Sound-generating devices and sound-generating equipment

Abstract

The present invention discloses a sound-generating device and a sound-generating equipment. The sound-generating device comprises a magnetic circuit system, a first vibration system and a second vibration system. The magnetic circuit system comprises a central magnetic circuit part and a side magnetic circuit part, and a magnetic gap is formed between the central magnetic circuit part and the side magnetic circuit part. The first diaphragm and the second diaphragm are respectively installed on two opposite surfaces of the magnetic circuit system, and the first voice coil and the second voice coil are inserted into the magnetic gap facing each other. The first voice coil is arranged around the periphery of the second voice coil, the second voice coil is arranged close to the central magnetic circuit part, and the first voice coil is arranged close to the side magnetic circuit part. The resistance values ​​of the first voice coil and the second voice coil are the same, and the BL value of the magnetic circuit system acting on the first vibration system is the same as the BL value of the magnetic circuit system acting on the second vibration system. The sound-generating device of the present invention realizes the consistency of its two-side performance and amplitude on the asymmetric structure of the two voice coils.

Description

Technical Field

[0001] The present invention relates to the technical field of sound-generating device structures, and in particular to a sound-generating device and a sound-generating equipment. Background Art

[0002] With the rapid development of the consumer electronics industry, there is a strong demand for various smart terminals. Consumers have higher and higher requirements for products, such as audio functions. At present, the double-sided sound device has great advantages in terms of product height while achieving the shock absorption effect of the whole machine. However, while reducing the height, the two voice coils need to be staggered, which is an asymmetric structure, and it is difficult to achieve consistency in performance and amplitude on both sides. Summary of the invention

[0003] The main purpose of the present invention is to provide a sound-generating device, aiming to achieve consistency in performance and amplitude on both sides of the sound-generating device based on the asymmetric structure of two voice coils.

[0004] To achieve the above object, the sound-generating device proposed by the present invention comprises:

[0005] A magnetic circuit system, the magnetic circuit system comprising a central magnetic circuit portion and a side magnetic circuit portion, wherein a magnetic gap is formed between the central magnetic circuit portion and the side magnetic circuit portion;

[0006] A first vibration system, the first vibration system comprising a first diaphragm and a first voice coil; and

[0007] A second vibration system, the second vibration system comprises a second diaphragm and a second voice coil, the first diaphragm and the second diaphragm are respectively arranged on two opposite surfaces of the magnetic circuit system, and the first voice coil and the second voice coil are inserted into the magnetic gap facing each other;

[0008] The first voice coil is arranged on the periphery of the second voice coil, the second voice coil is arranged close to the central magnetic circuit part, the first voice coil is arranged close to the side magnetic circuit part, the resistance value of the first voice coil and the second voice coil is the same, and the BL value of the magnetic circuit system acting on the first vibration system is the same as the BL value of the magnetic circuit system acting on the second vibration system.

[0009] In one embodiment, the voice coil wire length of the first voice coil is the same as the voice coil wire length of the second voice coil, and the number of winding turns of the first voice coil is less than the number of winding turns of the second voice coil.

[0010] In one embodiment, the central magnetic circuit portion includes a central magnet, a first central magnetic yoke and a second central magnetic yoke disposed on two opposite surfaces of the central magnet; the side magnetic circuit portion includes a side magnet, a first side magnetic yoke and a second side magnetic yoke disposed on the side magnet;

[0011] The width of the first central magnetic yoke is greater than the width of the central magnet, the first central magnetic yoke extends toward the first voice coil, and the central axis of the first central magnetic yoke coincides with the central axis of the central magnet.

[0012] In one embodiment, the distance between the outer circumference of the first voice coil and the side magnet is L1, and the distance between the inner circumference and the center magnet is L2, wherein the range of L1 / L2 is 1 / 6 to 1 / 3;

[0013] And / or, the distance between the outer circumference of the second voice coil and the side magnet is L3, and the distance between the inner circumference of the second voice coil and the center magnet is L4, wherein the range of L4 / L3 is 1 / 6 to 1 / 3.

[0014] In one embodiment, the distance between the first central magnetic yoke and the first voice coil is equal to the distance between the first side magnetic yoke and the first voice coil;

[0015] The distance between the second side magnetic yoke and the second voice coil is greater than the distance between the second center magnetic yoke and the second voice coil.

[0016] In one embodiment, the thickness of the first central magnetically conductive yoke is greater than the thickness of the second central magnetically conductive yoke, and the ratio of the thickness of the first central magnetically conductive yoke to the thickness of the second central magnetically conductive yoke is in a range of 1 to 1.5.

[0017] In one embodiment, a ratio of the number of winding turns Q2 of the second voice coil to the number of winding turns Q1 of the first voice coil is greater than 1 and less than 1.3.

[0018] In one embodiment, a first protrusion formed by winding is provided on a side of the free end of the first voice coil facing the side magnetic circuit portion; a second protrusion formed by winding is provided on a side of the free end of the second voice coil facing the side magnetic circuit portion.

[0019] In one embodiment, the first voice coil is wound with N layers of coils in the radial direction thereof, wherein N is a natural number and N is greater than or equal to 3, the outermost coil is the Nth layer coil, the height of the Nth layer coil and the N-1th layer coil is less than the height of the N-2th layer coil and the coils within the N-2th layer coil, and the Nth layer and the N-1th layer coil form the first protrusion;

[0020] And / or, the second voice coil is wound with M layers of coils in its radial direction, wherein M is a natural number and M is greater than or equal to 3, the outermost coil is the Mth coil, the height of the Mth coil is less than the height of the M-1th coil and the coils within the M-1th coil, and the Mth coil forms the second protrusion.

[0021] In one embodiment, the magnetic circuit system further includes two connecting parts, and on the short axis side of the sound-generating device, the first center magnetic yoke and the second side magnetic yoke are connected to form an integrated structure by the connecting parts.

[0022] In one embodiment, the first vibration system and the magnetic circuit system form a first sound-generating unit, and the second vibration system and the magnetic circuit system form a second sound-generating unit;

[0023] Wherein, the first sound emitting unit and the second sound emitting unit have the same vibration system force compliance and / or amplitude; and / or, the first sound emitting unit and the second sound emitting unit have the same resonance frequency and / or frequency response.

[0024] In one embodiment, the sound-generating device further comprises a shell assembly, wherein the shell assembly comprises a first shell and a second shell connected to each other, wherein the first vibration system is disposed on a surface of the first shell facing away from the second shell, and the second vibration system is disposed on a surface of the second shell facing away from the first shell;

[0025] The first diaphragm includes a first central portion and a first folding ring portion, and the second diaphragm includes a second central portion and a second folding ring portion. The outer periphery of the first folding ring portion is connected to the outer edge of the first shell, and the inner periphery is connected to the first central portion. The outer periphery of the second folding ring portion is connected to the outer edge of the second shell, and the inner periphery is connected to the second central portion. Both the first folding ring portion and the second folding ring portion are recessed in a direction away from the magnetic circuit system.

[0026] In one embodiment, the first vibration system further comprises a first support, wherein the inner periphery of the first support is clamped between the first voice coil and the inner periphery of the first folding ring, and the outer periphery of the first support is clamped between the outer periphery of the first folding ring and the edge of the first shell, and the first support is an integrally formed planar elastic member;

[0027] And / or, the second vibration system also includes a second support plate, the inner periphery of the second support plate is clamped between the second voice coil and the inner periphery of the second folding ring part, and the outer periphery is clamped between the outer periphery of the second folding ring part and the edge of the second shell, and the second support plate is an integrally formed planar elastic part.

[0028] The present invention further provides a sound-generating device, comprising a housing and a sound-generating device disposed in the housing, wherein the sound-generating device is any of the above-described sound-generating devices.

[0029] The sound-generating device of the technical solution of the present invention includes a magnetic circuit system and two vibration systems. The magnetic circuit system includes a central magnetic circuit part and a side magnetic circuit part. The two enclose a magnetic gap, so that the first voice coil of the first vibration system and the second voice coil of the second vibration system arranged on both sides thereof can be inserted into the magnetic gap facing each other, realizing a double-sided sound-generating structure in which one magnetic circuit system drives two vibration systems to vibrate, effectively improving the utilization rate of the magnetic circuit system and improving product performance. At the same time, the first voice coil is arranged around the periphery of the second voice coil, that is, the first vibration system and the second vibration system are asymmetric structures due to the asymmetry of the first voice coil and the second voice coil in the plane perpendicular to the vibration direction. In this way, the first voice coil is close to the side magnetic circuit part, and the second voice coil is close to the central magnetic circuit part, and the resistance values ​​of the first voice coil and the second voice coil are set to be the same, and both can obtain the same BL value, thereby ensuring that the first vibration system and the second vibration system achieve consistent acoustic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 It is a structural schematic diagram of an embodiment of a sound-generating device of the present invention;

[0032] Figure 2 for Figure 1 A cross-sectional view of a position of the sound-generating device shown;

[0033] Figure 3 for Figure 1 An exploded view of the sound generating device shown;

[0034] Figure 4 for Figure 1 A cross-sectional view of the sound-generating device at another position;

[0035] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0036] Figure 6 for Figure 1 A cross-sectional view of a first voice coil winding structure in the sound-generating device;

[0037] Figure 7 for Figure 1 A cross-sectional view of a second voice coil winding structure in the sound-generating device;

[0038] Figure 8 for Figure 1A simulated cloud diagram of the magnetic circuit system in the sound-generating device shown;

[0039] Fig. 9 is an amplitude curve diagram of the sound-generating device of the present invention;

[0040] Fig.10 It is a sensitivity curve diagram of the sound-generating device of the present invention.

[0041] Description of Figure Numbers:

[0042]

[0043]

[0044] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0045] 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.

[0046] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) 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.

[0047] 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.

[0048] 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.

[0049] The invention provides a sound generating device.

[0050] Please refer to Figures 1 to 4 In one embodiment of the present invention, the sound generating device 100 provided by the present invention comprises a magnetic circuit system 20, a first vibration system 30, and a second vibration system 40, wherein the magnetic circuit system 20 comprises a central magnetic circuit portion 22 and a side magnetic circuit portion 23, and a magnetic gap 20a is formed between the central magnetic circuit portion 22 and the side magnetic circuit portion 23;

[0051] The first vibration system 30 includes a first diaphragm 31 and a first voice coil 32; the second vibration system 40 includes a second diaphragm 41 and a second voice coil 42; the first diaphragm 31 and the second diaphragm 41 are respectively installed on two opposite surfaces of the magnetic circuit system 20, the first voice coil 32 is connected to the surface of the first diaphragm 31 facing the magnetic circuit system 20, the second voice coil 42 is connected to the surface of the second diaphragm 41 facing the magnetic circuit system 20, and the first voice coil 32 and the second voice coil 42 are inserted into the magnetic gap 20a facing each other;

[0052] The first voice coil 32 is arranged on the periphery of the second voice coil 42, the second voice coil 42 is arranged close to the central magnetic circuit part 22, the first voice coil 32 is arranged close to the side magnetic circuit part 23, the resistance value of the first voice coil 32 and the second voice coil 42 is the same, and the BL value of the magnetic circuit system 20 acting on the first vibration system 30 is the same as the BL value of the magnetic circuit system 20 acting on the second vibration system 40.

[0053] In this embodiment, the magnetic circuit system 20 includes a central magnetic circuit portion 22 and a side magnetic circuit portion 23, and a magnetic gap 20a is formed therebetween. The magnetic gap 20a here can be a through space or two unconnected spaces, which is not limited here.

[0054] The two vibration systems are respectively the first vibration system 30 and the second vibration system 40. The edges of the first diaphragm 31 and the second diaphragm 41 are connected to the two opposite surfaces of the magnetic circuit system 20. One end of the first voice coil 32 is connected to the first diaphragm 31, and the other end is suspended from the top in the magnetic gap 20a. One end of the second voice coil 42 is connected to the second diaphragm 41, and the other end is suspended from the bottom in the magnetic gap 20a. The up and down positions here refer to placing the first vibration system 30 upward and the second vibration system 40 toward the ground when the sound-generating device 100 is placed on a horizontal plane. After the two voice coils are connected to the external circuit, current is introduced into the magnetic circuit system 20 to form a magnetic field, driving the first voice coil 32 and the second voice coil 42 to move in the magnetic gap 20a, so as to drive the diaphragm to vibrate and realize double-sided sound generation.

[0055] Here, the first voice coil 32 is arranged around the periphery of the second voice coil 42, that is, the outer diameter of the first voice coil 32 is greater than the outer diameter of the second voice coil 42. The second voice coil 42 is arranged close to the central magnetic circuit portion 22, and the first voice coil 32 is arranged close to the side magnetic circuit portion 23. The closeness here is relative to the midline between the central magnetic circuit portion 22 and the side magnetic circuit portion 23. When the distance from the central magnetic circuit portion 22 is less than the midline, it means that it is close to the central magnetic circuit portion 22, and when the distance from the side magnetic circuit portion 23 is less than the midline, it means that it is close to the side magnetic circuit portion 23. Specifically, in the horizontal projection, the first voice coil 32 may have no overlapping area with the second voice coil 42, or the two may have a partially overlapping structure, as long as it is ensured that the two voice coils do not interfere with each other on the motion trajectory when vibrating. At the same time, in the vertical projection, the first voice coil 32 may have no overlapping area with the second voice coil 42, or the two may have a partially overlapping structure, as long as it is ensured that the two voice coils do not interfere with other components when vibrating. At this time, the two vibration systems are asymmetrically arranged with respect to the horizontal mid-vertical plane of the magnetic circuit system 20. In this embodiment, the inner diameter of the first voice coil 32 is larger than the outer diameter of the second voice coil 42, so as to achieve complete misalignment, and the height distance between the two voice coils can be relatively reduced, so as to achieve a thinner product of the sound-generating device 100.

[0056] At the same time, the first voice coil 32 and the second voice coil 42 have the same resistance value, for example, the wire length and diameter of the two are the same; or the diameter of the one with the longest wire length is also larger. Of course, the same resistance value here means that there can be a certain processing tolerance, and it is enough to achieve basically the same. And the BL value generated by the first vibration system 30 under the action of the magnetic circuit system 20 is the same as the BL value generated by the second vibration system 40 under the action of the magnetic circuit system 20. Here, the BL value is the electromechanical coupling factor, also called the force coefficient, which is determined by the magnetic circuit Bg value and the effective length L of the voice coil line. Therefore, when one of the first voice coil 32 and the second voice coil 42 has a larger winding length, the magnetic induction intensity of the magnetic circuit system 20 acting on it can be smaller, or when the winding lengths of the two are the same, the magnetic induction intensity of the magnetic circuit system 20 acting on it can be the same, which is not limited here. The same BL value here can also be basically the same with tolerance.

[0057] The sound-generating device 100 of the technical solution of the present invention includes a magnetic circuit system 20 and two vibration systems. The magnetic circuit system 20 includes a central magnetic circuit part 22 and a side magnetic circuit part 23, which together form a magnetic gap 20a, so that the first voice coil 32 in the first vibration system 30 and the second voice coil 42 in the second vibration system 40 arranged on both sides of the magnetic circuit system 20 can be inserted into the magnetic gap 20a facing each other, realizing a double-sided sound-generating structure in which one magnetic circuit system 20 drives two vibration systems to vibrate, effectively improving the utilization rate of the magnetic circuit system 20 and improving product performance. At the same time, the first voice coil 32 is arranged on the periphery of the second voice coil 42, that is, the first vibration system 30 and the second vibration system 40 are asymmetrical structures because the first voice coil 32 and the second voice coil 42 are asymmetrical in the plane perpendicular to the vibration direction. In this way, the first voice coil 32 is close to the side magnetic circuit part 23, and the second voice coil 42 is close to the center magnetic circuit part 22. At the same time, the resistance values ​​of the first voice coil 32 and the second voice coil 42 are set to be the same, and both can obtain the same BL value, thereby ensuring that the first vibration system 30 and the second vibration system 40 achieve consistent acoustic performance.

[0058] In an optional embodiment, the voice coil wire length of the first voice coil 32 is the same as the voice coil wire length of the second voice coil 42 , and the number of winding turns of the first voice coil 32 is less than the number of winding turns of the second voice coil 42 .

[0059] In this embodiment, for the convenience of assembly, the wire lengths of the first voice coil 32 and the second voice coil 42 are set to be the same, so that the two can be wound with the same wire, thereby ensuring that the resistance values ​​of the two are as similar as possible, and saving costs. At the same time, because the outer diameter of the first voice coil 32 is larger and the diameter of the second voice coil 42 is smaller, the number of winding turns of the first voice coil 32 is smaller than the number of winding turns of the second voice coil 42, which can be determined according to the spacing between the first voice coil 32 and the second voice coil 42 and the central magnetic circuit part 22 and the side magnetic circuit part 23, respectively. After the current is passed, an equal amount of magnetic lines of force can be generated, and then the first vibration system 30 and the second vibration system 40 can be driven in the same manner, so that the BL values ​​obtained by the two can be ensured to be the same, and then the two sides of the sound-generating device 100 can obtain more consistent acoustic performance.

[0060] In one embodiment, the central magnetic circuit portion 22 includes a central magnet 221, a first central magnetic yoke 222 and a second central magnetic yoke 223 disposed on two opposite surfaces of the central magnet 221; the side magnetic circuit portion 23 includes a side magnet 231, a first side magnetic yoke 232 and a second side magnetic yoke 233 disposed on the side magnet 231;

[0061] The width of the first central magnetic yoke 222 is greater than the width of the central magnet 221 , the first central magnetic yoke 222 extends toward the first voice coil 32 , and the central axis of the first central magnetic yoke 222 coincides with the central axis of the central magnet 221 .

[0062] In this embodiment, the central magnetic circuit portion 22 includes a central magnet 221, a first central magnetic yoke 222, and a second central magnetic yoke 223. The central magnet 221 can be connected to the two by bonding, thereby forming a stable connection structure. The first central magnetic yoke 222 and the second central magnetic yoke 223 jointly enhance the magnetic effect of the central magnetic circuit portion 22. At the same time, the side magnetic circuit portion 23 includes a side magnet 231, a first side magnetic yoke 232, and a second side magnetic yoke 233. The first side magnetic yoke 232 and the second side magnetic yoke 233 are respectively arranged on the two surfaces of the side magnet 231, further enhancing the amount of magnetic lines of force of the side magnet 231 and reducing magnetic leakage, thereby ensuring the driving effect of the magnetic gap 20a, so as to improve the acoustic performance of the first vibration system 30 and the second vibration system 40. Here, the side magnet 231 is a split structure, that is, a short side magnet 231 is arranged on the short side of the sound-generating device 100, and a long side magnet 231 is arranged on its long side, so that other structures can be avoided. At the same time, according to the length setting of the sound-generating device 100, the long side magnet 231 can also be set into two sections, which is convenient for processing and can also avoid other structures, such as sound holes. Optionally, the second side magnetic yoke 233 can be set as an integrated structure to form a stable support structure, which can provide stable support force for the side magnet 231. The first central magnetic yoke 222, the second central magnetic yoke 223, the first side magnetic yoke 232 and the second side magnetic yoke 233 are all made of magnetic conductive materials, such as iron, nickel, cobalt, etc., which can fix the central magnet 221 and the side magnet 231 while guiding their magnetic lines of force, thereby improving the driving effect on the vibration system.

[0063] At the same time, the width of the first central magnetic yoke 222 is greater than the width of the central magnet 221, that is, in the width direction, the outer edge of the first central magnetic yoke 222 protrudes from the outer edge of the central magnet 221; and the central axis of the first central magnetic yoke 222 coincides with the central axis of the central magnet 221, so that the magnetic lines of force in the magnetic gap 20a are relatively uniform, and the magnetic lines of force of the central magnet 221 can be conveniently guided into the magnetic gap 20a and to the first voice coil 32 away from the central magnet 221, thereby improving the driving force for the first voice coil 32. Optionally, the cross-sectional area of ​​the second central magnetic yoke 223 can be slightly larger than the cross-sectional area of ​​the central magnet 221, thereby improving the driving effect on the second voice coil 42.

[0064] Please refer to Figure 4 and Figure 5In one embodiment, the distance between the outer circumference of the first voice coil 32 and the side magnet 231 is L1, and the distance between the inner circumference and the center magnet 221 is L2, wherein the range of L1 / L2 is 1 / 6 to 1 / 3;

[0065] And / or, the distance between the outer circumference of the second voice coil 42 and the side magnet 231 is L3, and the distance between the inner circumference and the center magnet 221 is L4, wherein the range of L4 / L3 is 1 / 6 to 1 / 3.

[0066] In this embodiment, the first voice coil 32 is close to the side magnet 231, so the distance between it and the side magnet 231 is small, and the distance between it and the center magnet 221 is large. Therefore, the ratio L1 / L2 of the distance between the first voice coil 32 and the two should be less than or equal to 1. Of course, in order to save and reasonably utilize the magnetic gap 20a, the ratio should not be too small. Here, the range of L1 / L2 is set to 1 / 6 to 1 / 3, for example, 1 / 6, 1 / 5, 2 / 9, 1 / 4, 5 / 18, 1 / 3, etc. On the basis of the asymmetric structure, the space of the magnetic gap 20a can be reasonably utilized, and the same magnetic line value can be obtained as much as possible under different numbers of winding coils, so that the same vibration driving force of the first vibration system 30 and the second vibration system 40 can be achieved to ensure the same acoustic performance.

[0067] Similarly, the ratio L4 / L3 of the distance L4 between the second voice coil 42 and the center magnet 221 and the distance L3 between the second voice coil 42 and the side magnet 231 is also set to a range of 1 / 6 to 1 / 3, such as 1 / 6, 1 / 5, 2 / 9, 1 / 4, 5 / 18, 1 / 3, etc., so as to facilitate assembly and save space in the magnetic gap 20a, thereby effectively ensuring the consistency of the magnetic line values ​​of the first voice coil 32 and the second voice coil 42.

[0068] In one embodiment, the distance between the first central magnetic yoke 222 and the first voice coil 32 is equal to the distance between the first side magnetic yoke 232 and the first voice coil 32;

[0069] The distance between the second side magnetic conductive yoke 232 and the second voice coil 42 is greater than the distance between the second center magnetic conductive yoke 222 and the second voice coil 42 .

[0070] In this embodiment, since the first central magnetic yoke 222 extends beyond the edge of the central magnet 221 by a certain distance, the distances between the first voice coil 32 and the first central magnetic yoke 222 and the first side magnetic yoke 232 are set equal, thereby improving the vibration stability of the first voice coil 32 and improving the acoustic effect.

[0071] Similarly, since the second voice coil 42 is close to the center magnet 221, the width of the second center magnetic yoke 223 is approximately the same as that of the center magnet 221. The magnetic field strength received by the second voice coil 42 is relatively large, and there is no need for the second side magnetic yoke 233 to guide more magnetic field lines thereto. Therefore, the width of the second side magnetic yoke 233 can be set to be approximately the same as that of the side magnet 231, thereby saving materials and reducing the weight of the sound-generating device 100, which is conducive to lightweighting.

[0072] In one embodiment, a ratio of the number of winding turns Q2 of the second voice coil 42 to the number of winding turns Q1 of the first voice coil 32 is greater than 1 and less than 1.3.

[0073] In this embodiment, when the first voice coil 32 and the second voice coil 42 are at appropriate positions of the magnetic gap 20a, for example, within the above-mentioned ratio range, the consistency of the magnetic field lines of the two can be further improved by combining the ratio of the number of windings of the two. Since the diameter of the first voice coil 32 is relatively large, the number of windings of the first voice coil 32 should be smaller than the number of windings of the second voice coil 42. Therefore, the ratio of Q2 of the second voice coil 42 to Q1 of the first voice coil 32 is greater than 1. Of course, the ratio range should not be too large, otherwise it will affect the distance between the two and the central magnetic circuit part 22 and the side magnetic circuit part 23, and the size of the magnetic gap 20a will be too large, which is not conducive to the miniaturization of the volume. Here, the ratio range of Q2 / Q1 is set to 1 to 1.3, for example, 1.1, 1.15, 1.2, 1.25, etc. At this time, the number of windings of the first voice coil 32 can be set to 30, and the number of windings of the second voice coil 42 can be set to 34, which ensures good performance consistency and is conducive to the miniaturization of the product.

[0074] Please continue to refer to Figure 4 and Figure 5 In one embodiment, a first protrusion 321 formed by winding is provided on the free end of the first voice coil 32 facing the side magnetic circuit portion 23; a second protrusion 421 formed by winding is provided on the free end of the second voice coil 42 facing the side magnetic circuit portion 23.

[0075] In this embodiment, in order to obtain a better magnetic driving force, a first protrusion 321 is provided at the free end of the first voice coil 32, and the first protrusion 321 is provided toward the side magnetic circuit portion 23, that is, the diameter of the free end of the first voice coil 32 is larger than the diameter of the end thereof close to the first diaphragm 31, so that more current is introduced into the magnetic gap 20a, which can improve the problem of uneven magnetic lines of force of the magnetic circuit system 20, thereby obtaining a more uniform magnetic line of force value, and further improving the stability and consistency of vibration. Similarly, a second protrusion 421 is also provided on the side of the free end of the second voice coil 42 toward the side magnetic circuit portion 23, which can also improve the distribution of magnetic lines of force, so as to obtain a uniform magnetic line of force value, and achieve the same sound performance of the two vibration systems. Here, the first protrusion 321 and the second protrusion 421 are both formed by windings with different numbers of turns from other parts.

[0076] Please combine Figure 6 and Figure 7 In one embodiment, the first voice coil 32 is wound with N layers of coils in the radial direction thereof, wherein N is a natural number and N is greater than or equal to 3, the outermost coil is the Nth layer coil, the height of the Nth layer coil and the N-1th layer coil is less than the height of the N-2th layer coil and the coils within the N-2th layer coil, and the Nth layer and N-1th layer coil form the first protrusion 321;

[0077] And / or, the second voice coil 42 is wound with M layers of coils in its radial direction, wherein M is a natural number and M is greater than or equal to 3, the outermost coil is the Mth coil, the height of the Mth coil is less than the height of the M-1th coil and the coils within the M-1th coil, and the Mth coil forms the second protrusion 421.

[0078] In this embodiment, in order to further improve the consistency of the acoustic performance of the two vibration systems, the number of winding coils of the first voice coil 32 and the second voice coil 42 is designed, wherein the number of winding layers of the first voice coil 32 is set to N layers, and the outermost two layers of coils of the first voice coil 32 are improved to be smaller than the height of the first voice coil 32 under normal winding. For example, the number of winding layers of the first voice coil 32 is 4 layers, the number of winding coils of the innermost layer and the second inner layer are both 10 turns, the number of winding coils of the outermost layer, i.e., the fourth layer, is 3 turns, and the number of winding coils of the second outer layer, i.e., the third layer, is 7 turns, both of which are smaller than the number of inner winding coils, so that the Nth layer coil forms the above-mentioned first protrusion 321, or the Nth layer and N-1 coils simultaneously form the first protrusion 321, thereby improving the distribution of the magnetic lines of force of the magnetic circuit system 20 through winding, so that the BL curve of the sound-generating device 100 is flatter and has better linearity, thereby reducing the total harmonic distortion.

[0079] At the same time, since the diameter of the second voice coil 42 is smaller than that of the first voice coil 32, the number of winding turns here is greater than that of the first voice coil 32. Therefore, the number of winding turns of the outermost layer is designed to be only smaller than the height of the second voice coil 42 under normal winding. For example, the second voice coil 42 is wound with 4 layers of coils, the three inner layers have 10 turns, and the outermost layer, i.e., the 4th layer, has 4 turns, which is smaller than the number of winding turns of the inner layers, thereby forming a second protrusion 421. The distribution of the magnetic lines of force in the magnetic gap 20a can also be improved, thereby improving the driving consistency of the first vibration system 30 and the second vibration system 40, so as to achieve the same sound performance of the two.

[0080] Please refer to Figure 5 In one embodiment, the thickness of the first central magnetic conductive yoke 222 is greater than the thickness of the second central magnetic conductive yoke 223, and the ratio of the thickness of the first central magnetic conductive yoke 222 to the thickness of the second central magnetic conductive yoke 223 is in the range of 1 to 1.5.

[0081] In this embodiment, on the basis of this structure, in order to further improve the consistency of the magnetic lines of force of the first voice coil 32 and the second voice coil 42, the thickness of the second center magnetic yoke 223 and the first center magnetic yoke 222 are also designed and improved. The thickness of the first center magnetic yoke 222 is made greater than the thickness of the second center magnetic yoke 223, thereby improving the magnetic conductivity of the first center magnetic yoke 222. More magnetic lines of force of the center magnet 221 can be led to the first voice coil 32 to ensure the consistency of the magnetic lines of force of the two voice coils. On the basis of achieving the same resistance value of the first voice coil 32 and the second voice coil 42 through the design of the position and the number of windings, the uniform magnetic lines of force of the two are arranged, which can further improve the consistency of the acoustic performance of the first vibration system 30 and the second vibration system 40.

[0082] Optionally, the magnetic circuit system further includes two connecting parts 21 , and on the short axis side of the sound-generating device 100 , the first center magnetic yoke 222 and the second side magnetic yoke 233 are connected into an integrated structure by the connecting parts 21 .

[0083] In this embodiment, the two connecting parts 21 are connected to the short edge of the first central magnetic yoke 222, so that the magnetic gap 20a formed by the long side of the central magnetic circuit part 22 and the side magnetic circuit part 23 is in a connected state, which can reduce the probability of the magnetic lines of force being conducted to the outside, ensure the magnetic induction intensity of the magnetic gap 20a, and can increase the volume of the side magnetic circuit part 23 and the central magnetic circuit part 22 when the space of the magnetic gap 20a is increased, and then can further improve the magnetic induction intensity and driving effect. The two connecting parts 21 can be plate-shaped or strip-shaped, which is not limited here. The first central magnetic yoke 222 and the second side magnetic yoke 233 and the connecting part 21 are an integrally formed structure, which facilitates the assembly of the sound-generating device 100, and can ensure its own structural strength and improve the stability of the structure of the sound-generating device 100. The shape of the first central magnetic yoke 222 can be a rectangular plate, and the second side magnetic yoke 233 is an integral annular plate, so as to match the rectangular shape of the magnetic circuit system 20 and improve the utilization of space. Of course, in other embodiments, when the shape of the magnetic circuit system 20 is a cylinder or other shapes, the shapes of the first central magnetic yoke 222 and the second side magnetic yoke 233 can match it, and also be disc-shaped or other shapes.

[0084] Please refer to Figure 8 and Fig. 9 and Fig.10 The structure of the sound generating device 100 is set according to the above embodiment, the number of turns of the first voice coil 32 is set to 30, and the winding method is as above, the number of turns of the second voice coil 42 is set to 34, and the winding method is as above, the distance ratio between the first voice coil 32 and the central magnetic circuit part 22 and the side magnetic circuit part 23 is set to the above ratio range, that is, 1 / 6 to 1 / 3, here optionally, 1 / 5, the distance ratio between the second voice coil 42 and the central magnet 221 and the side magnet 231 is set to 1 / 5, and the thickness of the second central magnetic yoke 223 and the first central magnetic yoke 222 is designed as above The magnetic circuit system 20 of the sound-emitting device 100 is simulated. It can be seen from the simulation cloud map that the magnetic lines of force obtained by the first vibration system 30 and the second vibration system 40 are evenly distributed, which can provide a basis for the consistency of its acoustic performance. Then the amplitude test and the sensitivity test are carried out. It is assumed that the side of the first vibration system 30 is the A side of the sound-emitting device 100, and the side of the second vibration system 40 is the B side of the sound-emitting device 100. It can be concluded from the figure that the A side and the B side of the sound-emitting device 100 with an asymmetric voice coil structure can obtain the same amplitude, and the sensitivity is also highly consistent.

[0085] In one embodiment, the first vibration system 30 and the magnetic circuit system 20 form a first sound generating unit, and the second vibration system 40 and the magnetic circuit system 20 form a second sound generating unit;

[0086] The first sound emitting unit and the second sound emitting unit have the same vibration system force compliance and / or amplitude; and / or the first sound emitting unit and the second sound emitting unit have the same resonance frequency and / or frequency response.

[0087] Here, the first vibration system 30 of the present application and the magnetic circuit system 20 form a first sound unit, and the second vibration system 40 and the magnetic circuit system 20 form a second sound unit. It should be noted that the vibration system force compliance (Cms, which is a key factor affecting resonance and low-frequency response) of the first sound unit and the second sound unit on both sides of the sound-emitting device 100 of the present application is the same, or the amplitude of the two is the same, or the vibration system force compliance and amplitude of the two are the same, which is determined by Fig. 9 This can also be seen in the amplitude test.

[0088] Based on the above structure, the resonance frequency (F0) of the first sound unit and the second sound unit is the same, or the frequency response (FR) of the two is the same, or the resonance frequency (F0) and the frequency response (FR) of the two are the same, which can be achieved by Fig.10 It can also be seen from the sensitivity test curve in that the first sound unit and the second sound unit have the same acoustic performance, that is, the sound device 100 has the same sound effect on both sides.

[0089] The above-mentioned similarity is not limited to being completely identical in numerical value, and a certain tolerance may be allowed.

[0090] Please continue to refer to Figure 2 and Figure 3 In one embodiment, the sound-generating device further comprises a housing assembly 10, wherein the housing assembly 10 comprises a first housing 11 and a second housing 12 connected to each other, wherein the first vibration system 30 is disposed on a surface of the first housing 11 away from the second housing 12, and the second vibration system 40 is disposed on a surface of the second housing 12 away from the first housing 11;

[0091] The first diaphragm 31 includes a first central portion 311 and a first folded ring portion 312, and the second diaphragm 41 includes a second central portion 411 and a second folded ring portion 412. The outer periphery of the first folded ring portion 312 is connected to the outer edge of the first shell 11, and the inner periphery is connected to the first central portion 311. The outer periphery of the second folded ring portion 412 is connected to the outer edge of the second shell 12, and the inner periphery is connected to the second central portion 411. The first folded ring portion 312 and the second folded ring portion 412 are both recessed in a direction away from the magnetic circuit system 20.

[0092] In this embodiment, the shell assembly 10 is used to fix the vibration system and the magnetic circuit system 20, plays a certain supporting role, and is used to fix the sound-generating device 100 to the product to which it is applied. The material of the shell assembly 10 can be a plastic part, which is convenient for processing and has good structural stability. The shell assembly 10 can be a split structure or an integrally molded structure, which is not limited here. The shell assembly 10 is generally flat. On the basis that the magnetic circuit system 20 is arranged on the shell assembly 10, and the two vibration systems are respectively located on both sides of the magnetic circuit system 20, it can ensure that the overall thickness of the sound-generating device 100 is not too large, thereby reducing the occupied space and facilitating miniaturization. The cross-sectional shape of the shell assembly 10 can be circular, square or polygonal, etc., which is not limited here and can be set as needed.

[0093] The shell assembly 10 includes a first shell 11 and a second shell 12 that are detachably connected, so as to facilitate the assembly of the internal magnetic circuit system 20. The connection method between the two can be snap-fit, bonding or welding, etc., which is not limited here. Specifically, the first shell 11 is arranged in an annular shape, and its outer periphery can be used to fix the first vibration system 30, the second side magnetic yoke 233 and the second shell 12. And the inner periphery is connected to the first side magnetic yoke 232, so as to guide the magnetic lines of force of the opposite side magnet 231, enhance the strength of the magnetic lines of force, and ensure the driving effect. Here, optionally, the material of the first side magnetic yoke 232 is conductive metal, and the material of the first shell 11 can be plastic. The two can be integrally injection molded, so as to effectively ensure the structural strength and stability, and facilitate processing.

[0094] The second housing 12 is also annular, with one side surface being connected to the first housing 11 and the second side magnetic yoke 233, and the other side surface being connected to the second vibration system 40. The second side magnetic yoke 233 is connected to the first housing 11 and the second housing 12, respectively, thereby improving the stability of the overall structure of the sound generating device 100.

[0095] Here, the first diaphragm 31 includes a first central portion 311 and a first folding ring portion 312, and the second diaphragm 41 includes a second central portion 411 and a second folding ring portion 412. The outer periphery of the first folding ring portion 312 is connected to the outer edge of the first shell 11, and the inner periphery is connected to the first central portion 311. The outer periphery of the second folding ring portion 412 is connected to the outer edge of the second shell 12, and the inner periphery is connected to the second central portion 411. The first folding ring portion 312 and the second folding ring portion 412 are both recessed in the direction away from the magnetic circuit system 20, so as to simplify the structure and avoid interference of the internal structure. It can be understood that the first central portion 311 is planar, the first folding ring portion 312 is a recessed or convex structure, the first folding ring portion 312 is arranged around the first central portion 311, and the side of the first folding ring portion 312 away from the first central portion 311 is connected and fixed to the first shell 11, so as to achieve the installation of the first diaphragm 31, so that it has good deformation ability. The inner edge of the first folded ring portion 312 is connected to the first voice coil 32 and realizes up and down vibration. The first diaphragm 31 of this structure can improve the vibration stability of the first voice coil 32 and keep it moving up and down along its axis.

[0096] Please refer to Figure 2 and Figure 3 In one embodiment, the first vibration system 30 further includes a first support sheet 33, the inner periphery of the first support sheet 33 is clamped between the first voice coil 32 and the inner periphery of the first folding ring portion 312, and the outer periphery is clamped between the outer periphery of the first folding ring portion 312 and the edge of the first shell 11, and the first support sheet 33 is an integrally formed planar elastic member;

[0097] And / or, the second vibration system 40 also includes a second support plate 43, the inner periphery of the second support plate 43 is clamped between the second voice coil 42 and the inner periphery of the second folding ring portion 412, and the outer periphery is clamped between the outer periphery of the second folding ring portion 412 and the edge of the second shell 12, and the second support plate 43 is an integrally formed planar elastic member.

[0098] In order to further ensure the position of the first voice coil 32 in the magnetic gap 20a, ensure that its movement direction only vibrates up and down along its axial direction, and reduce distortion, the sound-generating device 100 also includes a first support 33. The center position of one surface of the first support 33 is connected to the first voice coil 32, the outer periphery is fixed to the housing assembly 10, and the other surface is connected to the edge of the first diaphragm 31. The first support 33 itself also has a certain elastic deformation, so as not to affect the normal vibration of the first voice coil 32. The first support 33 can be set as an integrally formed planar elastic member. Compared with the elastic wave structure, the height of the sound-generating device 100 in its vibration direction can be reduced, thereby reducing the volume of the sound-generating device 100, making it easier to achieve miniaturization of the sound-generating device 100, and significantly improving the structural stability, effectively reducing the risk of breakage.

[0099] Similarly, in order to reduce distortion and ensure the acoustic consistency of the two vibration systems, the sound-generating device 100 further includes a second support 43, the center of one surface of the second support 43 is connected to the second voice coil 42, and the other surface is connected to the edge of the second diaphragm 41. At this time, the outer periphery of the second support 43 is connected to the housing assembly 10, which can provide a good support effect for the second voice coil 42 and improve the structural stability. Here, the structure of the second support 43 can be the same as that of the first support 33, thereby improving the vibration consistency of the two.

[0100] In addition, optionally, in order to facilitate processing and assembly and improve acoustic consistency, the first diaphragm 31 and the second diaphragm 41 are set to have the same cross-sectional size and shape, and the sizes of the center and the folding ring of the two are also the same, so as to further reduce the processing cost. Of course, here, the first folding ring 312 and the second folding ring 412 can also be different in the patterns on their surfaces.

[0101] Please refer to Figure 3 In order to facilitate the fixing of the sound-emitting device 100 and the connection with the external circuit, two first fixed ends 111 are formed on the periphery of the first shell 11, and a corresponding second fixed end 121 is also formed on the periphery of the second shell 12. A flexible circuit board is used for connection, that is, a first flexible circuit board 50 is provided, one end of which is connected to the first support piece 33 and the other end extends to and is fixed at the first fixed end 111. A second flexible circuit board 60 is provided, one end of which is connected to the second support piece 43 and the other end extends to the second fixed end 121, so as to serve as a support point for connection with the external circuit and improve the connection stability.

[0102] The present invention further provides a sound-generating device (not shown), the sound-generating device comprising a housing and a sound-generating device 100 disposed on the housing, the sound-generating device 100 being the above-mentioned sound-generating device 100. Since the sound-generating device 100 of the present sound-generating device adopts all the technical solutions of all the aforementioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the aforementioned embodiments, which will not be described one by one here.

[0103] Here, the sound device can be a speaker, a mobile phone, a headset, etc., which is not limited here. Of course, the sound device can also be used in a vehicle as a vehicle-mounted sound device, a consumer sound device, etc.

[0104] 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. A sound-generating device, characterized in that: The sound-generating device comprises: A magnetic circuit system, the magnetic circuit system comprising a central magnetic circuit portion and a side magnetic circuit portion, wherein a magnetic gap is formed between the central magnetic circuit portion and the side magnetic circuit portion; A first vibration system, the first vibration system comprising a first diaphragm and a first voice coil; and A second vibration system, the second vibration system comprising a second diaphragm and a second voice coil, the first diaphragm and the second diaphragm are respectively arranged on two opposite surfaces of the magnetic circuit system, and the first voice coil and the second voice coil are inserted into the corresponding magnetic gaps facing each other; The first voice coil is arranged on the periphery of the second voice coil, the second voice coil is arranged close to the central magnetic circuit portion, and the first voice coil is arranged close to the side magnetic circuit portion; The resistance values ​​of the first voice coil and the second voice coil are the same, and the BL value of the magnetic circuit system acting on the first vibration system is the same as the BL value of the magnetic circuit system acting on the second vibration system; The central magnetic circuit portion includes a central magnet, a first central magnetic yoke and a second central magnetic yoke disposed on two opposite surfaces of the central magnet; the side magnetic circuit portion includes a side magnet, a first side magnetic yoke and a second side magnetic yoke disposed on the side magnet; wherein the width of the first central magnetic yoke is greater than the width of the central magnet, and the first central magnetic yoke extends toward the direction of the first voice coil; The distance between the second side magnetic yoke and the second voice coil is greater than the distance between the second center magnetic yoke and the second voice coil; The distance between the outer circumference of the first voice coil and the side magnet is L1, and the distance between the inner circumference and the center magnet is L2, wherein the range of L1 / L2 is 1 / 6~1 / 3; And / or, the distance between the outer circumference of the second voice coil and the side magnet is L3, and the distance between the inner circumference and the center magnet is L4, wherein the range of L4 / L3 is 1 / 6 to 1 / 3; The thickness of the first central magnetic conductive yoke is greater than the thickness of the second central magnetic conductive yoke, and the ratio of the thickness of the first central magnetic conductive yoke to the thickness of the second central magnetic conductive yoke is in a range of 1 to 1.

5.

2. The sound-generating device according to claim 1, characterized in that: The voice coil wire length of the first voice coil is the same as the voice coil wire length of the second voice coil, and the number of winding turns of the first voice coil is smaller than the number of winding turns of the second voice coil.

3. The sound generating device according to claim 1, characterized in that: The central axis of the first central magnetic yoke coincides with the central axis of the central magnet.

4. The sound-generating device according to claim 3, characterized in that: The distance between the first central magnetic yoke and the first voice coil is equal to the distance between the first side magnetic yoke and the first voice coil.

5. The sound generating device according to any one of claims 2 to 4, characterized in that: The ratio of the number of winding coils Q2 of the second voice coil to the number of winding coils Q1 of the first voice coil is greater than 1 and less than 1.

3.

6. The sound generating device according to any one of claims 1 to 4, characterized in that: A first protrusion formed by winding is provided on a side of the free end of the first voice coil facing the side magnetic circuit portion; a second protrusion formed by winding is provided on a side of the free end of the second voice coil facing the side magnetic circuit portion.

7. The sound generating device according to claim 6, characterized in that: The first voice coil is wound with N layers of coils in the radial direction thereof, wherein N is a natural number and is greater than or equal to 3, the outermost coil is the Nth layer coil, the height of the Nth layer coil and the N-1th layer coil is less than the height of the N-2th layer coil and the coils within the N-2th layer coil, and the Nth layer and the N-1th layer coil form the first protrusion; And / or, the second voice coil is wound with M layers of coils in its radial direction, wherein M is a natural number and M is greater than or equal to 3, the outermost coil is the Mth coil, the height of the Mth coil is less than the height of the M-1th coil and the coils within the M-1th coil, and the Mth coil forms the second protrusion.

8. The sound generating device according to any one of claims 3 to 4, characterized in that: The magnetic circuit system further includes two connecting parts, and on the short axis side of the sound generating device, the first central magnetic yoke and the second side magnetic yoke are connected into an integral structure by the connecting parts.

9. The sound generating device according to any one of claims 1 to 4, characterized in that: The first vibration system and the magnetic circuit system form a first sound-generating unit, and the second vibration system and the magnetic circuit system form a second sound-generating unit; Wherein, the first sound emitting unit and the second sound emitting unit have the same vibration system force compliance and / or amplitude; and / or, the first sound emitting unit and the second sound emitting unit have the same resonance frequency and / or frequency response.

10. The sound generating device according to any one of claims 1 to 4, characterized in that: The sound-generating device further comprises a shell assembly, wherein the shell assembly comprises a first shell and a second shell connected to each other, wherein the first vibration system is arranged on a surface of the first shell facing away from the second shell, and the second vibration system is arranged on a surface of the second shell facing away from the first shell; The first diaphragm includes a first central portion and a first folding ring portion, and the second diaphragm includes a second central portion and a second folding ring portion. The outer periphery of the first folding ring portion is connected to the outer edge of the first shell, and the inner periphery is connected to the first central portion. The outer periphery of the second folding ring portion is connected to the outer edge of the second shell, and the inner periphery is connected to the second central portion. Both the first folding ring portion and the second folding ring portion are recessed in a direction away from the magnetic circuit system.

11. The sound generating device according to claim 10, characterized in that: The first vibration system further includes a first support, wherein the inner periphery of the first support is clamped between the first voice coil and the inner periphery of the first folding ring, and the outer periphery of the first support is clamped between the outer periphery of the first folding ring and the edge of the first shell, and the first support is an integrally formed planar elastic member; And / or, the second vibration system also includes a second support plate, the inner periphery of the second support plate is clamped between the second voice coil and the inner periphery of the second folding ring part, and the outer periphery is clamped between the outer periphery of the second folding ring part and the edge of the second shell, and the second support plate is an integrally formed planar elastic part.

12. A sound-generating device, characterized in that: The sound-generating device comprises a housing and a sound-generating device disposed in the housing, and the sound-generating device is the sound-generating device according to any one of claims 1 to 11.

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