Sound production monomer, sound production module and electronic product

Abstract

The utility model discloses a sounding monomer, a sounding module and an electronic product, the sounding monomer comprises a first sounding unit, a second sounding unit and a magnetic circuit system, the first sounding unit comprises an annular first vibrating diaphragm and a first voice coil connected with the first vibrating diaphragm, and the second sounding unit comprises a second vibrating diaphragm and a second voice coil connected with the second vibrating diaphragm. The second vibrating diaphragm is located at the inner periphery of the first vibrating diaphragm; the magnetic circuit system comprises a central magnetic circuit and a side magnetic circuit located at the periphery of the central magnetic circuit, a first magnetic gap is formed between the central magnetic circuit and the side magnetic circuit, and one side of the first voice coil away from the first diaphragm is inserted into the first magnetic gap; the central magnetic circuit has a second magnetic gap, the second voice coil is a flat voice coil, the axis of the second voice coil extends along a second direction perpendicular to the first direction, and one side of the second voice coil away from the second diaphragm is inserted into the second magnetic gap. The sounding single body integrates the treble and bass sounding modules, so that the mid-bass performance is not reduced, the high-frequency performance is effectively improved, and the sounding frequency band is widened.

Description

Technical Field

[0001] The utility model relates to the field of electroacoustics, and in particular to a sound-generating unit, a sound-generating module and an electronic product. Background Art

[0002] Due to their small size, micro speakers are widely used in modern portable, communication, and smart devices, and users' demand for high sound quality is also increasing. Especially for some portable smart devices, users are no longer satisfied with the presence or absence of sound, but are more pursuing good sound quality.

[0003] A complete micro-sound module consists of a micro-sound unit, front and rear sound chambers, etc. When the micro-speaker is working, the front sound chamber is low-pass filtered. When the driving signal frequency is greater than the front cavity resonance frequency (Fh), the loudness of the speaker drops significantly. At present, the front cavity resonance point of the micro-sound module in smart mobile terminals is mostly less than 6000Hz, which leads to a narrow effective frequency band of the micro-speaker, a relatively monotonous tone, and poor sound quality. Utility Model Content

[0004] The utility model aims to provide a sound-generating unit which can effectively improve the high-frequency performance and broaden the sound-generating frequency band while ensuring that the mid-bass performance is not reduced.

[0005] To achieve the above-mentioned purpose and other purposes, the utility model provides a sound-emitting unit, comprising a first sound-emitting unit, a second sound-emitting unit and a magnetic circuit system, characterized in that the first sound-emitting unit comprises a first annular diaphragm and a first voice coil connected to the first diaphragm, the second sound-emitting unit comprises a second diaphragm and a second voice coil connected to the second diaphragm, the second diaphragm is located at the inner periphery of the first diaphragm, and the first voice coil and the second voice coil both vibrate along a first direction;

[0006] The magnetic circuit system comprises a central magnetic circuit and a side magnetic circuit located at the periphery of the central magnetic circuit, the central magnetic circuit and the side magnetic circuit are arranged at intervals, a first magnetic gap is formed between the central magnetic circuit and the side magnetic circuit, and a side of the first voice coil away from the first diaphragm is inserted into the first magnetic gap;

[0007] The central magnetic circuit has a second magnetic gap, the second voice coil is a flat voice coil with an axis extending along a second direction perpendicular to the first direction, and a side of the second voice coil away from the second diaphragm is inserted into the second magnetic gap.

[0008] Optionally, the central magnetic circuit has a through hole, and the through hole forms the second magnetic gap.

[0009] Optionally, the central magnetic circuit has a first magnetic component, a second magnetic component, a third magnetic component and a fourth magnetic component, and the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component enclose the through hole, and along the second direction, the first magnetic component and the second magnetic component are located on both sides of the second voice coil, and along a third direction respectively perpendicular to the first direction and the second direction, the third magnetic component and the fourth magnetic component are located on both sides of the second voice coil.

[0010] Optionally, the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component are independent structures;

[0011] Alternatively, the first magnetic component and the third magnetic component are integrally formed, and the second magnetic component and the fourth magnetic component are integrally formed;

[0012] Alternatively, the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component are integrally formed.

[0013] Optionally, the central magnetic circuit includes a first magnetic conductive plate, a first magnet, a second magnetic conductive plate and a second magnet stacked in sequence along the first direction, and the second diaphragm is arranged opposite to the first magnetic conductive plate.

[0014] Optionally, the first magnetic conductive plate, the first magnet, the second magnetic conductive plate and the second magnet jointly define the second magnetic gap;

[0015] Alternatively, the first magnetic conductive plate, the first magnet, and the second magnetic conductive plate jointly define the second magnetic gap, and the second magnetic gap is located on a side of the second magnet close to the second diaphragm.

[0016] Optionally, the central magnetic circuit includes a first magnet, a second magnetic conductive plate, and a second magnet stacked in sequence along the first direction, and the second diaphragm is arranged opposite to the first magnet.

[0017] Optionally, the first magnet, the second magnetic conductive plate and the second magnet jointly define the second magnetic gap;

[0018] Alternatively, the first magnet and the second magnetic conductive plate jointly define the second magnetic gap, and the second magnetic gap is located on a side of the second magnet close to the second diaphragm.

[0019] Optionally, the first magnet includes a first magnet, a second magnet and a third magnet magnetized along the first direction; along the second direction, the second magnet and the third magnet are located on one side of the second voice coil, the first magnet is located on the other side of the second voice coil, and the third magnet is located on a side of the second magnet away from the first magnet; the magnetization direction of the first magnet is opposite to that of the second magnet and is the same as that of the third magnet;

[0020] The second magnet includes a fourth magnet and a fifth magnet which are magnetized along the first direction and have the same magnetization direction. Along the second direction, the fourth magnet and the fifth magnet are respectively located on both sides of the second voice coil. The magnetization directions of the first magnet and the fourth magnet are opposite.

[0021] Optionally, the first diaphragm includes an annular first reinforcement portion, an annular first fold ring and an annular second fold ring, the outer periphery and inner periphery of the first reinforcement portion are respectively connected to the inner periphery of the first fold ring and the outer periphery of the second fold ring, and the first voice coil is connected to a side of the first reinforcement portion close to the first magnetic gap.

[0022] Optionally, the second diaphragm includes a second reinforcement portion and a third fold ring, the second voice coil is connected to a side of the second reinforcement portion close to the second magnetic gap, and the second reinforcement portion is connected to an inner periphery of the third fold ring;

[0023] Alternatively, the second diaphragm is a planar diaphragm;

[0024] Alternatively, the second diaphragm includes a planar diaphragm and a second reinforcement portion fixed on the planar diaphragm.

[0025] In order to achieve the above-mentioned purpose and other purposes, the utility model further provides a sound module, which includes a shell and the above-mentioned sound unit located in the shell.

[0026] In order to achieve the above-mentioned purpose and other purposes, the utility model also provides an electronic product, which includes the above-mentioned sound module; or, the electronic product includes the above-mentioned sound unit.

[0027] The technical effect of the utility model at least lies in that the sound-emitting unit of the utility model includes a first sound-emitting unit, a second sound-emitting unit and a magnetic circuit system, the first sound-emitting unit includes a first annular diaphragm and a first voice coil connected to the first diaphragm, the second sound-emitting unit includes a second diaphragm and a second voice coil connected to the second diaphragm, the second diaphragm is located at the inner periphery of the first diaphragm, and the first voice coil and the second voice coil both vibrate along a first direction; the magnetic circuit system includes a central magnetic circuit and a side magnetic circuit located at the periphery of the central magnetic circuit, the central magnetic circuit and the side magnetic circuit are arranged at intervals, a first magnetic gap is formed between the central magnetic circuit and the side magnetic circuit, and a side of the first voice coil away from the first diaphragm is inserted into the first magnetic gap; the central magnetic circuit has a second magnetic gap, the second voice coil is a flat voice coil and the axis extends along a second direction perpendicular to the first direction, and a side of the second voice coil away from the second diaphragm is inserted into the second magnetic gap. The first sound unit is a woofer, and the second sound unit is a tweeter. The high and low frequency sound modules are integrated together to ensure that the mid-bass performance is not reduced while effectively improving the high frequency performance and widening the sound frequency band. In addition, the second voice coil is a flat voice coil, which is inserted into the second magnetic gap inside the center magnetic circuit to effectively increase the driving force and thus improve the acoustic performance. The flat voice coil can effectively reduce the product volume.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0030] Figure 1 This is a structural diagram of the sound-emitting unit provided in an embodiment of the utility model.

[0031] Figure 2 This is a bottom structural diagram of the sound unit provided in an embodiment of the utility model.

[0032] Figure 3 A simple exploded diagram of the sound unit provided in an embodiment of the utility model.

[0033] Figure 4 A detailed exploded view of the sound unit provided in an embodiment of the utility model.

[0034] Figure 5 A cross-sectional view of an obliquely placed sound-emitting unit provided in an embodiment of the utility model.

[0035] Figure 6 A cross-sectional view of a sound-emitting unit provided in an embodiment of the utility model when placed forward.

[0036] Figure 7 A cross-sectional view of the magnetic circuit system and the second voice coil of the sound unit provided in an embodiment of the utility model.

[0037] Figure 8 A cross-sectional view of a sound-emitting unit provided in another embodiment of the utility model.

[0038] Fig. 9 A top view of the magnetic circuit system of the sound unit provided in an embodiment of the utility model.

[0039] Fig.10 A top view of the central magnetic circuit and the second voice coil of the sound unit provided in an embodiment of the utility model.

[0040] Fig.11 This is a structural diagram of the first magnet of the sound-emitting unit provided in an embodiment of the utility model.

[0041] Fig.12 A top view of the first magnet of a sound-emitting unit provided in another embodiment of the utility model.

[0042] Fig.13 An exploded diagram of the magnetic circuit system of the sound unit provided in an embodiment of the utility model.

[0043] Fig.14 An exploded view of the magnetic circuit system of a sound unit provided in another embodiment of the utility model.

[0044] Fig.15 This is a bottom structural diagram of the central magnetic circuit and injection molding part of the sound-emitting unit provided in an embodiment of the utility model.

[0045] Fig.16 An exploded view of the electrical connection structure of the second voice coil of the sound unit provided in an embodiment of the utility model.

[0046] Fig.17 A cross-sectional view of a sound-emitting unit provided in an embodiment of the utility model.

[0047] Fig.18 An exploded view of the second diaphragm, the first magnetic conductive plate and the injection molding part of the sound-emitting unit provided in an embodiment of the utility model.

[0048] Fig.19 A cross-sectional view of the magnetic circuit system and the second voice coil of a sound unit provided in another embodiment of the utility model.

[0049] Fig. 20 A cross-sectional view of a sound module provided in an embodiment of the utility model.

[0050] Description of Figure Numbers:

[0051] 10 is a first sound unit, 11 is a first reinforcement part, 12 is a first folding ring, 121 is a first inner fixing part, 122 is a first outer fixing part, 13 is a second folding ring, 131 is a second inner fixing part, 132 is a second outer fixing part, 14 is a first voice coil, 15 is a centering support plate, 20 is a second sound unit, 200 is a planar diaphragm, 21 is a second reinforcement part, 22 is a third folding ring, 221 is a third inner fixing part, 222 is a third outer fixing part, 23 is a second voice coil, 231 is a lead, 24 is an injection molding part, 241 is an electrical connector, 2411 is a welding part, 25 is a fixing ring, 30 is a magnetic circuit system, 31 is a central magnetic circuit, 311 is a first magnetic conductive plate, 3111 is an opening hole, 3112 is a raised ring, 3113 is a recessed portion, 312 is a first magnet, 3121 is a first magnet, 3122 is a second magnet, 3123 is a third magnet, 3124 is a sixth magnet, 3125 is a seventh magnet, 3127 is a missing corner, 313 is a second magnetic conductive plate, 314 is a second magnet, 3141 is a fourth magnet, 3142 is a fifth magnet, 3143 is an eighth magnet, 3144 is a ninth magnet, 315 is an avoidance portion, 316 is an avoidance portion, 32 is a side magnetic circuit, 321 is a side magnetic conductive plate, 322 is a side magnet, 33 is a yoke, 331 is a limiting hole, 332 is a groove, 40 is a shell, 50 is a circuit board, 51 is a welding part, and 60 is an outer shell. DETAILED DESCRIPTION

[0052] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0053] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0054] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0055] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0056] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0057] like Figure 1-Figure 7As shown, the utility model proposes a sound-emitting unit, including a first sound-emitting unit 10, a second sound-emitting unit 20 and a magnetic circuit system 30, wherein the first sound-emitting unit 10 includes a first annular diaphragm and a first voice coil 14 connected to the first diaphragm, the second sound-emitting unit 20 includes a second diaphragm and a second voice coil 23 connected to the second diaphragm, the second diaphragm is located at the inner periphery of the first diaphragm, the first voice coil 14 and the second voice coil 23 both vibrate along a first direction, and the first direction may be a vertical direction; the magnetic circuit system 30 includes a central magnetic circuit 31 and a side magnetic circuit 32 located at the periphery of the central magnetic circuit 31, the central magnetic circuit 31 and the side magnetic circuit 32 are arranged at intervals, a first magnetic gap is formed between the central magnetic circuit 31 and the side magnetic circuit 32, a side of the first voice coil 14 away from the first diaphragm is inserted into the first magnetic gap; the central magnetic circuit 31 has a second magnetic gap, the second voice coil 23 is a flat voice coil and the axis extends along a second direction perpendicular to the first direction, and a side of the second voice coil 23 away from the second diaphragm is inserted into the second magnetic gap. The first diaphragm and the second diaphragm may be coaxially arranged, the first sound unit 10 may be a woofer, and the second sound unit 20 may be a tweeter.

[0058] The sound-emitting unit in the utility model adopts a set of magnetic circuit systems to define magnetic gaps corresponding to the tweeter and the woofer, respectively, that is, the tweeter and the woofer are integrated together, which not only has a compact structure, but also can effectively improve the high-frequency performance and widen the sound frequency band while ensuring that the mid-bass performance is not reduced; in addition, the second voice coil 23 is a flat voice coil, which is inserted into the second magnetic gap inside the central magnetic circuit 31, effectively improving the driving force and thus improving the acoustic performance, and the flat voice coil can effectively reduce the product volume, which contributes to the thin and lightweight design of the product.

[0059] In one embodiment, Fig.10 As shown, the central magnetic circuit 31 has a through hole, and the through hole forms the second magnetic gap. The second magnetic gap adopts a through hole design to facilitate the insertion of the flat second voice coil 23, and both sides of the second voice coil 23 have magnetic circuits, which can provide a higher magnetic field strength for the second voice coil 23.

[0060] Furthermore, if Figure 6As shown, the central magnetic circuit 31 has a first magnetic component, a second magnetic component, a third magnetic component and a fourth magnetic component, the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component enclose the through hole, along the second direction, for example, the second direction can be a horizontal short side direction, the first magnetic component and the second magnetic component are located on both sides of the second voice coil 23, along the third direction perpendicular to the first direction and the second direction, for example, the third direction can be a horizontal long side direction, the third magnetic component and the fourth magnetic component are located on both sides of the second voice coil 23. The above four magnetic components include magnets, the magnets can be one or two or even more, two or more magnets are arranged along the first direction; the magnetic component also includes a magnetic conductive plate, a magnetic conductive plate is sandwiched between two adjacent magnets, so as to guide the magnetic lines of force to pass through the second voice coil 23 more concentratedly.

[0061] Furthermore, the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component are independent structures, that is, the multiple magnetic components are relatively independent and can be assembled flexibly; or, the first magnetic component and the third magnetic component are integrally formed, and the second magnetic component and the fourth magnetic component are integrally formed, for example, the two magnetic components are combined into an L shape (the two magnetic components can be arranged vertically), and the two L-shaped structures are enclosed to form a through hole, thereby reducing assembly complexity and improving assembly accuracy and speed; or, the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component are integrally formed, and this design can further improve assembly accuracy and speed and improve assembly efficiency.

[0062] In another embodiment, the central magnetic circuit 31 includes two magnetic components, the two magnetic components are spaced apart to form the second magnetic gap, and the two magnetic components are disposed along the second direction on both sides of the second voice coil 23. In this way, the magnetic components on both sides of the second voice coil 23 along the third direction can be saved, the cost can be reduced, and the structure is simpler.

[0063] In one embodiment, Figure 6 As shown, the central magnetic circuit 31 includes a first magnetic conductive plate 311, a first magnet 312, a second magnetic conductive plate 313 and a second magnet 314 stacked in sequence along the first direction, the second diaphragm is arranged opposite to the first magnetic conductive plate 311, a second magnetic gap is opened in the middle of the central magnetic circuit 31, and the side of the second voice coil 23 away from the second diaphragm is inserted into the second magnetic gap. Specifically, the first magnetic conductive plate 311, the first magnet 312, the second magnetic conductive plate 313 and the second magnet 314 jointly define the second magnetic gap, that is, the first magnetic conductive plate 311, the first magnet 312, the second magnetic conductive plate 313 and the second magnet 314 are sequentially penetrated to form the second magnetic gap, so that a larger vibration space can be obtained;

[0064] Or, if Fig.19 As shown, the first magnetic conductive plate 311, the first magnet 312 and the second magnetic conductive plate 313 jointly define the second magnetic gap, and the second magnetic gap is located on the side of the second magnet 314 close to the second diaphragm, that is, the first magnetic conductive plate 311, the first magnet 312 and the second magnetic conductive plate 313 are sequentially penetrated to form the second magnetic gap, and the second magnet 314 covers the second magnetic gap. The second magnet 314 does not need to leave a gap, which is convenient for assembly. The gap of the first magnetic conductive plate 311 constitutes an upper magnetic gap, and the gap of the second magnetic conductive plate 313 constitutes a lower magnetic gap. The second voice coil 23 has an upper driving edge and a lower driving edge, the upper driving edge is located in the upper magnetic gap, and the lower driving edge is located in the lower magnetic gap. The central magnetic circuit 31 drives the upper driving edge and the lower driving edge of the second voice coil 23 at the same time, which can obtain a stronger driving force and improve the acoustic performance of the product.

[0065] In a specific example, the second diaphragm is located above the first magnetic conductive plate 311, and a fixing ring 25 is provided above the edge of the first magnetic conductive plate 311. The second diaphragm is located on the fixing ring 25. The fixing ring 25 expands the distance between the second diaphragm and the first magnetic conductive plate 311 to provide a deformation space for the second diaphragm to vibrate downward. The outer edge of the fixing ring 25 is aligned with the outer edge of the first magnetic conductive plate 311 to facilitate assembly. In another example, the edge of the first magnetic conductive plate 311 protrudes upward to form a raised ring 3112, and the second diaphragm is fixed to the raised ring 3112. The raised ring 3112 also provides a deformation space for the second diaphragm to vibrate downward. The raised ring 3112 is a part of the first magnetic conductive plate 311, thereby eliminating the installation of the fixing ring 25 and improving assembly accuracy and efficiency.

[0066] In another embodiment, Figure 8As shown, the central magnetic circuit 31 includes a first magnet 312, a second magnetic conductive plate 313, and a second magnet 314 stacked in sequence along the first direction, and the second diaphragm is arranged opposite to the first magnet 312. A gap is opened in the middle of the central magnetic circuit 31, and the second voice coil 23 is inserted into the gap on the side away from the second diaphragm. That is, the first magnet 312, the second magnetic conductive plate 313, and the second magnet 314 jointly define the second magnetic gap, that is, the first magnet 312, the second magnetic conductive plate 313, and the second magnet 314 are sequentially penetrated to form the second magnetic gap, and a larger vibration space can be obtained; or, the first magnet 312 and the second magnetic conductive plate 313 jointly define the second magnetic gap, and the second magnetic gap is located on the side of the second magnet 314 close to the second diaphragm, that is, the first magnet 312 and the second magnetic conductive plate 313 are sequentially penetrated to form the second magnetic gap, and the second magnet 314 covers the second magnetic gap, and the second magnet 314 does not need to leave a gap, which is convenient for assembly. The gap of the first magnet 312 constitutes an upper magnetic gap, the gap of the second magnetic conductive plate 313 constitutes a lower magnetic gap, the second voice coil 23 has an upper driving edge and a lower driving edge, the upper driving edge is located in the upper magnetic gap, and the lower driving edge is located in the lower magnetic gap. The central magnetic circuit 31 drives the upper driving edge and the lower driving edge of the second voice coil 23 at the same time, which can obtain a stronger driving force and improve the acoustic performance of the product.

[0067] In a specific example, the second diaphragm is located above the first magnet 312, a fixing ring 25 is provided between the second diaphragm and the first magnet 312, the outer periphery of the second diaphragm is fixed to the fixing ring 25, and the inner periphery of the first diaphragm is fixed between the first magnet 312 and the fixing ring 25. The fixing ring 25 expands the distance between the second diaphragm and the first magnetic conductive plate 311, providing a deformation space for the second diaphragm to vibrate downward. In this embodiment, the first magnetic conductive plate 311 is not provided above the first magnet 312, so that the thickness of the product can be further reduced.

[0068] Furthermore, if Figure 7As shown, the first magnet 312 includes a first magnet 3121, a second magnet 3122 and a third magnet 3123 magnetized along the first direction, the second magnet 3122 and the third magnet 3123 are located on one side of the second voice coil 23 along the second direction, the first magnet 3121 is located on the other side of the second voice coil 23, and the third magnet 3123 is located on the side of the second magnet 3122 away from the first magnet 3121; the magnetization direction of the first magnet 3121 is opposite to the magnetization direction of the second magnet 3122 and the same as the magnetization direction of the third magnet 3123. The second magnet 314 includes a fourth magnet 3141 and a fifth magnet 3142 magnetized along the first direction and in the same magnetization direction, the fourth magnet 3141 and the fifth magnet 3142 are located on both sides of the second voice coil 23 along the second direction, and the magnetization directions of the first magnet 3121 and the fourth magnet 3141 are opposite.

[0069] The side magnetic circuit 32 includes a side magnet 322 and a side magnetic conductive plate 321 above the side magnet 322. The side magnetic conductive plate 321 and the second magnetic conductive plate 313 are spaced apart to form a first magnetic gap. The first voice coil 14 is at least partially inserted into the first magnetic gap. The magnetization direction of the side magnet 322 is parallel to and opposite to the magnetization direction of the fourth magnet 3141. The magnetic circuit system 30 also includes a yoke 33. The central magnetic circuit 31 and the side magnetic circuit 32 are both fixed on the same side of the yoke 33 to guide the magnetic lines of force and avoid magnetic leakage.

[0070] by Figure 7Taking the magnetizing direction as an example, the N poles of the first magnet 3121 and the third magnet 3123 face downward, and the N poles of the second magnet 3122, the fourth magnet 3141 and the fifth magnet 3142 face upward, and part of the magnetic lines of force of the first magnet 3121 and the fourth magnet 3141 pass through the lower driving edge of the second voice coil via the second magnetic conductive plate 313 on the left, and reach the second magnet 3122 via the second magnetic conductive plate 313 on the right, and then from the second magnet 3122, pass through the upper driving edge of the second voice coil and return to the first magnet 3121 (if the first magnetic conductive plate 311 is provided, the magnetic lines of force emitted from the second magnet 3122 pass through the first magnetic conductive plate 311 on the right, pass through the upper driving edge, and then return to the first magnet 3121 via the first magnetic conductive plate 311 on the left), forming a magnetic circuit, and the current directions of the upper driving edge and the lower driving edge of the second voice coil 23 are opposite, so the force directions of the upper and lower driving edges are the same, the resultant force is the maximum, and the driving force is large. Part of the magnetic force lines of the fourth magnet 3141 and the first magnet 3121 pass through the first voice coil 14 via the second magnetic conductive plate 313 on the left, and then pass to the left side magnet 322 via the side magnetic conductive plate 321 on the left, and return to the fourth magnet 3141 via the yoke 33, thus forming a magnetic circuit; the magnetic force lines of the third magnet 3123 and the fifth magnet 3142 pass through the first voice coil 14 via the second magnetic conductive plate 313 on the right, and then pass to the right side magnet 322 via the side magnetic conductive plate 321 on the right, and return to the fifth magnet 3142 via the yoke 33, thus forming a magnetic circuit. In the central magnetic circuit, magnets are provided on both the upper and lower sides of the second magnetic conductive plate 313. The magnetic force lines reaching the first voice coil 14 via the second magnetic conductive plate 313 are more numerous and denser, and the driving force is greater. The setting of the side magnetic circuit 32 can increase the magnetic field strength and enhance the driving force.

[0071] Furthermore, if Fig.11 As shown, the first magnet 312 also includes a sixth magnet 3124 and a seventh magnet 3125. The sixth magnet 3124 and the seventh magnet 3125 are distributed on both sides of the second voice coil 23 along the third direction. The first magnet 3121, the seventh magnet 3125, the third magnet 3123 and the sixth magnet 3124 are connected end to end, and together with the second magnet 3122, they form a through hole for the second voice coil 23 to be inserted.

[0072] Likewise, Fig.13 As shown, the second magnet 314 also includes an eighth magnet 3143 and a ninth magnet 3144, which are distributed on both sides of the second voice coil 23 along the third direction, and the fourth magnet 3141, the ninth magnet 3144, the fifth magnet 3142 and the eighth magnet 3143 are connected end to end to form a through hole, and the eighth magnet 3143 and the ninth magnet 3144 can further improve the magnetic field strength of the first magnetic gap. The side magnet 322 has four pieces, which are respectively arranged around the second magnet 314. In other embodiments, the side magnet 322 is an annular integrated structure for easy assembly.

[0073] The first magnet 3121 and the fourth magnet 3141 constitute the above-mentioned first magnetic component, the second magnet 3122, the third magnet 3123 and the fifth magnet 3142 constitute the above-mentioned second magnetic component, the sixth magnet 3124 and the eighth magnet 3143 constitute the third magnetic component, and the seventh magnet 3125 and the ninth magnet 3144 constitute the fourth magnetic component.

[0074] The second magnetic conductive plate 313 may be a split structure, corresponding to the first magnetic component, the second magnetic component, the third magnetic component, and the fourth magnetic component respectively; Fig.13 , Fig.14 As shown, the second magnetic conductive plate 313 may also be an integrated structure for easy assembly.

[0075] In one embodiment, Fig.14 As shown, the first magnet 3121, the third magnet 3123, the sixth magnet 3124 and the seventh magnet 3125 of the first magnet 312 are annular integrated structures, or the first magnet 312 is an integrated structure as a whole; the second magnet 314 is an integrated structure as a whole, which is convenient for assembly and has higher assembly accuracy. In another embodiment, the first magnet 3121 and the sixth magnet 3124 of the first magnet 312 are an integrated structure, the third magnet 3123 and the seventh magnet 3125 are an integrated structure, or the third magnet 3123, the second magnet 3122 and the seventh magnet 3125 are an integrated structure; similarly, the fourth magnet 3141 and the eighth magnet 3143 are an integrated structure, and the fifth magnet 3142 and the ninth magnet 3144 are an integrated structure. In yet another embodiment, as Fig.13 As shown, the first magnet 3121, the second magnet 3122, the third magnet 3123, the sixth magnet 3124 and the seventh magnet 3125 of the first magnet 312 are separate structures and are assembled separately, or the first magnet 3121, the third magnet 3123, the sixth magnet 3124 and the seventh magnet 3125 are separate structures and are assembled separately, and the second magnet 3122 and the third magnet 3123 are an integrated structure. That is, the separate and integrated structure descriptions of the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component mentioned above.

[0076] The sound-emitting unit of the utility model further comprises a shell 40 , which is fixed to the side magnetic conductive plate 321 , and the outer periphery of the first diaphragm is fixed to the shell 40 , which is convenient for assembly and provides a vibration space for the first diaphragm to vibrate downward.

[0077] In one embodiment, Fig.11 As shown, the edge of the first magnet 312 is rounded to prevent the first sound unit 10 from colliding with the first magnet 312 when vibrating; in another embodiment, as shown in FIG. Fig.12 As shown, the corner of the first magnet 312 is removed to form a missing corner 3127, which can save costs.

[0078] In a specific embodiment, the first diaphragm includes an annular first reinforcement portion 11, an annular first fold ring 12 and an annular second fold ring 13, the outer periphery and inner periphery of the first reinforcement portion 11 are respectively connected to the inner periphery of the first fold ring 12 and the outer periphery of the second fold ring 13, the first voice coil 14 is connected to the side of the first reinforcement portion 11 close to the first magnetic gap, the first reinforcement portion 11 is located between the first fold ring 12 and the second fold ring 13, the first fold ring 12 has a first outer fixing portion 122 and a first inner fixing portion 121, the second fold ring 13 has a second outer fixing portion 132 and a second inner fixing portion 131, the outer periphery of the first reinforcement portion 11 is connected to the first inner fixing portion 121, the inner periphery of the first reinforcement portion 11 is connected to the second outer fixing portion 132, the first outer fixing portion 122 is connected to the shell 40, the second sound unit 20 is covered on the second inner fixing portion 131, and the second inner fixing portion 131 is fixedly connected to the central magnetic circuit 31.

[0079] like Figure 3 , Figure 4 As shown, in some embodiments of the present invention, the sound unit further includes a centering support plate 15, one side of the centering support plate 15 is fixed to the housing 40, and the other side is connected to the end of the first voice coil 14 away from the first diaphragm to prevent the first sound unit 10 from polarizing when vibrating. There can be two centering support plates 15, which are respectively located at the two ends of the sound unit, or an integral structure, or four, which are respectively connected to the four corners of the first voice coil 14, and the present invention does not impose any restrictions on this. Furthermore, the centering support plate 15 is a conductive member, and a solder pad connected to the lead (not shown) of the first voice coil 14 is provided on the inner side, and a solder pad electrically connected to the external circuit is provided on the outer side. The centering support plate 15 not only prevents polarization but also realizes electrical connection, and is multi-purpose and highly integrated.

[0080] In one embodiment, the second diaphragm includes a second reinforcement portion 21 and a third fold ring 22, the second voice coil 23 is fixedly connected to the side of the second reinforcement portion 21 close to the second magnetic gap, the third fold ring 22 has a third outer fixing portion 222 and a third inner fixing portion 221, the third outer fixing portion 222 is fixed to the fixing ring 25 or the raised ring 3112, and the third inner fixing portion 221 is fixedly connected to the outer periphery of the second reinforcement portion 21, that is, the second reinforcement portion 21 is connected to the inner periphery of the third fold ring 22.

[0081] In another embodiment, if Fig.17 , Fig.18As shown, the second diaphragm is a single planar diaphragm 200 or a second reinforcement portion 21 is provided on the planar diaphragm 200, and the second voice coil 23 is fixedly connected to the single planar diaphragm 200 or the second reinforcement portion 21 on the planar diaphragm 200. The planar diaphragm 200 can be made of materials such as PEN and carbon paper, and the second reinforcement portion 21 can be made of carbon paper, aluminum composite materials, etc.

[0082] In one embodiment, Figure 7 As shown, one end of the first diaphragm close to the second diaphragm is fixed between the first magnetic conductive plate 311 and the first magnet 312. More specifically, a concave portion 3113 is provided on the outer periphery of the first magnetic conductive plate 311 and on the side close to the first magnet 312, and the second inner fixing portion 131 of the first diaphragm is located in the concave portion 3113, that is, the second inner fixing portion 131 is located between the first magnetic conductive plate 311 and the first magnet 312, and the second inner fixing portion 131 is bonded to the first magnetic conductive plate 311 and / or the first magnet 312. The concave portion 3113 can be made by pressing the outer periphery of the first magnetic conductive plate 311 thinly, or it can be obtained by removing the material. The fixing ring 25 or the raised ring 3112 is located above the outer periphery of the first magnetic conductive plate 311, so the third outer fixing portion 222 of the second diaphragm is bonded to the fixing ring 25 or the raised ring 3112, and the bonding surface of the third outer fixing portion 222 overlaps with the bonding surface of the second inner fixing portion 131 in the projection along the first direction. While ensuring that the edges of the first diaphragm and the second diaphragm have a wide bonding width, it is possible to achieve a high level of waterproofing without sacrificing the vibration radiation area, such as a waterproofing requirement of greater than or equal to 100 meters deep. In addition, when the vibration radiation area is the same, a smaller product volume can be obtained, which is conducive to miniaturization.

[0083] like Fig. 9 , Fig.10 , Fig.12 , Fig.15 , Fig.16 and Fig. 20As shown, in some embodiments of the present invention, the sound-emitting unit has an injection-molded portion 24 extending along a first direction, one end of the injection-molded portion 24 is fixed to a first magnetic conductive plate 311, the central magnetic circuit 31 has an avoidance portion 315 for accommodating the injection-molded portion 24, a limiting hole 331 is provided on the yoke 33, and the other end of the injection-molded portion 24 is fixed to the limiting hole 331. The electric connector 241 is embedded in the injection molding part 24. The two ends of the electric connector 241 have welding parts 2411. The first magnetic conductive plate 311 has an opening 3111 and a avoiding part 316 to expose the welding part 2411 close to the second diaphragm. The welding part 2411 close to the second diaphragm is connected to the lead 231 of the second voice coil 23. The avoiding part 316 is used to avoid the lead 231 of the second voice coil 23 to prevent the lead 231 from contacting the first magnetic conductive plate 311. The first magnet 312 also has a avoiding part 316 to prevent the lead 231 of the second voice coil 23 from contacting the first magnet 312 when the second sound unit 20 vibrates downward. The welding part 2411 at one end of the electric connector 241 away from the second diaphragm is exposed through the limiting hole 331 and connected to the welding part 51 on the circuit board 50.

[0084] Furthermore, the first magnetic conductive plate 311 has two openings 3111, two avoidance portions 316 and a gap. The two openings 3111 are respectively located at the two ends of the gap and on both sides of the gap, and the two openings 3111 are symmetrical about the center; the two avoidance portions 316 are respectively located at the two ends of the gap and on both sides of the gap, and the adjacent avoidance portions 316 and openings 3111 are respectively located on both sides of the gap. There are two injection molding parts 24, which correspond to the two openings 3111 respectively. The two injection molding parts 24 are symmetrical about the second voice coil 23, and the two injection molding parts 24 are respectively located on both sides of the second voice coil 23. The two leads 231 of the second voice coil 23 are respectively connected to the welding parts 2411 of the two electrical connectors 241 close to the second diaphragm.

[0085] Furthermore, the first magnet 312 , the second magnetic conductive plate 313 and the second magnet 314 each have two avoidance portions 315 and a gap. The two avoidance portions 315 are respectively located at the two ends of the gap and at both sides of the gap. The two avoidance portions 315 are centrally symmetrical.

[0086] When the first magnet 312 is a split structure, the first magnet 3121 has a avoidance portion 315 at one inner end and a avoidance portion 316 at the other inner end; the third magnet 3123 has a avoidance portion 315 at one inner end and a avoidance portion 316 at the other inner end; when the second magnet 314 is a split structure, the fourth magnet 3141 has a avoidance portion 315 at one inner end and a avoidance portion 315 at one inner end of the fifth magnet 3142; the avoidance portion 315 of the fourth magnet 3141 and the avoidance portion 315 of the fifth magnet 3142 are centrally symmetrical with respect to the second voice coil 23.

[0087] In the above, the two injection molding parts 24 are centrally symmetrical with respect to the second voice coil 23, the central magnetic circuit 31 has an avoidance part 315, and the injection molding part 24 is located in the avoidance part 315, so as to ensure that there is no interference with the second voice coil 23, prevent the second voice coil 23 from contacting the injection molding part 24, and ensure that there is a sufficient second magnetic gap on both sides of the second voice coil 23. The structural design of the injection molding part 24 facilitates the electrical connection of the lead 231 of the second voice coil 23, and at the same time, the external pads of the conductive part and the external pads of the circuit board 50 can be led out on the same side.

[0088] In one embodiment, Fig.16 As shown, a groove 332 is provided on one side of the yoke 33 away from the central magnetic circuit 31, and the circuit board 50 is at least partially fixed in the groove 332. Two limiting holes 331 are provided in the groove 332. The ends of the two injection molding parts 24 away from the second diaphragm are positioned through the two limiting holes 331, and the welding parts 2411 of the ends of the electrical connectors 241 in the two injection molding parts 24 away from the second diaphragm are exposed through the limiting holes 331. Two welding parts 51 are provided on the circuit board 50, and the two welding parts 51 are respectively located on both sides of the circuit board 50 and connected to the welding parts 2411. The thickness of the circuit board 50 is less than or equal to the depth of the groove 332, so as to protect the circuit board 50 and prevent external devices from causing bumps or wear on the circuit board 50.

[0089] In addition, the utility model discloses a sound module, such as Fig. 20 As shown, the sound module includes a shell 60 and the above-mentioned sound unit in the shell 60. The first sound unit 10 and the second sound unit 20 of the sound unit are located on the same side of the magnetic circuit system 30. The sounds emitted by the first sound unit 10 and the second sound unit 20 merge and are transmitted through the sound outlet of the sound module.

[0090] The utility model also discloses an electronic device, which includes the above-mentioned sound module, or includes the above-mentioned sound unit. The electronic device can be a smart phone, a tablet computer, a PC, a wearable device, a head-mounted device, etc.

[0091] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A sound-generating unit, comprising a first sound-generating unit, a second sound-generating unit and a magnetic circuit system, characterized in that: The first sound-emitting unit includes a first annular diaphragm and a first voice coil connected to the first diaphragm, the second sound-emitting unit includes a second diaphragm and a second voice coil connected to the second diaphragm, the second diaphragm is located at the inner periphery of the first diaphragm, and the first voice coil and the second voice coil both vibrate along a first direction; The magnetic circuit system comprises a central magnetic circuit and a side magnetic circuit located at the periphery of the central magnetic circuit, the central magnetic circuit and the side magnetic circuit are arranged at intervals, a first magnetic gap is formed between the central magnetic circuit and the side magnetic circuit, and a side of the first voice coil away from the first diaphragm is inserted into the first magnetic gap; The central magnetic circuit has a second magnetic gap, the second voice coil is a flat voice coil with an axis extending along a second direction perpendicular to the first direction, and a side of the second voice coil away from the second diaphragm is inserted into the second magnetic gap.

2. The sound-emitting unit according to claim 1, characterized in that: The central magnetic circuit has a through hole, and the through hole forms the second magnetic gap.

3. The sound-emitting unit according to claim 2, characterized in that: The central magnetic circuit has a first magnetic component, a second magnetic component, a third magnetic component and a fourth magnetic component. The first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component enclose the through hole. Along the second direction, the first magnetic component and the second magnetic component are located on both sides of the second voice coil. Along a third direction respectively perpendicular to the first direction and the second direction, the third magnetic component and the fourth magnetic component are located on both sides of the second voice coil.

4. The sound-emitting unit according to claim 3, characterized in that: The first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component are independent structures; Alternatively, the first magnetic component and the third magnetic component are integrally formed, and the second magnetic component and the fourth magnetic component are integrally formed; Alternatively, the first magnetic component, the second magnetic component, the third magnetic component and the fourth magnetic component are integrally formed.

5. The sound-emitting unit according to claim 1, characterized in that: The central magnetic circuit includes a first magnetic conductive plate, a first magnet, a second magnetic conductive plate and a second magnet which are sequentially stacked along the first direction, and the second diaphragm is arranged opposite to the first magnetic conductive plate.

6. The sound-emitting unit according to claim 5, characterized in that: The first magnetic conductive plate, the first magnet, the second magnetic conductive plate and the second magnet jointly define the second magnetic gap; Alternatively, the first magnetic conductive plate, the first magnet, and the second magnetic conductive plate jointly define the second magnetic gap, and the second magnetic gap is located on a side of the second magnet close to the second diaphragm.

7. The sound-emitting unit according to claim 1, characterized in that: The central magnetic circuit includes a first magnet, a second magnetic conductive plate, and a second magnet which are sequentially stacked along the first direction, and the second diaphragm is arranged opposite to the first magnet.

8. The sound-emitting unit according to claim 7, characterized in that: The first magnet, the second magnetic conductive plate and the second magnet jointly define the second magnetic gap; Alternatively, the first magnet and the second magnetic conductive plate jointly define the second magnetic gap, and the second magnetic gap is located on a side of the second magnet close to the second diaphragm.

9. The sound-emitting unit according to claim 5 or 7, characterized in that: The first magnet includes a first magnet, a second magnet and a third magnet magnetized along the first direction; along the second direction, the second magnet and the third magnet are located on one side of the second voice coil, the first magnet is located on the other side of the second voice coil, and the third magnet is located on a side of the second magnet away from the first magnet; the magnetization direction of the first magnet is opposite to that of the second magnet and is the same as that of the third magnet; The second magnet includes a fourth magnet and a fifth magnet which are magnetized along the first direction and have the same magnetization direction. Along the second direction, the fourth magnet and the fifth magnet are respectively located on both sides of the second voice coil. The magnetization directions of the first magnet and the fourth magnet are opposite.

10. The sound-emitting unit according to claim 1, characterized in that: The first diaphragm includes a first annular reinforcement portion, a first annular fold ring and a second annular fold ring, the outer periphery and inner periphery of the first reinforcement portion are respectively connected to the inner periphery of the first fold ring and the outer periphery of the second fold ring, and the first voice coil is connected to a side of the first reinforcement portion close to the first magnetic gap.

11. The sound-emitting unit according to any one of claims 1 to 8, characterized in that: The second diaphragm includes a second reinforcement portion and a third fold ring, the second voice coil is connected to a side of the second reinforcement portion close to the second magnetic gap, and the second reinforcement portion is connected to an inner periphery of the third fold ring; Alternatively, the second diaphragm is a planar diaphragm; Alternatively, the second diaphragm includes a planar diaphragm and a second reinforcement portion fixed on the planar diaphragm.

12. A sound module, characterized in that: The sound module includes a shell and a sound unit as described in any one of claims 1 to 11 located in the shell.

13. An electronic product, characterized in that: The electronic product includes the sound module as claimed in claim 12; Or, the electronic product includes the sound-emitting unit as described in any one of claims 1-11.

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