CN115334422A - Exciter and electronic device - Google Patents
Exciter and electronic device Download PDFInfo
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- CN115334422A CN115334422A CN202211110316.7A CN202211110316A CN115334422A CN 115334422 A CN115334422 A CN 115334422A CN 202211110316 A CN202211110316 A CN 202211110316A CN 115334422 A CN115334422 A CN 115334422A
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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
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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
- H04R9/02—Details
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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
- 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)
- Transducers For Ultrasonic Waves (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
The invention discloses an exciter and electronic equipment, wherein the exciter comprises a stator component, an elastic part, a vibrator component, a limiting part and a piezoelectric ceramic plate, the stator component is provided with a supporting part, the elastic part is connected with the supporting part, the vibrator component is suspended on the supporting part through the elastic part, the vibrator component, the elastic part and the stator component enclose to form an acoustic cavity, the vibrator component is provided with a limiting hole communicated with the acoustic cavity, the first end of the limiting part is connected with the stator component, the first end of the limiting part penetrates through the limiting hole to extend out of the acoustic cavity, the limiting part is spaced from the hole 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 part. The exciter has high reliability and good excitation performance, and can be applied to electronic equipment to improve the sound production performance of the electronic equipment.
Description
Technical Field
The invention relates to the technical field of electroacoustic conversion, in particular to an exciter and electronic equipment applying the same.
Background
In order to convert an electrical signal of an electronic device into an acoustic signal, common transduction devices include a moving-coil speaker, a moving-iron speaker, a piezoelectric speaker, a capacitive speaker, and the like. The panel sounding is to excite a hard panel to generate various resonant modes, and the panel realizes sound radiation in a form of approximate random vibration. For the electronic equipment, the plane structure of the electronic equipment, such as a screen, a shell and the like, provides realizable conditions for the sound production mode. To excite the resonant modes of the slab, a means to provide excitation is necessary.
In the related art, the excitation device generally cannot provide stable excitation for the flat panel, and lacks positioning in the excitation process, and when falling or collision occurs, the parts are rubbed and bumped, so that the vibration effect is influenced, and the sound production performance of the electronic device is further influenced.
Disclosure of Invention
The invention mainly aims to provide an exciter with high reliability and good excitation performance, and the exciter can improve the sound production performance of electronic equipment when being applied to the electronic equipment.
To achieve the above object, the present invention provides an actuator, comprising:
a stator assembly provided with a support part;
the elastic piece is connected to the supporting part;
the vibrator assembly is suspended on the supporting part through the elastic piece, the vibrator assembly, the elastic piece and the stator assembly enclose to form a sound cavity, and the vibrator assembly is provided with a limiting hole communicated with the sound cavity;
a first end of the limiting piece is connected with the stator assembly, a second end of the limiting piece penetrates through the limiting hole and extends out of the sound cavity, and the limiting piece is spaced from the hole wall of the limiting hole; and
a piezoelectric ceramic plate, the piezoelectric ceramic plate is located the outside in sound chamber, and connect in the second end of locating part.
In an embodiment, the piezoelectric ceramic plate is provided with a mounting hole, and the second end of the limiting member is inserted into the mounting hole.
In an embodiment, 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 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 includes PZT, lead meta-niobate, pbTiO 3 、BaTiO 3 Or BNT;
and/or the thickness of the piezoelectric ceramic plate is 0.1 mm-0.5 mm.
In one embodiment, one end of the limiting piece, which is far away from the stator assembly, is provided with a limiting boss, and the piezoelectric ceramic plate is connected to the outer wall of the limiting boss;
the vibrator component is provided with a limiting baffle table corresponding to the limiting boss, and the limiting baffle table extends towards the limiting hole and is positioned between the limiting boss and the stator component; and/or projections of the limiting boss and the limiting baffle table in the vibration direction of the vibrator assembly are at least partially overlapped.
In one embodiment, the stopper 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 edges; or the limit bosses are convexly arranged on the two short shaft edges; or, the limit boss is convexly arranged on the long shaft side and the short shaft side and is arranged around the periphery of the limit piece;
or, the locating part is cylindrical, and the limiting boss is convexly arranged on the periphery of the locating part and surrounds the periphery of the locating part.
In one embodiment, 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 part is connected with the back plate, and the vibrator component is suspended on the supporting part through the elastic part and is opposite to and spaced from the back plate, so that the back plate, the outer frame, the elastic part and the vibrator component are encircled to form the sound cavity; and
the voice coil is arranged on one side, facing the vibrator assembly, of the back plate and surrounds the limiting part, and one end, far away from the back plate, of the voice coil is suspended 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 back plate is 0.05 mm-0.5 mm;
and/or the back plate is provided with a hollow hole communicated with the sound cavity, and the hollow hole is positioned on the inner side or/and the outer side of the voice coil;
and/or the back plate is provided with a hollow hole communicated with the sound cavity, and the area of the hollow hole is not more than 50% of the total area of the back plate;
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:
the inner frame is connected with the elastic piece; 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 the back of the inner frame to one side of the elastic part, the magnet is arranged on one side, facing the sound cavity, of the first magnetic conduction plate, the second magnetic conduction plate is arranged on one side, facing the sound cavity, of the magnet, and the limiting holes sequentially penetrate through the first magnetic conduction plate, the magnet and the second magnetic conduction plate.
In an embodiment, the first magnetic conduction plate includes a bottom plate and a side plate that are included angles, the bottom plate and/or the side plate with inside casing connection, the bottom plate corresponds the locating part is equipped with first through-hole, the magnet clamp is located between bottom plate and the second magnetic conduction plate, magnet with the second magnetic conduction plate with the side plate interval forms the magnetic gap, magnet corresponds first through-hole is equipped with the second through-hole, the second magnetic conduction plate 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 one embodiment, a limiting step is formed on the periphery of one side of the bottom plate, which faces away from the magnet, the limiting step is arranged around the first through hole, and a supporting table is arranged on the inner frame and supports and limits the limiting step;
and/or, one of the side plate and the inner wall of the inner frame is provided with a positioning bulge, the other of the side plate and the inner wall of the inner frame is provided with a positioning groove, and the positioning bulge is accommodated and limited in the positioning groove;
and/or, one of the inner frame and the elastic piece is provided with a fixing boss, the other of the inner frame and the elastic piece is provided with a fixing groove, and the fixing boss is accommodated and limited in the fixing groove;
and/or one side of the second magnetic conduction plate, which is adjacent to the third through hole, extends towards the inside of the third through hole to form a limiting stop table, a limiting boss is arranged at one end, which is far away from the stator assembly, of the limiting part, and the limiting stop table is positioned between the limiting boss and the stator assembly.
In one embodiment, the limiting member is provided with a weight reduction area; the weight reduction area is a weight reduction groove concavely arranged on the periphery of the limiting piece; and/or the weight reduction area is a weight reduction hole arranged in the middle of the limiting part;
and/or the elastic piece is provided with a folded ring part; the folded ring part is formed by sinking one side of the elastic part back to the sound cavity towards the sound cavity; or the bending ring part is formed by the protrusion of one side of the elastic part back to the acoustic cavity towards one side of the elastic part back to 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 part is made of a super elastomer material, and the super elastomer material is one of silicon rubber, fluorosilicone rubber, NBR, TPU and 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 machine shell, a screen and the exciter, wherein the screen is connected with the machine shell and forms a cavity with the machine shell in a surrounding manner, the exciter is arranged in the cavity, and a stator assembly of the exciter is connected with the screen.
The exciter in the technical scheme of the invention comprises a stator component and a vibrator component, wherein the stator component 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 component and improve the vibration effect of the vibrator component; meanwhile, a limiting hole communicated with the sound cavity is formed in the vibrator component, the limiting part is arranged, one end of the limiting part is connected with the stator component, the other end of the limiting part penetrates through the limiting hole and is spaced from the hole wall of the limiting hole, the limiting part is utilized to generate a limiting effect on vibration of the vibrator component, so that when the exciter or the electronic equipment falls or collides, the limiting part is utilized to limit the vibrator component, the vibrator component is effectively prevented from vibrating by a large margin, the phenomenon that the elastic component is damaged by pulling is effectively avoided, and the reliability of the exciter is improved. Furthermore, one end of the limiting piece penetrating through the limiting hole is provided with a piezoelectric ceramic plate, and the inverse piezoelectric effect of the piezoelectric ceramic plate is utilized, so that the screen vibration is stimulated, and the sound production 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 used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an actuator according to an embodiment of the present invention;
FIG. 2 is an exploded view of an actuator in accordance with an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an actuator according to an embodiment of the invention;
FIG. 4 is a schematic view 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 embodiment of an elastic member;
FIG. 7 is a schematic view of an inner frame according to an embodiment of the present invention;
fig. 8 is a schematic structural view of a first magnetic conductive plate according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a limiting element according to an embodiment of the invention;
FIG. 10 is a schematic diagram illustrating a position-limiting element according to another embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a position limiting element according to another embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a position-limiting element according to still another embodiment of the present invention;
FIG. 13 is a graph comparing the performance of the actuator of the present invention with a prior art moving magnet actuator;
fig. 14 is a graph comparing the performance of the actuator of the present invention with that of a conventional piezoelectric actuator.
The reference numbers indicate:
the implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
Also, the expression "and/or" and/or "as used throughout is meant to encompass three alternatives, exemplified by" A and/or B "including alternative A, alternative B, or both alternative A and alternative B.
In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In order to convert an electrical signal of an electronic device into an acoustic signal, a common transduction device includes a moving-coil speaker, a moving-iron speaker, a piezoelectric speaker, a capacitive speaker, etc. the principle of the transduction device is to convert the electrical signal into mechanical vibration, so as to push air to produce sound. The panel sounding is to excite the hard plate to generate various resonant modes, and the panel realizes sound radiation in a form close to random vibration. For the electronic equipment, the plane structure of the electronic equipment, such as a screen, a shell and the like, provides realizable conditions for the sound production mode. To excite the resonant modes of the slab, a means to provide excitation is necessary.
Based on the above-mentioned concept and problems, the present invention proposes an exciter 100. It will be appreciated that the exciter 100 is applicable to electronic devices having a flat panel structure, such as a screen, a housing, etc., and that by coupling the exciter 100 to the flat panel structure of the electronic device, such as a screen, which is excited into resonant modes of various orders by the exciter 100, the screen effects acoustic radiation in the form of near random vibrations.
Referring to fig. 1 to 12, in an embodiment of the present invention, the exciter 100 includes a stator assembly 1, an elastic element 2, a vibrator assembly 3, a limiting element 4, and a piezoelectric ceramic plate 6, wherein the stator assembly 1 has a supporting portion 111, the elastic element 2 is connected to the supporting portion 111, the vibrator assembly 3 is suspended on the supporting portion 111 through the elastic element 2, the vibrator assembly 3, the elastic element 2, and the stator assembly 1 enclose to form a sound cavity 5, the vibrator assembly 3 has a limiting hole 322 communicating with the sound cavity 5, a first end of the limiting element 4 is connected to the stator assembly 1, a second end of the limiting element 4 extends out of the sound cavity 5 through the limiting hole 322, the limiting element 4 is spaced from a hole wall of the limiting hole 322, and the piezoelectric ceramic plate 6 is disposed outside the sound cavity 5 and connected to the second end of the limiting element 4.
In the present embodiment, the stator assembly 1 of the exciter 100 is configured to be connected to a flat structure such as a screen of an electronic device, the vibrator assembly 3 is configured to cooperate with the stator assembly 1 to generate vibration, and the stator assembly 1 generates resonance under the vibration effect of the vibrator assembly 3, so as to excite the screen to generate resonant modes of various orders, so that the screen realizes sound radiation in a form close to random vibration. In this embodiment, the exciter 100 can provide stable output excitation to the screen, and has a lower resonant frequency to match the low-order vibration of the screen, and has a stronger mechanical strength to satisfy the use of the electronic device.
In the present embodiment, the support portion 111 is provided to the stator assembly 1, and the vibrator assembly 3 is supported and mounted by the support portion 111. It can be understood that the supporting portion 111 may be a supporting column, a frame or a bracket, and the elastic element 2 is disposed, so that the vibrator assembly 3 is suspended from the supporting portion 111 through the elastic element 2, and thus the vibrator assembly 3, the elastic element 2 and the stator assembly 1 surround to form the acoustic cavity 5, so that when the stator assembly 1 and the vibrator assembly 3 cooperate with each other, the vibrator assembly 3 vibrates and drives the stator assembly 1 to resonate.
It will be appreciated that the resilient member 2 connects the vibrator assembly 3 and the stator assembly 1 to provide a flexible support for the vibrator assembly 3, and that the resilient member 2 is elastically deformed during vibration of the vibrator assembly 3 to provide suitable compliance for the exciter 100. In addition, the elastic member 2 is connected to the vibrator assembly 3, so that the vibration mode of the vibrator assembly 3 is stabilized by reducing the deviation of the vibrator assembly 3 in the non-vibration direction, and the exciter 100 provides stable output excitation.
In this embodiment, by providing the limiting member 4 and providing the limiting hole 322 communicating with the acoustic cavity 5 on the vibrator component 3, one end of the limiting member 4 is located in the acoustic cavity 5 and connected to the stator assembly 1, and the other end of the limiting member 4 penetrates through the limiting hole 322 and is spaced from the hole wall of the limiting hole 322. Therefore, when the exciter 100 or the electronic device falls or collides, the limiting part 4 is used for limiting the vibrator component 3, so that the vibrator component 3 is effectively prevented from vibrating to a large extent, the elastic part 2 is pulled and damaged, and the reliability of the exciter 100 is improved. Optionally, the limiting member 4 is made of a metal material or a polymer material.
It can be understood that, because the traditional exciter receives the influence of stator module 1 weight and size, its high frequency performance is restricted, through setting up piezoceramics board 6 for piezoceramics board 6 is connected in the one end that spacing hole 322 was passed to locating part 4, thereby utilizes the reverse piezoelectricity effect of piezoceramics board 6, and when circular telegram promptly, piezoceramics board 6 can produce deformation or mechanical stress, thereby can encourage the screen vibration, with the frequency response performance of improvement electronic equipment at medium-high frequency. Therefore, the exciter 100 has stable output excitation in low-frequency bands and medium-high frequency bands, and when the exciter is applied to electronic equipment, the full-frequency-band sounding performance of the electronic equipment is improved. Alternatively, when the actuator 100 is in operation, the piezoelectric ceramic plate 6 receives a signal greater than 5kHz to compensate for the high frequency performance of the actuator 100.
It will be appreciated that the piezoceramic plate 6 exhibits piston motion at low frequencies but has a low frequency output capability due to a small displacement, but a large output excitation is achieved when the piezoceramic plate 6 transitions to a split vibration at high frequencies. Optionally, the piezoelectric ceramic plate 6 is made of a piezoelectric ceramic material, and the piezoelectric ceramic material includes PZT, lead meta-niobate, pbTiO 3 、BaTiO 3 And BNT.
The exciter 100 of the invention comprises a stator assembly 1 and a vibrator assembly 3, wherein the stator assembly 1 is connected with the screen of the electronic device in an isoplanar manner, the vibrator assembly 3 is suspended on a supporting part 111 through the elastic part 2 by arranging the elastic part 2, the elastic part 2 provides flexible support for the vibrator assembly 3, the deviation of the vibrator assembly 3 in the 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 sound cavity 5 is formed in the vibrator component 3, and a limiting piece 4 is arranged, so that one end of the limiting piece 4 is connected with the stator component 1, and 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 the limiting piece 4 is utilized to limit the vibration of the vibrator component 3, so that when the exciter 100 or the electronic equipment falls or collides, the limiting piece 4 is utilized to limit the vibration of the vibrator component 3, and therefore the vibrator component 3 is effectively prevented from generating large-amplitude vibration, the elastic component 2 is prevented from being pulled and damaged, and the reliability of the exciter 100 is improved; furthermore, the piezoelectric ceramic plate 6 is arranged at one end of the limiting part 4 penetrating through the limiting hole 322, and the inverse piezoelectric effect of the piezoelectric ceramic plate 6 is utilized, namely, when the power is on, the piezoelectric ceramic plate can generate deformation or mechanical stress, so that the screen can be excited to vibrate, and the frequency response performance of the electronic equipment at medium and high frequencies is improved.
It can be understood that the vibrator component 3 and the stator component 1 are arranged oppositely and in parallel, the limiting part 4 and the limiting hole 322 form a gap in the horizontal direction, and the gap can limit the moving stroke of the vibrator component 3 in the horizontal direction, so that horizontal limiting is realized, and the situation that the exciter 100 generates abnormal sound due to the fact that the voice coil is rubbed and touched by a magnetic circuit under the condition of large-amplitude impact is avoided.
In one embodiment, the piezoelectric ceramic plate 6 is provided with a mounting hole 61, and the second end of the limiting member 4 is inserted into the mounting hole 61. It can be understood that, by arranging the mounting hole 61 on the piezoelectric ceramic plate 6, the limiting member 4 is arranged in the mounting hole 61 in a penetrating manner, so that the mounting and positioning of the piezoelectric ceramic plate 6 and the limiting member 4 are improved, and the material of the piezoelectric ceramic plate 6 can be saved.
It can be understood that, can let in electric current in the piezoceramics board 6, when piezoceramics board 6 received alternating current signal, its vibration transmits to stator module 1 and electronic equipment's flat board through locating part 4, and then causes the flat vibration sound production. In this embodiment, the periphery of the piezoelectric ceramic plate 6 is in a free state, and the operating band of the piezoelectric ceramic plate 6 is widened, which can further improve the high-frequency performance. Optionally, the piezoelectric ceramic plate 6 is fixedly connected to the limiting member 4 by means of adhesive or welding.
Alternatively, the mounting hole 61 is located in the central area of the piezoelectric ceramic plate 6 so that the periphery of the piezoelectric ceramic plate 6 is symmetrically arranged around the mounting hole 61, thus improving the balance of vibration. In the present 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 the center 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 received and limited in the limiting groove 46. It can be understood that, by providing the limiting groove 46 on the outer wall of the limiting member 4, the connection stability is improved while the piezoelectric ceramic plate 6 is limited and positioned by the limiting groove 46.
In the present embodiment, the piezoelectric ceramic plate 6 has a thickness of 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 an embodiment, as shown in fig. 2, 3, 9 to 12, a limiting boss 41 is provided 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 component 3 is provided with a limit stop 3252 corresponding to the limit boss 41, and the limit stop 3252 extends towards the limit hole 322 and is positioned between the limit boss 41 and the stator component 1; and/or projections of the limit boss 41 and the limit stop 3252 in the vibration direction of the vibrator assembly 3 are at least partially overlapped.
It will be appreciated that the limit stop 3252 extends towards the limit aperture 322 and is located between the limit stop 41 and the stator assembly 1. The projections of the limit projection 41 and the limit stopper 3252 in the vibration direction of the vibrator assembly 1 are at least partially overlapped. Therefore, the limiting boss 41 and the limiting blocking table 3252 are mutually matched to limit the vibrator assembly 3 in the vibration direction, and the vibrator assembly 3 is prevented from largely vibrating and dragging to damage the elastic element 2 when the exciter 100 is subjected to external force or falls, so that the reliability of the exciter 100 is improved.
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 hole wall of the limiting hole 322 to form a gap, and the gap can limit the moving stroke of the vibrator assembly 3 in the horizontal direction, so that horizontal limiting is achieved, and thus the situation that the magnetic circuit of the exciter 100 rubs against the voice coil to generate abnormal sound under large-amplitude impact is avoided.
It can be understood that, through set up the spacing fender platform 3252 that extends towards spacing hole 322 on vibrator subassembly 3, make spacing fender platform 3252 correspond with spacing boss 41, and be located between spacing boss 41 and stator module 1, there is the clearance also in spacing boss 41 and spacing fender platform 3252 in upper and lower direction or vertical direction, thereby utilize spacing boss 41 and spacing fender platform 3252 in the clearance that upper and lower direction or vertical direction formed, realize the spacing effect of upper and lower direction and vertical direction to vibrator subassembly 3, avoid vibrator subassembly 3 to receive external force or when falling vibration by a wide margin when exciter 100, drag damage elastic component 2, thereby promote the reliability of exciter 100.
In this embodiment, when the exciter 100 works, one side of the stator assembly 1 of the exciter 100, which faces away from the vibrator assembly 3, is connected and fixed with a screen of the electronic device, and the voice coil 13 of the stator assembly 1 is energized with an alternating current signal, so that the vibrator assembly 3 vibrates under the action of electromagnetic force, and then the inertia force of the vibrator assembly 3 is transmitted to the stator assembly 1 through the elastic member 2, and then transmitted to the screen, so that the screen resonates and sounds. Optionally, the resonant frequency of the exciter 100 is between 50Hz and 1000Hz, so that the frequency response curve of the exciter 100 when acting alone has a relatively stable medium-low frequency output.
It will be appreciated that the piezoceramic plate 6 is attached to the outer wall of the retaining boss 41. In this embodiment, a limiting groove 46 is concavely disposed on an outer wall of one end of the limiting member 4 away from the stator assembly 1, the limiting groove 46 extends to an outer wall of the limiting boss 41, a part of the limiting member 4 and the limiting boss 41 penetrate through the mounting hole 61, and a 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 also be connected to the end surface of the limiting member 4 away from the stator assembly 1 by bonding or welding, which is not limited herein.
In the present embodiment, the piezoelectric ceramic plate 6 is located on a side of the vibrator assembly 3 facing away from the stator assembly 1, and is spaced apart from the vibrator assembly 3. It is understood that the distance between the piezoelectric ceramic plate 6 and the vibrator assembly 3 is larger than the maximum amplitude of the vibrator assembly 3. Meanwhile, the piezoelectric ceramic plate 6 can also provide a limit function for the vibrator assembly 3 in the up-down direction or the vertical direction.
In one embodiment, the position-limiting member 4 has two long axis sides 42 and two short axis sides 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 protruded from the long axis edge 42 and the short axis edge 43 and is disposed around the periphery of the limiting member 4.
In the present embodiment, as shown in fig. 1 to 3 and 9 to 12, the position-limiting element 4 has a square structure, that is, the position-limiting element 4 has two long-axis sides 42 and two short-axis sides 43 connected end to end. It will be appreciated that the two major axis sides 42 of the retaining member 4 are opposed and the two minor axis sides 43 of the retaining member 4 are opposed.
In one embodiment, as shown in fig. 9, 11 and 12, the stop bosses 41 are raised from the two short sides 43. It is understood that the limit bosses 41 of the vibrator assembly 3 corresponding to the two short sides 43 are provided with the limit stops 3252.
In another embodiment, the limiting bosses 41 are protruded from the two long-axis sides 42, and the limiting boss 41 of the vibrator assembly 3 corresponding to the two long-axis sides 42 is provided with the limiting stop 3252.
In another embodiment, as shown in fig. 2 and 10, the limiting bosses 41 are protruded from the long axis sides 42 and the short axis sides 43 and are 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 bosses 41, and the limiting bosses 41 are disposed around the periphery of the limiting member 4 to form an annular boss structure, in which case the vibrator assembly 3 is provided with an annular limiting boss 3252 corresponding to the annular limiting boss 41.
In an embodiment, the limiting member 4 may also be a cylinder, and the limiting boss 41 is protruded on the periphery of the limiting member 4 and disposed around the periphery of the limiting member 4. It will be appreciated that the stop boss 41 and stop block 3252 may be a continuous ring structure, or a plurality of stop structures may be spaced apart. In the vibration direction of the vibrator component 1, the projections of the limiting boss 41 and the limiting blocking table 3252 are at least partially overlapped to achieve the limiting effect of the vibrator component 1 in the vibration direction, and avoid that the vibrator component 1 vibrates greatly to fall off or pulls to damage the elastic element 2 when the exciter 100 is impacted or falls off.
It will be appreciated that the spacing boss 41 is spaced the same distance from the spacing stop 3252. Optionally, the horizontal gap between the limiting boss 41 and the hole wall of the limiting hole 322 is the same as the horizontal gap between the limiting stop 3252 and the outer wall of the limiting member 4.
In the present embodiment, in the direction 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 larger than the distance between the stopper 4 and the vibrator assembly 3. It is to be understood that the distance between the stopper 4 and the vibrator assembly 3 may be the distance from the stopper boss 41 to the magnetic circuit of the vibrator assembly 3 or the distance from the stopper boss 3252 to the stopper 4. So utilize locating part 4 to produce limiting displacement to the vibration of vibrator subassembly 3, so when falling or colliding appear in exciter 100 or electronic equipment, utilize locating part 4 to produce the location to vibrator subassembly 3 to effectively avoid vibrator subassembly to produce vibration by a wide margin, drag damage elastic component 2, promote the reliability of 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 surround 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 away from the back plate 12 is suspended in the magnetic gap 321.
In the present embodiment, as shown in fig. 2 to fig. 5, the outer frame 11 may be a frame body or a frame structure, that is, the outer frame 11 has a structure with two open ends and a cavity inside. The outer frame 11 serves to support, mount and fix 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 from the support 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 sound cavity 5.
It can be understood that, vibrator subassembly 3 is equipped with magnetic gap 321 towards one side of sound chamber 5, voice coil 13 is located sound chamber 5, voice coil 13's one end is connected with backplate 12, the other end hangs and locates in magnetic gap 321, so let in alternating current signal in to voice coil 13, make voice coil 13 introduce alternating current signal in magnetic gap 321, make vibrator subassembly 3 receive the electromagnetic force effect and make vibrator subassembly 3 take place the vibration, and then transmit stator module 1 and then to the screen with vibrator subassembly 3's inertial force, make the screen resonance sound production.
In the present embodiment, the voice coil 13 is a multi-turn coil formed by winding a conducting wire, and the back plate 12 plays a role of supporting and fixing the voice coil 13 and is used for being fixedly connected with a screen of an electronic device. It can be understood that alternating current signals are respectively conducted to the voice coil 13 and the piezoelectric ceramic plate 6, and the conduction of current signals can be selectively controlled according to application scenes of the electronic equipment.
Optionally, the back plate 12 is a flat plate structure. It is understood that, in order to achieve the limit of the limit 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 limit member 4 and the vibrator assembly 3. The horizontal distance between the limiting boss 41 and the magnetic circuit system 32 may be, or the horizontal distance between the limiting stop 3252 of the magnetic circuit system 32 and the limiting member 4 may be.
It is understood that the material of the back plate 12 can be selected from a metal material, a polymer material, a fiber composite material or a ceramic material. In the present embodiment, the thickness of the back plate 12 is 0.05mm to 0.5mm. Optionally, 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 one embodiment, the back plate 12 is provided with a hollow hole 121 communicating with the acoustic cavity 5, and the hollow hole 121 is located inside or/and outside the voice coil 13. It can be understood that the purpose of reducing weight is achieved by providing the back plate 12 with hollow areas such as the hollow holes 121, so as to improve the high-frequency sound output of the screen. Optionally, the area of the hollowed-out holes 121 does not exceed 50% of the total area of the back-plate 12.
In the present embodiment, the hollow holes 121 may be circular holes, elliptical holes, strip-shaped holes, kidney-shaped holes, polygonal holes, or special-shaped holes, which are not limited herein. Optionally, the plurality of hollow holes 121 include a plurality of hollow holes 121, and the plurality of hollow holes 121 are arranged at intervals. Of course, in other embodiments, one end of each of the plurality of hollow holes 121 may also be connected to form a shape of a different pattern, which is not limited herein. As can be appreciated, the hollowed-out hole 121 is located inside the voice coil 13; or, the hollow hole 121 is located outside the voice coil 13; alternatively, the hollow hole 121 is located inside and outside the voice coil 13, and is not limited herein. Optionally, the material of the back plate 12 is metallic aluminum.
In an embodiment, the vibrator component 3 includes an inner frame 31 and a magnetic circuit system 32, wherein the inner frame 31 is connected to the elastic element 2, the magnetic circuit system 32 includes a first magnetic conductive plate 323, a magnet 324 and a second magnetic conductive plate 325, a periphery of the first magnetic conductive plate 323 is connected to a side of the inner frame 31 opposite to the elastic element 2, the magnet 324 is disposed on a side of the first magnetic conductive plate 323 facing the acoustic cavity 5, the second magnetic conductive plate 325 is disposed on a 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 the present embodiment, as shown in fig. 2, fig. 3 and fig. 7, the inner frame 31 may be selected as 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 system 32. It can be understood that the inner frame 31 is disposed at the periphery of the magnetic circuit system 32 and suspended on the supporting portion 111 at the end of the outer frame 11 away from the back plate 12 by the elastic member 2.
It will be appreciated that magnetic circuit 32 is provided with a magnetic gap 321 to facilitate providing a clearance and suspension space for voice coil 13 so that voice coil 13 can introduce an ac signal into the magnetic field of magnetic circuit 32 to convert the electrical signal into mechanical vibrations of magnetic circuit 32. In this embodiment, the magnetic gap 321 is located outside the limiting hole 322 by providing the magnetic circuit system 32 with the limiting hole 322, so that the limiting effect of the limiting piece 4 and the limiting hole 322 in the horizontal direction and the vertical direction on the magnetic circuit system 32 is conveniently achieved, when the exciter 100 or the electronic device falls or collides, the limiting piece 4 is used for limiting the vibrator assembly 3, thereby effectively preventing the vibrator assembly 3 from vibrating and pulling to damage the elastic piece 2 by a large amplitude, and further improving the reliability of the exciter 100.
In the present embodiment, as shown in fig. 2, fig. 3 and fig. 8, the magnetic circuit system 32 includes a first magnetic conductive plate 323, a magnet 324 and a second magnetic conductive plate 325, the magnetic circuit system 32 is connected and fixed to the inner frame 31 through the first magnetic conductive plate 323, and the magnet 324 and the second magnetic conductive plate 325 are stacked on one side of the first magnetic conductive plate 323 facing the back plate 12. Optionally, the magnet 324 is a permanent magnet. It is understood that the limiting hole 322 is sequentially disposed through the first magnetic conductive plate 323, the magnet 324 and the second magnetic conductive plate 325.
In an embodiment, as shown in fig. 2, fig. 3, and fig. 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 is 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 clamped between the bottom plate 3231 and the second magnetic conductive plate 325, the magnet 324, the second magnetic conductive plate 325, and the side plate 3232 form a magnetic gap 321 at an interval, 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 communicated to form a limiting hole 322.
In this embodiment, the bottom plate 3231 of the first magnetic conductive plate 323 has a first through hole 3233 corresponding to the limiting member 4, the magnet 324 has a second through hole 3241 corresponding to the first through hole 3233, and the second magnetic conductive plate 325 has a third through hole 3251 corresponding to the second through hole 3241, such that the first through hole 3233, the second through hole 3241, and the third through hole 3251 are sequentially connected to form a limiting hole 322.
It is understood that the first magnetic conductive plate 323, the magnet 324 and the second magnetic conductive plate 325 may be selected to have a ring structure, such that the first magnetic conductive plate 323, the magnet 324 and the second magnetic conductive plate 325 form the limiting hole 322. Of course, in other embodiments, the magnets 324 and the second magnetic conductive plates 325 each 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 hole 3233, which is not limited herein.
In this embodiment, the first magnetic conducting plate 323 includes a bottom plate 3231 and a side plate 3232 disposed at an included angle, the magnet 324 and the second magnetic conducting plate 325 are stacked on a side of the bottom plate 3231 facing the back plate 12, and the magnet 324, the second magnetic conducting plate 325 and the side plate 3232 form a magnetic gap 321 at an interval.
In one embodiment, as shown in fig. 2, 3, 7 and 8, a limit step 3234 is formed on a periphery of a side of the bottom plate 3231 facing away from the magnet 324, the limit step 3234 is disposed around the first through hole 3233, the inner frame 31 is provided with a support platform 311, and the support platform 311 supports and limits the limit step 3234. It can be appreciated that the limiting step 3234 is a step structure, and the supporting platform 311 supports and overlaps the limiting step 3234. Alternatively, the support table 311 and the limit step 3234 may be connected by gluing, welding, or the like, which is not limited herein.
In one embodiment, as shown in fig. 2, 3, 7 and 8, one of the side plates 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 received and retained in the positioning groove 312. It is understood that the side plates 3232 are provided with positioning protrusions 3235, the inner frame 31 is provided with positioning grooves 312 on the inner wall thereof, and the positioning protrusions 3235 are received and retained in the positioning grooves 312. Of course, the side plates 3232 are provided with the positioning grooves 312, and the inner wall of the inner frame 31 is provided with the positioning protrusions 3235, which is not limited herein.
In the present embodiment, the positioning projection 3235 and the positioning groove 312 may be a ring structure. Of course, the positioning protrusion 3235 and the positioning groove 312 each include a plurality of protrusions, and the plurality of positioning protrusions 3235 and the plurality of positioning grooves 312 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 protrusion 313, and the other one of the inner frame and the elastic member is provided with a fixing groove 22, and the fixing protrusion 313 is received and retained in the fixing groove 22. It can be understood that the inner frame 31 is provided at the periphery thereof with fixing bosses 313, the inner wall of the elastic member 2 is provided with fixing grooves 22, and the fixing bosses 313 are received and retained in the fixing grooves 22. Of course, the inner frame 31 is provided at the periphery thereof with the fixing grooves 22, and the inner wall of the elastic member 2 is provided with the fixing bosses 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 third through hole 3251 to form a limiting stop 3252, 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 limit stop 3252 are integrally formed. In this embodiment, the second magnetic conductive plate 325 and the limit stop 3252 are located on the same plane. It can be understood that, in order to ensure the structure and the processing convenience of the second magnetic conducting plate 325, the wall of the limiting stop 3252 and the wall of the third through hole 3251 are in smooth transition.
In one embodiment, the limiting member 4 is provided with a weight-reduced area. By adjusting the weight of the stopper 4, the vibration characteristics of the back plate 12 are adjusted. The weight-reducing area can be a weight-reducing groove 44 concavely arranged on the periphery of the limiting member 4; and/or the weight-reducing area is a weight-reducing hole 45 arranged in the middle of the limiting piece 4.
In this embodiment, the weight-reducing region is disposed on the limiting member 4, for example, a hollow-out region is disposed around or in the center of the limiting member 4, so as to achieve the purpose of reducing weight, and further improve the vibration performance of the exciter 100, and further improve the sound-producing performance of the electronic device.
In one embodiment, as shown in fig. 11, the weight-reducing region is a weight-reducing groove 44 recessed at the periphery of the limiting member 4. It will be appreciated that the lightening slot 44 is formed by the recess of the outer wall of the retaining member 4. Alternatively, the weight-reduction grooves 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, without being limited thereto.
In the present embodiment, the lightening grooves 44 include a plurality of lightening grooves 44, and the plurality of lightening grooves 44 are circumferentially arranged along the outer wall of the limiting member 4 at intervals.
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 can be selected as through holes or through groove structures, namely the lightening holes 45 are arranged through the limiting member 4. Optionally, the lightening holes 45 include a plurality of lightening holes 45, and the plurality of lightening holes 45 are arranged at intervals.
In one embodiment, the elastic member 2 has a folded ring portion 21; the bending ring part 21 is formed by the way that one side of the elastic part 2 back to the sound cavity 5 is sunken towards the sound cavity 5; or, the bending ring part 21 is formed by the protrusion of one side of the elastic part 2 back to the acoustic cavity 5 and the other side away from the acoustic cavity 5; alternatively, the hinge portion 21 has a plurality of protrusions and a plurality of recesses that are continuously transitioned.
In the present embodiment, as shown in fig. 2, 3 and 6, the folded ring part 21 is provided on the elastic member 2, so that the folded ring part 21 of the elastic member 2 plays an elastic buffering role for the vibration of the vibrator component 3, thereby playing an auxiliary limit role. It can be understood that the folded ring part 21 may be a protrusion or a groove structure, that is, the folded ring part 21 is a protrusion structure formed by protruding one side of the elastic member 2 away from the acoustic cavity 5 toward one side away from the acoustic cavity 5; alternatively, the bending ring portion 21 is a groove structure formed by recessing the side of the elastic member 2 away from the acoustic cavity 5 toward the acoustic cavity 5, and is not limited herein.
Alternatively, the elastic member 2 has a plurality of protrusions and a plurality of depressions in a continuous transition, i.e., the elastic member 2 has a wave shape.
Optionally, the elastic member 2 is made of a super-elastic material, and the super-elastic material is one of silicone rubber, fluorosilicone rubber, NBR, TPU, and TPE. It can be understood that the material of the elastic element 2 is a superelastic material, and the material of the elastic element 2 is selected to further adjust the compliance of the elastic element 2, so as to adjust the vibration characteristics of the backplate 12 and effectively improve 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, one side of the elastic member 2 away from the acoustic cavity 5 may further be convexly provided with a limiting structure, 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. Set up limit structure on elastic component 2 for exciter 100 keeps away from the supplementary spacing in the space of screen one side, avoids vibrator subassembly 1 vibration amplitude too big time touching electronic equipment's casing or other parts, influences vibration effect or damages the casing etc..
Compared with the existing moving magnet exciter, as shown in fig. 13, the exciter 100 of the present invention arranges the piezoelectric ceramic plate 6 outside the acoustic cavity 5, and connects with the second end of the limiting member 4 penetrating through the limiting hole 322 and extending out of the acoustic cavity 5, and utilizes the inverse piezoelectric effect of the piezoelectric ceramic plate 6, that is, when the exciter is powered on, the piezoelectric ceramic plate 6 can generate deformation or mechanical stress, so as to excite the screen to vibrate, thereby improving the frequency response performance of the electronic device at medium and high frequencies.
Compared with the conventional piezoelectric actuator, as shown in fig. 14, in the actuator 100 of the present invention, the piezoelectric ceramic plate 6 is disposed outside the acoustic cavity 5, and is connected to the second end of the limiting member 4, which passes through the limiting hole 322 and extends out of the acoustic cavity 5, so that the elastic member 2 is used to provide a flexible support for the vibrator assembly 3, thereby reducing the offset of the vibrator assembly 3 in the non-vibration direction, stabilizing the vibration mode of the vibrator assembly 3, and providing stable output excitation for the actuator 100, thereby improving the low-frequency performance of the electronic device.
The present invention further provides an electronic device, which includes a housing, a screen and the above-mentioned exciter 100, and the specific structure of the exciter 100 refers to the foregoing embodiments, and since the electronic device adopts all the technical solutions of all the foregoing embodiments, at least all the beneficial effects brought by the technical solutions of the foregoing embodiments are provided, and details are not repeated 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 above description is only an alternative embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, which are within the spirit of the present invention, are included in the scope of the present invention.
Claims (14)
1. An actuator, comprising:
a stator assembly provided with a support part;
the elastic piece is connected to the supporting part;
the vibrator assembly is suspended on the supporting part through the elastic piece, the vibrator assembly, the elastic piece and the stator assembly enclose to form a sound cavity, and the vibrator assembly is provided with a limiting hole communicated with the sound cavity;
a first end of the limiting piece is connected with the stator assembly, a second end of the limiting piece penetrates through the limiting hole and extends out of the sound cavity, and the limiting piece is spaced from the hole wall of the limiting hole; and
a piezoelectric ceramic plate, the piezoelectric ceramic plate is located outside the acoustic cavity, and connect in the second end of locating part.
2. The actuator according to claim 1, wherein said plate is provided with a mounting hole, and a second end of said stopper is inserted into said mounting hole.
3. The actuator according to claim 2, wherein the outer wall of the retaining member is recessed with a retaining groove corresponding to the piezoelectric ceramic plate, and the wall of the mounting hole is received and retained in the retaining groove.
4. An actuator according to claim 3, wherein the mounting hole is located at 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 according to claim 1, wherein said piezoelectric ceramic plate is made of a piezoelectric ceramic material, and said piezoelectric ceramic material comprises PZT, lead meta-niobate, pbTiO 3 、BaTiO 3 Or BNT;
and/or the thickness of the piezoelectric ceramic plate is 0.1 mm-0.5 mm.
6. The exciter according to claim 1, wherein one end of the limiting member, which is far away from the stator assembly, is provided with a limiting boss, and the piezoelectric ceramic plate is connected to the outer wall of the limiting boss;
the vibrator component is provided with a limiting baffle table corresponding to the limiting boss, and the limiting baffle table extends towards the limiting hole and is positioned between the limiting boss and the stator component; and/or projections of the limiting boss and the limiting baffle table in the vibration direction of the vibrator assembly are at least partially overlapped.
7. The actuator of claim 6, wherein said limiter 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 edges; or the limit bosses are convexly arranged on the two short shaft edges; or, the limit boss is convexly arranged on the long shaft side and the short shaft side and is arranged around the periphery of the limit piece;
or, the limiting part is cylindrical, and the limiting boss is convexly arranged on the periphery of the limiting part and is arranged around the periphery of the limiting part.
8. The exciter of 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 part is connected with the back plate, and the vibrator component is suspended on the supporting part through the elastic part and is opposite to and spaced from the back plate, so that the back plate, the outer frame, the elastic part and the vibrator component are surrounded to form the sound cavity; and
the voice coil is arranged on one side, facing the vibrator assembly, of the back plate and surrounds the limiting part, and one end, far away from the back plate, of the voice coil is suspended in the magnetic gap.
9. An actuator according to claim 8, wherein the backplate is of flat plate construction;
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 back plate is 0.05 mm-0.5 mm;
and/or the back plate is provided with a hollow hole communicated with the sound cavity, and the hollow hole is positioned on the inner side or/and the outer side of the voice coil;
and/or the back plate is provided with a hollow hole communicated with the sound cavity, and the area of the hollow hole is not more than 50% of the total area of the back plate;
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 the vibrator assembly comprises:
the inner frame is connected with the elastic piece; 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 the back of the inner frame to one side of the elastic part, the magnet is arranged on one side, facing the sound cavity, of the first magnetic conduction plate, the second magnetic conduction plate is arranged on one side, facing the sound cavity, of the magnet, and the limiting holes sequentially penetrate through the first magnetic conduction plate, the magnet and the second magnetic conduction plate.
11. The exciter according to claim 10, wherein the first magnetic conductive plate comprises a bottom plate and a side plate arranged at an included angle, the bottom plate and/or the side plate is connected to the inner frame, the bottom plate is provided with a first through hole corresponding to the limiting member, the magnet is sandwiched between the bottom plate and a second magnetic conductive plate, the magnet and the second magnetic conductive plate form a magnetic gap with the side plate at an interval, the magnet is provided with a second through hole corresponding to the first through hole, the second magnetic conductive 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 to form the limiting hole.
12. The exciter according to claim 11, wherein the periphery of the bottom plate on the side facing away from the magnet is formed with a limiting step, the limiting step is disposed around the first through hole, the inner frame is provided with a support platform, and the support platform is supported and limited on the limiting step;
and/or, one of the inner walls of the side plates and the inner frame is provided with a positioning bulge, the other one of the inner walls of the side plates and the inner frame is provided with a positioning groove, and the positioning bulge is accommodated and limited in the positioning groove;
and/or, one of the inner frame and the elastic piece is provided with a fixing boss, the other one of the inner frame and the elastic piece is provided with a fixing groove, and the fixing boss is accommodated and limited in the fixing groove;
and/or one side of the second magnetic conduction plate, which is adjacent to the third through hole, extends towards the inside of the third through hole to form a limiting stop table, a limiting boss is arranged at one end, which is far away from the stator assembly, of the limiting part, and the limiting stop table is positioned between the limiting boss and the stator assembly.
13. An actuator according to claim 1, wherein the restraining member is provided with a weight-reducing region; the weight reduction area is a weight reduction groove concavely arranged on the periphery of the limiting piece; and/or the weight reduction area is a weight reduction hole arranged in the middle of the limiting part;
and/or the elastic piece is provided with a folded ring part; the folded ring part is formed by sinking one side of the elastic part back to the sound cavity towards the sound cavity; or the folded ring part is formed by the protrusion of one side of the elastic part, which is back to the sound cavity, towards one side which is away from the sound 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 elastomer material, and the super elastomer material is one of silicon rubber, fluorosilicone rubber, NBR, TPU and 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 50Hz to 1000Hz.
14. An electronic device comprising a housing, a screen and an actuator according to any of claims 1 to 13, wherein the screen is connected to the housing and encloses a cavity with the housing, the actuator is disposed in the cavity, and a stator assembly of the actuator is connected to the screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211110316.7A CN115334422A (en) | 2022-09-13 | 2022-09-13 | Exciter and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211110316.7A CN115334422A (en) | 2022-09-13 | 2022-09-13 | Exciter and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115334422A true CN115334422A (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211110316.7A Pending CN115334422A (en) | 2022-09-13 | 2022-09-13 | Exciter and electronic device |
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