Actuators and electronics

Abstract

The present invention discloses an exciter and an electronic device, wherein the exciter comprises a stator assembly, an elastic member, a vibrator assembly and a limit assembly, wherein the stator assembly is provided with a support portion, the elastic member is connected to the support portion, the vibrator assembly comprises an external magnetic circuit portion, the external magnetic circuit portion is suspended on the support portion through the elastic member, and the external magnetic circuit portion, the elastic member and the stator assembly enclose a sound cavity, the external magnetic circuit portion is provided with a limit hole connected to the sound cavity, the limit assembly comprises an inner magnetic circuit portion and an inner voice coil arranged around the inner magnetic circuit portion, one end of the limit assembly is connected to the stator assembly, and the other end is penetrated in the limit hole and spaced from the hole wall of the limit hole. The present invention aims to provide an exciter with high effective reliability and good excitation performance.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic conversion, and in particular to an exciter and an electronic device using the exciter. Background Art

[0002] In order to realize the conversion of electronic equipment electrical signals into acoustic signals, common transducer devices include dynamic speakers, moving iron speakers, piezoelectric speakers, capacitive speakers, etc., all of which work on the principle of converting electrical signals into mechanical vibrations, thereby driving the air to make sounds. Flat panel sound generation is to excite the hard plate to produce various resonant modes, and the plate achieves sound radiation in the form of near random vibration. For electronic equipment, its own planar structure, such as the screen, housing, etc., provides feasible conditions for this sound generation method. In order to excite the resonant mode of the flat panel, a device that can provide excitation is necessary.

[0003] In the related art, the excitation device is usually unable to provide stable force output to the tablet, and lacks positioning during the force output process. When it falls or collides, friction occurs between the components, thereby affecting the vibration effect and further affecting the sound performance of the electronic device. Summary of the invention

[0004] The main purpose of the present invention is to provide an exciter with high reliability and good excitation performance, which can improve the sound performance of electronic equipment when applied to electronic equipment.

[0005] To achieve the above object, the present invention provides an exciter, the exciter comprising:

[0006] A stator assembly, wherein the stator assembly is provided with a support portion;

[0007] an elastic member, the elastic member being connected to the supporting portion;

[0008] A vibrator assembly, the vibrator assembly comprising an external magnetic circuit portion, the external magnetic circuit portion being suspended on the support portion through the elastic member, the external magnetic circuit portion, the elastic member and the stator assembly forming a sound cavity, the external magnetic circuit portion being provided with a limiting hole communicating with the sound cavity; and

[0009] A limit assembly, the limit assembly includes an inner magnetic circuit portion and an inner voice coil arranged around the inner magnetic circuit portion, one end of the limit assembly is connected to the stator assembly, and the other end is passed through the limit hole and spaced from the hole wall of the limit hole.

[0010] In one embodiment, a limiting boss is provided at one end of the inner magnetic circuit portion away from the stator assembly, and a limiting stop is provided at the outer magnetic circuit portion corresponding to the limiting boss;

[0011] The limit stop extends toward the limit hole and is located between the limit boss and the stator assembly and / or the projections of the limit boss and the limit stop in the vibration direction of the vibrator assembly at least partially overlap.

[0012] In one embodiment, the inner magnetic circuit portion has two long axis sides and two short axis sides connected end to end; the limiting boss is convexly provided on the two long axis sides; or, the limiting boss is convexly provided on the two short axis sides; or, the limiting boss is convexly provided on the long axis side and the short axis side, and is arranged around the periphery of the inner magnetic circuit portion;

[0013] Alternatively, the inner magnetic circuit portion is cylindrical, and the limiting boss is protruding from the periphery of the inner magnetic circuit portion and is arranged around the periphery of the inner magnetic circuit portion.

[0014] In one embodiment, the inner magnetic circuit portion includes an inner magnetic yoke, an inner magnet and an inner magnetic plate which are stacked in sequence, the inner magnetic plate is connected to the stator assembly, the inner magnet is clamped between the inner magnetic plate and the inner magnetic yoke, and the inner magnetic yoke extends toward the outer magnetic circuit portion to form the limiting boss.

[0015] In one embodiment, the outer diameter of the inner magnet is the same as that of the inner magnetic conductive plate and is smaller than the outer diameter of the inner magnetic conductive yoke;

[0016] And / or, the inner magnetic yoke, the inner magnet and the inner magnetic plate are all arranged in a ring shape, so that a hollow area is formed in the middle of the inner magnetic yoke, the inner magnet and the inner magnetic plate; or, the inner magnetic yoke is arranged in a ring shape, so that a hollow area is formed in the middle of the inner magnetic yoke, the inner magnet and the inner magnetic plate each include a plurality of inner magnetic plates, the plurality of inner magnetic plates are respectively stacked on the plurality of inner magnets, the plurality of inner magnets are arranged at intervals, and are arranged around the hollow area.

[0017] In one embodiment, the vibrator assembly further includes an inner frame, the inner side of the inner frame is connected to the periphery of the outer magnetic circuit portion, and the outer side of the inner frame is connected to the elastic member, so that the inner frame and the outer magnetic circuit portion are suspended on the support portion through the elastic member.

[0018] In one embodiment, the outer magnetic circuit portion comprises:

[0019] An outer magnetic yoke, the outer magnetic yoke comprising a bottom plate and a side plate arranged at an angle, the bottom plate and / or the side plate are connected to the inner frame, and the bottom plate is provided with a first through hole;

[0020] an external magnet, the external magnet being disposed on a side of the bottom plate facing the acoustic cavity and spaced apart from the side plate, the external magnet being provided with a second through hole corresponding to the first through hole; and

[0021] An outer magnetic conductive plate is arranged on the side of the outer magnet facing away from the bottom plate and is spaced from the side plate. The outer magnetic conductive plate is provided with a third through hole corresponding to the second through hole. The first through hole, the second through hole and the third through hole are connected in sequence to form the limiting hole.

[0022] In one embodiment, a limiting step is formed on the periphery of the bottom plate facing away from the outer magnet, the limiting step is arranged around the first through hole, the inner frame is provided with a support platform, and the support platform is limited to the limiting step;

[0023] And / or, one of the side plate and the inner wall of the inner frame is provided with a positioning protrusion, and the other is provided with a positioning groove, and the positioning protrusion is accommodated and limited in the positioning groove;

[0024] And / or, one of the inner frame and the elastic member is provided with a fixing boss, and the other of the inner frame and the elastic member is provided with a fixing groove, and the fixing boss is accommodated and limited in the fixing groove;

[0025] And / or, a side of the outer magnetic conductive plate adjacent to the third through hole extends toward the third through hole to form a limit stop, and an end of the inner magnetic circuit portion away from the stator assembly is provided with a limit boss, and the limit stop is located between the limit boss and the stator assembly; and / or, the projections of the limit boss and the limit stop in the vibration direction of the vibrator assembly at least partially overlap.

[0026] In one embodiment, the inner magnetic circuit portion and the outer magnetic circuit portion are spaced apart to form an inner magnetic gap, and the inner voice coil is disposed in the inner magnetic gap; and the stator assembly comprises:

[0027] Frame; and

[0028] A back plate, the back plate is connected to one end of the outer frame so that the other end of the outer frame forms the support portion, one end of the inner magnetic circuit portion is connected to the back plate, the outer magnetic circuit portion is suspended from the support portion through the elastic member, and the back plate, the outer frame, the elastic member and the outer magnetic circuit portion enclose the acoustic cavity;

[0029] Wherein, the inner voice coil is arranged on a side of the back plate facing the outer magnetic circuit part, and the inner voice coil is adhered and fixed to the inner magnetic circuit part.

[0030] In one embodiment, an external magnetic gap is further provided on a side of the external magnetic circuit portion facing the acoustic cavity, and the external magnetic gap is located outside the internal magnetic gap and is arranged around the internal magnetic gap;

[0031] The stator assembly also includes an outer voice coil, which is arranged around the inner voice coil and is located between the outer frame and the inner voice coil. One end of the outer voice coil is suspended in the outer magnetic gap.

[0032] In one embodiment, the back plate is a flat plate structure;

[0033] And / or, the material of the back plate is metal material, polymer material, fiber composite material or ceramic material; or, the material of the back plate is piezoelectric ceramic material, and the piezoelectric ceramic material includes PZT, lead metaniobate, PbTiO 3 、BaTiO 3 , one of BNT;

[0034] And / or, the thickness of the back plate is 0.05 mm to 0.5 mm;

[0035] And / or, the back plate is provided with a hollow hole connected to the sound cavity, and the hollow hole is located on the inner side and / or the outer side of the outer voice coil;

[0036] And / or, the back plate is provided with a hollow hole connected to the sound cavity, and the area of ​​the hollow hole does not exceed 50% of the total area of ​​the back plate;

[0037] And / or, the current directions of the inner voice coil and the outer voice coil are opposite.

[0038] In one embodiment, the elastic member has a folded ring portion;

[0039] The folding ring portion is formed by a side of the elastic member facing away from the sound cavity being concave toward the sound cavity; or, the folding ring portion is formed by a side of the elastic member facing away from the sound cavity being convex toward the side facing away from the sound cavity; or, the folding ring portion has a plurality of convex portions and a plurality of concave portions with continuous transition.

[0040] In one embodiment, the elastic member is made of a superelastic material, and the superelastic material is one of silicone rubber, NBR, TPU, and TPE;

[0041] And / or, the stiffness coefficient of the elastic member is 5N / m~50N / m;

[0042] And / or, the inner magnetic circuit portion and the outer magnetic circuit portion are both magnetized in a vertical direction, and the magnetization directions of the inner magnetic circuit portion and the outer magnetic circuit portion are opposite;

[0043] And / or, the resonant frequency of the exciter is 50 Hz~1000 Hz.

[0044] The present invention also proposes an electronic device, comprising a casing, a screen and the above-mentioned exciter, wherein the screen is connected to the casing and encloses the casing to form a cavity, the exciter is arranged in the cavity, and the stator assembly of the exciter is connected to the screen.

[0045] The exciter of the technical solution of the present invention includes a stator assembly, a vibrator assembly and a limit assembly. The stator assembly is connected to a plane such as a screen of an electronic device, and the vibrator assembly is suspended by setting an elastic member to improve the vibration effect of the vibrator assembly. At the same time, the vibrator assembly is provided with a limit hole connected to the sound cavity, and the limit assembly is arranged in the limit hole and spaced from the hole wall of the limit hole, so that the limit assembly is used to limit the vibration of the vibrator assembly. In this way, when the exciter or the electronic device falls or collides, the phenomenon of the vibrator assembly vibrating greatly and pulling and damaging the elastic member is effectively avoided, thereby improving the reliability of the exciter. Furthermore, the vibrator assembly includes an external magnetic circuit part, and the limit assembly includes an internal magnetic circuit part. The internal magnetic circuit part cooperates with the external magnetic circuit part to improve the magnetic field strength, thereby improving the output excitation of the exciter to the electronic device, so as to improve the sound performance of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0047] Figure 1 A schematic diagram of the structure of an exciter in one embodiment of the present invention;

[0048] Figure 2 is an exploded schematic diagram of an exciter in one embodiment of the present invention;

[0049] Figure 3 A cross-sectional schematic diagram of an exciter in one embodiment of the present invention;

[0050] Figure 4 A schematic diagram of the structure of a backplane in one embodiment of the present invention;

[0051] Figure 5 A schematic diagram of the structure of a backplane in another embodiment of the present invention;

[0052] Figure 6 It is a schematic structural diagram of an elastic member in one embodiment of the present invention;

[0053] Figure 7 This is a schematic diagram of the structure of an inner frame in one embodiment of the present invention;

[0054] Figure 8 This is a schematic structural diagram of a first magnetic conductive plate in one embodiment of the present invention;

[0055] Fig. 9 is a performance comparison diagram of the exciter of the present invention and the prior art;

[0056] Fig.10 This is a performance comparison diagram of the back plate of the actuator of the present invention made of piezoelectric ceramic material and the back plate made of ordinary material.

[0057] Description of Figure Numbers:

[0058]

[0059] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0062] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0063] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0064] In order to realize the conversion of electronic equipment electrical signals into acoustic signals, common transducer devices include dynamic speakers, moving iron speakers, piezoelectric speakers, capacitive speakers, etc., all of which work on the principle of converting electrical signals into mechanical vibrations, thereby driving the air to make sounds. Flat panel sound generation is to excite the hard plate to produce various resonant modes, and the plate achieves sound radiation in the form of near random vibration. For electronic equipment, its own planar structure, such as the screen, housing, etc., provides feasible conditions for this sound generation method. In order to excite the resonant mode of the flat panel, a device that can provide excitation is necessary.

[0065] Based on the above ideas and problems, the present invention proposes an exciter 100. It can be understood that the exciter 100 is applied to an electronic device, and the electronic device has a flat structure, such as a screen, a housing, etc. By connecting the exciter 100 with the flat structure of the electronic device, such as a screen, the exciter 100 is used to excite the screen to produce various resonant modes, and the screen realizes sound radiation in a form close to random vibration.

[0066] Please refer to Figures 1 to 8 As shown, in an embodiment of the present invention, the exciter 100 includes a stator assembly 1, an elastic member 2, a vibrator assembly 3 and a limit assembly 4, wherein the stator assembly 1 is provided with a support portion 111, the elastic member 2 is connected to the support portion 111, the vibrator assembly 3 includes an external magnetic circuit portion 33, the external magnetic circuit portion 33 is suspended on the support portion 111 through the elastic member 2, and the external magnetic circuit portion 33, the elastic member 2 and the stator assembly 1 enclose a sound cavity 5, the external magnetic circuit portion 33 is provided with a limit hole 331 connected to the sound cavity 5, the limit assembly 4 includes an inner magnetic circuit portion 41 and an inner voice coil 42 arranged around the inner magnetic circuit portion 41, one end of the limit assembly 4 is connected to the stator assembly 1, and the other end is penetrated into the limit hole 331 and is spaced from the hole wall of the limit hole 331.

[0067] In this embodiment, the stator component 1 of the exciter 100 is used to connect to a flat structure such as a screen of an electronic device, and the vibrator component 3 is used to cooperate with the stator component 1 to generate vibration. The stator component 1 resonates under the vibration of the outer magnetic circuit part 33 of the vibrator component 3, thereby exciting the screen to produce various resonant modes, so that the screen can achieve sound radiation in a form close to random vibration. In this embodiment, the exciter 100 can provide a stable output excitation to the screen, and has a lower resonant frequency to match the low-order vibration of the screen, and has a strong mechanical strength to meet the use of electronic equipment.

[0068] In this embodiment, by providing a support portion 111 on the stator assembly 1, the support portion 111 is used to support and install the vibrator assembly 3. It can be understood that the support portion 111 can be a structure such as a support column, a frame or a bracket, and by providing an elastic member 2, the outer magnetic circuit portion 33 of the vibrator assembly 3 is suspended on the support portion 111 through the elastic member 2, so that the outer magnetic circuit portion 33, the elastic member 2 and the stator assembly 1 enclose a sound cavity 5, so that when the stator assembly 1 and the outer magnetic circuit portion 33 cooperate, the outer magnetic circuit portion 33 vibrates and drives the stator assembly 1 to resonate.

[0069] It can be understood that the elastic member 2 connects the vibrator assembly 3 and the stator assembly 1 to provide flexible support for the vibrator assembly 3. During the vibration of the vibrator assembly 3, the elastic member 2 undergoes elastic deformation to provide appropriate compliance for the exciter 100. In addition, through the connection between the elastic member 2 and 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 a stable force output.

[0070] In this embodiment, a limiting hole 331 connected to the acoustic cavity 5 is provided on the outer magnetic circuit portion 33, and a limiting component 4 is provided, so that one end of the limiting component 4 is located in the acoustic cavity 5 and connected to the stator component 1, and the other end of the limiting component 4 is passed through the limiting hole 331 and is spaced from the hole wall of the limiting hole 331. Therefore, when the exciter 100 or the electronic device falls or collides, the inner magnetic circuit portion 41 of the limiting component 4 is used to limit the outer magnetic circuit portion 33, thereby effectively preventing the vibrator component 3 from vibrating greatly and pulling and damaging the elastic member 2, thereby improving the reliability of the exciter 100.

[0071] It can be understood that by setting the magnetic circuit system of the vibrator component 3 as the external magnetic circuit part 33, the external magnetic circuit part 33 is suspended on the support part 111 through the elastic member 2, and the elastic member 2 provides flexible support for the vibrator component 3, thereby reducing the displacement of the vibrator component 3 in the non-vibration direction, stabilizing the vibration form of the vibrator component 3, and enabling the exciter 100 to provide a stable force output; at the same time, a limit component 4 is provided, and the limit component 4 is provided as the internal magnetic circuit part 41 and the inner voice coil 42, so that the internal magnetic circuit part 41 is fixedly connected to the stator component 1, and one end of the internal magnetic circuit part 41 is passed through the limit hole 331, on the one hand, the internal magnetic circuit part 41 realizes the limiting function of the outer magnetic circuit part 33. On the other hand, the inner magnetic circuit part 41 and the outer magnetic circuit part 33 cooperate to form a stronger magnetic field. In this way, an AC signal is passed through the voice coil, so that the voice coil introduces the electrical signal into the magnetic field formed by the inner magnetic circuit part 41 and the outer magnetic circuit part 33. Since the inner magnetic circuit part 41 and the outer magnetic circuit part 33 form a stronger magnetic field, the magnetic field driving force is increased, so that the outer magnetic circuit part 33 of the vibrator assembly 3 is subjected to the electromagnetic force to cause the vibrator assembly 3 to vibrate, 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 makes sound, and the BL value of the electronic device is improved.

[0072] The exciter 100 of the present invention includes a stator assembly 1 and a vibrator assembly 3. The stator assembly 1 is connected to a plane such as a screen of an electronic device, and the vibrator assembly 3 is suspended by an elastic member 2 to improve the vibration effect of the vibrator assembly 3. At the same time, the vibrator assembly 3 is provided with a limiting hole 331 connected to the sound cavity 5, and the limiting assembly 4 is arranged in the limiting hole 331 and is spaced from the hole wall of the limiting hole 331, so that the limiting assembly 4 is used to limit the vibration of the vibrator assembly 3. In this way, when the exciter 100 or the electronic device falls or collides, the phenomenon of the vibrator assembly 3 vibrating greatly and pulling and damaging the elastic member 2 is effectively avoided, thereby improving the reliability of the exciter 100. Further, the vibrator assembly 3 includes an external magnetic circuit part 33, and the limiting assembly 4 includes an internal magnetic circuit part 41. The internal magnetic circuit part 41 cooperates with the external magnetic circuit part 33 to improve the magnetic field strength, thereby improving the output force of the exciter 100 on the electronic device to improve the sound performance of the electronic device.

[0073] It can be understood that the outer magnetic circuit part 33 of the vibrator assembly 3 is arranged opposite and parallel to the stator assembly 1, and the inner magnetic circuit part 41 and the limit hole 331 form a gap in the horizontal direction, which can limit the horizontal movement of the outer magnetic circuit part 33, thereby realizing horizontal limit, so as to avoid the situation where the magnetic circuit of the exciter 100 rubs against the voice coil under a large impact and produces abnormal sound. The total height of the inner magnetic circuit part 41 is adjusted, and when in the balanced position, the magnetic field force of the inner magnetic circuit part 41 on the outer magnetic circuit part 33 in the vertical direction is zero, so as to avoid the magnetic field force interfering with the vibration state of the vibrator assembly 3.

[0074] In one embodiment, if Figure 3 As shown, a limiting boss 414 is provided at one end of the inner magnetic circuit portion 41 away from the stator assembly 1, and a limiting stop 3342 is provided at the outer magnetic circuit portion 33 corresponding to the limiting boss 414, the limiting stop 3342 extends toward the limiting hole 331, and is located between the limiting boss 414 and the stator assembly 1; and / or, the projections of the limiting boss 414 and the limiting stop 3342 in the vibration direction of the vibrator assembly 3 at least partially overlap.

[0075] It can be understood that the limit stop 3342 extends toward the limit hole 331 and is located between the limit boss 414 and the stator assembly 1. The projections of the limit boss 414 and the limit stop 3342 in the vibration direction of the vibrator assembly 3 at least partially overlap. In this way, the limit boss 414 and the limit stop 3342 cooperate with each other to achieve the upper limit of the vibration direction of the vibrator assembly 3, preventing the vibrator assembly 3 from vibrating greatly and pulling and damaging the elastic member 2 when the exciter 100 is subjected to external force or falls, thereby improving the reliability of the exciter 100.

[0076] In this embodiment, a limiting boss 414 is provided at one end of the inner magnetic circuit portion 41 located in the limiting hole 331. At this time, the limiting boss 414 is spaced from the hole wall of the limiting hole 331 to form a gap. The gap can limit the horizontal movement of the outer magnetic circuit portion 33, thereby realizing horizontal limiting. This prevents the exciter 100 from rubbing the magnetic circuit against the voice coil and generating abnormal noise under a large impact.

[0077] It can be understood that by providing a limit stop 3342 on the external magnetic circuit portion 33 extending toward the limit hole 331, the limit stop 3342 corresponds to the limit boss 414 and is located between the limit boss 414 and the stator assembly 1, that is, there is a gap between the limit boss 414 and the limit stop 3342 in the up and down direction or the vertical direction, so that the gap formed by the limit boss 414 and the limit stop 3342 in the up and down direction or the vertical direction is utilized to limit the external magnetic circuit portion 33 in the up and down direction and the vertical direction, so as to prevent the external magnetic circuit portion 33 from vibrating violently and pulling and damaging the elastic part 2 when the exciter 100 is subjected to external force or falls, thereby improving the reliability of the exciter 100.

[0078] In this embodiment, when the exciter 100 is working, the side of the stator component 1 of the exciter 100 facing away from the vibrator component 3 is connected and fixed to the screen of the electronic device. By passing an AC signal through the voice coil 13 of the stator component 1, the voice coil 13 is used to introduce the electrical signal into the strong magnetic field formed by the inner magnetic circuit part 41 and the outer magnetic circuit part 33. The outer magnetic circuit part 33 is acted upon by the electromagnetic force and vibrates. Then, the inertial force of the outer magnetic circuit part 33 is transmitted to the stator component 1 and then to the screen through the elastic member 2, so that the screen resonates and makes sound. Optionally, the resonant frequency of the exciter 100 is between 50Hz and 1000Hz, so that the frequency response curve when the exciter 100 acts alone has a relatively stable mid- and low-frequency output.

[0079] In one embodiment, the inner magnetic circuit portion 41 has two long axis sides and two short axis sides connected end to end; the limiting boss 414 is protruded from the two long axis sides; or, the limiting boss 414 is protruded from the two short axis sides; or, the limiting boss 414 is protruded from the long axis sides and the short axis sides, and is arranged around the periphery of the inner magnetic circuit portion 41.

[0080] In this embodiment, if Figure 1 and Figure 2 As shown, the inner magnetic circuit portion 41 is a square structure, that is, the inner magnetic circuit portion 41 has two long axis sides and two short axis sides connected end to end. It can be understood that the two long axis sides of the inner magnetic circuit portion 41 are opposite, and the two short axis sides of the inner magnetic circuit portion 41 are opposite.

[0081] In one embodiment, the limiting bosses 414 are convexly disposed on the two short axis sides. It can be understood that the limiting bosses 414 of the outer magnetic circuit portion 33 corresponding to the two short axis sides are provided with limiting stoppers 3342 .

[0082] In another embodiment, the limiting bosses 414 are protrudingly provided on two long axis sides. In this case, the limiting bosses 414 on the two long axis sides of the outer magnetic circuit portion 33 are provided with limiting stoppers 3342 .

[0083] In another embodiment, the limiting boss 414 is protruded from the major axis side and the minor axis side, and is arranged around the periphery of the inner magnetic circuit portion 41, that is, the two major axis sides and the two minor axis sides of the inner magnetic circuit portion 41 are each provided with a limiting boss 414, and the limiting boss 414 is arranged around the periphery of the inner magnetic circuit portion 41 to form an annular boss structure. At this time, the outer magnetic circuit portion 33 is provided with an annular limiting stop 3342 corresponding to the annular limiting boss 414.

[0084] In one embodiment, the inner magnetic circuit portion 41 is cylindrical, and the limiting boss 414 is protruding from the periphery of the inner magnetic circuit portion 41 and is arranged around the periphery of the inner magnetic circuit portion 41. It can be understood that the limiting boss 414 and the limiting stop 3342 can be a continuous annular structure, or a plurality of limiting structures can be arranged at intervals. In the vibration direction of the vibrator assembly 3, the projections of the limiting boss 414 and the limiting stop 3342 at least partially overlap to achieve a limiting effect on the vibrator assembly 3 in the vibration direction, so as to prevent the vibrator assembly 3 from vibrating greatly and falling off or pulling and damaging the elastic member 2 when the exciter 100 is hit or dropped.

[0085] It is understandable that the distance between the limiting boss 414 and the limiting stop 3342 is the same. Optionally, the horizontal gap between the limiting boss 414 and the hole wall of the limiting hole 331 is the same as the horizontal gap between the limiting stop 3342 and the outer wall of the inner magnetic circuit part 41.

[0086] In one embodiment, if Figure 2 and Figure 3 As shown, the inner magnetic circuit portion 41 includes an inner magnetic yoke 411, an inner magnet 412 and an inner magnetic plate 413 which are stacked in sequence, the inner magnetic plate 413 is connected to the stator assembly 1, the inner magnet 412 is sandwiched between the inner magnetic plate 413 and the inner magnetic yoke 411, and the inner magnetic yoke 411 extends toward the outer magnetic circuit portion 33 to form a limiting boss 414.

[0087] In this embodiment, the inner magnet 412 and the inner magnetic plate 413 of the inner magnetic circuit portion 41 are stacked on the side of the inner magnetic yoke 411 facing the back plate 12 of the stator assembly 1. Optionally, the inner magnet 412 is a permanent magnet. The inner magnetic plate 413 is a magnetic plate. It can be understood that the inner magnetic plate 413 is connected to the back plate 12 of the stator assembly 1, and extends from the inner magnetic yoke 411 toward the outer magnetic circuit portion 33 to form a limiting boss 414, thereby simplifying the structure of the inner magnetic yoke 411.

[0088] Optionally, the inner magnetic yoke 411 and the limiting boss 414 are an integrally formed structure, and the inner magnetic yoke 411 and the limiting boss 414 are located in the same plane. In this embodiment, the projections of the inner magnet 412 and the inner magnetic plate 413 on the stator assembly 1 are located within the projection range from the inner magnetic yoke 411 to the stator assembly 1, that is, the outer diameter of the inner magnet 412 is the same as that of the inner magnetic plate 413, and is smaller than the outer diameter of the inner magnetic yoke 411.

[0089] In this embodiment, the inner magnet 412 and the inner magnetic conductive plate 413 have the same shape and structure profile. Optionally, the inner magnet 412 and the inner magnetic conductive plate 413 are in a plate-like structure, a strip-like structure, or a block-like structure. The projection area of ​​the inner magnet 412 on the stator assembly 1 is the same as the projection area of ​​the inner magnetic conductive plate 413 on the stator assembly 1.

[0090] It can be understood that in order to allow a gap between the limiting boss 414 and the limiting stop 3342 in the up-down direction or in the vertical direction, as shown in FIG. Figure 3 As shown, the projection of the limiting boss 414 on the stator assembly 1 at least partially overlaps with the projection of the limiting stop 3342 on the stator assembly 1 .

[0091] In one embodiment, the inner magnetic yoke 411, the inner magnet 412 and the inner magnetic plate 413 are all arranged in a ring shape, so that a hollow area is formed in the middle of the inner magnetic yoke 411, the inner magnet 412 and the inner magnetic plate 413. It can be understood that by adjusting the weight of the inner magnetic circuit part 41 to achieve the purpose of weight reduction, the vibration characteristics of the back plate 12 are adjusted, and the vibration performance of the exciter 100 is improved, thereby improving the sound performance of the electronic device.

[0092] Optionally, the inner magnetic yoke 411, the inner magnet 412 and the inner magnetic plate 413 may be annular structures, so that a hollow area is formed in the middle of the inner magnetic yoke 411, the inner magnet 412 and the inner magnetic plate 413 to achieve the purpose of weight reduction. It can be understood that by setting a hollow area in the middle of the inner magnetic circuit part 41 to achieve the purpose of weight reduction, the high-frequency sound output of the exciter 100 is improved. Optionally, the hollow area can be selected as a through hole or a through groove structure. Of course, the hollow area includes multiple, and the multiple hollow areas are arranged at intervals, which is not limited here.

[0093] In another embodiment, the inner magnetic yoke 411 is arranged in a ring shape, so that a hollow area is formed in the middle of the inner magnetic yoke 411, and the inner magnet 412 and the inner magnetic plate 413 each include a plurality of inner magnets 412, and the plurality of inner magnetic plates 413 are respectively stacked on the plurality of inner magnets 412, and the plurality of inner magnets 412 are arranged at intervals and around the hollow area.

[0094] It can be understood that the inner magnetic yoke 411 is arranged in an annular shape, and the inner magnet 412 and the inner magnetic plate 413 each include a plurality, and the plurality of inner magnets 412 and the plurality of inner magnetic plates 413 correspond to each other one by one, and the plurality of inner magnets 412 and the plurality of inner magnetic plates 413 are arranged at intervals and in an annular shape, so that the middle of the inner magnetic yoke 411, the inner magnet 412 and the inner magnetic plate 413 forms a hollow area, which is not limited here. Optionally, the shape and structural contours of the inner magnet 412 and the inner magnetic plate 413 are the same. Of course, in other embodiments, the inner magnet 412 includes a plurality, and the plurality of inner magnets 412 are arranged at intervals and in an annular shape, and the inner magnetic plate 413 has an annular structure, which is not limited here.

[0095] In one embodiment, the vibrator assembly 3 also includes an inner frame 31, the inner side of the inner frame 31 is connected to the periphery of the outer magnetic circuit portion 33, and the outer side of the inner frame 31 is connected to the elastic member 2, so that the inner frame 31 and the outer magnetic circuit portion 33 are suspended on the support portion 111 through the elastic member 2.

[0096] In this embodiment, if Figure 1 , Figure 2 , Figure 3 and Figure 7 As shown, the inner frame 31 can be selected as a frame body or a frame structure, that is, the inner frame 31 is open at both ends and has a cavity inside. The inner frame 31 is used to install, fix and support the outer magnetic circuit part 33. It can be understood that the inner frame 31 is arranged on the periphery of the outer magnetic circuit part 33, and is suspended on the support part 111 of the outer frame 11 of the stator assembly 1 away from the back plate 12 through the elastic member 2.

[0097] In one embodiment, the outer magnetic circuit portion 33 includes an outer magnetic yoke 332, an outer magnet 333 and an outer magnetic plate 334, wherein the outer magnetic yoke 332 includes a bottom plate 3321 and a side plate 3322 arranged at an angle, the bottom plate 3321 and / or the side plate 3322 are connected to the inner frame 31, the bottom plate 3321 is provided with a first through hole 3323, the external magnet 333 is arranged on the side of the bottom plate 3321 facing the sound cavity 5 and is spaced from the side plate 3322, the outer magnet 333 is provided with a second through hole 3331 corresponding to the first through hole 3323, the outer magnetic plate 334 is arranged on the side of the external magnet 333 facing away from the bottom plate 3321 and is spaced from the side plate 3322, the outer magnetic plate 334 is provided with a third through hole 3341 corresponding to the second through hole 3331, the first through hole 3323, the second through hole 3331 and the third through hole 3341 are connected in sequence to form a limiting hole 331.

[0098] In this embodiment, if Figure 2 , Figure 3 and Figure 8 As shown, the outer magnetic circuit portion 33 is connected and fixed to the inner frame 31 through the outer magnetic yoke 332, and the outer magnet 333 and the outer magnetic plate 334 are stacked and arranged on the side of the outer magnetic yoke 332 facing the back plate 12 of the stator assembly 1. Optionally, the outer magnet 333 is a permanent magnet, and the outer magnetic plate 334 is a magnetic plate. It can be understood that the limiting hole 331 is sequentially arranged through the outer magnetic yoke 332, the outer magnet 333 and the outer magnetic plate 334, that is, the bottom plate 3321 is provided with a first through hole 3323 corresponding to the inner magnetic circuit portion 41, the outer magnet 333 is provided with a second through hole 3331 corresponding to the first through hole 3323, and the outer magnetic plate 334 is provided with a third through hole 3341 corresponding to the second through hole 3331, so that the first through hole 3323, the second through hole 3331 and the third through hole 3341 are connected in sequence to form the limiting hole 331.

[0099] It can be understood that the outer magnetic yoke 332, the outer magnet 333 and the outer magnetic plate 334 can be selected as an annular structure, so that the outer magnetic yoke 332, the outer magnet 333 and the outer magnetic plate 334 form a limiting hole 331. Of course, in other embodiments, the outer magnet 333 and the outer magnetic plate 334 each include a plurality of outer magnets 333 and a plurality of outer magnetic plates 334, and the plurality of outer magnets 333 and the plurality of outer magnetic plates 334 correspond to each other one by one, and the plurality of outer magnets 333 and the plurality of outer magnetic plates 334 are arranged at intervals and arranged around the first through hole 3323, which is not limited here.

[0100] Of course, in other embodiments, the external magnet 333 includes a plurality of external magnets 333 which are spaced apart and arranged around the inner magnetic circuit portion 41 , and the external magnetic conductive plate 334 is an annular structure, which is not limited here.

[0101] In one embodiment, the inner magnetic circuit portion 41 and the outer magnetic circuit portion 33 are magnetized in the vertical direction, and the magnetization directions of the inner magnetic circuit portion 41 and the outer magnetic circuit portion 33 are opposite. It can be understood that when the inner magnet 412 of the inner magnetic circuit portion 41 and the outer magnet 333 of the outer magnetic circuit portion 33 are magnetized in the vertical direction, the magnetization directions of the inner magnet 412 and the outer magnet 333 are opposite. Optionally, the vibration direction of the outer magnetic circuit portion 33 is the same as the vertical direction.

[0102] In this embodiment, the outer magnetic yoke 332 includes a bottom plate 3321 and a side plate 3322 which are arranged at an angle, the outer magnet 333 and the outer magnetic plate 334 are stacked on the side of the bottom plate 3321 facing the back plate 12 of the stator assembly 1, and the outer magnet 333 and the outer magnetic plate 334 are spaced from the side plate 3322 to form an external magnetic gap 35.

[0103] It can be understood that the outer magnetic circuit part 33 is provided with an outer magnetic gap 35, so as to provide avoidance and suspension space for the voice coil 13, so that the voice coil 13 introduces the AC signal into the magnetic field of the outer magnetic circuit part 33, and converts the electrical signal into the mechanical operation of the vibration of the outer magnetic circuit part 33. In this embodiment, by providing a limiting hole 331 in the outer magnetic circuit part 33, the outer magnetic gap 35 is located outside the limiting hole 331, so that the cooperation of the inner magnetic circuit part 41 and the limiting hole 331 is conveniently used to limit the outer magnetic circuit part 33 in the horizontal and vertical directions. When the exciter 100 or the electronic device falls or collides, the inner magnetic circuit part 41 is used to limit the vibrator assembly 3, so as to effectively avoid damage to the vibrator assembly 3, and cooperate with the elastic member 2 to further avoid deformation or tearing of the exciter 100.

[0104] In one embodiment, if Figure 2 , Figure 3 and Figure 8As shown, the periphery of the bottom plate 3321 facing away from the outer magnet 333 forms a limiting step 3324, and the limiting step 3324 is arranged around the first through hole 3323. The inner frame 31 is provided with a support platform 311, and the support platform 311 supports and limits the limiting step 3324. It can be understood that the limiting step 3324 is a step structure, and the support platform 311 supports and overlaps the limiting step 3324. Optionally, the support platform 311 and the limiting step 3324 can be connected by gluing or welding, etc., which is not limited here.

[0105] In one embodiment, if Figure 2 , Figure 3 and Figure 8 As shown, one of the side plate 3322 and the inner wall of the inner frame 31 is provided with a positioning protrusion 3325, and the other is provided with a positioning groove 312, and the positioning protrusion 3325 is accommodated and limited in the positioning groove 312. It can be understood that the side plate 3322 is provided with a positioning protrusion 3325, and the inner wall of the inner frame 31 is provided with a positioning groove 312, and the positioning protrusion 3325 is accommodated and limited in the positioning groove 312. Of course, the side plate 3322 is provided with a positioning groove 312, and the inner wall of the inner frame 31 is provided with a positioning protrusion 3325, which is not limited here.

[0106] In this embodiment, the positioning protrusion 3325 and the positioning groove 312 can be annular structures. Of course, the positioning protrusion 3325 and the positioning groove 312 each include a plurality of positioning protrusions 3325 and a plurality of positioning grooves 312 are arranged in a one-to-one correspondence.

[0107] In one embodiment, if Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, one of the inner frame 31 and the elastic member 2 is provided with a fixing boss 313, and the other is provided with a fixing groove 22, and the fixing boss 313 is accommodated and limited in the fixing groove 22. It can be understood that the periphery of the inner frame 31 is provided with a fixing boss 313, and 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 here.

[0108] In one embodiment, if Figure 3 As shown, one side of the outer magnetic conductive plate 334 adjacent to the third through hole 3341 extends toward the inside of the third through hole 3341 to form a limit stop 3342, and an end of the inner magnetic circuit portion 41 away from the stator assembly 1 is provided with a limit boss 414, and the limit stop 3342 is located between the limit boss 414 and the stator assembly 1; and / or, the projections of the limit boss 414 and the limit stop 3342 in the vibration direction of the vibrator assembly 3 at least partially overlap.

[0109] It can be understood that the limit stop 3342 extends toward the limit hole 331 and is located between the limit boss 414 and the stator assembly 1. The projections of the limit boss 414 and the limit stop 3342 in the vibration direction of the vibrator assembly 3 at least partially overlap. In this way, the limit boss 414 and the limit stop 3342 cooperate with each other to achieve the upper limit of the vibration direction of the vibrator assembly 3, preventing the vibrator assembly 3 from vibrating greatly and pulling and damaging the elastic member 2 when the exciter 100 is subjected to external force or falls, thereby improving the reliability of the exciter 100.

[0110] Optionally, the outer magnetic conductive plate 334 and the limit stop 3342 are integrally formed. In this embodiment, the outer magnetic conductive plate 334 and the limit stop 3342 are located in the same plane. It can be understood that in order to ensure the structure and processing convenience of the outer magnetic conductive plate 334, the limit stop 3342 and the hole wall of the third through hole 3341 are smoothly transitioned.

[0111] In one embodiment, the inner magnetic circuit portion 41 and the outer magnetic circuit portion 33 are spaced to form an inner magnetic gap 34, and the inner voice coil 42 is disposed in the inner magnetic gap 34; the stator assembly 1 includes an outer frame 11 and a back plate 12, 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 support portion 111, one end of the inner magnetic circuit portion 41 is connected to the back plate 12, the outer magnetic circuit portion 33 is suspended on the support portion 111 through the elastic member 2, and the back plate 12, the outer frame 11, the elastic member 2 and the outer magnetic circuit portion 33 are surrounded to form a sound cavity 5; wherein, the inner voice coil 42 is disposed on the side of the back plate 12 facing the outer magnetic circuit portion 33, and the inner voice coil 42 is fitted and fixed to the inner magnetic circuit portion 41.

[0112] In this embodiment, if Figures 2 to 5 As shown, the outer frame 11 can be selected as a frame body or a frame structure, that is, the outer frame 11 is open at both ends and has a cavity structure inside. The outer frame 11 is used to support, install and fix the back plate 12, the inner voice coil 42 and the outer magnetic circuit part 33 of 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 outer magnetic circuit part 33 of the vibrator assembly 3 is suspended from the support part 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 the sound cavity 5.

[0113] It can be understood that the inner magnetic circuit portion 41 and the outer magnetic circuit portion 33 are spaced apart to form an inner magnetic gap 34, and the inner voice coil 42 is located in the sound cavity 5, one end of the inner voice coil 42 is connected to the back plate 12, and the other end is suspended in the inner magnetic gap 34, so that when an AC signal is passed into the inner voice coil 42, the inner voice coil 42 introduces the AC signal into the inner magnetic gap 34, so that the outer magnetic circuit portion 33 of the vibrator assembly 3 is affected by the electromagnetic force and vibrates, and then the inertial force of the outer magnetic circuit portion 33 is transmitted to the stator assembly 1 and then to the screen, causing the screen to resonate and make sound.

[0114] In this embodiment, the inner voice coil 42 is a multi-turn coil wound by a wire, and the back plate 12 plays the role of supporting and fixing the inner voice coil 42, and is also used to be fixedly connected to the screen of the electronic device. It can be understood that the inner voice coil 42 is arranged around the inner magnetic circuit part 41. Optionally, the inner wall of the inner voice coil 42 is connected and fixed to the outer wall of the inner magnetic circuit part 41. The limiting boss 414 of the inner magnetic circuit part 41 covers the inner voice coil 42, that is, the projection of the inner voice coil 42 on the back plate 12 is located within the projection range of the limiting boss 414 on the back plate 12.

[0115] Optionally, the back plate 12 is a flat plate structure. It can be understood that in order to achieve the limit of the inner magnetic circuit part 41 in the horizontal direction (i.e., perpendicular to the vibration direction of the vibrator assembly 3), the distance from the inner voice coil 42 to the limit stop 3342 is greater than the distance from the inner magnetic circuit part 41 to the hole wall of the limit hole 331. That is, the distance from the inner voice coil 42 to the limit stop 3342 along the horizontal direction is greater than the distance from the inner magnetic circuit part 41 to the hole wall of the limit hole 331 along the horizontal direction.

[0116] In this embodiment, in the vibration direction perpendicular to the vibrator assembly 3, the distance from the inner voice coil 42 to the inner wall of the inner magnetic gap 34 is greater than the distance between the inner magnetic circuit portion 41 and the outer magnetic circuit portion 33. It can be understood that the distance between the inner magnetic circuit portion 41 and the outer magnetic circuit portion 33 can be the distance from the limiting boss 414 to the outer magnetic circuit portion 33 or the distance from the limiting stop 3342 to the inner magnetic circuit portion 41. In this way, the limiting assembly 4 is used to limit the vibration of the vibrator assembly 3. In this way, when the exciter 100 or the electronic device falls or collides, the limiting assembly 4 is used to limit the vibrator assembly 3, thereby effectively preventing the vibrator assembly 3 from vibrating significantly, pulling and damaging the elastic member 2, and improving the reliability of the exciter 100.

[0117] It is understandable that the material of the back plate 12 can be selected from metal materials, polymer materials, fiber composite materials or ceramic materials. Of course, the material of the back plate 12 can also be a piezoelectric ceramic material. Optionally, the piezoelectric ceramic material includes PZT, lead metaniobate, PbTiO 3 、BaTiO 3 , one of BNT.

[0118] In this embodiment, the material of the back plate 12 can also be piezoelectric ceramic material, and the inverse piezoelectric effect of the piezoelectric ceramic material can be utilized, that is, when power is turned on, the piezoelectric ceramic can produce deformation or mechanical stress, thereby stimulating the screen to vibrate, so as to improve the frequency response performance of the electronic device in the medium and high frequencies.

[0119] like Fig.10As shown, the performance comparison between the back plate 12 of the actuator 100 made of metal material, polymer material, fiber composite material or ceramic material and the back plate 12 made of piezoelectric ceramic material shows that when the back plate 12 of the actuator 100 is made of piezoelectric ceramic material, the inverse piezoelectric effect of the piezoelectric ceramic material can be utilized, that is, when powered on, the piezoelectric ceramic can produce deformation or mechanical stress, thereby stimulating the screen to vibrate, so as to improve the frequency response performance of the electronic device at high frequencies. It can be understood that piezoelectric ceramics exhibit piston motion at low frequencies, but due to the small displacement, their low-frequency output capacity is weak, but at high frequencies, the piezoelectric ceramics transition to split vibration, at which time a larger force output can be achieved.

[0120] Since the traditional exciter is affected by the weight and size of the stator assembly 1, its high-frequency performance is limited; when the back plate 12 is made of a piezoelectric ceramic plate, when the exciter 100 is working, the piezoelectric ceramic receives a signal greater than 5kHz, which compensates for the high-frequency performance of the exciter 100. Therefore, the exciter 100 has a stable force output in both the low-frequency band and the high-frequency band, and when applied to electronic equipment, the full-band sound performance of the electronic equipment is improved.

[0121] In this embodiment, the thickness of the back plate 12 is 0.05 mm to 0.5 mm. Optionally, the thickness of the back plate 12 is 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc., which is not limited here.

[0122] In one embodiment, an external magnetic gap 35 is further provided on the side of the external magnetic circuit portion 33 facing the sound cavity 5. The external magnetic gap 35 is located on the outside of the internal magnetic gap 34 and is arranged around the internal magnetic gap 34. The stator assembly 1 also includes an outer voice coil 14, which is arranged around the inner voice coil 42 and is located between the support portion 111 and the inner voice coil 42. One end of the outer voice coil 14 is suspended in the external magnetic gap 35.

[0123] In this embodiment, if Figure 2 and Figure 3 As shown, it can be understood that an external magnetic gap 35 is provided on the side of the external magnetic circuit part 33 facing the sound cavity 5, that is, the external magnet 333 and the external magnetic conductive plate 334 of the external magnetic circuit part 33 are spaced apart from the side plate 3322 to form an external magnetic gap 35, and the outer voice coil 14 is located in the sound cavity 5, one end of the outer voice coil 14 is connected to the back plate 12, and the other end is suspended in the external magnetic gap 35, and the outer voice coil 14 is arranged around the inner voice coil 42, so that an AC signal is introduced into the outer voice coil 14, so that the voice coil 13 introduces the AC signal into the external magnetic gap 35, so that the external magnetic circuit part 33 of the vibrator assembly 3 is subjected to the electromagnetic force and vibrates, and then the inertial force of the external magnetic circuit part 33 is transmitted to the screen, so that the screen resonates and makes sound.

[0124] In this embodiment, the outer voice coil 14 is a multi-turn coil wound by a wire, and the back plate 12 plays the role of supporting and fixing the outer voice coil 14, and is also used to fix the screen of the electronic device. It can be understood that in order to achieve the horizontal limitation of the inner magnetic circuit part 41, the distance from the outer voice coil 14 to the inner wall of the outer magnetic gap 35 is greater than the distance from the inner magnetic circuit part 41 to the hole wall of the limiting hole 331. That is, the distance from the outer voice coil 14 to the inner wall of the outer magnetic gap 35 in the horizontal direction is greater than the distance between the inner magnetic circuit part 41 and the vibrator assembly 3. It can be the horizontal distance between the limiting boss 414 and the outer magnetic circuit part 33, or it can be the horizontal distance between the limiting stop 3342 of the outer magnetic circuit part 33 and the inner magnetic circuit part 41.

[0125] It can be understood that the current direction of the inner voice coil 42 is opposite to that of the outer voice coil 14. In this embodiment, by arranging the two-part structure of the outer magnetic circuit part 33 and the inner magnetic circuit part 41 on the vibrator assembly 3, an inner magnetic gap 34 is formed between the outer magnetic circuit part 33 and the inner magnetic circuit part 41, and an outer magnetic gap 35 is formed on the side of the outer magnetic circuit part 33 facing the back plate 12, and by arranging the inner voice coil 42 and the outer voice coil 14 on the back plate 12, the inner voice coil 42 and the outer voice coil 14 are suspended in the inner magnetic gap 34 and the outer magnetic gap 35 respectively, so that the inner voice coil 42 and the outer voice coil 14 are in the stronger magnetic field formed by the outer magnetic circuit part 33 and the inner magnetic circuit part 41, so as to increase the driving force on the outer magnetic circuit part 33, thereby improving the BL value of the electronic device.

[0126] In one embodiment, if Figure 4 and Figure 5 As shown, the back plate 12 is provided with a hollow hole 121 connected to the sound cavity 5, and the hollow hole 121 is located on the inner side or / and the outer side of the outer voice coil 14. It can be understood that by providing a hollow area such as the hollow hole 121 on the back plate 12, the purpose of weight reduction is achieved, thereby improving the high-frequency sound output of the screen. Optionally, the area of ​​the hollow hole 121 does not exceed 50% of the total area of ​​the back plate 12.

[0127] In this embodiment, the hollow hole 121 can be selected as a circular hole, an elliptical hole, a bar hole, a waist-shaped hole, a polygonal hole or a special-shaped hole, etc., which is not limited here. Optionally, the hollow hole 121 includes a plurality of hollow holes, and the plurality of hollow holes 121 are arranged at intervals. Of course, in other embodiments, one end of the plurality of hollow holes 121 can also be connected to form shapes of different patterns, which is not limited here. It can be understood that the hollow hole 121 is located on the inner side of the outer voice coil 14; or, the hollow hole 121 is located on the outer side of the outer voice coil 14; or, the hollow hole 121 is located on the inner and outer sides of the outer voice coil 14, which is not limited here. Of course, the hollow hole 121 is optionally located between the outer voice coil 14 and the inner voice coil 42. Optionally, the back plate 12 is made of metal aluminum.

[0128] In one embodiment, the elastic member 2 has a folded ring portion 21; the folded ring portion 21 is formed by a side of the elastic member 2 facing away from the sound cavity 5 being recessed toward the sound cavity 5; or, the folded ring portion 21 is formed by a side of the elastic member 2 facing away from the sound cavity 5 being protruded toward a side away from the sound cavity 5; or, the folded ring portion 21 has a plurality of protrusions and a plurality of recesses with continuous transitions.

[0129] In this embodiment, if Figure 2 , Figure 3 and Figure 6 As shown, by setting the folding ring portion 21 on the elastic member 2, the folding ring portion 21 of the elastic member 2 plays an elastic buffering role on the vibration of the outer magnetic circuit portion 33 of the vibrator assembly 3, thereby playing an auxiliary limiting role. It can be understood that the folding ring portion 21 can be a convex or concave structure, that is, the folding ring portion 21 is a convex structure formed by the side of the elastic member 2 facing away from the sound cavity 5 and convex toward the side away from the sound cavity 5; or, the folding ring portion 21 is a concave structure formed by the side of the elastic member 2 facing away from the sound cavity 5 and concave toward the inside of the sound cavity 5, which is not limited here.

[0130] Optionally, the elastic member 2 has a plurality of protrusions and a plurality of recesses with continuous transition, that is, the elastic member 2 is wavy.

[0131] Optionally, the elastic member 2 is made of a superelastic material, which is one of silicone rubber, fluorosilicone rubber, NBR, TPU, and TPE. It is understandable that by making the elastic member 2 of a superelastic material and selecting the material of the elastic member 2, the compliance of the elastic member 2 is further adjusted, thereby adjusting the vibration characteristics of the back plate 12 and effectively improving the force output of the exciter 100. Optionally, the stiffness coefficient of the elastic member 2 is 5N / m~50N / m.

[0132] In one embodiment, a limiting structure may be provided on the side of the elastic member 2 facing away from the sound cavity 5. The limiting structure may be a plurality of limiting protrusions arranged at intervals, or a limiting ring arranged continuously. The limiting structure and the elastic member 2 are integrally formed. The limiting structure is provided on the elastic member 2 to assist in limiting the space of the exciter 100 away from the side of the screen, so as to prevent the vibrator assembly 3 from touching the housing or other components of the electronic device when the vibration amplitude is too large, thereby affecting the vibration effect or damaging the housing.

[0133] The performance of the actuator 100 of the present invention is compared with that of the prior art actuator. Fig. 9 As shown, the exciter 100 of the present invention provides greater damping due to the folding ring portion 21 of the elastic member 2, so that the low frequency tends to be flat. At the same time, the vibrator assembly 3 of the exciter 100 of the present invention provides a larger BL value under the cooperation of the outer magnetic circuit part 33 and the inner magnetic circuit part 41 with the outer voice coil 14 and the inner voice coil 42, and the overall sound pressure level is higher than that of the prior art.

[0134] The present invention further proposes an electronic device, which includes a housing, a screen and the above-mentioned exciter 100. The specific structure of the exciter 100 refers to the aforementioned embodiment. Since the electronic device adopts all the technical solutions of all the aforementioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the aforementioned embodiments, which will not be described one by one here.

[0135] In this embodiment, the screen is connected to the casing and encloses the casing to form a cavity. The exciter 100 is disposed in the cavity, and the stator assembly 1 of the exciter 100 is connected to the screen.

[0136] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An exciter, characterized in that: The exciter comprises: A stator assembly, wherein the stator assembly is provided with a support portion; an elastic member, the elastic member being connected to the supporting portion; A vibrator assembly, the vibrator assembly comprising an external magnetic circuit portion, the external magnetic circuit portion being suspended on the support portion through the elastic member, the external magnetic circuit portion, the elastic member and the stator assembly forming a sound cavity, the external magnetic circuit portion being provided with a limiting hole communicating with the sound cavity; and A limiting assembly, the limiting assembly comprising an inner magnetic circuit portion and an inner voice coil arranged around the inner magnetic circuit portion, one end of the limiting assembly being connected to the stator assembly, and the other end of the limiting assembly being passed through the limiting hole and spaced from the hole wall of the limiting hole; Among them, a limiting boss is provided at one end of the inner magnetic circuit portion away from the stator assembly, and a limiting stop is provided at the outer magnetic circuit portion corresponding to the limiting boss; the limiting stop extends toward the limiting hole and is located between the limiting boss and the stator assembly; the projections of the limiting boss and the limiting stop in the vibration direction of the vibrator assembly at least partially overlap.

2. The actuator according to claim 1, characterized in that The inner magnetic circuit portion has two long axis sides and two short axis sides connected end to end; the limiting boss is convexly arranged on the two long axis sides; or, the limiting boss is convexly arranged on the two short axis sides; 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 inner magnetic circuit portion; Alternatively, the inner magnetic circuit portion is cylindrical, and the limiting boss is protruding from the periphery of the inner magnetic circuit portion and is arranged around the periphery of the inner magnetic circuit portion.

3. The actuator according to claim 1, characterized in that The inner magnetic circuit portion includes an inner magnetic yoke, an inner magnet and an inner magnetic plate which are stacked in sequence. The inner magnetic plate is connected to the stator assembly. The inner magnetic yoke extends toward the outer magnetic circuit portion to form the limiting boss.

4. The actuator according to claim 3, characterized in that The outer diameter of the inner magnet is the same as that of the inner magnetic conductive plate and is smaller than the outer diameter of the inner magnetic conductive yoke; And / or, the inner magnetic yoke, the inner magnet and the inner magnetic plate are all arranged in a ring shape so that a hollow area is formed in the middle of the inner magnetic circuit part; or, the inner magnetic yoke is arranged in a ring shape so that a hollow area is formed in the middle of the inner magnetic yoke, and the inner magnet and the inner magnetic plate each include a plurality of inner magnetic plates, and the plurality of inner magnetic plates are respectively stacked on the plurality of inner magnets, and the plurality of inner magnets are arranged at intervals and arranged around the hollow area.

5. The actuator according to claim 1, characterized in that The vibrator assembly also includes an inner frame, the inner side of which is connected to the periphery of the outer magnetic circuit portion, and the outer side of which is connected to the elastic member, so that the inner frame and the outer magnetic circuit portion are suspended on the support portion through the elastic member.

6. The actuator according to claim 5, characterized in that The external magnetic circuit part comprises: An outer magnetic yoke, the outer magnetic yoke comprising a bottom plate and a side plate arranged at an angle, the bottom plate and / or the side plate are connected to the inner frame, and the bottom plate is provided with a first through hole; an external magnet, the external magnet being disposed on a side of the bottom plate facing the acoustic cavity and spaced apart from the side plate, the external magnet being provided with a second through hole corresponding to the first through hole; and An outer magnetic conductive plate is arranged on the side of the outer magnet facing away from the bottom plate and is spaced from the side plate. The outer magnetic conductive plate is provided with a third through hole corresponding to the second through hole. The first through hole, the second through hole and the third through hole are connected in sequence to form the limiting hole.

7. The actuator according to claim 6, characterized in that A limiting step is formed on the periphery of the bottom plate facing away from the outer magnet, the limiting step is arranged around the first through hole, the inner frame is provided with a support platform, and the support platform is limited to the limiting 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 is provided with a positioning groove, and the positioning protrusion is accommodated and limited in the positioning groove; And / or, one of the inner frame and the elastic member is provided with a fixing boss, and the other of the inner frame and the elastic member is provided with a fixing groove, and the fixing boss is accommodated and limited in the fixing groove; And / or, a side of the outer magnetic conductive plate adjacent to the third through hole extends toward the third through hole to form a limit stop, and an end of the inner magnetic circuit portion away from the stator assembly is provided with a limit boss, and the limit stop is located between the limit boss and the stator assembly; and / or, the projections of the limit boss and the limit stop in the vibration direction of the vibrator assembly at least partially overlap.

8. The actuator according to claim 1, characterized in that The inner magnetic circuit portion and the outer magnetic circuit portion are spaced apart to form an inner magnetic gap, and the inner voice coil is arranged in the inner magnetic gap; the stator assembly comprises: Frame; and A back plate, the back plate is connected to one end of the outer frame so that the other end of the outer frame forms the support portion, one end of the inner magnetic circuit portion is connected to the back plate, the outer magnetic circuit portion is suspended from the support portion through the elastic member, and the back plate, the outer frame, the elastic member and the outer magnetic circuit portion enclose the acoustic cavity; Wherein, the inner voice coil is arranged on a side of the back plate facing the outer magnetic circuit part, and the inner voice coil is adhered and fixed to the inner magnetic circuit part.

9. The actuator according to claim 8, characterized in that An external magnetic gap is also provided on the side of the external magnetic circuit portion facing the acoustic cavity, and the external magnetic gap is located outside the internal magnetic gap and is arranged around the internal magnetic gap; The stator assembly also includes an outer voice coil, which is arranged around the inner voice coil and is located between the outer frame and the inner voice coil. One end of the outer voice coil is suspended in the outer magnetic gap.

10. The actuator according to claim 9, characterized in that The back plate is a flat plate structure; And / or, the material of the back plate is a metal material, a polymer material, a fiber composite material or a ceramic material; or, the material of the back plate is a piezoelectric ceramic material, and the piezoelectric ceramic material includes one of PZT, lead metaniobate, PbTiO3, BaTiO3, and BNT; And / or, the thickness of the back plate is 0.05 mm to 0.5 mm; And / or, the back plate is provided with a hollow hole connected to the sound cavity, and the hollow hole is located on the inner side and / or the outer side of the outer voice coil; And / or, the back plate is provided with a hollow hole connected to the sound cavity, and the area of ​​the hollow hole does not exceed 50% of the total area of ​​the back plate; And / or, the current directions of the inner voice coil and the outer voice coil are opposite.

11. The actuator according to any one of claims 1 to 10, characterized in that: The elastic member has a folding ring portion; The folding ring portion is formed by the side of the elastic member facing away from the acoustic cavity being concave toward the acoustic cavity; or, the folding ring portion is formed by the side of the elastic member facing away from the acoustic cavity being convex toward the side facing away from the acoustic cavity; Alternatively, the folding ring portion has a plurality of protrusions and a plurality of recesses with continuous transition.

12. The actuator according to any one of claims 1 to 10, characterized in that: The elastic member is made of a superelastic material, which is one of silicone rubber, NBR, TPU and TPE; And / or, the stiffness coefficient of the elastic member is 5N / m~50N / m; And / or, the inner magnetic circuit portion and the outer magnetic circuit portion are both magnetized in a vertical direction, and the magnetization directions of the inner magnetic circuit portion and the outer magnetic circuit portion are opposite; And / or, the resonant frequency of the exciter is 50 Hz~1000 Hz.

13. An electronic device, characterized in that: It comprises a casing, a screen and an exciter as claimed in any one of claims 1 to 12, wherein the screen is connected to the casing and is enclosed with the casing to form a cavity, the exciter is arranged in the cavity, and the stator assembly of the exciter is connected to the screen.

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