspended on the supporting part through the elastic piece, an acoustic cavity is formed by enclosing the oscillator assembly, the elastic piece and the stator assembly, the oscillator assembly is provided with a limiting hole communicated with the acoustic cavity, a first end of the limiting piece is connected with the stator assembly, a first end of the limiting piece penetrates through the limiting hole to extend out of the acoustic cavity, the limiting piece is spaced from the wall of the limiting hole, and the piezoelectric ceramic plate is arranged outside the acoustic cavity and is connected with a second end of the limiting piece. The exciter has high reliability and good excitation performance, and improves the sounding performance of the electronic equipment when being applied to the electronic equipment.
Description
Technical Field
The invention relates to the technical field of electroacoustic conversion, in particular to an exciter and electronic equipment using the same.
Background
In order to realize the conversion from an electric signal to an acoustic signal of an electronic device, a common transduction device comprises a moving coil type loudspeaker, a moving iron type loudspeaker, a piezoelectric loudspeaker, a capacitive loudspeaker and the like, and the principle is that the electric signal is converted into mechanical vibration so as to push air to sound. The panel sound production is to excite the hard panel to generate various orders of resonance modes, and the panel realizes sound radiation in a form of nearly random vibration. For electronic devices, the planar structure of the electronic device, such as a screen, a shell and the like, provides realizable conditions for the sounding mode. To excite the resonant modes of the panel, a means of providing excitation is necessary.
In the related art, the excitation device generally cannot provide stable excitation for the flat plate, and lacks positioning in the excitation process, and when falling or collision occurs, friction is generated between all the components, so that the vibration effect is affected, and the sounding performance of the electronic equipment is further affected.
Disclosure of Invention
The invention mainly aims to provide the exciter with high reliability and good excitation performance, and the exciter is applied to electronic equipment and can improve the sounding performance of the electronic equipment.
To achieve the above object, the present invention proposes an actuator comprising:
The stator assembly is provided with a supporting part;
The elastic piece is connected to the supporting part;
The vibrator assembly is hung on the supporting part through the elastic piece, an acoustic cavity is formed by enclosing the vibrator assembly, the elastic piece and the stator assembly, and the vibrator assembly is provided with a limiting hole communicated with the acoustic cavity;
The first end of the limiting piece is connected with the stator assembly, the second end of the limiting piece penetrates through the limiting hole to extend out of the acoustic cavity, and the limiting piece is spaced from the wall of the limiting hole; and
The piezoelectric ceramic plate is arranged outside the acoustic cavity and connected to the second end of the limiting piece.
In an embodiment, the piezoelectric ceramic plate is provided with a mounting hole, and the second end of the limiting piece is arranged in the mounting hole in a penetrating mode.
In an embodiment, the outer wall of the limiting piece is concavely provided with a limiting groove corresponding to the piezoelectric ceramic plate, and the hole wall of the mounting hole is accommodated in and limited in the limiting groove.
In one embodiment, the mounting hole is located in a central region of the piezoelectric ceramic plate;
And/or the projection of the limiting hole on the stator assembly is positioned in the central area of the projection of the piezoelectric ceramic plate on the stator assembly.
In an embodiment, the piezoelectric ceramic plate is made of a piezoelectric ceramic material, and the piezoelectric ceramic material comprises one of PZT, lead metaniobate, pbTiO 3、BaTiO3, and BNT;
And/or the thickness of the piezoelectric ceramic plate is 0.1 mm-0.5 mm.
In an embodiment, a limiting boss is arranged at one end of the limiting piece, which is far away from the stator assembly, and the piezoelectric ceramic plate is connected to the outer wall of the limiting boss;
The vibrator assembly is provided with a limiting baffle corresponding to the limiting boss, and the limiting baffle extends towards the inside of the limiting hole and is positioned between the limiting boss and the stator assembly; and/or the projection of the limiting boss and the limiting baffle in the vibration direction of the vibrator assembly is at least partially overlapped.
In one embodiment, the limiting member has two major axis sides and two minor axis sides connected end to end; the limiting bosses are convexly arranged on the two long shaft sides; or, the limiting boss is convexly arranged on the two short shaft edges; or, the limiting boss is convexly arranged on the long axis side and the short axis side and is arranged around the periphery of the limiting piece;
or, the limiting piece is cylindrical, and the limiting boss is convexly arranged on the periphery of the limiting piece and surrounds the periphery of the limiting piece.
In an embodiment, a side of the vibrator assembly facing the acoustic cavity is provided with a magnetic gap, and the stator assembly comprises:
An outer frame;
The back plate is connected to one end of the outer frame so that the other end of the outer frame forms the supporting part, one end of the limiting piece is connected with the back plate, the vibrator assembly is hung on the supporting part through the elastic piece and is opposite to and spaced from the back plate, and the back plate, the outer frame, the elastic piece and the vibrator assembly are enclosed to form the sound cavity; and
The voice coil loudspeaker voice coil, the voice coil loudspeaker voice coil is located the backplate is towards one side of oscillator subassembly, and encircles the locating part sets up, the voice coil loudspeaker voice coil is kept away from the one end of backplate is hung and is located in the magnetic gap.
In one embodiment, the back plate is a flat plate structure;
and/or the backboard is made of a metal material, a high polymer material, a fiber composite material or a ceramic material;
And/or the thickness of the backboard is 0.05 mm-0.5 mm;
And/or the backboard is provided with a hollowed hole communicated with the acoustic cavity, and the hollowed hole is positioned at the inner side or/and the outer side of the voice coil;
and/or the backboard is provided with a hollowed-out hole communicated with the acoustic cavity, and the area of the hollowed-out hole is not more than 50% of the total area of the backboard;
And/or the distance from the voice coil to the inner wall of the magnetic gap is greater than the distance from the limiting piece to the wall of the limiting hole.
In one embodiment, the vibrator assembly includes:
An inner frame connected with the elastic member; and
The magnetic circuit system comprises a first magnetic conduction plate, a magnet and a second magnetic conduction plate, wherein the periphery of the first magnetic conduction plate is connected to one side of the inner frame, which faces away from the elastic piece, the magnet is arranged on one side of the first magnetic conduction plate, which faces the acoustic cavity, the second magnetic conduction plate is arranged on one side of the magnet, which faces the acoustic cavity, and the limiting hole sequentially penetrates through the first magnetic conduction plate, the magnet and the second magnetic conduction plate.
In an embodiment, the first magnetic conduction board is including bottom plate and the curb plate that is the contained angle setting, the bottom plate and/or the curb plate with the inside casing is connected, the bottom plate corresponds the locating part is equipped with first through-hole, magnet clamp locates between bottom plate and the second magnetic conduction board, magnet with the second magnetic conduction board with the curb plate interval forms the magnetic gap, magnet corresponds first through-hole is equipped with the second through-hole, the second magnetic conduction board corresponds the second through-hole is equipped with the third through-hole, first through-hole the second through-hole reaches the third through-hole communicates in proper order, and forms spacing hole.
In an embodiment, a limit step is formed on the periphery of one side, facing away from the magnet, of the bottom plate, the limit step is arranged around the first through hole, the inner frame is provided with a support table, and the support table is supported and limited on the limit step;
and/or one of the side plate and the inner wall of the inner frame is provided with a positioning protrusion, and the other one of the side plate and the inner wall of the inner frame is provided with a positioning groove, and the positioning protrusion is accommodated in and limited in the positioning groove;
and/or, one of the inner frame and the elastic piece is provided with a fixing boss, and the other one of the inner frame and the elastic piece is provided with a fixing groove, and the fixing boss is accommodated in and limited in the fixing groove;
and/or, one side of the second magnetic conduction plate adjacent to the third through hole extends towards the inside of the third through hole to form a limiting baffle table, one end of the limiting piece, which is far away from the stator assembly, is provided with a limiting boss, and the limiting baffle table is positioned between the limiting boss and the stator assembly.
In one embodiment, the limiting member is provided with a weight-reducing region; the weight-reducing area is a weight-reducing groove concavely arranged on the periphery of the limiting piece; and/or the weight-reducing area is a weight-reducing hole arranged in the middle of the limiting piece;
And/or the elastic piece is provided with a folded ring part; the folded ring part is formed by sinking one side, facing away from the acoustic cavity, of the elastic piece towards the acoustic cavity; or, the folded ring part is formed by protruding one side of the elastic piece, which is away from the acoustic cavity, towards one side, which is away from the acoustic cavity; or, the folded ring part is provided with a plurality of convex parts and a plurality of concave parts which are in continuous transition;
And/or the elastic piece is made of a super-elastic material, and the super-elastic material is one of silicone rubber and NBR, TPU, TPE;
and/or the stiffness coefficient of the elastic piece is 5N/m-50N/m;
And/or the limiting piece is made of a metal material or a high polymer material;
And/or the resonance frequency of the exciter is 50 Hz-1000 Hz.
The invention also provides electronic equipment, which comprises a shell, a screen and the exciter, wherein the screen is connected to the shell and is enclosed with the shell to form a containing cavity, the exciter is arranged in the containing cavity, and a stator assembly of the exciter is connected with the screen.
The exciter comprises a stator assembly and a vibrator assembly, wherein the stator assembly is connected with a screen of electronic equipment in an isoplanar manner, and an elastic piece is arranged to provide flexible support for the vibrator assembly and improve the vibration effect of the vibrator assembly; meanwhile, the limiting hole communicated with the acoustic cavity is formed in the vibrator assembly, and the limiting piece is arranged, so that one end of the limiting piece is connected with the stator assembly, the other end of the limiting piece is arranged in the limiting hole in a penetrating mode and is spaced from the hole wall of the limiting hole, the limiting piece is used for limiting the vibration of the vibrator assembly, when the exciter or the electronic equipment falls or collides, the vibrator assembly is limited by the limiting piece, the vibrator assembly is effectively prevented from vibrating greatly, the elastic piece is damaged by pulling, and the reliability of the exciter is improved. Further, the piezoelectric ceramic plate is arranged at one end of the limiting piece penetrating through the limiting hole, and the screen vibration is excited by utilizing the inverse piezoelectric effect of the piezoelectric ceramic plate, so that the sounding performance of the electronic equipment is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an actuator according to an embodiment of the present invention;
FIG. 2 is an exploded view of an actuator according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an actuator according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a back plate according to an embodiment of the present invention;
FIG. 5 is a schematic view of a back plate according to another embodiment of the present invention;
FIG. 6 is a schematic view of an elastic member according to an embodiment of the present invention;
FIG. 7 is a schematic view of an inner frame according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating a structure of a first magnetic conductive plate according to an embodiment of the present invention;
FIG. 9 is a schematic structural view of a limiting member according to an embodiment of the present invention;
FIG. 10 is a schematic view of a limiting member according to another embodiment of the present invention;
FIG. 11 is a schematic view of a stopper according to another embodiment of the present invention;
FIG. 12 is a schematic view of a stopper according to another embodiment of the present invention;
FIG. 13 is a graph comparing the performance of an actuator of the present invention with a conventional moving magnet actuator;
FIG. 14 is a graph comparing the performance of an actuator of the present invention with a conventional piezoelectric actuator.
Reference numerals illustrate:
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Meanwhile, the meaning of "and/or" and/or "appearing throughout the text is to include three schemes, taking" a and/or B "as an example, including a scheme, or B scheme, or a scheme that a and B satisfy simultaneously.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
In order to realize the conversion from an electric signal to an acoustic signal of an electronic device, a common transduction device comprises a moving coil type loudspeaker, a moving iron type loudspeaker, a piezoelectric loudspeaker, a capacitive loudspeaker and the like, and the principle is that the electric signal is converted into mechanical vibration so as to push air to sound. The panel sound production is to excite the hard panel to generate various orders of resonance modes, and the panel realizes sound radiation in a form of nearly random vibration. For electronic devices, the planar structure of the electronic device, such as a screen, a shell and the like, provides realizable conditions for the sounding mode. To excite the resonant modes of the panel, a means of providing excitation is necessary.
Based on the above concepts and problems, the present invention proposes an actuator 100. It will be appreciated that the exciter 100 is employed in an electronic device having a flat panel structure, such as a screen, housing, etc., and that by coupling the exciter 100 to the flat panel structure of the electronic device, such as a screen, the screen is excited with the exciter 100 to excite various orders of resonant modes, and the screen effects acoustic radiation in the form of near random vibrations.
Referring to fig. 1 to 12, in the embodiment of the invention, the exciter 100 includes a stator assembly 1, an elastic member 2, a vibrator assembly 3, a limiting member 4 and a piezoelectric ceramic plate 6, wherein the stator assembly 1 is provided with a supporting portion 111, the elastic member 2 is connected to the supporting portion 111, the vibrator assembly 3 is suspended on the supporting portion 111 through the elastic member 2, the vibrator assembly 3, the elastic member 2 and the stator assembly 1 enclose to form an acoustic cavity 5, the vibrator assembly 3 is provided with a limiting hole 322 communicated with the acoustic cavity 5, a first end of the limiting member 4 is connected with the stator assembly 1, a second end of the limiting member 4 extends out of the acoustic cavity 5 through the limiting hole 322, the limiting member 4 is spaced from a wall of the limiting hole 322, and the piezoelectric ceramic plate 6 is disposed outside the acoustic cavity 5 and is connected to a second end of the limiting member 4.
In this embodiment, the stator assembly 1 of the exciter 100 is used for being connected with a flat plate structure such as a screen of an electronic device, the vibrator assembly 3 is used for being matched with the stator assembly 1 to generate vibration, and the stator assembly 1 resonates under the vibration action of the vibrator assembly 3, so that the screen is excited to generate resonance modes of various orders, and sound radiation is realized in a form of nearly random vibration. In this embodiment, the exciter 100 can provide stable output excitation to the screen, has a low resonant frequency to match the low-order vibration of the screen, and has a strong mechanical strength to meet the use of the electronic device.
In the present embodiment, the vibrator assembly 3 is supported and mounted by the support portion 111 by providing the support portion 111 in the stator assembly 1. It can be appreciated that the supporting portion 111 may be a supporting column, a frame or a bracket, etc., and the elastic member 2 is provided to enable the vibrator assembly 3 to be suspended on the supporting portion 111 through the elastic member 2, so that the vibrator assembly 3, the elastic member 2 and the stator assembly 1 enclose to form the acoustic cavity 5, and when the stator assembly 1 and the vibrator assembly 3 cooperate, the vibrator assembly 3 vibrates and drives the stator assembly 1 to resonate.
It will be appreciated that the elastic member 2 connects the vibrator assembly 3 and the stator assembly 1 to provide flexible support for the vibrator assembly 3, and that the elastic member 2 is elastically deformed during vibration of the vibrator assembly 3 to provide suitable compliance for the exciter 100. Further, by connecting the elastic member 2 to the vibrator assembly 3, the displacement of the vibrator assembly 3 in the non-vibration direction is reduced, the vibration mode of the vibrator assembly 3 is stabilized, and the actuator 100 provides stable output excitation.
In this embodiment, by setting the limiting member 4 and setting the limiting hole 322 communicating with the acoustic cavity 5 on the vibrator assembly 3, one end of the limiting member 4 is located in the acoustic cavity 5 and connected with the stator assembly 1, and the other end of the limiting member 4 is penetrated in the limiting hole 322 and spaced from the wall of the limiting hole 322. Therefore, when the exciter 100 or the electronic equipment falls or collides, the vibrator assembly 3 is limited by the limiting piece 4, so that the vibrator assembly 3 is effectively prevented from vibrating greatly, the elastic piece 2 is damaged by pulling, and the reliability of the exciter 100 is improved. Alternatively, the limiting member 4 is made of a metal material or a polymer material.
It will be appreciated that since the conventional exciter is affected by the weight and size of the stator assembly 1, its high frequency performance is limited, by providing the piezoelectric ceramic plate 6 such that the piezoelectric ceramic plate 6 is connected to the end of the stopper 4 passing through the stopper hole 322, the piezoelectric ceramic plate 6 can be deformed or mechanically stressed by using the inverse piezoelectric effect of the piezoelectric ceramic plate 6, i.e., by energizing, so that the screen vibration can be excited to improve the frequency response performance of the electronic device at medium and high frequencies. Thus, the exciter 100 has stable output excitation in both the low frequency band and the medium and high frequency bands, and improves the sound emission performance of the full frequency band of the electronic device when applied to the electronic device. Alternatively, the piezoelectric ceramic plate 6 receives a signal greater than 5kHz during operation of the actuator 100, compensating for the high frequency performance of the actuator 100.
It will be appreciated that the piezoelectric ceramic plate 6 exhibits piston motion at low frequencies, but has a low frequency output due to the small displacement, but at high frequencies the piezoelectric ceramic plate 6 transitions to split vibrations, in which case a large output excitation is achieved. Optionally, the piezoelectric ceramic plate 6 is made of a piezoelectric ceramic material, and the piezoelectric ceramic material includes one of PZT, lead metaniobate, pbTiO 3、BaTiO3, and BNT.
The exciter 100 comprises a stator assembly 1 and a vibrator assembly 3, wherein the stator assembly 1 is connected with a screen of electronic equipment in an isoplanar manner, the vibrator assembly 3 is suspended on a supporting part 111 through an elastic piece 2 by arranging the elastic piece 2, the elastic piece 2 provides flexible support for the vibrator assembly 3, the deflection of the vibrator assembly 3 in a non-vibration direction is reduced, the vibration form of the vibrator assembly 3 is stabilized, and the exciter 100 provides stable output excitation; meanwhile, a limiting hole 322 communicated with the acoustic cavity 5 is formed in the vibrator assembly 3, and a limiting piece 4 is arranged, so that one end of the limiting piece 4 is connected with the stator assembly 1, the other end of the limiting piece 4 penetrates through the limiting hole 322 and is spaced from the hole wall of the limiting hole 322, and therefore the limiting piece 4 is utilized to limit the vibration of the vibrator assembly 3, when the exciter 100 or electronic equipment falls or collides, the limiting piece 4 is utilized to limit the vibrator assembly 3, and therefore the vibrator assembly 3 is effectively prevented from vibrating greatly, the elastic piece 2 is prevented from being damaged by pulling, and the reliability of the exciter 100 is improved; further, the piezoelectric ceramic plate 6 is arranged at one end of the limiting piece 4 penetrating through the limiting hole 322, and the piezoelectric ceramic plate 6 can generate deformation or mechanical stress by utilizing the inverse piezoelectric effect of the piezoelectric ceramic plate 6, namely, when the power is on, so that the screen vibration can be excited, and the frequency response performance of the electronic equipment at medium and high frequencies can be improved.
It can be understood that the vibrator assembly 3 is opposite to and parallel to the stator assembly 1, and the limiting member 4 and the limiting hole 322 form a gap in the horizontal direction, and the gap can limit the moving stroke of the vibrator assembly 3 in the horizontal direction, so as to realize horizontal limiting, and thus avoid the situation that the exciter 100 collides with the voice coil with the magnetic circuit under the large-amplitude impact to generate abnormal sound.
In one embodiment, the piezoelectric ceramic plate 6 is provided with a mounting hole 61, and the second end of the stopper 4 is inserted into the mounting hole 61. It can be appreciated that the mounting hole 61 is formed in the piezoelectric ceramic plate 6, so that the limiting piece 4 is arranged in the mounting hole 61 in a penetrating manner, the mounting and positioning of the piezoelectric ceramic plate 6 and the limiting piece 4 are improved, and the material of the piezoelectric ceramic plate 6 can be saved.
It will be appreciated that an electric current may be applied to the piezoelectric ceramic plate 6, and when the piezoelectric ceramic plate 6 receives an ac signal, vibration thereof is transmitted to the stator assembly 1 and the flat panel of the electronic device via the limiting member 4, thereby causing vibration and sound of the flat panel. In the present embodiment, the periphery of the piezoelectric ceramic plate 6 is in a free state, which widens the operating band of the piezoelectric ceramic plate 6, and can further bring about improvement of high-frequency performance. Alternatively, the piezoelectric ceramic plate 6 is fixedly connected with the limiting member 4 by means of adhesive or welding.
Alternatively, the mounting holes 61 are located in the central region of the piezoelectric ceramic plate 6, so that the periphery of the piezoelectric ceramic plate 6 is symmetrically disposed with the mounting holes 61, thus improving the balance of vibration. In this embodiment, the projection of the limiting hole 322 on the stator assembly 1 is located in the central area of the projection of the piezoelectric ceramic plate 6 on the stator assembly 1. Optionally, the limiting member 4 is located at a center position of the limiting hole 322.
In an embodiment, as shown in fig. 2 and 3, the outer wall of the limiting member 4 is concavely provided with a limiting groove 46 corresponding to the piezoelectric ceramic plate 6, and the hole wall of the mounting hole 61 is accommodated and limited in the limiting groove 46. It can be appreciated that the limiting groove 46 is formed in the outer wall of the limiting piece 4, so that the limiting groove 46 is utilized to limit and position the piezoelectric ceramic plate 6, and meanwhile, the connection stability is improved.
In this embodiment, the thickness of the piezoelectric ceramic plate 6 is 0.1mm to 0.5mm. Alternatively, the thickness of the piezoelectric ceramic plate 6 is 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, or the like, without limitation.
In one embodiment, as shown in fig. 2,3 and 9 to 12, a limiting boss 41 is disposed at an end of the limiting member 4 away from the stator assembly 1, and the piezoelectric ceramic plate 6 is connected to an outer wall of the limiting boss 41; the vibrator assembly 3 is provided with a limiting blocking table 3252 corresponding to the limiting boss 41, and the limiting blocking table 3252 extends towards the limiting hole 322 and is positioned between the limiting boss 41 and the stator assembly 1; and/or, the projections of the limit boss 41 and the limit stop 3252 on the vibration direction of the vibrator assembly 3 are at least partially overlapped.
It will be appreciated that the stop abutment 3252 extends inwardly of the stop aperture 322 and is located between the stop boss 41 and the stator assembly 1. The projections of the limit boss 41 and the limit stopper 3252 in the vibration direction of the vibrator assembly 1 overlap at least partially. So at spacing boss 41 and spacing fender platform 3252 mutually support, realize spacing effect in the direction of vibration to vibrator assembly 3, avoid vibrator assembly 3 to vibrate by a wide margin when the exciter 100 receives external force or falls, pull damage elastic component 2 to promote the reliability of exciter 100.
In this embodiment, the limiting boss 41 is disposed at one end of the limiting member 4 located in the limiting hole 322, at this time, the limiting boss 41 is spaced from the wall of the limiting hole 322, and forms a gap, and the gap can limit the moving stroke of the vibrator assembly 3 in the horizontal direction, so as to realize horizontal limitation, so that the situation that the exciter 100 collides with the voice coil with a magnetic circuit under a large impact to generate abnormal noise is avoided.
It can be understood that, by arranging the limiting stop platform 3252 extending towards the inside of the limiting hole 322 on the vibrator assembly 3, the limiting stop platform 3252 corresponds to the limiting boss 41 and is located between the limiting boss 41 and the stator assembly 1, that is, gaps exist between the limiting boss 41 and the limiting stop platform 3252 in the up-down direction or the vertical direction, so that the vibrator assembly 3 is limited in the up-down direction or the vertical direction by utilizing the gaps formed between the limiting boss 41 and the limiting stop platform 3252, and the vibrator assembly 3 is prevented from vibrating and pulling the elastic piece 2 greatly when the exciter 100 is subjected to an external force or falls, thereby improving the reliability of the exciter 100.
In this embodiment, when the exciter 100 is in operation, the side of the stator assembly 1 of the exciter 100 facing away from the vibrator assembly 3 is fixedly connected with the screen of the electronic device, and the vibrator assembly 3 is subjected to electromagnetic force to vibrate the vibrator assembly 3 by passing an alternating current signal through the voice coil 13 of the stator assembly 1, and then the inertial force of the vibrator assembly 3 is transmitted to the stator assembly 1 and then to the screen through the elastic member 2, so that the screen resonates and sounds. Alternatively, the resonant frequency of the exciter 100 is between 50Hz and 1000Hz, such that the frequency response curve when the exciter 100 is applied alone has a relatively stable mid-low frequency output.
It will be appreciated that the piezoelectric ceramic plate 6 is attached to the outer wall of the limit boss 41. In this embodiment, the outer wall of the end, far away from the stator assembly 1, of the limiting piece 4 is concavely provided with a limiting groove 46, the limiting groove 46 extends to the outer wall of the limiting boss 41, part of the limiting piece 4 and the limiting boss 41 penetrate through the mounting hole 61, and the hole wall of the mounting hole 61 is accommodated and limited in the limiting groove 46. Of course, in other embodiments, the piezoelectric ceramic plate 6 may be bonded or welded to the end surface of the end of the limiting member 4 away from the stator assembly 1, which is not limited herein.
In this embodiment, the piezoelectric ceramic plate 6 is located on the side of the vibrator assembly 3 facing away from the stator assembly 1 and is spaced apart from the vibrator assembly 3. It will be appreciated that the distance between the piezoelectric ceramic plate 6 and the transducer assembly 3 is greater than the maximum amplitude of the transducer assembly 3. Meanwhile, the piezoelectric ceramic plate 6 can also provide a limiting effect for the vibrator assembly 3 in the up-down direction or the vertical direction.
In one embodiment, the stop 4 has two major axis edges 42 and two minor axis edges 43 connected end to end; the limiting bosses 41 are convexly arranged on the two long shaft edges 42; or, the limit boss 41 is convexly arranged on the two short shaft edges 43; alternatively, the limiting boss 41 is provided protruding from the major axis 42 and the minor axis 43, and is provided around the periphery of the limiting member 4.
In this embodiment, as shown in fig. 1 to 3 and fig. 9 to 12, the stopper 4 has a square structure, that is, the stopper 4 has two major axis sides 42 and two minor axis sides 43 connected end to end. It will be appreciated that the two major axis edges 42 of the stop 4 are opposed and the two minor axis edges 43 of the stop 4 are opposed.
In one embodiment, as shown in fig. 9, 11 and 12, the limiting boss 41 is protruded on two short axis sides 43. It can be appreciated that the vibrator assembly 3 is provided with a limiting stop 3252 corresponding to the limiting bosses 41 of the two short-axis sides 43.
In another embodiment, the limiting boss 41 is protruded on two long axis sides 42, and the limiting boss 41 corresponding to the two long axis sides 42 of the vibrator assembly 3 is provided with a limiting blocking platform 3252.
In yet another embodiment, as shown in fig. 2 and 10, the limiting boss 41 is convexly disposed on the long axis side 42 and the short axis side 43 and is disposed around the periphery of the limiting member 4, that is, the two long axis sides 42 and the two short axis sides 43 of the limiting member 4 are both provided with the limiting boss 41, and the limiting boss 41 is disposed around the periphery of the limiting member 4 to form an annular boss structure, and at this time, the vibrator assembly 3 is provided with an annular limiting stop 3252 corresponding to the annular limiting boss 41.
In an embodiment, the limiting member 4 may also be cylindrical, and the limiting boss 41 is protruding from the periphery of the limiting member 4 and is disposed around the periphery of the limiting member 4. It can be appreciated that the limiting boss 41 and the limiting stop 3252 may be continuous annular structures, or a plurality of limiting structures may be disposed at intervals. In the vibration direction of the vibrator assembly 1, the projections of the limiting boss 41 and the limiting baffle 3252 at least partially overlap, so as to achieve the limiting effect on the vibrator assembly 1 in the vibration direction, and prevent the vibrator assembly 1 from greatly vibrating and falling off or pulling and damaging the elastic piece 2 when the exciter 100 is impacted or falls.
It will be appreciated that the spacing boss 41 is equidistant from the spacing block 3252. Optionally, the horizontal gap from the limiting boss 41 to the wall of the limiting hole 322 is the same as the horizontal gap from the limiting stop 3252 to the outer wall of the limiting member 4.
In the present embodiment, the distance from the voice coil 13 to the inner wall of the magnetic gap 321 is larger than the distance between the stopper 4 and the vibrator assembly 3 in the vibration direction perpendicular to the vibrator assembly 3. It will be appreciated that the distance between the stop 4 and the vibrator assembly 3 may be the distance of the magnetic circuit of the vibrator assembly 3 from the stop boss 41 or the distance of the stop block 3252 from the stop 4. The limiting piece 4 is utilized to generate a limiting effect on the vibration of the vibrator assembly 3, so that when the exciter 100 or electronic equipment falls or collides, the vibrator assembly 3 is positioned by utilizing the limiting piece 4, thereby effectively avoiding the vibrator assembly from generating large-amplitude vibration, pulling and damaging the elastic piece 2, and improving the reliability of the exciter 100.
In an embodiment, a magnetic gap 321 is disposed on a side of the vibrator assembly 3 facing the acoustic cavity 5, the stator assembly 1 includes an outer frame 11, a back plate 12 and a voice coil 13, wherein the back plate 12 is connected to one end of the outer frame 11, so that the other end of the outer frame 11 forms a supporting portion 111, one end of the limiting member 4 is connected to the back plate 12, the vibrator assembly 3 is suspended on the supporting portion 111 through the elastic member 2 and is opposite to and spaced from the back plate 12, so that the back plate 12, the outer frame 11, the elastic member 2 and the vibrator assembly 3 enclose to form the acoustic cavity 5, the voice coil 13 is disposed on a side of the back plate 12 facing the vibrator assembly 3 and surrounds the limiting member 4, and one end of the voice coil 13 far from the back plate 12 is suspended in the magnetic gap 321.
In this embodiment, as shown in fig. 2 to 5, the outer frame 11 may be a frame body or a frame structure, that is, the outer frame 11 has two open ends and a cavity inside. The outer frame 11 is used for supporting, mounting and fixing the back plate 12, the voice coil 13 and the vibrator assembly 3. It can be understood that the back plate 12 is connected to one end of the outer frame 11 and covers the opening at one end, and the vibrator assembly 3 is suspended on the supporting portion 111 at the other end of the outer frame 11 through the elastic member 2, so that the back plate 12, the outer frame 11, the elastic member 2 and the vibrator assembly 3 enclose to form the acoustic cavity 5.
It can be understood that a magnetic gap 321 is arranged on one side of the vibrator assembly 3 facing the acoustic cavity 5, the voice coil 13 is positioned in the acoustic cavity 5, one end of the voice coil 13 is connected with the back plate 12, and the other end is suspended in the magnetic gap 321, so that an alternating current signal is introduced into the voice coil 13, the voice coil 13 introduces the alternating current signal into the magnetic gap 321, the vibrator assembly 3 is subjected to electromagnetic force to vibrate the vibrator assembly 3, and then the inertial force of the vibrator assembly 3 is transmitted to the stator assembly 1 and then to the screen, so that the screen resonates and sounds.
In the present embodiment, the voice coil 13 is a multi-turn coil formed by winding a wire, and the back plate 12 serves to support and fix the voice coil 13 while being fixedly connected to the screen of the electronic device. It can be understood that the voice coil 13 and the piezoelectric ceramic plate 6 are respectively connected with alternating current signals, and the connection of current signals can be selectively controlled according to the application scene of the electronic equipment.
Alternatively, the back plate 12 is a flat plate structure. It will be appreciated that, in order to achieve the spacing of the spacing member 4 in the horizontal direction (i.e. perpendicular to the vibration direction of the vibrator assembly 3), the distance from the voice coil 13 to the inner wall of the magnetic gap 321 is greater than the distance between the spacing member 4 and the vibrator assembly 3. The horizontal distance between the limiting boss 41 and the magnetic circuit 32 may be the horizontal distance between the limiting stop 3252 of the magnetic circuit 32 and the limiting member 4.
It is understood that the material of the back plate 12 may be selected from a metal material, a polymer material, a fiber composite material or a ceramic material. In this embodiment, the thickness of the back plate 12 is 0.05mm to 0.5mm. Alternatively, the thickness of the back plate 12 is 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc., without limitation.
In an embodiment, the back plate 12 is provided with a hollow hole 121 communicated with the acoustic cavity 5, and the hollow hole 121 is located at the inner side or/and the outer side of the voice coil 13. It can be appreciated that the weight reduction is achieved by providing hollow areas such as the hollow holes 121 on the back plate 12, so as to improve the high-frequency sound output of the screen. Alternatively, the area of the hollowed-out hole 121 is not more than 50% of the total area of the back plate 12.
In this embodiment, the hollowed holes 121 may be selected from circular holes, oval holes, bar-shaped holes, waist-shaped holes, polygonal holes, or irregular holes, which are not limited herein. Optionally, the plurality of hollowed holes 121 includes a plurality of hollowed holes 121 arranged at intervals. Of course, in other embodiments, one end of the plurality of hollow holes 121 may be connected to form different patterns, which is not limited herein. It can be appreciated that the hollowed-out hole 121 is located on the inner side of the voice coil 13; or, the hollowed-out hole 121 is positioned at the outer side of the voice coil 13; alternatively, the hollow holes 121 are located inside and outside the voice coil 13, which is not limited herein. Alternatively, the back plate 12 material is metallic aluminum.
In an embodiment, the vibrator assembly 3 includes an inner frame 31 and a magnetic circuit 32, wherein the inner frame 31 is connected with the elastic member 2, the magnetic circuit 32 includes a first magnetic conductive plate 323, a magnet 324 and a second magnetic conductive plate 325, the periphery of the first magnetic conductive plate 323 is connected to one side of the inner frame 31 facing away from the elastic member 2, the magnet 324 is disposed on one side of the first magnetic conductive plate 323 facing the acoustic cavity 5, the second magnetic conductive plate 325 is disposed on one side of the magnet 324 facing the acoustic cavity 5, and the limiting hole 322 sequentially penetrates through the first magnetic conductive plate 323, the magnet 324 and the second magnetic conductive plate 325.
In this embodiment, as shown in fig. 2, 3 and 7, the inner frame 31 may be a frame body or a frame structure, that is, the inner frame 31 has a structure with two open ends and a cavity inside. The inner frame 31 is used for mounting, fixing and supporting the magnetic circuit 32. It can be appreciated that the inner frame 31 is disposed at the periphery of the magnetic circuit 32, and is suspended on the support 111 of the outer frame 11 at the end far from the back plate 12 by the elastic member 2.
It will be appreciated that the magnetic circuit 32 is provided with a magnetic gap 321 to facilitate providing a space for the voice coil 13 to avoid and hang, so that the voice coil 13 introduces an ac signal into the magnetic field of the magnetic circuit 32, converting the electrical signal into mechanical vibration of the magnetic circuit 32. In this embodiment, the magnetic circuit 32 is provided with the limiting hole 322, so that the magnetic gap 321 is located at the outer side of the limiting hole 322, thereby conveniently realizing the limiting effect of the horizontal direction and the vertical direction on the magnetic circuit 32 by using the matching of the limiting piece 4 and the limiting hole 322, and limiting the vibrator assembly 3 by using the limiting piece 4 when the exciter 100 or the electronic equipment falls or collides, thereby effectively avoiding the vibrator assembly 3 from greatly vibrating and pulling the damage elastic piece 2, and improving the reliability of the exciter 100.
In the present embodiment, as shown in fig. 2, 3 and 8, the magnetic circuit 32 includes a first magnetic plate 323, a magnet 324 and a second magnetic plate 325, and the magnetic circuit 32 is connected and fixed to the inner frame 31 by the first magnetic plate 323, and the magnet 324 and the second magnetic plate 325 are laminated on a side of the first magnetic plate 323 facing the back plate 12. Alternatively, the magnet 324 is a permanent magnet. It is understood that the limiting holes 322 are disposed through the first magnetic plate 323, the magnet 324 and the second magnetic plate 325 in this order.
In an embodiment, as shown in fig. 2,3 and 8, the first magnetic conductive plate 323 includes a bottom plate 3231 and a side plate 3232 disposed at an included angle, the bottom plate 3231 and/or the side plate 3232 are connected to the inner frame 31, the bottom plate 3231 is provided with a first through hole 3233 corresponding to the limiting member 4, the magnet 324 is sandwiched between the bottom plate 3231 and the second magnetic conductive plate 325, the magnet 324 and the second magnetic conductive plate 325 are spaced from the side plate 3232 to form a magnetic gap 321, the magnet 324 is provided with a second through hole 3241 corresponding to the first through hole 3233, the second magnetic conductive plate 325 is provided with a third through hole 3251 corresponding to the second through hole 3241, and the first through hole 3233, the second through hole 3241 and the third through hole 3251 are sequentially connected to form the limiting hole 322.
In the present embodiment, the bottom plate 3231 of the first magnetic conductive plate 323 is provided with a first through hole 3233 corresponding to the stopper 4, the magnet 324 is provided with a second through hole 3241 corresponding to the first through hole 3233, and the second magnetic conductive plate 325 is provided with a third through hole 3251 corresponding to the second through hole 3241, so that the first through hole 3233, the second through hole 3241 and the third through hole 3251 are sequentially communicated, and the stopper hole 322 is formed.
It will be appreciated that the first magnetic plate 323, the magnet 324, and the second magnetic plate 325 may be selected to have a ring-shaped structure, such that the first magnetic plate 323, the magnet 324, and the second magnetic plate 325 form the limiting hole 322. Of course, in other embodiments, the magnets 324 and the second magnetic conductive plates 325 include a plurality of magnets 324 and a plurality of second magnetic conductive plates 325, and the plurality of magnets 324 and the plurality of second magnetic conductive plates 325 are disposed at intervals and surround the first through holes 3233, which is not limited herein.
In the present embodiment, the first magnetic conductive plate 323 includes a bottom plate 3231 and a side plate 3232 disposed at an angle, the magnet 324 and the second magnetic conductive plate 325 are laminated on a side of the bottom plate 3231 facing the back plate 12, and the magnet 324 and the second magnetic conductive plate 325 are spaced apart from the side plate 3232 to form a magnetic gap 321.
In an embodiment, as shown in fig. 2,3, 7 and 8, a limiting step 3234 is formed on the periphery of the side of the bottom plate 3231 facing away from the magnet 324, the limiting step 3234 is disposed around the first through hole 3233, the inner frame 31 is provided with a supporting table 311, and the supporting table 311 is supported and limited on the limiting step 3234. It can be understood that the limiting step 3234 has a step structure, and the supporting table 311 supports and overlaps the limiting step 3234. Alternatively, the supporting table 311 and the limiting step 3234 may be connected by adhesive or welding, which is not limited herein.
In one embodiment, as shown in fig. 2, 3, 7 and 8, one of the side plate 3232 and the inner wall of the inner frame 31 is provided with a positioning protrusion 3235, and the other is provided with a positioning groove 312, and the positioning protrusion 3235 is accommodated and limited in the positioning groove 312. It will be appreciated that the side plates 3232 are provided with locating projections 3235 and the inner wall of the inner frame 31 is provided with locating grooves 312, the locating projections 3235 being received and retained within the locating grooves 312. Of course, the side plate 3232 is provided with a positioning groove 312, and the inner wall of the inner frame 31 is provided with a positioning protrusion 3235, which is not limited herein.
In the present embodiment, the positioning protrusion 3235 and the positioning groove 312 may be of a ring-shaped structure. Of course, the positioning protrusions 3235 and the positioning grooves 312 each include a plurality of positioning protrusions 3235 and positioning grooves 312 that are disposed in a one-to-one correspondence.
In one embodiment, as shown in fig. 2, 3, 6 and 7, one of the inner frame 31 and the elastic member 2 is provided with a fixing boss 313, and the other one is provided with a fixing groove 22, and the fixing boss 313 is accommodated and limited in the fixing groove 22. It will be appreciated that the periphery of the inner frame 31 is provided with a fixing boss 313, the inner wall of the elastic member 2 is provided with a fixing groove 22, and the fixing boss 313 is accommodated and limited in the fixing groove 22. Of course, the periphery of the inner frame 31 is provided with a fixing groove 22, and the inner wall of the elastic member 2 is provided with a fixing boss 313, which is not limited herein.
In an embodiment, as shown in fig. 3 and fig. 9 to fig. 12, a side of the second magnetic conductive plate 325 adjacent to the third through hole 3251 extends toward the inside of the third through hole 3251 to form a limiting stop 3252, and one end of the limiting member 4 away from the stator assembly 1 is provided with a limiting boss 41, and the limiting stop 3252 is located between the limiting boss 41 and the stator assembly 1.
Optionally, the second magnetic conductive plate 325 and the limiting stop 3252 are integrally formed. In this embodiment, the second magnetic conductive plate 325 and the limiting stop 3252 are located on the same plane. It can be appreciated that, in order to ensure the structure and the processing convenience of the second magnetic conductive plate 325, the limiting stop 3252 and the wall of the third through hole 3251 form a smooth transition.
In one embodiment, the stop 4 is provided with a weight-reducing region. By adjusting the weight of the stopper 4, the vibration characteristics of the back plate 12 are adjusted. The weight-reducing area may be a weight-reducing groove 44 concavely arranged at the periphery of the limiting member 4; and/or the weight-reducing area is a weight-reducing hole 45 formed in the middle of the limiting piece 4.
In this embodiment, the weight reduction area is disposed on the limiting member 4, for example, a hollowed area is disposed around or in the center of the limiting member 4, so as to achieve the purpose of weight reduction, further improve the vibration performance of the exciter 100, and further improve the sounding performance of the electronic device.
In one embodiment, as shown in fig. 11, the weight-reducing region is a weight-reducing groove 44 concavely formed on the periphery of the limiting member 4. It will be appreciated that the weight-reducing channel 44 is formed by the recess in the outer wall of the stop member 4. Alternatively, the weight-reducing groove 44 may be in the shape of a U-shaped groove, a V-shaped groove, a W-shaped groove, a wedge-shaped groove, a semicircular groove, or the like, which is not limited herein.
In the present embodiment, the weight-reducing grooves 44 include a plurality of weight-reducing grooves 44 circumferentially spaced around the outer wall of the stopper 4.
In another embodiment, as shown in fig. 12, the weight-reducing region is a weight-reducing hole 45 formed in the middle of the limiting member 4. The lightening holes 45 may be selected as through holes or through slot structures, i.e. the lightening holes 45 are provided through the limiting member 4. Alternatively, the weight-reducing holes 45 include a plurality of weight-reducing holes 45 spaced apart from each other.
In one embodiment, the elastic member 2 has a folded ring portion 21; the folded ring part 21 is formed by sinking one side of the elastic piece 2 facing away from the acoustic cavity 5 towards the inside of the acoustic cavity 5; or, the folded ring part 21 is formed by the bulge of the side of the elastic piece 2 facing away from the acoustic cavity 5 towards the side facing away from the acoustic cavity 5; alternatively, the tuck-ring portion 21 has a plurality of convex portions and a plurality of concave portions that continuously transition.
In this embodiment, as shown in fig. 2, 3 and 6, the ring-folded portion 21 is provided on the elastic member 2, so that the ring-folded portion 21 of the elastic member 2 is used to elastically buffer the vibration of the vibrator assembly 3, thereby providing an auxiliary limit function. It will be appreciated that the ring-folded portion 21 may be a protrusion or a groove structure, that is, the ring-folded portion 21 is a protrusion structure formed by protruding a side of the elastic member 2 facing away from the acoustic cavity 5 toward a side facing away from the acoustic cavity 5; or the ring-folded part 21 is a groove structure formed by recessing the side of the elastic member 2 facing away from the acoustic cavity 5 toward the inside of the acoustic cavity 5, which is not limited herein.
Alternatively, the elastic member 2 has a plurality of protrusions and a plurality of depressions that are continuously excessive, i.e., the elastic member 2 has a wave shape.
Alternatively, the elastic member 2 is made of a super-elastic material, and the super-elastic material is one of silicone rubber (e.g., fluorosilicone rubber) and NBR, TPU, TPE. It can be appreciated that by using the material of the elastic member 2 as a super-elastic material, and by selecting the material of the elastic member 2, the compliance of the elastic member 2 is further adjusted, so as to adjust the vibration characteristics of the back plate 12, and effectively enhance the output excitation of the exciter 100. Alternatively, the stiffness coefficient of the elastic member 2 is 5N/m to 50N/m.
In an embodiment, the side of the elastic member 2 facing away from the acoustic cavity 5 may further be convexly provided with a limiting structure, and the limiting structure may be a plurality of limiting protrusions arranged at intervals, or may be a continuously arranged limiting ring, and the limiting structure and the elastic member 2 are integrally formed. The elastic piece 2 is provided with a limiting structure for assisting in limiting the space of the exciter 100 away from one side of the screen, so that the vibrator assembly 1 is prevented from touching a shell or other parts of the electronic equipment when the vibration amplitude is overlarge, and the vibration effect is prevented from being influenced or the shell is prevented from being damaged.
Compared with the existing dynamic magnetic exciter, the exciter 100 of the invention performs performance test, as shown in fig. 13, the exciter 100 of the invention is characterized in that the piezoelectric ceramic plate 6 is arranged outside the acoustic cavity 5 and is connected with the second end of the limiting piece 4, which passes through the limiting hole 322 and extends out of the acoustic cavity 5, and the piezoelectric ceramic plate 6 can generate deformation or mechanical stress by utilizing the inverse piezoelectric effect of the piezoelectric ceramic plate 6, namely, when the exciter is electrified, so that the screen vibration can be excited, and the frequency response performance of the electronic equipment at medium and high frequencies is improved.
Compared with the existing piezoelectric actuator, the actuator 100 of the invention performs performance test, as shown in fig. 14, the actuator 100 of the invention sets the piezoelectric ceramic plate 6 outside the acoustic cavity 5 and is connected with the second end of the limiting piece 4 penetrating through the limiting hole 322 and extending out of the acoustic cavity 5, and the elastic piece 2 is matched to provide flexible support for the vibrator assembly 3, so that the deflection of the vibrator assembly 3 in the non-vibration direction is reduced, the vibration form of the vibrator assembly 3 is stabilized, the actuator 100 provides stable output excitation, and the low-frequency performance of the electronic equipment is improved.
The invention also provides an electronic device, which comprises a casing, a screen and the exciter 100, wherein the specific structure of the exciter 100 refers to the foregoing embodiments, and the electronic device adopts all the technical schemes of all the foregoing embodiments, so that the electronic device at least has all the beneficial effects brought by the technical schemes of the foregoing embodiments, and will not be described in detail herein.
In this embodiment, the screen is connected to the casing and forms a cavity with the casing, the exciter 100 is disposed in the cavity, and the stator assembly 1 of the exciter 100 is connected to the screen.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structural modifications made by the present description and accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (14)
1. An actuator, the actuator comprising:
The stator assembly is provided with a supporting part;
The elastic piece is connected to the supporting part;
The vibrator assembly is hung on the supporting part through the elastic piece, an acoustic cavity is formed by enclosing the vibrator assembly, the elastic piece and the stator assembly, and the vibrator assembly is provided with a limiting hole communicated with the acoustic cavity;
The first end of the limiting piece is connected with the stator assembly, the second end of the limiting piece penetrates through the limiting hole to extend out of the acoustic cavity, and the limiting piece is spaced from the wall of the limiting hole; and
The piezoelectric ceramic plate is arranged outside the acoustic cavity and connected to the second end of the limiting piece;
The one end that the locating part kept away from stator module is equipped with spacing boss, oscillator module corresponds spacing boss is equipped with spacing fender platform, spacing boss with spacing fender platform is in the ascending projection of oscillator module's vibration direction overlaps at least partially.
2. The actuator of claim 1, wherein the piezoelectric ceramic plate is provided with a mounting hole, and the second end of the stopper is disposed through the mounting hole.
3. The actuator according to claim 2, wherein the outer wall of the limiting member is concavely provided with a limiting groove corresponding to the piezoelectric ceramic plate, and the hole wall of the mounting hole is accommodated in and limited in the limiting groove.
4. An actuator according to claim 3, wherein the mounting hole is located in a central region of the piezoelectric ceramic plate;
And/or the projection of the limiting hole on the stator assembly is positioned in the central area of the projection of the piezoelectric ceramic plate on the stator assembly.
5. The actuator of claim 1, wherein the piezoelectric ceramic plate is made of a piezoelectric ceramic material, and the piezoelectric ceramic material comprises one of PZT, lead metaniobate, pbTiO 3、BaTiO3, and BNT;
And/or the thickness of the piezoelectric ceramic plate is 0.1 mm-0.5 mm.
6. The actuator of claim 1, wherein the piezoelectric ceramic plate is attached to an outer wall of the limit boss;
the limiting baffle extends towards the inside of the limiting hole and is positioned between the limiting boss and the stator assembly.
7. The actuator of claim 6, wherein the stop has two major axis sides and two minor axis sides joined end to end; the limiting bosses are convexly arranged on the two long shaft sides; or, the limiting boss is convexly arranged on the two short shaft edges; or, the limiting boss is convexly arranged on the long axis side and the short axis side and is arranged around the periphery of the limiting piece;
or, the limiting piece is cylindrical, and the limiting boss is convexly arranged on the periphery of the limiting piece and surrounds the periphery of the limiting piece.
8. The exciter according to claim 1, wherein a side of the vibrator assembly facing the acoustic cavity is provided with a magnetic gap, the stator assembly comprising:
An outer frame;
The back plate is connected to one end of the outer frame so that the other end of the outer frame forms the supporting part, one end of the limiting piece is connected with the back plate, the vibrator assembly is hung on the supporting part through the elastic piece and is opposite to and spaced from the back plate, and the back plate, the outer frame, the elastic piece and the vibrator assembly are enclosed to form the sound cavity; and
The voice coil loudspeaker voice coil, the voice coil loudspeaker voice coil is located the backplate is towards one side of oscillator subassembly, and encircles the locating part sets up, the voice coil loudspeaker voice coil is kept away from the one end of backplate is hung and is located in the magnetic gap.
9. The actuator of claim 8, wherein the back plate is a flat plate structure;
and/or the backboard is made of a metal material, a high polymer material, a fiber composite material or a ceramic material;
And/or the thickness of the backboard is 0.05 mm-0.5 mm;
And/or the backboard is provided with a hollowed hole communicated with the acoustic cavity, and the hollowed hole is positioned at the inner side or/and the outer side of the voice coil;
and/or the backboard is provided with a hollowed-out hole communicated with the acoustic cavity, and the area of the hollowed-out hole is not more than 50% of the total area of the backboard;
And/or the distance from the voice coil to the inner wall of the magnetic gap is greater than the distance from the limiting piece to the wall of the limiting hole.
10. The exciter of claim 1, wherein said vibrator assembly comprises:
An inner frame connected with the elastic member; and
The magnetic circuit system comprises a first magnetic conduction plate, a magnet and a second magnetic conduction plate, wherein the periphery of the first magnetic conduction plate is connected to one side of the inner frame, which faces away from the elastic piece, the magnet is arranged on one side of the first magnetic conduction plate, which faces the acoustic cavity, the second magnetic conduction plate is arranged on one side of the magnet, which faces the acoustic cavity, and the limiting hole sequentially penetrates through the first magnetic conduction plate, the magnet and the second magnetic conduction plate.
11. The exciter of claim 10, wherein the first magnetically permeable plate comprises a bottom plate and a side plate which are arranged at an included angle, the bottom plate and/or the side plate is/are connected with the inner frame, the bottom plate is provided with a first through hole corresponding to the limiting piece, the magnet is clamped between the bottom plate and the second magnetically permeable plate, a magnetic gap is formed between the magnet and the second magnetically permeable plate and the side plate at intervals, the magnet is provided with a second through hole corresponding to the first through hole, the second magnetically permeable plate is provided with a third through hole corresponding to the second through hole, and the first through hole, the second through hole and the third through hole are sequentially communicated and form the limiting hole.
12. The exciter according to claim 11, wherein a limit step is formed on the periphery of the side of the bottom plate facing away from the magnet, the limit step is arranged around the first through hole, the inner frame is provided with a support table, and the support table is supported and limited on the limit step;
and/or one of the side plate and the inner wall of the inner frame is provided with a positioning protrusion, and the other one of the side plate and the inner wall of the inner frame is provided with a positioning groove, and the positioning protrusion is accommodated in and limited in the positioning groove;
and/or, one of the inner frame and the elastic piece is provided with a fixing boss, and the other one of the inner frame and the elastic piece is provided with a fixing groove, and the fixing boss is accommodated in and limited in the fixing groove;
and/or, one side of the second magnetic conduction plate adjacent to the third through hole extends towards the inside of the third through hole to form a limiting baffle table, one end of the limiting piece, which is far away from the stator assembly, is provided with a limiting boss, and the limiting baffle table is positioned between the limiting boss and the stator assembly.
13. The actuator of claim 1, wherein the stop member is provided with a weight-reducing region; the weight-reducing area is a weight-reducing groove concavely arranged on the periphery of the limiting piece; and/or the weight-reducing area is a weight-reducing hole arranged in the middle of the limiting piece;
And/or the elastic piece is provided with a folded ring part; the folded ring part is formed by sinking one side, facing away from the acoustic cavity, of the elastic piece towards the acoustic cavity; or, the folded ring part is formed by protruding one side of the elastic piece, which is away from the acoustic cavity, towards one side, which is away from the acoustic cavity; or, the folded ring part is provided with a plurality of convex parts and a plurality of concave parts which are in continuous transition;
And/or the elastic piece is made of a super-elastic material, and the super-elastic material is one of silicone rubber and NBR, TPU, TPE;
and/or the stiffness coefficient of the elastic piece is 5N/m-50N/m;
And/or the limiting piece is made of a metal material or a high polymer material;
And/or the resonance frequency of the exciter is 50 Hz-1000 Hz.
14. An electronic device, comprising a casing, a screen and an exciter according to any one of claims 1 to 13, wherein the screen is connected to the casing and encloses a cavity with the casing, the exciter is disposed in the cavity, and a stator assembly of the exciter is connected to the screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211110316.7A CN115334422B (en) | 2022-09-13 | 2022-09-13 | Exciter and electronic equipment |
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| CN202211110316.7A CN115334422B (en) | 2022-09-13 | 2022-09-13 | Exciter and electronic equipment |
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| CN115334422A CN115334422A (en) | 2022-11-11 |
| CN115334422B true CN115334422B (en) | 2024-07-30 |
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| CN202211110316.7A Active CN115334422B (en) | 2022-09-13 | 2022-09-13 | Exciter and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN218352728U (en) * | 2022-09-13 | 2023-01-20 | 歌尔股份有限公司 | Exciter and electronic device |
| CN218352729U (en) * | 2022-09-13 | 2023-01-20 | 歌尔股份有限公司 | Exciter and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR200295460Y1 (en) * | 2002-08-28 | 2002-11-18 | 에스 앤 테크 주식회사 | bone conductiong speaker |
| JP4784398B2 (en) * | 2006-05-29 | 2011-10-05 | パナソニック株式会社 | Acoustic exciter and speaker using the same |
| KR20190038138A (en) * | 2017-09-29 | 2019-04-08 | 자화전자(주) | Linear vibration generating device |
| CN109040916B (en) * | 2018-07-02 | 2020-09-22 | 歌尔股份有限公司 | Vibrator assembly for exciter, exciter and screen sounding device |
| CN109040917B (en) * | 2018-07-02 | 2021-10-08 | 歌尔股份有限公司 | Exciter and screen sounding device |
| KR102149025B1 (en) * | 2018-12-17 | 2020-10-14 | (주)파트론 | Acoustic and vibration generator |
| KR102264328B1 (en) * | 2019-09-20 | 2021-06-14 | (주)파트론 | A vibrator and electronic device including thereof |
| CN210899494U (en) * | 2019-11-29 | 2020-06-30 | 深圳市信维声学科技有限公司 | Electromagnetic exciter and screen sounding device |
| CN210641064U (en) * | 2019-12-07 | 2020-05-29 | 歌尔科技有限公司 | Exciter and electronic product |
| CN111343543B (en) * | 2020-03-24 | 2025-03-11 | 歌尔股份有限公司 | Actuator, electronic device and method |
| CN114425509A (en) * | 2021-12-31 | 2022-05-03 | 歌尔股份有限公司 | Vibration exciter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN218352728U (en) * | 2022-09-13 | 2023-01-20 | 歌尔股份有限公司 | Exciter and electronic device |
| CN218352729U (en) * | 2022-09-13 | 2023-01-20 | 歌尔股份有限公司 | Exciter and electronic device |
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