Shrapnel and application device

Abstract

The application discloses a spring sheet and an application device. The spring sheet is in a non-winding narrow and long structure, and comprises a first connecting part, a second connecting part and a deformation part connected between the first connecting part and the second connecting part. The first connecting part and the second connecting part are respectively connected to different components. The different components can relatively move along a first direction, or the different components are relatively static. The first connecting part, the deformation part and the second connecting part are located in different planes. The first connecting part is arranged along the first direction, the second connecting part is arranged along a second direction, the first direction is different from the second direction, the deformation part is in an arc structure protruding along the first direction, and the deformation part extends along a circumferential direction of one of the components. The spring sheet is beneficial to reduce magnetic leakage of the application device, reduce the cost of the application device, and has better centering capability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electroacoustic technology, and in particular to a spring sheet and an application device. BACKGROUND

[0002] Application devices, such as loudspeakers, are important acoustic components in electronic devices, which are transducer devices for converting electrical signals into acoustic signals. With the continuous progress and innovation of technology, the structural design of traditional loudspeakers is constantly being updated and changed, not only to meet the trend of thinness, but also to increasingly focus on performance optimization, while taking into account process simplification and cost control.

[0003] In order to solve the problem of the centering sheet affecting the vibration of the voice coil and being easily broken, the applicant proposes a planar spring, such as the elastic component and application device disclosed in application No. 202010458489.2, which is a planar spring. Through the design of the planar spring, the fatigue strength is increased, the risk of breakage is reduced, the vibration of the vibration unit is not affected, and the product performance is optimized. However, the design of the planar spring has a large span in the circumferential direction of the voice coil. Because the planar spring adopts a narrow and long structure with a winding design, the overall size of the planar spring is increased. The U-iron and the yoke need to be designed with slots to avoid the planar spring. The large size of the planar spring leads to a slotting angle of 30°-45° of a single U-iron, and the total angle of all slots accounts for 33%-50% of the entire U-iron circumference. Excessive slotting ratio leads to high magnetic leakage of the U-iron, which is 9%-15%. The magnetic utilization rate is low. To compensate for the magnetic leakage, a larger size U-iron is usually needed, resulting in high cost. In addition, the planar spring is also prone to problems of high resonance strength. SUMMARY

[0004] The main purpose of the present application is to provide a spring sheet and an application device, which aims to solve the problem of large magnetic leakage and high resonance strength of the application device caused by the planar spring in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a spring sheet, which is a non-winding narrow and long structure, comprising a first connecting part, a second connecting part, and a deformation part connected between the first connecting part and the second connecting part. The first connecting part and the second connecting part are connected to different parts, respectively. The different parts can move relative to each other in a first direction, or the different parts are relatively static.

[0006] The first connecting part, the deformation part and the second connecting part are located in different planes, the first connecting part is arranged along the first direction, the second connecting part is arranged along the second direction, the first direction is inconsistent with the second direction, the deformation part is an arc-shaped structure protruding along the first direction, and the deformation part extends along the circumference of one of the components.

[0007] Optionally, the deformation part is composed of arc-shaped segments and / or straight line segments.

[0008] Optionally, the deformation part includes at least two arc-shaped segments, and on a plane arranged along the second direction, the radii of the at least two arc-shaped segments are the same or different.

[0009] Optionally, the deformation part includes three arc-shaped segments, and the radii of the three arc-shaped segments are all different.

[0010] Optionally, the radii of the three arc-shaped segments increase in sequence from the first connecting part to the second connecting part.

[0011] Optionally, among the three arc-shaped segments, one arc-shaped segment close to the first connecting part is a first arc-shaped segment, and one arc-shaped segment close to the second connecting part is a second arc-shaped segment, the radius of the first arc-shaped segment is R1, and the radius of the second arc-shaped segment is R2, wherein 0.8≤R1 / R2≤1.3.

[0012] Optionally, the first arc-shaped segment and the second arc-shaped segment both protrude along the first direction, and the centers of the first arc-shaped segment and the second arc-shaped segment are located in the same plane.

[0013] Optionally, the other arc-shaped segment is a third arc-shaped segment, the third arc-shaped segment is located between the first arc-shaped segment and the second arc-shaped segment, and the first end and the second end of the third arc-shaped segment are connected to the first arc-shaped segment and the second arc-shaped segment respectively, wherein the first end of the third arc-shaped segment and the second end of the third arc-shaped segment are located in different planes.

[0014] Optionally, at least part of the structure of the third arc-shaped segment extends along the second direction, and the distance between the first end of the third arc-shaped segment and the second end of the third arc-shaped segment along the first direction is 0-2.5 mm.

[0015] Optionally, the first direction and the second direction are perpendicular to each other.

[0016] Optionally, the thickness of the elastic sheet is 0.1-0.5 mm; and / or the width of the elastic sheet is 1.5-4 mm.

[0017] Optionally, the elastic sheet is made of any one of phosphor bronze, iron, steel or alloy material.

[0018] The application further provides an application device, which comprises a vibrating unit and the elastic sheet according to any one of the above-mentioned embodiments, and the elastic sheet is used for balancing the vibration of the vibrating unit along the first direction.

[0019] Optionally, the application device comprises an elastic sheet group, which comprises at least three elastic sheets arranged uniformly along the circumference of the vibrating unit.

[0020] Optionally, the projection areas of any two adjacent elastic sheets on the vibrating unit at least partially overlap.

[0021] Optionally, the first connecting portions of the at least three elastic sheets are connected in sequence as an integral structure.

[0022] Optionally, the at least three elastic sheets are identical in structure, and the protruding directions of the deformation portions of the at least three elastic sheets are consistent.

[0023] Optionally, the application device is a sound emitting device, which comprises a support, the vibrating unit comprises a diaphragm and a voice coil connected to the diaphragm, the first connecting portion is connected to the voice coil, and the second connecting portion is connected to the support.

[0024] Alternatively, the vibrating unit comprises a diaphragm, a voice coil and a spider, the voice coil and the spider are connected to the same side of the diaphragm, the first connecting portion is connected to the spider, the second connecting portion is connected to the support, and the vibration displacement of the voice coil is 1mm-15mm.

[0025] And / or, the support is a housing or a magnetic yoke.

[0026] Optionally, the support is a housing, the magnetic yoke is located between the housing and the voice coil, and the magnetic yoke is provided with avoiding grooves corresponding to the positions of the elastic sheets and allowing the deformation portions to pass through.

[0027] Optionally, the avoiding grooves are distributed along the circumference of the magnetic yoke, and the total circumferential angle of the avoiding grooves accounts for 15%-35% of the total circumferential angle of the magnetic yoke.

[0028] Optionally, the application device is a sound emitting device, a motor or a multifunctional vibrating device.

[0029] Compared with the flat spring, the elastic sheet of the present application has a non-wound narrow and long structure, so that the elastic sheet has a single wire structure and narrow and long size, and there is no large span in the circumferential direction of the voice coil, and correspondingly, the opening angle and size of the avoiding slot provided on the yoke for avoiding the deformation part of the elastic sheet are small, the magnetic leakage is small, the utilization rate of the yoke is high, the size of the yoke can be correspondingly reduced, and the cost is low.

[0030] Moreover, since the first connecting part of the elastic sheet is arranged along the first direction, and the deformation part protrudes along the first direction, the first connecting part and the deformation part are not affected by the vertical vibration of the vibration unit, so that this part of structure is not dragged by the rotating force, has good fatigue resistance, and is not prone to the situation of fracture and falling off of the welding point between the elastic sheet and the welding pad of the voice coil, thereby ensuring the assembly effectiveness between the elastic sheet and the voice coil and having high reliability. Moreover, the deformation part extends along the circumference of the voice coil, so that the stress concentration of the deformation part is reduced, the fatigue strength is increased, and the risk of fracture of the elastic sheet is reduced. Since the deformation part has an arc structure protruding along the first direction, even in the case that the vibration displacement of the vibration unit is large, the deformation part can effectively inhibit the resonance strength of the elastic sheet during the displacement of the vibration unit in the first direction, avoid the risk of fracture, and keep good compliance of the elastic sheet, so as to provide sufficient displacement and not affect the vibration of the vibration unit, thereby optimizing the product performance. At the same time, the elastic sheet also restrains the reciprocating vibration of the vibration unit according to the vibration offset state of the vibration unit through the elastic deformation of the deformation part, prevents the vibration of the vibration unit, and makes the reciprocating vibration of the vibration unit more stable, thereby having better centering ability. The second connecting part arranged along the second direction not only facilitates the connection with the support, but also can increase the contact area between the second connecting part and the welding pad of the support, and since the deformation part extends along the circumference of the voice coil, the rotating force suffered by the elastic sheet during the vibration process can be inhibited, the fatigue resistance is good, the situation of fracture and falling off of the welding pad of the elastic sheet and the support is not prone to occur, the assembly effectiveness between the elastic sheet and the support is ensured, and the reliability is high. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without any creative labor.

[0032] Figure 1 It is a perspective view of the elastic sheet of an embodiment of the present application.

[0033] Figure 2 It is a side view of the elastic sheet of an embodiment of the present application.

[0034] Figure 3A top view of a spring sheet according to an embodiment of the present application;

[0035] Figure 4 A perspective view of an application device according to an embodiment of the present application;

[0036] Figure 5 A sectional view of an application device according to an embodiment of the present application;

[0037] Figure 6 A perspective view of a voice coil, a spring sheet and a magnetic circuit system in an application device according to an embodiment of the present application;

[0038] Figure 7 A top view of a voice coil, a spring sheet and a magnetic circuit system in an application device according to an embodiment of the present application;

[0039] Figure 8 A sectional view of an application device according to another embodiment of the present application;

[0040] Figure 9 A diagram for suppressing resonance strength of a spring sheet according to the present application;

[0041] Figure 10 A diagram for suppressing resonance strength of a planar spring according to the application with the application number 202010458489.2.

[0042] BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Reference Name Reference Name 10 Elastic sheet 40 Vibration unit 11 First connecting part 50 Magnetic circuit system 12 Second connecting part 51 Magnetic gap 13 Deformation part 52 Magnetic yoke 130 Arc segment 521 Avoidance groove 131 First arc segment 60 Diaphragm 132 Second arc segment 70 Support 133 Third arc segment 80 Droplet cup 20 Voice coil 100 Application device 30 Elastic sheet group

[0044] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work under the premise of the present application are within the protection scope of the present application.

[0046] It should be noted that if the embodiments of the present application involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings). If the certain posture changes, the directionality indication also changes accordingly.

[0047] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0048] The present application provides a spring sheet 10.

[0049] As shown in Figures 1 to 3 , the spring sheet 10 is in a non-winding narrow and long structure, comprising a first connecting part 11, a second connecting part 12 and a deformation part 13 connected between the first connecting part 11 and the second connecting part 12, the first connecting part 11 and the second connecting part 12 are connected to different components, the different components can move relative to each other along a first direction, or the different components are relatively static; the first connecting part 11, the deformation part 13 and the second connecting part 12 are located in different planes, and the first connecting part 11 is arranged along the first direction, the second connecting part 12 is arranged along a second direction, the first direction is different from the second direction, the deformation part 13 is an arc structure protruding along the first direction, and the deformation part 13 extends along the circumference of one of the components.

[0050] As shown in Figures 4 to 8 , the spring sheet 10 of the present embodiment is applied to an application device 100 such as a sound generating device, a motor or a multifunctional vibration device, and the present embodiment is described by taking the application of the spring sheet 10 to the sound generating device as an example. The sound generating device comprises the spring sheet 10 and a vibration unit 40, and the spring sheet 10 is used to balance the vibration of the vibration unit 40 along a first direction. The sound generating device further comprises a support 70. In one embodiment, the vibration unit 40 comprises a diaphragm 60 and a voice coil 20 connected to the diaphragm 60; the first connecting part 11 of the spring sheet 10 is connected to the voice coil 20, the second connecting part 12 is connected to the support 70, and / or the support 70 is a housing or a magnetic yoke 52; in another embodiment, the vibration unit 40 comprises the diaphragm 60, the voice coil 20 and a spider 80, the voice coil 20 and the spider 80 are connected to the same side of the diaphragm 60, the first connecting part 11 is connected to the spider 80, the second connecting part 12 is connected to the support 70, and / or the support 70 is a housing or a magnetic yoke 52.

[0051] Understandably, after the vibration unit 40 is connected to an electrical signal, it can vibrate vertically within the housing. The vibration direction of the vibration unit 40 is represented by the vertical direction or the up-down direction, and the direction perpendicular to the vibration of the vibration unit 40 is represented by the horizontal direction. In one embodiment, the first connecting portion 11 of the spring 10 is connected to the voice coil 20. Specifically, the voice coil 20 includes a frame and a voice coil wire wound around the frame. The first connecting portion 11 can be connected to the frame or to the voice coil wire. The second connecting portion 12 of the spring 10 is connected to the housing, realizing the assembly between the voice coil 20, the spring 10, and the housing. In another embodiment, the first connecting portion 11 is connected to the cup 80, and the second connecting portion 12 is connected to the housing. In other embodiments, the first connecting portion 11 is connected to the cup 80, and the second connecting portion 12 is connected to the yoke 52; or, the first connecting portion 11 is connected to the voice coil 20, and the second connecting portion 12 is connected to the yoke 52.

[0052] like Figures 4 to 8 As shown, specifically, in one embodiment, the application device 100 includes a vibration unit 40, a magnetic circuit system 50, and a housing for fixing the vibration unit 40 and the magnetic circuit system 50; wherein, the vibration unit 40 includes a diaphragm 60 and a voice coil 20 attached below the diaphragm 60; the magnetic circuit system 50 includes an upper magnetic guide plate, a magnet, and a lower magnetic guide plate, wherein the upper and lower magnetic guide plates are magnetically conductive structures used to correct the magnetic lines of force generated by the magnet, the magnetic circuit system 50 forms a magnetic gap 51, and the voice coil 20 is disposed in the magnetic gap 51 of the magnetic circuit system 50. The lower magnetic guide plate of the present invention can be a U-shaped structure, including a bottom wall and side walls, and a magnetic gap 51 is formed between the upper magnetic guide plate, the magnet, and the side walls of the lower magnetic guide plate, forming a relatively uniform magnetic field in the magnetic gap 51, and the voice coil 20 is disposed in the magnetic gap 51 with the relatively uniform magnetic field. The voice coil 20 is usually made of wound metal wire. When the voice coil 20 is connected to an electrical signal, it vibrates up and down in the magnetic field under the action of the Ampere force. The vibration direction of the voice coil 20 is represented by the vertical direction or the up and down direction. The direction perpendicular to the vibration of the voice coil 20 is represented by the horizontal direction. Since the diaphragm 60 and the voice coil 20 are fixed together by bonding or other means, when the voice coil 20 vibrates up and down according to the electrical signal, it will also drive the diaphragm 60 to vibrate, generating sound waves.

[0053] However, since the magnetic field in the magnetic gap 51 is only relatively uniform and not absolute, the position of the voice coil 20 will change during the vibration process. Furthermore, the magnetic field lines on the upper side of the magnetic gap 51 are arc-shaped. Therefore, the Ampere force on the voice coil 20 is not only in the vertical direction, but also includes Ampere forces in other directions. This causes the voice coil 20 to be prone to non-vertical polarization during the vibration process, which will further affect the vibration of the diaphragm 60.

[0054] In order to prevent the polarization of the voice coil 20, the elastic sheet 10 connecting the voice coil 20 and the support 70 can center the polarization of the voice coil 20, that is, ensure the voice coil 20 to vibrate in the magnetic gap 51. In an embodiment, the elastic sheet 10 is a centering sheet.

[0055] In an embodiment, the vibration unit 40 further comprises a cup 80 arranged on the diaphragm 60, and the cup 80 is connected to the voice coil 20 on the same side of the diaphragm 60. When the magnetic gap 51 is provided, the cup 80 is located outside the magnetic gap 51, and the elastic sheet 10 connecting the cup 80 and the support 70 can also center the polarization of the voice coil 20, that is, ensure the voice coil 20 to vibrate in the magnetic gap 51.

[0056] In an embodiment, the support 70 is a housing or a magnetic yoke 52. Since the housing can be used to support the components of the sound generating device, the support 70 is arranged as a housing, which can facilitate the fixation of the side of the elastic sheet 10 away from the vibration unit 40, and improve the centering support effect of the elastic sheet 10. Since most of the vibration unit 40 is close to the magnetic gap 51, and the distance between the vibration unit 40 and the magnetic yoke 52 is relatively small, connecting the side of the elastic sheet 10 away from the vibration unit 40 to the magnetic yoke 52 can save the setting distance of the elastic sheet 10, and facilitate to improve the centering support effect of the elastic sheet 10. It should be noted that, as described above, the fixation mode of the elastic sheet 10 in the embodiment includes various combinations: the first connecting part 11 and the second connecting part 12 of the elastic sheet 10 are connected to the voice coil 20 and the housing respectively, or the first connecting part 11 and the second connecting part 12 of the elastic sheet 10 are connected to the voice coil 20 and the magnetic yoke 52 respectively, or the first connecting part 11 and the second connecting part 12 of the elastic sheet 10 are connected to the cup 80 and the housing respectively, or the first connecting part 11 and the second connecting part 12 of the elastic sheet 10 are connected to the cup 80 and the magnetic yoke 52 respectively, all of which can better ensure the centering support effect of the elastic sheet 10.

[0057] In the elastic sheet 10 of the embodiment, the first connecting part 11, the deformation part 13 and the second connecting part 12 are located in different planes, the first connecting part 11 is arranged along a first direction, the second connecting part 12 is arranged along a second direction, the first direction is different from the second direction, the deformation part 13 is an arc structure protruding along the first direction, and the deformation part 13 extends along the circumferential direction of the component.

[0058] Specifically, the first direction is the up-down direction, which is represented by the vertical direction or the up-down direction, and the second direction is different from the first direction. In a preferred embodiment, the first direction is perpendicular to the second direction, that is, the second direction is a horizontal direction perpendicular to the first direction. In other embodiments, the second direction can be a direction substantially parallel to the horizontal direction. The embodiment is described taking the horizontal direction as the second direction.

[0059] In an embodiment, the support 70 is a housing, the magnetic yoke 52 is located between the housing and the voice coil 20, and the magnetic yoke 52 is provided with a plurality of avoiding grooves 521 corresponding to the positions of the elastic sheets 10, and the avoiding grooves 521 are used for avoiding the corresponding deformation portions 13. The first connecting portions 11 of the elastic sheets 10 are connected with the voice coil 20, the deformation portions 13 pass through the avoiding grooves 521, and the second connecting portions 12 are connected with the housing. Specifically, the magnetic yoke 52 is a U-shaped iron, and the avoiding grooves 521 are provided on the side walls of the magnetic yoke 52 and used for avoiding the corresponding deformation portions 13.

[0060] Compared with the planar spring, the elastic sheet 10 of the embodiment is in a non-winding narrow and long structure, so that the elastic sheet 10 is in a single-wire structure and narrow and long in size, and does not have a large span in the circumferential direction of the voice coil 20. Accordingly, the opening angle and size of the avoiding grooves 521 provided on the magnetic yoke 52 for avoiding the deformation portions 13 of the elastic sheet 10 are small, the magnetic leakage is small, the utilization rate of the magnetic yoke 52 is high, the size of the magnetic yoke 52 can be correspondingly reduced, and the cost is low.

[0061] In addition, the first connecting portion 11, the deformation portion 13, and the second connecting portion 12 of the elastic sheet 10 are located in different planes, that is, the elastic sheet 10 of the embodiment is a non-planar spring. The first connecting portion 11 is arranged along a first direction, that is, the first connecting portion 11 is arranged along the up-down direction. The second connecting portion 12 is arranged along a second direction, that is, the second connecting portion 12 is arranged along the horizontal direction. The deformation portion 13 is an arc-shaped structure protruding along the first direction, and the deformation portion 13 extends along the circumferential direction of the voice coil 20.

[0062] Understandably, when the spring 10 is assembled with the voice coil 20 or the bracket 70, the first connecting part 11 of the spring 10 can contact the pad of the voice coil 20, and the second connecting part 12 can contact the pad of the bracket 70. Solder paste is applied, and laser welding melts the solder paste to fix the first connecting part 11 to the pad of the voice coil 20 and the second connecting part 12 to the pad of the bracket 70, thus realizing the assembly of the spring 10 with the voice coil 20 and the bracket 70. Since the first connecting part 11 of the spring 10 is arranged vertically and the deformation part 13 protrudes vertically, the first connecting part 11 and the deformation part 13 are not affected by the vertical vibration of the vibration unit 40. Therefore, this part of the structure is not subjected to rotational force, has good fatigue resistance, and is less likely to experience solder joint breakage or detachment of the pads of the spring 10 and the voice coil 20, ensuring the effectiveness and high reliability of the assembly between the spring 10 and the voice coil 20. Furthermore, the deformation portion 13 extends circumferentially along the voice coil 20, which reduces stress concentration in the deformation portion 13, increases fatigue strength, and reduces the risk of breakage of the spring 10. Moreover, since the deformation portion 13 is a vertically convex arc-shaped structure, even when the vibration displacement of the vibration unit 40 is large, the deformation portion 13 can effectively suppress the resonance intensity of the spring 10, avoiding the risk of breakage. The compliance of the spring 10 is well maintained, providing sufficient displacement without affecting the vibration of the vibration unit 40, thus optimizing product performance. Simultaneously, the spring 10 also constrains the reciprocating vibration of the vibration unit 40 according to its vibration offset state through the elastic deformation of its deformation portion 13, preventing polarization of the vibration unit 40 and making its reciprocating vibration more stable with better centering capability. The second connecting part 12 is arranged in the horizontal direction, which not only facilitates the connection with the bracket 70, but also increases the contact area between the second connecting part 12 and the solder pad of the bracket 70. Since the deformation part 13 extends circumferentially along the voice coil 20, it can suppress the rotational force on the spring 10 during vibration, has good fatigue resistance, and is less likely to cause the solder pad of the spring 10 to break or fall off, thus ensuring the effective assembly between the spring 10 and the bracket 70 and high reliability.

[0063] Furthermore, the deformable part 13 is composed of an arc-shaped segment 130 and / or a straight segment, which has a simple structure and is easy to manufacture. Moreover, the deformable part 13, composed of an arc-shaped segment 130 and / or a straight segment, has sufficient elastic deformation, which can provide good compliance when the vibration unit 40 vibrates.

[0064] Specifically, in one embodiment, the deformable portion 13 includes at least two arc-shaped segments 130. On a plane arranged along the second direction, the radii of the at least two arc-shaped segments 130 are the same or at least partially different. The arrangement of at least two arc-shaped segments 130 facilitates the circumferential extension of the deformable portion 13 along the voice coil 20, suppressing the rotational force experienced by the spring 10 during vibration. The radii of the at least two arc-shaped segments 130 can be flexibly set according to actual needs. In one embodiment, on a plane arranged along the second direction, i.e., on a horizontal plane (i.e., on a horizontal plane viewed from above), the radii of the at least two arc-shaped segments 130 are the same, facilitating manufacturing. Figure 3 As shown, in another embodiment, on the horizontal plane, the radii of at least two arc segments 130 are at least partially different, so as to achieve uniform stress distribution by flexibly designing according to the different positions of the at least two arc segments 130 relative to the vibration unit 40 and the different forces they are subjected to.

[0065] like Figures 1 to 7 As shown, in one embodiment, the deformation portion 13 includes three arc-shaped segments 130, and the radii of the three arc-shaped segments 130 are all different on the plane disposed along the second direction. In this embodiment, based on the length and distribution of the spring piece 10, and in conjunction with its assembly method with the voice coil 20 and the bracket 70, the deformation portion 13 is divided into three arc-shaped segments 130. The three arc-shaped segments 130 are distributed sequentially from the voice coil 20 toward the bracket 70. The two outermost arc-shaped segments 130 are respectively connected to the first connecting portion 11 and the second connecting portion 12. Furthermore, the radii of the three arc-shaped segments 130 are all different on the horizontal plane to achieve uniform stress distribution.

[0066] Furthermore, the radii of the three arc segments 130 increase sequentially from the first connecting part 11 to the second connecting part 12. That is, the closer to the support 70, the larger the radius of the arc segment 130 becomes, and the smaller the degree of curvature becomes. The degree of curvature becomes more and more gentle as it moves away from the voice coil 20. This not only helps to achieve uniform stress distribution, but also the arc segment 130 closer to the voice coil 20 has a greater degree of curvature, which can better suppress the rotational force on the spring 10 during vibration. The arc segment 130 closer to the support 70 has a smaller degree of curvature, which facilitates a smooth connection with the second connecting part 12 arranged along the second direction, avoiding stress concentration. The arc segment 130 located in the middle position plays a smooth transition role, and its two ends are smoothly connected to the two arc segments 130 located on both sides, respectively, avoiding stress concentration.

[0067] In one embodiment, among the three arc-shaped segments 130, the arc-shaped segment 130 located near the first connecting portion 11 is the first arc-shaped segment 131, and the arc-shaped segment 130 located near the second connecting portion 12 is the second arc-shaped segment 132. To reduce resonance, the radii of the first arc-shaped segment 131 and the second arc-shaped segment 132 are set within a similar range. Preferably, the radius of the first arc-shaped segment 131 is R1, and the radius of the second arc-shaped segment 132 is R2, where 0.8 ≤ R1 / R2 ≤ 1.3. Specifically, R1 / R2 = 0.85, or R1 / R2 = 0.95, or R1 / R2 = 1.05, or R1 / R2 = 1.2. More preferably, 0.9 ≤ R1 / R2 ≤ 1.2.

[0068] In one embodiment, both the first arc-shaped segment 131 and the second arc-shaped segment 132 protrude along a first direction, that is, both the first arc-shaped segment 131 and the second arc-shaped segment 132 protrude vertically. In another embodiment, both the first arc-shaped segment 131 and the second arc-shaped segment 132 protrude upwards, consistent with the vibration direction of the vibration unit 40. This ensures that the first arc-shaped segment 131 and the second arc-shaped segment 132 are not affected by vertical vibration, exhibiting good fatigue resistance, and effectively suppressing the resonance intensity of the spring piece 10, thus avoiding the risk of breakage. Furthermore, the center of the first arc-shaped segment 131 and the center of the second arc-shaped segment 132 are located in the same plane, which not only facilitates manufacturing but also ensures a smooth transition between the first connecting portion 11 and the second connecting portion 12.

[0069] In a preferred embodiment, the radius of the first arc segment 131 should be close to or greater than the maximum displacement of the vibration unit 40 to reduce the stress on the spring piece 10 under large displacements of the vibration unit 40. Furthermore, the radius of the first arc segment 131 is relatively close to the radius of the second arc segment 132, resulting in better symmetry of the spring piece 10 and optimizing its compliance. Preferably, the ratio of the radius of the first arc segment 131 to the radius of the second arc segment 132 should not exceed 1.2.

[0070] Another arc segment 130 is a third arc segment 133, which is located between the first arc segment 131 and the second arc segment 132. The first and second ends of the third arc segment 133 are respectively connected to the first arc segment 131 and the second arc segment 132. The first and second ends of the third arc segment 133 are located on different planes. Figures 1 to 7 As shown, among the three arc segments 130, the arc segment 130 located in the middle position is the third arc segment 133. The first end of the second arc segment 132 and the second end of the third arc segment 133 are located on different planes and have a height difference between them to accommodate the vertical change between the first connecting part 11 and the second connecting part 12.

[0071] Furthermore, at least a portion of the structure in the third arc-shaped segment 133 extends along the second direction, and the distance between the first end and the second end of the third arc-shaped segment 133 along the first direction is 0–2.5 mm. For example… Figures 1 to 8 As shown, at least a portion of the structure in the third arc-shaped segment 133 extends horizontally. Understandably, the third arc-shaped segment 133 also extends circumferentially along the vibration unit 40. Preferably, the vertical distance between the first end and the second end of the third arc-shaped segment 133 is 0–2.5 mm, and the height difference between the two ends of the third arc-shaped segment 133 is 0–2.5 mm. Specifically, the height difference between the two ends of the third arc-shaped segment 133 is 0.5 mm, or 1 mm, or 1.5 mm. More preferably, the height difference between the two ends of the third arc-shaped segment 133 is 0–1.2 mm to better accommodate the height variations of the first connecting portion 11 and the second connecting portion 12.

[0072] In one embodiment, the thickness of the spring 10 is 0.1mm to 0.5mm; and / or, the width of the spring 10 is 1.5mm to 4mm. In a preferred embodiment, the spring 10 is designed with uniform thickness and width for ease of manufacturing. The thickness and width of the spring 10 can be flexibly set according to the K value (Kms, stiffness coefficient) of the application device 100. In one embodiment, the thickness of the spring 10 can be selected as 0.15mm, 0.3mm, or 0.45mm, meaning it can be made from standard sheet metal. The width of the spring 10 can be selected as 2mm, 2.5mm, 3mm, or 3.5mm. When Kms = 0.04 N / mm, the thickness of the spring 10 can be 0.15 mm and the width can be 2.5 mm; when Kms = 0.4 N / mm, the thickness of the spring 10 can be 0.3 mm and the width can be 2.5 mm; when Kms = 1.6 N / mm, the thickness of the spring 10 can be 0.45 mm and the width can be 3 mm.

[0073] In one embodiment, the spring 10 is made of any one of phosphor bronze, iron, steel or alloy materials, which is not easily affected by environmental changes, is not easily deformed in high temperature and high humidity environments, and its hardness does not change. It has good fatigue resistance, enabling the application device 100 to work in harsh environments, optimizing product performance and improving the application device 100's versatility.

[0074] Compared with the planar spring disclosed in application number 202010458489.2, the spring piece 10 of the present invention not only has less magnetic leakage but also better centering ability and can effectively suppress the resonance intensity of the spring piece 10. Table 1 below compares the centering ability of the spring piece 10 of the present invention and the planar spring disclosed in application number 202010458489.2 under the same K value; Table 2 compares the magnetic leakage of the spring piece 10 of the present invention and the planar spring disclosed in application number 202010458489.2 under the same K value. In both Table 1 and Table 2, a spring piece 10 with a thickness of 0.3 mm and a width of 2.6 mm is used for comparison with a planar spring with a diameter of 0.6 mm as disclosed in application number 202010458489.2.

[0075] Figure 9 This is a schematic diagram of how the spring piece 10 of the present invention suppresses resonance intensity. Figure 10 The diagram below illustrates the suppression of resonance intensity by a planar spring, as disclosed in application number 202010458489.2. Figure 9 and Figure 10 The comparison shows that the spring 10 of the present invention can more effectively suppress the resonance intensity of the spring 10 compared with the planar spring disclosed in application number 202010458489.2.

[0076] List 1:

[0077]

[0078] List 2:

[0079]

[0080] This invention also proposes an application device 100, which can be a sound-generating device, a motor, or a multifunctional vibration device, with a wide range of applications. This invention will be described using the application device 100 as a sound-generating device. The application device 100 includes a vibration unit 40 and the aforementioned spring 10, the spring 10 being used to balance the vibration of the vibration unit 40 along a first direction. There can be one or more vibration units 40, which can be arranged vertically or horizontally. The application device 100 further includes a support 70. In one embodiment, the vibration unit 40 includes a diaphragm 60 and a voice coil 20 connected to the diaphragm 60; a first connecting part 11 is connected to the voice coil 20, and a second connecting part 12 is connected to the support 70, and / or, the support 70 is a shell or a magnetic yoke 52; or, in another embodiment, the vibration unit 40 includes a diaphragm 60, a voice coil 20, and a cup 80, with the voice coil 20 and the cup 80 connected to the same side of the diaphragm 60, the first connecting part 11 connected to the cup 80, and the second connecting part 12 connected to the support 70, and / or, the support 70 is a shell or a magnetic yoke 52. The specific structure of the spring piece 10 in the application device 100 is as described in the above embodiments. Since the application device 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0081] like Figures 4 to 8 As shown, the application device 100 in this embodiment includes a spring sheet group 30, which includes at least three spring sheets 10 evenly spaced along the circumference of the vibrating unit 40. In one embodiment, the number of spring sheets 10 is three, and the three spring sheets 10 are evenly spaced along the outer periphery of the vibrating unit 40, which enhances the centering effect of the vibrating unit 40. Specifically, when the vibrating unit 40 vibrates vertically, the at least three spring sheets 10 form at least three constraints on the voice coil 20, which can prevent the vibrating unit 40 from being polarized, and the spring sheets 10 follow the vertical displacement of the vibrating unit 40, thus enhancing the centering effect of the vibrating unit 40. In other embodiments, the number of spring sheets 10 in the spring sheet group 30 can also be four, five, six, or other numbers. In a preferred embodiment, the number of spring sheets 10 in the spring sheet group 30 is preferably three or four. The number of spring sheets 10 in the application device 100 of the present invention can be flexibly adjusted according to the actual situation, and the present invention does not limit the number of spring sheets 10.

[0082] Furthermore, the projection areas of any two adjacent spring pieces 10 projected vertically onto the vibration unit 40 at least partially overlap. That is, in the circumferential direction of the vibration unit 40, the second connecting portion 12 of one spring piece 10 can extend to at least be opposite to the first connecting portion 11 of the other spring piece 10, so that the extension length of the spring piece 10 is sufficient to increase the compliance of the spring piece 10.

[0083] In one embodiment, among at least three spring pieces 10, a plurality of first connecting portions 11 are sequentially connected to form an integral structure. Understandably, the plurality of first connecting portions 11 can be connected to form an integral structure that is a ring surrounding the voice coil 20, which simplifies the structure of the spring piece assembly 30, improves structural stability, and facilitates assembly with the voice coil 20.

[0084] In a preferred embodiment, at least three spring pieces 10 have the same structure, and the protrusion direction of the deformation part 13 in at least three spring pieces 10 is consistent. This not only facilitates manufacturing and assembly, but also ensures the consistency of the centering effect of multiple spring pieces 10 on the vibration unit 40, thereby improving the product performance of the application device 100.

[0085] In one embodiment, the support 70 is a housing, and the magnetic yoke 52 is located between the housing and the voice coil 20. The magnetic yoke 52 has clearance grooves 521 at the positions of each spring piece 10, allowing the corresponding deformation portions 13 to pass through. The first connecting portion 11 of the spring piece 10 is connected to the voice coil 20, the deformation portion 13 passes through the clearance grooves 521, and the second connecting portion 12 is connected to the housing. Specifically, the magnetic yoke 52 is a U-shaped iron, and clearance grooves 521 for the corresponding deformation portions 13 to pass through are provided on the sidewall of the magnetic yoke 52.

[0086] Multiple clearance slots 521 are distributed at intervals along the circumference of the yoke 52, and the sum of the circumferential angles of the multiple clearance slots 521 along the yoke 52 accounts for 15% to 35% of the total circumferential angle of the yoke 52. Understandably, the number of clearance slots 521 corresponds to the number of spring pieces 10 and is set in a one-to-one manner. The total circumferential angle of the yoke 52 is 360°, and the sum of the circumferential angles of the multiple clearance slots 521 along the yoke 52 accounts for 15% to 35% of the total circumferential angle of the yoke 52, that is, the sum of the circumferential angles of the multiple clearance slots 521 along the yoke 52 is 54° to 126°. In one embodiment, there are four spring pieces 10, and the magnetic yoke 52 has four clearance slots 521. The sum of the circumferential angles of the four clearance slots 521 along the magnetic yoke 52 accounts for about 32% of the total circumferential angle of the magnetic yoke 52, that is, the sum of the circumferential angles of the four clearance slots 521 along the magnetic yoke 52 is about 115.2°. The sum of the circumferential angles of the four spring pieces 10 along the magnetic yoke 52 accounts for about 11% of the total circumferential angle of the magnetic yoke 52, that is, the sum of the circumferential angles of the four spring pieces 10 along the magnetic yoke 52 is about 39.6°. The angle of each clearance slot 521 is greater than the angle of the corresponding spring piece 10, so that the size of the clearance slot 521 is greater than the width of the corresponding spring piece 10. The spring piece 10 has sufficient clearance space in the clearance slot 521 to avoid affecting the vibration of the spring piece 10, and thus will not affect the vibration of the vibration unit 40.

[0087] The size of the spring piece 10 of this invention can be flexibly adjusted according to the power of the application device 100 and the vibration displacement of its voice coil 20. A spring piece 10 with a thickness greater than 0.25 mm and less than or equal to 0.4 mm can be applied to large loudspeakers with a voice coil 20 vibration displacement of 1 mm to 15 mm, and is even more suitable for large loudspeakers with a voice coil 20 vibration displacement of 3 mm to 7 mm. The width of the spring piece 10 can be adjusted according to the K value. It should be noted that in miniature loudspeakers, the vibration displacement of the voice coil 20 is less than 1 mm. In large loudspeakers, the vibration displacement of the voice coil 20 is greater than 1 mm. In this embodiment, the vibration displacement of the voice coil 20 can be selected as 1 mm to 15 mm, that is, the application device 100 is a large loudspeaker. Optionally, the vibration displacement of the voice coil 20 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc., and is not limited here. The vibration displacement of the voice coil 20 refers to the stable displacement during the normal operation of the application device 100, excluding the situation where the voice coil 20 receives an abnormal current or other abnormal conditions occur in the application device 100, which causes a sudden change in the displacement of the voice coil 20.

[0088] In one embodiment, when the application device 100 is a large loudspeaker, the voice coil 20 has a cylindrical structure, and the diameter of the voice coil 20 is relatively large, ranging from 14mm to 28mm. Optionally, the diameter of the voice coil 20 can be 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, etc. The diameter of the diaphragm 60 is 40mm to 75mm, that is, the diameter of the circle formed by the highest point of the diaphragm 60 can be 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, etc. The spring 10 of the present invention provides better support and centering for the voice coil 20 within this range.

[0089] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sheet of pellets, characterized in that, The elastic sheet is applied to an application device comprising a vibrating unit, for balancing the vibration of the vibrating unit along a first direction, at least three elastic sheets are arranged along the circumference of the vibrating unit, and the projection area of any two adjacent elastic sheets on the vibrating unit at least partially overlaps; The elastic sheet has a non-wound narrow and long structure, comprising a first connecting part, a second connecting part, and a deformation part connected between the first connecting part and the second connecting part, the first connecting part and the second connecting part are connected to different parts of the application device, one of the parts is a part of the vibrating unit, and the different parts can move relative to each other along a first direction, or the different parts are relatively static. The first connecting part, the deformation part, and the second connecting part are located in different planes, the first connecting part is arranged along the first direction, the second connecting part is arranged along a second direction, the first direction is different from the second direction, the deformation part has an arc structure protruding along the first direction, and the deformation part extends along the circumference of one of the parts.

2. The sheet of claim 1, wherein The deformation part is composed of arc segments and / or straight line segments.

3. The sheet of claim 2, wherein The deformation part comprises at least two arc segments, and the radii of the at least two arc segments are the same or different on a plane arranged along the second direction.

4. The sheet of claim 3, wherein The deformation part comprises three arc segments, and the radii of the three arc segments are all different.

5. The sheet of claim 4, wherein The radii of the three arc segments gradually increase from the first connecting part to the second connecting part.

6. The sheet of claim 3, wherein Among the three arc segments, one arc segment close to the first connecting part is a first arc segment, and one arc segment close to the second connecting part is a second arc segment, the radius of the first arc segment is R1, and the radius of the second arc segment is R2, wherein 0.8≤R1 / R2≤1.

3.

7. The sheet of claim 6, wherein The first arc segment and the second arc segment both protrude along the first direction, and the centers of the first arc segment and the second arc segment are located in the same plane.

8. The dart of claim 6, wherein, Another arc segment is a third arc segment, the third arc segment is located between the first arc segment and the second arc segment, and the first end and the second end of the third arc segment are connected to the first arc segment and the second arc segment respectively, wherein the first end of the third arc segment and the second end of the third arc segment are located in different planes.

9. The dart of claim 8, wherein, At least part of the structure of the third arc segment extends along the second direction, and the distance between the first end of the third arc segment and the second end of the third arc segment along the first direction is 0-2.5 mm.

10. The sheet of any one of claims 1 to 9, wherein The first direction and the second direction are perpendicular to each other. The thickness of the elastic sheet is 0.1-0.5 mm, and / or the width of the elastic sheet is 1.5-4 mm.

11. The sheet of any one of claims 1 to 9, wherein The elastic sheet is made of any one of phosphor bronze, iron, steel, or alloy materials.

12. The sheet of any one of claims 1 to 9, wherein The application device comprises a vibrating unit and the elastic sheet of any one of claims 1-12, and the elastic sheet is used to balance the vibration of the vibrating unit along the first direction.

13. An application apparatus characterized by comprising: ​ 14. The application apparatus of claim 13, wherein, The application device comprises an elastic sheet group, and the elastic sheet group comprises at least three elastic sheets which are uniformly arranged along the circumference of the vibration unit.

15. The application apparatus of claim 14, wherein, The projection areas of any two adjacent elastic sheets on the vibration unit at least partially overlap.

16. The application apparatus of claim 14, wherein, In the at least three elastic sheets, a plurality of the first connecting parts are sequentially connected into an integrated structure.

17. The application apparatus of claim 14 wherein, The at least three elastic sheets are of the same structure, and in the at least three elastic sheets, the protruding directions of the deformation parts are consistent.

18. The application apparatus of claim 14 wherein, The application device is a sound production device, the sound production device comprises a support, the vibration unit comprises a diaphragm and a voice coil connected to the diaphragm; the first connecting part is connected to the voice coil, the second connecting part is connected to the support, and the vibration displacement of the voice coil is 1mm-15mm. Alternatively, the vibration unit comprises a diaphragm, a voice coil and a trailing cup, the voice coil and the trailing cup are connected to the same side of the diaphragm, the first connecting part is connected to the trailing cup, and the second connecting part is connected to the support. Furthermore, the support is a housing or a magnetic yoke.

19. The application apparatus of claim 18, wherein, The support is a housing, the magnetic yoke is located between the housing and the voice coil, and the magnetic yoke is provided with an avoidance slot corresponding to the position of each elastic sheet for the corresponding deformation part to pass through.

20. The application apparatus of claim 19, wherein, A plurality of avoidance slots are distributed along the circumference of the magnetic yoke, and the sum of the circumferential angles of the plurality of avoidance slots accounts for 15%-35% of the total circumferential angle of the magnetic yoke.

21. The application apparatus of claim 14 wherein, The application device is a sound production device, a motor or a multifunctional vibration device.

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